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Re: [GMCnet] Fuel Injection [message #368290 is a reply to message #368288] Sun, 02 January 2022 08:45 Go to previous messageGo to previous message
RF_Burns is currently offline  RF_Burns   Canada
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma:
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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