I run the autometer A/F gauge. It's o.k to get you in the 'ball park', but
it doesn't really tell you by what degree you are running rich. Each gauge,
set-up, and O2 sensor gives a slightly different reading. Mine shows 1
yellow (strophic) and 3 green (rich) when I'm under boost, for my situtation
that is around 12.5 to 1.. per Dyno results.
and to answer the other point, 'way rich' will cause CAT failure.....lean
will burn hole in piston, brake rings, etc...and lean means 13 to 1 A/F or
higher under boost conditions.
----- Original Message -----
From: "Tim Berry" <coolva1@home.com>
To: <dakota-truck@buffnet.net>
Sent: Friday, August 18, 2000 7:18 AM
Subject: DML: Re: Re: Supercharger Guru's (or anyone else thats a guru with
tuning an engine)
> i have an air/fuel ratio meter... tis how I can see
> ___________________
> Tim Berry
> Chesapeake, VA
> 97 CC, 4x2, auto, 318
> Best 1/4: 14.10@96.8
> ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
> ----- Original Message -----
> From: "Ransom T Holbrook" <ransom@setel.com>
> To: <dakota-truck@buffnet.net>
> Sent: Friday, August 18, 2000 6:23 AM
> Subject: DML: Re: Supercharger Guru's (or anyone else thats a guru with
> tuning an engine)
>
>
> > 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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