RE: RE: JET opinion * Your opinion wanted???

From: Mok, Alan (AMok@spbank.com)
Date: Fri Oct 30 1998 - 13:07:50 EST


That is VERY rich.

I run 12 psi of boost and see .6x from the o2 sensors at WOT.

Lean = mean, until it detonates.

Alan

'98 Dakota R/T (Headers, FABM & gave up on Shift kit)
'89 Mustang GT (347, Griggs GR-40 , Vortech S-trim...)
Ducati 996 (someday)

                -----Original Message-----
                From: Jon Steiger [mailto:stei0302@cs.fredonia.edu]
                Sent: Friday, October 30, 1998 8:59 AM
                To: dakota-truck@buffnet.net
                Subject: Re: DML: RE: JET opinion * Your opinion
wanted???

                On Fri, 30 Oct 1998, William Blount Arthur wrote:

> Jets definatly change the WOT curves too. I mean, my
times at the track
> prove that. Also, Like I said, you really need
something if you are
> putting headers and all that junk on there. If the
truck still had the
> same amount of gas and more air, well, it wouldnt know
and it would just
> run lean at WOT.
>
> Bill

                   You'd still be OK if you put headers and such on the
engine because the
                stock (and Mopar Performance) PCMs are set up to be very
rich at WOT. There
                might be a problem if you had a huge TB or something,
but I'm not exactly
                sure where the limit is. I did some testing recently
with Frank's 710cfm
                TB with both a MP PCM and my stock PCM. Both were still
rich at WOT despite
                the additional 200cfm over the stock TB.

                  At 14.7:1, an O2 sensor is supposed to read about
.45v, any higher
                is rich, any lower is lean. With the stock PCM, I got a
voltage of
                about .86 to .88. The MP PCM's fuel maps appear to be
even more rich
                than the stock one; it gave me a voltage of .88 to .90.

                                                              -Jon-

                  .--- stei0302@cs.fredonia.edu
----------------------------------------.
                  | Jon Steiger * AOPA, DoD, EAA, MP Race Team, NMA,
SPA, USUA * RP-SEL |
                  | '96 Dodge Dakota v8 SLT CC (14.58@93.55), '96
Kolb FireFly 447 |
                  `---------------------------
http://www.cs.fredonia.edu/~stei0302/ ---'



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