My combination of american horsepower and a jap car(see signature) have led me here for answers. I hope I'm welcome :-). I'm kinda assuming that with the combo I have, an off the shelf PROM would be useless. Anyone disagree? I don't have to run a cat, the car weighs around 2500 lbs., 3.54 diff., etc. All these things have me seriously thinking about trying to learn to program myself.
Anybody think I'm nuts yet?? :-)
Suggestions, comments, anyone??....

Anyway, I do have one silly question that's bugging me - is the final drive ratio
adjusted in the PROM or the VSS buffer?
I hit the speed limiter (when it's not switched off :-) ) at 82 mph with the final drive and tire size I have.
Thanks in advance, Jeff


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'71 Datsun 240Z
'91 Camaro TBI 305 drivetrain
Build it, Drive it, Improve it...

 

I would certainly think you are welcome. The VSS buffer is what handles the final drive ratio. I can't tell you how to modify it to accomdate your new axle ratio.

 

double post.....

[This message has been edited by Brent (edited September 27, 2000).]

 

Unlike the newer Flash ECMs the old 730s, 165s, 747s, etc do not have a way to modify the actual drive ratio to compensate for different gear ratios ... at least not to my knowledge. If someone here knows differently please post Anyhow - in order to compensate for the 3.73s in my car I had to swap speedo gears in the tranny.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.587 @ 107.97mph (1.710 60ftr) on the long runner setup.
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels. Stock Wheels. No Weight Reduction.
Gunning for NA 11's with the MiniRam II and Hooker LT Headers.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org