Factory efi

[cmracing]

Originally Posted by Ed Wright

One thing is something I was doing with my old Jr Stock ‘56. Running more timing in low & second gear. Something Jere Stahl put me onto over twenty years ago. I now run different timing in each gear. Easy 5 hundredths there. Jere told me he and Bill Jenkins had done that for years. Used to do it with our old dual point distributors & a toggle switch. “Turn on” the second set of points to retard the timing. I had re-drilled the breaker plate in my ‘56 Corvette distributor to move that one set of points to adjust the amount of retard. Spent most of a day on my Sun “distributor machine” working that deal out. Had the toggle switch mounted where my Hurst shifter tripped it going to high gear. I was much younger then, could usually remember to flip the switch back on the return road. LOL My FAST ECU does it all for me now. I do have a toggle switch now that shuts that function off, to help slow the car down when I don’t need it. The FAST XFI ECU can hold 5 “tunes”, I just use two.

You can do this with the Holley also. If you want to have multiple tunes inside the ECM to switch between you need the Dominator ECM. There is so much that can be done with the Holley that people just don't even know about.

[Fireofficer5]

OP. The factory ECM is great for Stock class cars. All you need is a hand heild tuner or a lap top programer.

[Ed Wright]

Originally Posted by Fireofficer5

OP. The factory ECM is great for Stock class cars. All you need is a hand heild tuner or a lap top programer.

Many factory ECUs don’t run well at higher RPM. Most GM stuff won’t trigger the injectors well past 7000 RPM. Not sure how high you need to spin your Stocker.
1996/1999 Vortec trucks hit that just barely past 6000.

[Ed Wright]

Originally Posted by cmracing

You can do this with the Holley also. If you want to have multiple tunes inside the ECM to switch between you need the Dominator ECM. There is so much that can be done with the Holley that people just don't even know about.

You can switch “tunes” at shifts, going down the track?

[cmracing]

Originally Posted by Ed Wright

You can switch “tunes” at shifts, going down the track?

You can modify your timing and fuel going down the track for each gear.

It seems a lot of people have their own opinions on this website and they are the final authority on all matters.

If you are hell-bent on running small injectors at higher than normal fuel pressure, go ahead. You can still run a large injector at higher fuel pressure and limit the pulse width, but you must already know this.

I come on here to help people, but I see you have it all covered. Robin Lawrence and I should just go-away and let people like you help the rest.........

Enjoy.

[Jeff Niceswanger]

Originally Posted by Ed Wright

I have tuned several with both FAST XFI & Holley. I would certainly disagree. I can & do make the FAST system do things the Holley can not. Besides the Holley ECU failures I have seen.

Most, in fact just about all the issues with the Holley is installation, and piss poor map set up. Actually its amazing how bad they can be and still run half way decent. Had a guy come over to our pits last summer and wanted me to look over his stuff. He said it ran fine, didn't miss or bog or anything, but the engine builder kept telling him he thought it should be faster. He says its a seven under car, he's happy with that, but lets have a look at it ..First thing I noticed was his data log showed crazy things going on with his TPS signal. And the better I adjusted the fuel map (which was a mess) the worse the signal got. I contacted Robin and he tells me a few areas to look at. Turns out, the units main voltage inputs did not go directly to the Battery. It was not set to the right parameters in the crank trigger settings. And the tune needed alot of work. We were both amazed when the car picked up THREE tenths. One solid tenth in 60 foot. Holleys are killer units, I think they have over 35 thousand of them out in service ( Right Robin?), but GIGO, Garbage In, Garbage Out, is absolutely the thing to watch on them....