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[GMCnet] Fuel Injection [message #368288]

Sun, 02 January 2022 07:57

Hanson Email

Messages: 110
Registered: March 2020

Karma: -1

Senior Member

I know this is a can of worms I am opening, so feel free to pm me if you
like. I need to 'recommend' a system to a club member. Fi Tec, Howell, mid
70's throttle body, What?

Something that can be serviced on the road. Yes, it is a 1976 455 currently
registered out of Ca. But in Ca. Gas mileage is not the purpose, smooth
operation from sea to shining sea is with crossing the Sierras and Rockies
as well. Thanks in advance.

Dean Hanson

The Resourceful Norse.

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Re: [GMCnet] Fuel Injection [message #368290 is a reply to message #368288]

Sun, 02 January 2022 08:45

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

First, when you say "CA" I suspect you are meaning California? As a Canuck, CA is also the 2 letter short form for Canada.

So if you mean California, be sure his coach is exempt from Smog testing. If not, he must be prepared to re-install the carb and everything OEM each time before he can get it tested.

The aftermarket systems come in a nice full colour box with a nice set of instructions, but they are all proprietary for parts and service. The unit must be sent back to the manufacturer for any repairs. So you pretty much need to carry a second kit with you in case of a breakdown.

The Howell system uses GM sensors and ECM, but the throttle-body is a new Holley unit. The Howell units were great, until Holley reduced the size of the injectors from 80 pounds per hour (PPH) to 63PPH about 12 years ago. Unfortunately that is when I bought mine, and Howell didn't seem to know (or care). I spent a year trying to get it to work right. The EBL replaces the logic board in the GM ECU and makes it self learning and easy to program amoungst many other features. This solved all my Holley TB issues (except fuel flow at WOT, but I never go WOT). I eventually purchased a Rochester TB off a 454 engine so that fixed the small injector issue.

If I were to do it again, I would buy the EBL pre-installed in the 7747 ECM from dynamicefi.com . I would buy a Rochester TB off a 454 from eBay or a local junkyard. The sensors can be purchased new or from the junkyard. I would purchase the wiring harness from Affordable EFI or another source unless you are an electrician/electronics guy. The 455 olds programming for the EBL can be downloaded from the GMCMH-EFI google group.

This system uses (mostly) all GM parts available anywhere. There is lots of on-line support for it from other GMCer's who have been using it for years.

The EBL lets you add Electronic Spark Control (this really wakes up your engine!), Lean Cruise, Deceleration Fuel Cut Off and several other features.

Here is a very good presentation of EFI and how to build a GM system.
http://www.gmceast.com/technical/Swartzendruber_Generic_TBI_SlidesNotes.pdf

JWID

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: [GMCnet] Fuel Injection [message #368292 is a reply to message #368288]

Sun, 02 January 2022 10:19

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

I am in agreement with bruce.

The throttle body itself is only a small part
Of the puzzle. Howell, fi-tech, atimic, sniper, ect…. I feel most of the work and potential future problems are in how you do the fuel delivery.

The howell/dynamic ebl system is proven for decades now. There were people like bob drewes and others who were already running that before i owned my gmc in 2010.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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Re: [GMCnet] Fuel Injection [message #368294 is a reply to message #368288]

Sun, 02 January 2022 11:18

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

The Howell setup is probably the quickest 'one the road' parts system since itr's mostly GM parts.. It is also the most complex. The MSD Atomic is - or was anyway - CARB approved. I suspect if Holley can get the Sniper system CARB approved, they'll sunset the MSD, which they own. Herein GA anything as old as a GMC is exempt anyway.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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[GMCnet] Re: Fuel Injection [message #368298 is a reply to message #368294]

Sun, 02 January 2022 11:55

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

I believe anything 1976 and newer must be able to pass a smog inspection in California.

Larry Davick
Fremont, CA

> On Jan 2, 2022, at 9:18 AM, Johnny Bridges via Gmclist wrote:
>
> The Howell setup is probably the quickest 'one the road' parts system since itr's mostly GM parts.. It is also the most complex. The MSD Atomic is -
> or was anyway - CARB approved. I suspect if Holley can get the Sniper system CARB approved, they'll sunset the MSD, which they own. Herein GA
> anything as old as a GMC is exempt anyway.
>
> --johnny
>
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me in hell
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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Re: [GMCnet] Fuel Injection [message #368299 is a reply to message #368288]

Sun, 02 January 2022 12:21

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

My observation from MN(no smog, but see people posting and helping some through CA smog). Is it really depends on who smogs the gmc.

Msd is “carb compliant”. But not for a gmc motorhome application. Rare, but I know one gmc owner who had that issue and had to swap temp, back to carb to pass. Others have no issues.

I have seen that with many gmc owned. One passes smog no issue, the next finds somebody that wont pass it for the dumbest of reasons.

One thing about the gm based systems, is if the parts are not available locally(most are), They are available through the gmc community. I know even if my ecu dies, applied has them sitting on a shelf ready to ship. I also know owners who have spares. I do keep a spare gm ecu. It will let my coach start and move.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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[GMCnet] Re: Fuel Injection [message #368301 is a reply to message #368298]

Sun, 02 January 2022 12:37

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

I concur that the Howell system with EBL is probably at the top of the
heap, followed by the same system with the GM throttle body instead of the
Holley. There is a bunch of reasons, but availability of sensors and parts
has to be a big plus in it's favor. Do your homework, prepare your fuel
supply system correctly, and they are as reliable as an anvil.
Some of the other systems, Atomic is one of them, where parts are
scarce and hard to obtain on the road.
Sniper system has an awful lot going for it, particularly the
Quadrajet 4 barrel system. One thing that it does not have is a knock
sensor, but it does integrate with their ignition system to take advantage
of spark advance and altitude compensation.
But, this is my personal opinion. Take it as that, weigh the plusses
and minuses and place your money on the counter. Trust what Randy VanWinkle
says. Some of the other opinions are just that, same as mine.
Jim Hupy
Salem, Oregon

On Sun, Jan 2, 2022, 9:55 AM Larry Davick wrote:

> I believe anything 1976 and newer must be able to pass a smog inspection
> in California.
>
> Larry Davick
> Fremont, CA
>
>> On Jan 2, 2022, at 9:18 AM, Johnny Bridges via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> The Howell setup is probably the quickest 'one the road' parts system
> since itr's mostly GM parts.. It is also the most complex. The MSD Atomic
> is -
>> or was anyway - CARB approved. I suspect if Holley can get the Sniper
> system CARB approved, they'll sunset the MSD, which they own. Herein GA
>> anything as old as a GMC is exempt anyway.
>>
>> --johnny
>>
>> --
>> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
>> Braselton, Ga.
>> I forgive them all, save those who hurt the dogs. They must answer to
> me in hell
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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Re: [GMCnet] Fuel Injection [message #368302 is a reply to message #368299]

Sun, 02 January 2022 13:04

Bill Van Vlack

Messages: 419
Registered: September 2015
Location: Guemes Island, Washington

Karma: 14

Senior Member

I installed the GM throttle body with EBL as well, on the advice of several of fellow Cascaders that had/have been using it for years. Several others in the Cascaders have installed either FiTech or Holley and have had issues that had them swapping out the unit either temporarily to resolve a problem or to send the TB back to the supplier, or permanently out of disgust.

But these are anecdotal data points, and I'm sure there are many happy FiTech and Holley GMCers out there. For me, the difference between EFI and my twice rebuilt on the road QJ is substantial.
It does take more time to source and install the parts for a GM TB swap, and it's not necessarily less expensive - depending on what parts can be harvested.

Bill Van Vlack '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.

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[GMCnet] Re: Fuel Injection [message #368303 is a reply to message #368302]

Sun, 02 January 2022 13:14

johnd01

Messages: 354
Registered: July 2017
Location: Sacrameot

Karma: -1

Senior Member

Would the advice be significantly different if milage was a consideration?

On Sun, Jan 2, 2022 at 11:04 AM Bill Van Vlack
wrote:

> I installed the GM throttle body with EBL as well, on the advice of
> several of fellow Cascaders that had/have been using it for years. Several
> others
> in the Cascaders have installed either FiTech or Holley and have had
> issues that had them swapping out the unit either temporarily to resolve a
> problem or to send the TB back to the supplier, or permanently out of
> disgust.
>
> But these are anecdotal data points, and I'm sure there are many happy
> FiTech and Holley GMCers out there. For me, the difference between EFI and
> my
> twice rebuilt on the road QJ is substantial.
> It does take more time to source and install the parts for a GM TB swap,
> and it's not necessarily less expensive - depending on what parts can be
> harvested.
> --
> Bill Van Vlack
> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o
> mid
> November 2015.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

--

*John Phillips*
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Johnd01 John Phillips Avion A2600 TZE064V101164 Rancho Cordova, CA (Sacramento)

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[GMCnet] Re: Fuel Injection [message #368304 is a reply to message #368303]

Sun, 02 January 2022 13:45

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

Not in my case. I drive at the top end of the speed limit.
If I was concerned about fuel economy, I would never exceed 55 mph. I
would take off gently from a signal, or merge into traffic using the least
throttle opening opening possible, and drive like there was an inflated
balloon under the accelerator, have tires inflated to the maximum, reduce
all up weight of the coach as much as possible, etc. Might be good for a
couple of mpg.
But, I don't do all those things. I just pay the bill. Judy and I both
have separate fuel credit cards. We take turns buying gasoline. She has her
income, and I have mine. At the end of the year, when we compare gasoline
purchases, we are nearly always within a few dollars of each other. We
don't ever quibble about who spends the least or most.
But, a 2 barrel throttle body with 100 # per hour injectors will burn
plenty of fuel at wide open throttle. A 4 barrel throttle body, that
exactly fits the manifold, with much smaller injectors, will produce the
same horsepower levels at part throttle as the 2 barrel does at full
opening.
Human nature enters into the equation somewhere in this mix. If you
got it, the propensity is to use it. I wind up driving it like I stole it
most of the time. That does not equate to good fuel economy, no matter how
you slice it.
Your experience will vary.
Jim Hupy
Salem, Oregon

On Sun, Jan 2, 2022, 11:15 AM John Phillips
wrote:

> Would the advice be significantly different if milage was a consideration?
>
> On Sun, Jan 2, 2022 at 11:04 AM Bill Van Vlack
> wrote:
>
>> I installed the GM throttle body with EBL as well, on the advice of
>> several of fellow Cascaders that had/have been using it for years.
> Several
>> others
>> in the Cascaders have installed either FiTech or Holley and have had
>> issues that had them swapping out the unit either temporarily to resolve
> a
>> problem or to send the TB back to the supplier, or permanently out of
>> disgust.
>>
>> But these are anecdotal data points, and I'm sure there are many happy
>> FiTech and Holley GMCers out there. For me, the difference between EFI
> and
>> my
>> twice rebuilt on the road QJ is substantial.
>> It does take more time to source and install the parts for a GM TB swap,
>> and it's not necessarily less expensive - depending on what parts can be
>> harvested.
>> --
>> Bill Van Vlack
>> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
>> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner
> a/o
>> mid
>> November 2015.
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
>
> --
>
> *John Phillips*
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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[GMCnet] Re: Fuel Injection [message #368305 is a reply to message #368304]

Sun, 02 January 2022 14:51

GMCWiperMan

Messages: 1248
Registered: December 2007

Karma: 1

Senior Member

I faithfully record every mile, .1 gallon of gas and quart of oil I put in
the GMC, just like with the CRV. I don't think I've EVER calculated the
MPG. I know I haven't since installing the 500 Cad engine. Why would I?
I'm not likely to follow Jim H's recommendations to gain a couple of MPG.
That's sort of like the Lexus. It's the only car I've owned in the past 70
years without a mileage log -- why bother -- if I'm gonna drive it, why
sweat MPG?

JWID,

Ken H.

On Sun, Jan 2, 2022 at 2:45 PM James Hupy wrote:

> Not in my case. I drive at the top end of the speed limit.
> If I was concerned about fuel economy, I would never exceed 55 mph. I
> would take off gently from a signal, or merge into traffic using the least
> throttle opening opening possible, and drive like there was an inflated
> balloon under the accelerator, have tires inflated to the maximum, reduce
> all up weight of the coach as much as possible, etc. Might be good for a
> couple of mpg.
> But, I don't do all those things. I just pay the bill. Judy and I both
> have separate fuel credit cards. We take turns buying gasoline. She has her
> income, and I have mine. At the end of the year, when we compare gasoline
> purchases, we are nearly always within a few dollars of each other. We
> don't ever quibble about who spends the least or most.
> But, a 2 barrel throttle body with 100 # per hour injectors will burn
> plenty of fuel at wide open throttle. A 4 barrel throttle body, that
> exactly fits the manifold, with much smaller injectors, will produce the
> same horsepower levels at part throttle as the 2 barrel does at full
> opening.
> Human nature enters into the equation somewhere in this mix. If you
> got it, the propensity is to use it. I wind up driving it like I stole it
> most of the time. That does not equate to good fuel economy, no matter how
> you slice it.
> Your experience will vary.
> Jim Hupy
> Salem, Oregon
>
> On Sun, Jan 2, 2022, 11:15 AM John Phillips
> wrote:
>
>> Would the advice be significantly different if milage was a
> consideration?
>>
>> On Sun, Jan 2, 2022 at 11:04 AM Bill Van Vlack >
>> wrote:
>>
>>> I installed the GM throttle body with EBL as well, on the advice of
>>> several of fellow Cascaders that had/have been using it for years.
>> Several
>>> others
>>> in the Cascaders have installed either FiTech or Holley and have had
>>> issues that had them swapping out the unit either temporarily to
> resolve
>> a
>>> problem or to send the TB back to the supplier, or permanently out of
>>> disgust.
>>>
>>> But these are anecdotal data points, and I'm sure there are many happy
>>> FiTech and Holley GMCers out there. For me, the difference between EFI
>> and
>>> my
>>> twice rebuilt on the road QJ is substantial.
>>> It does take more time to source and install the parts for a GM TB
> swap,
>>> and it's not necessarily less expensive - depending on what parts can
> be
>>> harvested.
>>> --
>>> Bill Van Vlack
>>> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
>>> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner
>> a/o
>>> mid
>>> November 2015.
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>>
>>
>> --
>>
>> *John Phillips*
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
> _______________________________________________
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>
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Re: [GMCnet] Fuel Injection [message #368306 is a reply to message #368288]

Sun, 02 January 2022 15:41

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma: 12

Senior Member

Aftermarket EFI—- when you absolutely positively don’t have to be there. I only became a shoulder dweller as a non operative coach one time. Side of interstate in a rain storm with every semi whizzing by rocking the boat. This was about an hour into my madden voyage home as the PO told me the tanks were full when they were in fact empty. I never want to be in that situation again, and good maintenance has proven to have paid off in the past 14 plus years. Reading aftermarket EFI posts with dead on the road events, it just isn’t something that fits my criteria for a occasionally used vehicle. The only way I would do it is will all GM parts, and a spread bore throttle body to match our spread bore manifold. But that does not exist AFAIK, but I have not researched. Holley has spread bore but they have the most horror story reports. My Qjet cold start and warm up is so flawless, I wouldn’t change. Keep us posted if you find something.

John Lebetski
Woodstock, IL
77 Eleganza II

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Re: [GMCnet] Fuel Injection [message #368307 is a reply to message #368288]

Sun, 02 January 2022 15:58

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

Current coach was a Ca coach, came with the MSD ATomic setup. Runs flawlessly, starts flawlessly. Previous (23') had a correctly built Qjet, took a bit longer to start till I added two electric pumps and blank flanged the mechanical pump mount. Turn the key to run, count to five slowly, started flawlessly, ran flawlessly. Once with the 23' specifically trying for mileage, got just at 145MPG, Asheville home, freeway the entire way Sunday noon downhill all the way, 55 per. Who's gonna driven it like that anyway? 26 foot does 9 and a bit running 65 bobtailed, slightly under nine with the toad on the back, no difference 92 Jetta or 2012 Kia Soul. Haven't logged the John Beaver motor, it may do a bit better.
I say Asheville, actually Fletcher NC but unless you live there or show dogs you prolly don't know where it is.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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Re: [GMCnet] Re: Fuel Injection [message #368308 is a reply to message #368303]

Sun, 02 January 2022 16:19

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

Mpg really needs to be removed from the decision tree on efi.

Yes some can say they have better mpg with efi, but is so dependent on so many other factors. I know people who are getting worse mpg with efi too.

I believe the spark control that the ebl has ability to tune in can achieve the best mpg increase, but it is so notnworth considering because that can easily be lost by hitting some hills, stop/go driving. Or hooking up a heavy toad. I probably get less mpg then most just because of driving habits and our freeway speed is 75 mph around here and 80mph just
To
My west.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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[GMCnet] Re: Fuel Injection [message #368309 is a reply to message #368306]

Sun, 02 January 2022 16:06

CJV

Messages: 49
Registered: December 2021

Karma: 1

Member

Very interested in following this thread......

CJ Vermeulen, Scribbler

----- Original Message -----
From: "John R. Lebetski"
To: "gmclist"
Sent: Sunday, January 2, 2022 3:41:25 PM
Subject: [GMCnet] Re: Fuel Injection

Aftermarket EFI—- when you absolutely positively don’t have to be there. I only became a shoulder dweller as a non operative coach one time. Side
of interstate in a rain storm with every semi whizzing by rocking the boat. This was about an hour into my madden voyage home as the PO told me the
tanks were full when they were in fact empty. I never want to be in that situation again, and good maintenance has proven to have paid off in the
past 14 plus years. Reading aftermarket EFI posts with dead on the road events, it just isn’t something that fits my criteria for a occasionally
used vehicle. The only way I would do it is will all GM parts, and a spread bore throttle body to match our spread bore manifold. But that does not
exist AFAIK, but I have not researched. Holley has spread bore but they have the most horror story reports. My Qjet cold start and warm up is so
flawless, I wouldn’t change. Keep us posted if you find something.
--
John Lebetski
Woodstock, IL
77 Eleganza II
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Re: [GMCnet] Fuel Injection [message #368311 is a reply to message #368288]

Sun, 02 January 2022 17:45

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

Add a Vehicle Speed Sensor (VSS) to your EBL and then you can enable Lean Cruise and Deceleration fuel cutoff (DFCO). Then you can watch the Instant MPG goto ~14MPG on lean Cruise and 99MPG going down a hill with DFCO.

I usually run with the truckers here in Canada. So in Ontario on the freeways they are required to run speed limiters at 105Kph max. I've seen 12MPG average (US Gallons) on the EBL (which calculated pretty close on 2 fill-ups). This was only highway running at a constant speed.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: [GMCnet] Fuel Injection [message #368315 is a reply to message #368311]

Sun, 02 January 2022 19:45

Bill Van Vlack

Messages: 419
Registered: September 2015
Location: Guemes Island, Washington

Karma: 14

Senior Member

RF_Burns wrote on Sun, 02 January 2022 17:45

Add a Vehicle Speed Sensor (VSS) to your EBL and then you can enable Lean Cruise and Deceleration fuel cutoff (DFCO). Then you can watch the Instant MPG goto ~14MPG on lean Cruise and 99MPG going down a hill with DFCO.

I usually run with the truckers here in Canada. So in Ontario on the freeways they are required to run speed limiters at 105Kph max. I've seen 12MPG average (US Gallons) on the EBL (which calculated pretty close on 2 fill-ups). This was only highway running at a constant speed.

Use WinLog-EBL and you can use the three trip meters that record miles, gallons, and mpg. There's a new installer on the website that makes it much easier to set up.

Bill Van Vlack '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.

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[GMCnet] Re: Fuel Injection [message #368321 is a reply to message #368315]

Sun, 02 January 2022 23:05

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

All the throttle body EFI has no Full ignition timing control so don't
expect better mileage.
Without full Ignition timing control, you're dependent on the
original distributor with vacuum and mechanical advance.
We sell ALL the kits and find that the Howell base unit with Knock module
and knock sensor and the EBL Flash drive ECM will deliver better mileage.
Best of all, 90% of the components are readily tors.at your parts store,
while ALL the other throttle body unit are seldom stocked by local parts
distributors.
Keep in mind, your using the MH traveling out of town.

On Sun, Jan 2, 2022 at 5:45 PM Bill Van Vlack
wrote:

> RF_Burns wrote on Sun, 02 January 2022 17:45
>> Add a Vehicle Speed Sensor (VSS) to your EBL and then you can enable
> Lean Cruise and Deceleration fuel cutoff (DFCO). Then you can watch the
>> Instant MPG goto ~14MPG on lean Cruise and 99MPG going down a hill with
> DFCO.
>>
>> I usually run with the truckers here in Canada. So in Ontario on the
> freeways they are required to run speed limiters at 105Kph max. I've seen
>> 12MPG average (US Gallons) on the EBL (which calculated pretty close on
> 2 fill-ups). This was only highway running at a constant speed.
>
> Use WinLog-EBL and you can use the three trip meters that record miles,
> gallons, and mpg. There's a new installer on the website that makes it much
> easier to set up.
>
> --
> Bill Van Vlack
> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o
> mid
> November 2015.
> _______________________________________________
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Re: [GMCnet] Re: Fuel Injection [message #368328 is a reply to message #368305]

Mon, 03 January 2022 08:38

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

GMCWiperMan wrote on Sun, 02 January 2022 15:51

I faithfully record every mile, .1 gallon of gas and quart of oil I put in the GMC, just like with the CRV. I don't think I've EVER calculated the MPG. I know I haven't since installing the 500 Cad engine. Why would I?
I'm not likely to follow Jim H's recommendations to gain a couple of MPG.
That's sort of like the Lexus. It's the only car I've owned in the past 70 years without a mileage log -- why bother -- if I'm gonna drive it, why sweat MPG?

JWID,

Ken H.

I am one of those that track fuel and oil consumption with great regularity and care.
Do I do this to record the cost?
No!
I do it to both know what I can expect from my fuel inventory and the overall condition of the main engine.

Early in the coach time, I also used to log the alcohol content of the fuel as purchased. That proved what I already knew from years in engine labs. The alcohol is in there just to buy it from farmers (actually ADM) and it more soluble in gasoline than are corn flakes.

A few years back, we broke a piston, when the lube oil consumption went from less than a quart in 2K to more than a quart in 500, I was absolutely certain that there was a problem that needed attention.

After I got it put back together with lots of changes like a cam and blocked manifold heat, I was very concerned to know what the new fuel rate was. Well, it has dropped right back in the groove at 9.2. This makes predicting required fuel stops way simpler. So, this is not just a habit left over from years of taking care of other people's engines or flying little airplanes, it is a very functional thing to do. If you take the time to write the odometer number on the slip the gas pump spits out, it is real easy to do when you get around to it...

Matt - Staying inside until the day warms up

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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[GMCnet] Re: Fuel Injection [message #368343 is a reply to message #368328]

Tue, 04 January 2022 08:38

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

James Hupy said:
" If I was concerned about fuel economy, I would... "

If anyone is really concerned about fuel economy, they wouldn't be driving a motorhome!

To me the choice is to drive a compact car to a hotel in the city v drive a cool ol coach and camp in a beautiful campground while still having all the comforts of home. The GMC is nice, cheap, maintainable cool and small. The only thing smaller is a van, but they arn't cheaper or better.

Keith Vasilakes
Mounds View MN
76 exRoyale
MicroLevel

________________________________
From: Matt Colie
Sent: Monday, January 3, 2022 8:38 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Fuel Injection

GMCWiperMan wrote on Sun, 02 January 2022 15:51
> I faithfully record every mile, .1 gallon of gas and quart of oil I put in the GMC, just like with the CRV. I don't think I've EVER calculated
> the MPG. I know I haven't since installing the 500 Cad engine. Why would I?
> I'm not likely to follow Jim H's recommendations to gain a couple of MPG.
> That's sort of like the Lexus. It's the only car I've owned in the past 70 years without a mileage log -- why bother -- if I'm gonna drive it,
> why sweat MPG?
>
> JWID,
>
> Ken H.

I am one of those that track fuel and oil consumption with great regularity and care.
Do I do this to record the cost?
No!
I do it to both know what I can expect from my fuel inventory and the overall condition of the main engine.

Early in the coach time, I also used to log the alcohol content of the fuel as purchased. That proved what I already knew from years in engine labs.
The alcohol is in there just to buy it from farmers (actually ADM) and it more soluble in gasoline than are corn flakes.

A few years back, we broke a piston, when the lube oil consumption went from less than a quart in 2K to more than a quart in 500, I was absolutely
certain that there was a problem that needed attention.

After I got it put back together with lots of changes like a cam and blocked manifold heat, I was very concerned to know what the new fuel rate was.
Well, it has dropped right back in the groove at 9.2. This makes predicting required fuel stops way simpler. So, this is not just a habit left over
from years of taking care of other people's engines or flying little airplanes, it is a very functional thing to do. If you take the time to write
the odometer number on the slip the gas pump spits out, it is real easy to do when you get around to it...

Matt - Staying inside until the day warms up
--
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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_______________________________________________
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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