Factory efi

[Ed Wright]

Originally Posted by Lee Valentine

Was just talking about doing the retard points deal with someone this morning.

First I ever heard of it was from Jere Stahl. Then I bought the book by Bill Jenkins showing how to do it. He was flipping the retard switch with the shifter in his Vega.
The NHRA World Finals was held in Tulsa a few years. I saw a switch in Monster Mash that I assumed was for retard.
The Ronca Brothers had a ‘56, same combo as mine, but MUCH faster! Took the winds out of my sales. LOL 25 years old, and thought I was bad fast. Evidently I held the record because they let me. LOL Never had the nerve, and was too embarrassed, to talk to them.

[JRyan]

You should be able to create a secondary table to control the timing like that through Holley as well. Can’t remember off the top of my head what the actual terminology for the table is. But you can create a secondary table based off whatever input you’d like. Such as time or transbrake release etc. I just recently started messing with this on my turbo 275 car where I can pull extra timing down track if the track isn’t as good. Not saying the fast system isn’t great but for a relative newbie to efi I love the simplicity in Holleys system.

Rick Ryan

[GUMP]

What else you got Ed? 😎

[Ed Wright]

Originally Posted by GUMP

What else you got Ed? ��

Pardon?? Could you be more clear about what I’ve done?

[GUMP]

Originally Posted by Ed Wright

Pardon?? Could you be more clear about what I’ve done?

Ed,

You are a highly regarded member of this site. You are a smart guy and usually have very good points.

I feel that your comments in regard to Holley EFI lack sufficient supporting evidence.

I got my start with Accell Gen 6 DFI. I have had the old FAST, Accell Gen 7, and even stock ECMs. I currently have Holley on all my COPO cars. I have nothing bad to say about any of the systems I have run. At the time they were cutting edge or required by the class rules.

I have also never had an electronic failure in any of my cars. I am sure that I will have something happen at some point. Am I just really lucky? I don't think so. A lot of my time is spent installing modern electronics into older textile machines. There are good practices for installing electronics. The failures that I have witnessed in other peoples cars could be traced to a failure to respect those practices.

As an example. Never cable tie any part of your EFI system to any other battery source. The Holley installation requires that the power supply be "clean" all the way to the battery.

You have hit some good points lately. One is the idea of changing the timing on the shift. My old "Gump" Firebird has a first gear switch on the shifter for that purpose. I put it on there more than 20 years ago. The second is running smaller injectors. I have never had an issue running a smaller injector at a slightly higher pressure. In my experience they idle cleaner and have better throttle response. My 2012 COPO came from Chevrolet with 42 lb injectors at 90 PSI!!

No hard feelings here,

Daren

[Ed Wright]

After dialing my air/fuel numbers back to the same, 60 psi & smaller injectors was a solid 5 hundredths quicker. The reason I was given by the most knowledgeable guy I have ever known, was it reduces misfires, and promotes more complete combustion. We never hear all the misfires taking place all the time.
Larger injectors require much shorter pulse widths, at idle, light loads, and decel. When you get much below one mili second pulse widths, it gets inconsistent. My knowledgeable friend works for GM, doing the original calibrations (“tunes”) on Corvettes. Absolutely knows more about this than anybody here.