Home » Public Forums » GMCnet » [GMCnet] Injection versus Carbs
[GMCnet] Injection versus Carbs [message #73254] |
Mon, 08 February 2010 10:01 |
Richard Lister
Messages: 56 Registered: November 2009
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Hi. I'm hoping to be in the market for a GMC in the next couple of months and wondered what thoughts you may have about TBI. Having owned and maintained a'67 Corvette for a few years, I know that I am never going to be gifted in the tuning department... Also, if I am lucky enough to be able to get a GMC it will be used immediately for a road trip of a couple of months at a range of altitudes and temperatures, so TBI would seem to make sense.
So, here's the question; is there a downside to getting a coach with TBI - or having it fitted?
Thanks in advance
Richard
No GMC yet, but fingers crossed...
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Re: [GMCnet] Injection versus Carbs [message #73256 is a reply to message #73254] |
Mon, 08 February 2010 10:10 |
Mr ERFisher
Messages: 7117 Registered: August 2005
Karma: 2
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you will get lots of input on this but here are my reasons ( read "my
reasons)
http://gmcmotorhome.info/howell.html
I now have 2 (yes 2) GMCs , with stock Howell's, and I would have it no
other way
gene
On Mon, Feb 8, 2010 at 8:01 AM, Richard Lister <reliste@yahoo.com> wrote:
> Hi. I'm hoping to be in the market for a GMC in the next couple of months
> and wondered what thoughts you may have about TBI. Having owned and
> maintained a'67 Corvette for a few years, I know that I am never going to be
> gifted in the tuning department... Also, if I am lucky enough to be able to
> get a GMC it will be used immediately for a road trip of a couple of months
> at a range of altitudes and temperatures, so TBI would seem to make sense.
>
> So, here's the question; is there a downside to getting a coach with TBI -
> or having it fitted?
>
> Thanks in advance
> Richard
> No GMC yet, but fingers crossed...
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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Re: [GMCnet] Injection versus Carbs [message #73258 is a reply to message #73254] |
Mon, 08 February 2010 10:17 |
GeorgeRud
Messages: 1380 Registered: February 2007 Location: Chicago, IL
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There are definitely two camps on this. A properly setup Quadrajet does a fine job and is pretty bulletproof, but the EFI is certainly a more up-to-date setup. The problem becomes "what happens if something goes south?", who can fix it? A carb can usually limp you home somehow, whereas the EFI system usually requires a tow into a service facility.
I have the carb on my couch, and it seems to work just fine. But, as more and more technicians come along that have never seen a carb, the EFI may seem like the more logical choice. You can get many opinions on this issue! Jim Bounds at the GMC Coop is in the Carb Camp, others swear by the EFI as the only way to go. Neither setup will give you 15 mpg if that's what you're looking for.
George Rudawsky
Chicago, IL
75 Palm Beach
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Re: [GMCnet] Injection versus Carbs [message #73264 is a reply to message #73258] |
Mon, 08 February 2010 11:08 |
Ron
Messages: 250 Registered: February 2004 Location: Conifer, Colorado
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Richard..
I live at 9200 feet of elevation.. I have a 76 Eleganza that runs really well.. BUT, I am changing over to a Fuel injector for the main reason being altitude compensation.. My coach runs very well but low on vacuum and rich.. It is not unusual for me to run less than 6 inches of vacuum at high altitudes at relatively flat running so I am into the power enrichment all the time.. Don't even ask about fuel mileage under those conditions..
I am going all the way with a Howell injector. I am adding a knock sensor, An electronic spark control distributor and a Vehicle speed sensor. I also am installing one of EBL's Flash boards to ease the "learning" capabilities of the ECM..
Just mu .02
Ron
now a P.O.
Conifer, CO
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Re: [GMCnet] Injection versus Carbs [message #73267 is a reply to message #73254] |
Mon, 08 February 2010 11:14 |
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Matt Colie
Messages: 8547 Registered: March 2007 Location: S.E. Michigan
Karma: 7
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Richard Lister wrote on Mon, 08 February 2010 11:01 | Hi. I'm hoping to be in the market for a GMC in the next couple of months and wondered what thoughts you may have about TBI. Having owned and maintained a'67 Corvette for a few years, I know that I am never going to be gifted in the tuning department... Also, if I am lucky enough to be able to get a GMC it will be used immediately for a road trip of a couple of months at a range of altitudes and temperatures, so TBI would seem to make sense.
So, here's the question; is there a downside to getting a coach with TBI - or having it fitted?
Thanks in advance
Richard
No GMC yet, but fingers crossed...
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Richard,
There are more than a few nice GMCs out there and available, but the penetration of electronic fuel injection as an upgrade is not real high. See if you can find one with and one without before you try to use that as a selection issue.
Even then, there is the Howell, Holly, Megasquirt and transplant sources that are all considerations.
Good Luck and tell us what you find.
Matt
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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Re: [GMCnet] Injection versus Carbs [message #73269 is a reply to message #73254] |
Mon, 08 February 2010 12:25 |
Steven Ferguson
Messages: 3447 Registered: May 2006
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Senior Member |
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I am Gene's evil twin. I love my Qjet and wouldn't have it any other way.
On Mon, Feb 8, 2010 at 9:01 AM, Richard Lister <reliste@yahoo.com> wrote:
> Hi. I'm hoping to be in the market for a GMC in the next couple of months and wondered what thoughts you may have about TBI. Having owned and maintained a'67 Corvette for a few years, I know that I am never going to be gifted in the tuning department... Also, if I am lucky enough to be able to get a GMC it will be used immediately for a road trip of a couple of months at a range of altitudes and temperatures, so TBI would seem to make sense.
>
> So, here's the question; is there a downside to getting a coach with TBI - or having it fitted?
>
> Thanks in advance
> Richard
> No GMC yet, but fingers crossed...
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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Re: [GMCnet] Injection versus Carbs [message #73270 is a reply to message #73269] |
Mon, 08 February 2010 12:35 |
k2gkk
Messages: 4452 Registered: November 2009
Karma: -8
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Senior Member |
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I can't tell you how many folks over the years have told
me that there are two sorts of Quadrajet carbs. They are
either great or terrible; no in-between whatsoever. If
you have one that has given good service, but seems to have
been dropping off in performance a bit, find a competent
rebuilder to REBUILD your core. If it has virtually always
been a PITA, swap your core off at a rebuilder and hope that
you end up with one that is a whole bunch better!
It has also long been said about virtually all carburetors,
that the longer you can keep a mechanic away from it, the
better your life and happiness will be.
Mac Macdonald
Oklahoma City
----------------------------------------
Date: Mon, 8 Feb 2010 11:25:00 -0700
From: botiemad11@gmail.com
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Injection versus Carbs
I am Gene's evil twin. I love my Qjet and wouldn't have it any other way.
_________________ORIGINAL MESSAGE ___________________
On Mon, Feb 8, 2010 at 9:01 AM, Richard Lister wrote:
Hi. I'm hoping to be in the market for a GMC in the next couple of
months and wondered what thoughts you may have about TBI. Having
owned and maintained a'67 Corvette for a few years, I know that I
am never going to be gifted in the tuning department...
Also, if I am lucky enough to be able to get a GMC it will be used
immediately for a road trip of a couple of months at a range of
altitudes and temperatures, so TBI would seem to make sense.
So, here's the question; is there a downside to getting a coach
with TBI - or having it fitted?
Thanks in advance
Richard
No GMC yet, but fingers crossed...
______________END OF ORIGINAL MESSAGE___________________
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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Re: [GMCnet] Injection versus Carbs [message #73271 is a reply to message #73269] |
Mon, 08 February 2010 12:46 |
Mr ERFisher
Messages: 7117 Registered: August 2005
Karma: 2
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Senior Member |
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what is your SOB running? ;>)
gene
I am Gene's evil twin. I love my Qjet and wouldn't have it any other way.
>
> On Mon, Feb 8, 2010 at 9:01 AM, Richard Lister <reliste@yahoo.com> wrote:
> > Hi. I'm hoping to be in the market for a GMC in the next couple of months
> and wondered what thoughts you may have about TBI. Having owned and
> maintained a'67 Corvette for a few years, I know that I am never going to be
> gifted in the tuning department... Also, if I am lucky enough to be able to
> get a GMC it will be used immediately for a road trip of a couple of months
> at a range of altitudes and temperatures, so TBI would seem to make sense.
> >
> > So, here's the question; is there a downside to getting a coach with TBI
> - or having it fitted?
> >
> > Thanks in advance
> > Richard
> > No GMC yet, but fingers crossed...
> >
> >
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Steve Ferguson
> '76 EII
> Sierra Vista, AZ
> Urethane bushing source
> www.bdub.net/ferguson/
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Re: [GMCnet] Injection versus Carbs [message #73272 is a reply to message #73254] |
Mon, 08 February 2010 13:11 |
bill schurman
Messages: 97 Registered: February 2004
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I live in the Colorado mountains and I have NO power with a carb (Dick Paterson rebuild). If I had the $$ I'd go with a TBI.
Bill Schurman
1978 Palm Beach TZE168V100258
Steamboat Springs, CO
at the base of "Rabbit Ears Pass"
With a 7% grade
--- mr.erfisher@gmail.com wrote:
From: "Mr.erf ERFisher" <mr.erfisher@gmail.com>
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Injection versus Carbs
Date: Mon, 8 Feb 2010 10:46:28 -0800
what is your SOB running? ;>)
gene
I am Gene's evil twin. I love my Qjet and wouldn't have it any other way.
>
> On Mon, Feb 8, 2010 at 9:01 AM, Richard Lister <reliste@yahoo.com> wrote:
> > Hi. I'm hoping to be in the market for a GMC in the next couple of months
> and wondered what thoughts you may have about TBI. Having owned and
> maintained a'67 Corvette for a few years, I know that I am never going to be
> gifted in the tuning department... Also, if I am lucky enough to be able to
> get a GMC it will be used immediately for a road trip of a couple of months
> at a range of altitudes and temperatures, so TBI would seem to make sense.
> >
> > So, here's the question; is there a downside to getting a coach with TBI
> - or having it fitted?
> >
> > Thanks in advance
> > Richard
> > No GMC yet, but fingers crossed...
> >
> >
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Steve Ferguson
> '76 EII
> Sierra Vista, AZ
> Urethane bushing source
> www.bdub.net/ferguson/
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Re: [GMCnet] Injection versus Carbs [message #73285 is a reply to message #73254] |
Mon, 08 February 2010 16:23 |
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USAussie
Messages: 15912 Registered: July 2007 Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
As you can see from the signature line I have two GMC's; the one in the USA
has a Paterson Q-Jet and the one in Australia has a Holley Commander four
barrel fuel injection system on an Edelbrock manifold.
I do not know what the fuel mileage is on either one as I have never checked
either, however, I do know that the FI one here goes like a "shower of s#%t"
(that's Aussie for "raped Ape)." ;-)
One thing that I have noted is that there have been a lot of discussions
about a slight hesitation when first applying the gas on the GMCnet. The
Holley does not have that problem AT ALL.
Unfortunately I can't provide any more info on the system or how to tune it
as it was installed by the PO. I do have a spare Q-jet with me just in case
the Holley dies.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Richard Lister
Sent: Tuesday, 9 February 2010 3:01 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Injection versus Carbs
Hi. I'm hoping to be in the market for a GMC in the next couple of months
and wondered what thoughts you may have about TBI. Having owned and
maintained a'67 Corvette for a few years, I know that I am never going to be
gifted in the tuning department... Also, if I am lucky enough to be able to
get a GMC it will be used immediately for a road trip of a couple of months
at a range of altitudes and temperatures, so TBI would seem to make sense.
So, here's the question; is there a downside to getting a coach with TBI -
or having it fitted?
Thanks in advance
Richard
No GMC yet, but fingers crossed...
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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Re: [GMCnet] Injection versus Carbs [message #73295 is a reply to message #73254] |
Mon, 08 February 2010 18:45 |
Rick Williams
Messages: 256 Registered: July 2004
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Senior Member |
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Richard
Carbs vs FI is always a good discussion and it is important information. But it should not influence you in your selection of a coach. If you had two coaches that had what you were looking for, except one had a carb and the other an FI, then it would enter into your decision. But that may not happen. So find the right coach and if it has a carb, you can always "upgrade" to FI or "downgrade" to a carb. Or is it the other way around? I can never remember. I put this far down on the list of requirements when selecting a coach.
Good luck with your search and ask plenty of questions. You might consider putting your location with your signature. That will prompt people to tell you about coaches they know of in your area.
Rick
Rick Williams
Bliss, Michigan
1978 Eleganza II
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Re: [GMCnet] Injection versus Carbs [message #73300 is a reply to message #73254] |
Mon, 08 February 2010 20:14 |
George Beckman
Messages: 1085 Registered: October 2008 Location: Colfax, CA
Karma: 11
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Senior Member |
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Richard Lister wrote on Mon, 08 February 2010 08:01 | Hi.
So, here's the question; is there a downside to getting a coach with TBI - or having it fitted?
Thanks in advance
Richard
No GMC yet, but fingers crossed...
|
Richard,
You did not mention your state. If you are in California, and want a TBI on a coach newer than '75 they really don't like it. They really, really don't like it. CA will make you put the quadrajet back on to make more smog so you can pass smog.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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