Under Boost conditions and using pump gas you should be no leaner than a
12.5 to 1 Air/Fuel. Somewhere in the 11s to 1 Air/Fuel is fine. Richer
than 11 to 1 Air/Fuel and the power starts to drop off. Being ignorate on
what type of S/C and setup you have, how are you determining if running
rich?? The only way I know that you can get a true air/fuel curve reading
is using a Dyno with a probe.
Of course the leaner the more power, BUT..like it has been said before; it
is much, much better to run rich than lean. Running Lean you will brake
something!
----- Original Message -----
From: "Tim Berry" <coolva1@home.com>
To: <dakota-truck@buffnet.net>
Sent: Thursday, August 17, 2000 11:02 PM
Subject: DML: Supercharger Guru's (or anyone else thats a guru with tuning
an engine)
> Okay...
> Long time ago (month?) I put 24# injectors in my truck, and all was good
> (supercharged)
> Stock FMU was 12:1 and i put the 11# pully on it... and now push 8# of
> boost.. It cause the air/fuel ratio to go wayy rich under alot of
boost...
> (almost off the scale)
>
> My question is... With the 12:1 FMU, i didnt need to retard the timing...
> but she ran realllllllly rich under boost..
> I've re-calibrated it to 8:1 (recomended for 24# injectors) and its
staying
> on the rich side, but now I ping with out retarding it..
> Which is better for power? the 12:1 running rich... or the 8:1 which is
> just on the rich side, with some retard (less than 1* per pound of boost)
>
> I'm lost... some times it feels stronger with the retard, other times it
> dosent... HELP!!! =)
> ___________________
> Tim Berry
> Chesapeake, VA
> 97 CC, 4x2, auto, 318
> Best 1/4: 14.10@96.8
> ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
>
>
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