| [GMCnet] Making a All GM EFI from scratch. Anyone else. [message #224733] |
Sun, 06 October 2013 20:28  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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I've been at a salvage yard lately. And I'm trying to figure out what to get the 7747 computer, and wiring out of. The 88, and 89 full size pick up isn't too bad to get these items out of. I'm going back Monday to finish a 88 Suburban. The GM 88 thru 91 Suburban, Blazer. and 1 ton retained the same body style as the 73 thru 87 full size pick up's. These seem to be simpler. I want the ignition system included with the EFI. If anyone out there is interested, or have some experience with this stuff. Contact me by e-mail, or phone. 319-521-4891 Iowa.
Bob Dunahugh78 Royale
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| Re: [GMCnet] Making a All GM EFI from scratch. Anyone else. [message #224810 is a reply to message #224733] |
Mon, 07 October 2013 18:38  |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Bob,
I pulled my harness from a full sized GMC van that had an EFI V8 in it. Look for the same years as the pickups with the 7747. The van harnesses are longer from engine to ECM, which should be located under the driver's seat. The extra harness length might help you with finding a good ECM location on your coach.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Oct 6, 2013, at 9:28 PM, Bob Dunahugh <yenko108@hotmail.com> wrote:
> I've been at a salvage yard lately. And I'm trying to figure out what to get the 7747 computer, and wiring out of. The 88, and 89 full size pick up isn't too bad to get these items out of. I'm going back Monday to finish a 88 Suburban. The GM 88 thru 91 Suburban, Blazer. and 1 ton retained the same body style as the 73 thru 87 full size pick up's. These seem to be simpler. I want the ignition system included with the EFI. If anyone out there is interested, or have some experience with this stuff. Contact me by e-mail, or phone. 319-521-4891 Iowa.
> Bob Dunahugh78 Royale
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> GMCnet mailing list
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Making a All GM EFI from scratch. Anyone else. [message #224859 is a reply to message #224733] |
Tue, 08 October 2013 10:51 |
Cadillackeeper
Messages: 464
Registered: October 2012
Location: Fort Lauderdale
Karma: 1
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I would advise against anything like that,May be cool/novel for 1/4 mile drag racing
but to drive cross country? The vendors can get you a good carb.Pour some gas in the top and drive home.No need for all this,in my opinion!!
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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| Re: [GMCnet] Making a All GM EFI from scratch. Anyone else. [message #224890 is a reply to message #224888] |
Tue, 08 October 2013 16:18 |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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Hi all,
I have had the Howell system now for about 10,000 miles. Maybe just a very
slight gas mileage improvement when towing but other than that no noticeable
difference. The biggest gain is from the drivability standpoint. The engine
starts first click either ice cold or freeway hot. No dieseling or run on.
No stalling and no vapor lock (although I use an efi pump and a booster
pump). I also installed the Electronic spark control and wide band sensor
with the Dynamics EBL but frankly once I worked through a bin setting my
engine liked I rarely use the laptop now. Did not use it at all in the
recent 2000 mile Coos Bay rally trip.
Prior to the EFI I had a perfectly good Qjet set up with a Paterson
distributor. It ran very well but did experience some run on and hot and
cold starting issues. Why does anyone in the GMC community make mods like
EFI or one ton front end, or dual air bags? Because we can. End of story.
There are probably thousands of GMC owners out there running bone stock set
ups and more power to them. Personally I like to tinker with stuff.
Thanks,
Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Sigmund Frankenfelter
Sent: Tuesday, October 08, 2013 2:00 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Making a All GM EFI from scratch. Anyone else.
When I was out looking to purchase a coach, I talked to and otherwise came
across a handful of people that had adapted fuel injection ( mostly throttle
body type).
I didn't find anyone who claimed any mileage or performance improvement over
carburetion. Granted, the sample was small, but add that experience to never
having heard, on this site or elsewhere that FI improves something, I
personally feel motivated to leave it be.
I am reasonably certain that the big improvements seen in modern engines are
because of fuel injection's designed in integration with other systems,
calibrated by on board computers.
I can't deny, though, that it would be nice if someone's project increased
power and got us 15 mpg _______________________________________________
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| Re: [GMCnet] Making a All GM EFI from scratch. Anyone else. [message #224922 is a reply to message #224859] |
Tue, 08 October 2013 22:55 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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| Cadillackeeper wrote on Tue, 08 October 2013 10:51 |
I would advise against anything like that,May be cool/novel for 1/4 mile drag racing
but to drive cross country? The vendors can get you a good carb.Pour some gas in the top and drive home.No need for all this,in my opinion!!
|
I spent a number of years working with the Qjet on my Cad 500 in a effort to make it run the way I wanted it to. Tried dead stock from a 73 eldo to an altitude compensating carb. Had some good success with it too. The trouble with it was that any changes involved taking the top of the carb off. Spent lots of time doing that, and went through a lot of carb top gaskets. Then I found a 76' EFI manifold and Russ Harms work on EFI. What topped it was Dynamic EFI's EBL P4 allowing the use of the 7730 computer. It has taken some time to work out the bugs, but I sure like the way it runs, and most of all I like the clean (meaning...no greasy hands) way of setting all aspects of the burn. For me the learning curve was steep, but now that I've got it pretty well dialed in, I'd never go back. Instant start, smooth idle, good power in all conditions, no run-on...etc...etc. Last week we are on the way home from the Branson rally. I look down at the EBL What's Up Display to see it suddenly go into PE (Power enrichment). I sense no change in engine performance, but the FA meter shows me suddenly running at 10/1 FA. I take my foot off the gas expecting to see it go to 99mpg...it goes to 11mpg. So I stop, and check the Malfunction codes. It shows a code 21 (TPS Throttle position sensor) error. I fire up and go to the nearest Autozone. Replace the TPS, and I'm back on the road hardly getting my hands dirty. Imagine this had happened on a carb...power valve sticks wide open. I wouldn't have even noticed the problem till I got home...if then...and in the mean time would have washed down the cylinders with the excess gas.
Just say'n...JMHO
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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