The FMU increases the fuel pressure (stock is ~50, and with the 12:1 FMU,
fuel pressure will be 170PSI with 10# of boost, and the 8:1 with 10# of
boost, will give you 130PSI.. (If I'm thinking correctly)
Its running rich with both FMU settings, but not as rich with the 8:1
the 12:1 would just get richer, and richer, and richer untill it was almost
off the scale... (i have the autometer A/F meter too)
___________________
Tim Berry
Chesapeake, VA
97 CC, 4x2, auto, 318
Best 1/4: 14.10@96.8
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
> You run lean because you are not going into open loop. Increasing fuel
rail
> pressure to about 60 psi will help this. Not easily accomplished with our
on
> the tank fuel regulators. I got lucky with my truck, Off the stock pump I
> see 57 to 61 psi at the fuel rail. It should be 45 to 55. I'm not
> complaining at all. Or you can get a custom flash or MP PCM that will
widen
> the fuel curves. It looks like that my injectors don't reach full duty
cycle
> until 5800 RMP. I am looking at changing the custom flash so full DC hits
> around 4800 RMP. This will allow me to run less pressure through the fuel
> rails.
>
> Mike Williams
> 00 Blk R/T RC - ProCharged
>
> ----- Original Message -----
> From: "Tim Berry" <coolva1@home.com>
> To: <dakota-truck@buffnet.net>
> Sent: Friday, August 18, 2000 7:16 AM
> Subject: DML: Re: RE: Supercharger Guru's (or anyone else thats a guru
with
> tuning an engine)
>
>
> > I have the BTM up a little, it dosent ping.... I was just wondering what
> the
> > best combo was for power.... and to tell ya the truth... the 24#
injectors
> > still run lean at times... =) (not at WOT tho)
> > ___________________
> > Tim Berry
> > Chesapeake, VA
> > 97 CC, 4x2, auto, 318
> > Best 1/4: 14.10@96.8
> > ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
> > ----- Original Message -----
> > From: "Bernd D. Ratsch" <bernd@texas.net>
> > To: <dakota-truck@buffnet.net>
> > Sent: Thursday, August 17, 2000 11:22 PM
> > Subject: DML: RE: Supercharger Guru's (or anyone else thats a guru with
> > tuning an engine)
> >
> >
> > > From a engine longevity standpoint, the pinging part really huirts the
> > > engine more than the rich mixture. Have you tried smaller injectors?
> > From
> > > what you're saying, it sounds like the 24# are too much. What about
the
> > 19#
> > > "High Flow"?
> > >
> > > - Bernd
> > >
> > > -----Original Message-----
> > > From: owner-dakota-truck@buffnet.net
> > > [mailto:owner-dakota-truck@buffnet.net]On Behalf Of Tim Berry
> > > Sent: Thursday, August 17, 2000 10:03 PM
> > > To: dakota-truck@buffnet.net
> > > 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
> > >
> > >
> > >
> >
>
>
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:53:29 EDT