[s-cars] 80tq: 20v Project Update, 415whp, 12.25, etc

[JShadzi at aol.com]

Hap, if you don't mind me ruminating about your dyno experience...if I remember correctly, by 4krpm your fuel curve was plunging below 10:1, going off the chart rich, then coming back lean around 6krpm and ending up dangerously lean at about 13.5:1 by 7krpm ish.

Due to the "Happersized" fuel pressure gauge (of which I'm now running ;)  we could easily observe fuel pressure hitting 90psi (insanely high) and by 6krpm begin to rapidly drop correlating to the leaning fuel curve.

Clearly there were some mapping problems aggrivated by more fuel delivery than what the system was accustomed to.

I think a good solution to your fuel pressure problem would have been bigger injectors and a lowering of your fuel pressure.  There aren't many factory EFI pumps that can deliver large fuel volume at 90psi, there are plenty that can at 40-50psi.

Currently I'm running #75 injectors on a stock Audi CIS pump with 40psi base pressure.  Anyway, lets not get off topic  ;)

Javad

> I read Hap ran out of fuel.  Why?  Well he had more air density going thru his motor, all else being equal, and he needed more fuel he didn't have.
>