From: "Bob Tom" <tigers@bserv.com>
To: <dakota-truck@buffnet.net>
Sent: July 9, 2001 6:51 AM
Subject: Re: DML: "Advanced" question for the experts
> At 10:19 PM 7/8/01 -0400, you wrote:
> >While helping a friend with his R/T that has numerous bolt-ons( MP
> >PCM,Headers,Cam,1.6 roller rockers New 2bbl MPI intake,FIPK,MPRB?
> >exhaust,180 stat.,high stall(2800)convertor) it doesn't seem to work as
> >well as it should(99CC,14.2s at 95 I think is the best on slicks)I
noticed
> >one thing that disturbs me. When you drive it, it seems kind of"dead"
,sort
> >of like not enough ign. timing. At WOT its only getting about 20-24 deg.
> >timing depending on RPM(using a DRB3).Now to ME this doesn't seem like
> >enough. I would think at least 32deg. My STOCK Jeep PCM gets 28-31!!(it
> >rattles on 91) I checked another MP one,98 5.2 ones and its the same. All
> >these guys can run 87 and they don't ping.Any thoughts?? What SHOULD this
> >thing run?? Are there alot of R/Ts with these mods running quicker?? Not
> >alot of these up around here where I live.Oh and moving the cam timing
> >around helped little,and its not lean. Dave St.Louis
>
> Except for the 5.9L, my truck is about the same weight and similarly
modded.
> At WOT and running with a '96 MP PCM, timing is 31 degrees from 4500 rpm
> and up. With the '97 MP PCM (CA version, no Fed version), which I use on
> the streets to have functional gauges, timing under the same conditions is
> 27 degrees and runs 1/4-mile 0.80 sec. slower. My best with the '96 MP
PCM
> is 14.71 under 70F temps., 70% humidity, gusty 15 mph tailwind.
>
> It would seem that the '98 and '99 PCMs have been retarded for either EPA
> or pinging or both. I use 92 octane for both '96 and '97 MP PCMs
Yeah I'm going to try a modded crank sensor and see if i can't get about 5
deg. more timing in it. It doesn't even ping with 87 crap in it!
Dave St.Louis
----------------------------------------------------------------------
98 GRAND CHEROKEE LTD. 5.9L {14.82@91}
89 LEBARON GTC Conv. Intercooled 2.5 {14.13@95}
88 SHADOW ES Intercooled 16V DOHC 2.2 {11.95@122}
89 SPIRIT ES
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