1) How did you move the cam timing?
2) Std 2 bbl TB?
3) You can get more timing but you need the MP HP PCM. They may or may not
have made them for that yr/model. If they did, you'll have to hunt around
for one because they don't make them anymore. If they didn't make one
originally it may be possible to re-program the one you got. Call Mike
Leach at 714-639-5220 to see. If they can it's not cheap and you have to
send your PCM to him.
4) As for your 91 requirements, it's entirely possible that you've blown
your belly pan gasket. It may still be under warranty depending on mileage
and age, extended warranties etc. The way to check: Open your TB plates
and look down the bores with a flashlight. See a nice thick film of oil on
the bottom? If you do, you have found the source of part of your power loss
as well as the pinging. A blown belly pan gasket can sometimes be a pretty
big vacuum leak. Other checks you should make while you're at it. Vacuum
hoses, and little nipples that go on the intake manifold that sometimes fall
off causing a vacuum leak.
5) Performance problems can be caused by many things. You've got headers
and I assume the MPRB is a catback exhaust system. 1.6RR's maybe some,
maybe not. FIPK's good, make sure the filter's clean. Heads and TB are
probably your biggest bottlenecks especially in light of the headers. It's
hard to breathe out if you're not breathing in. And, of course, the PCM is
your other bottleneck in terms of performance. One would think the heads
would have gotten done prior to the TC but that's just me. I would
certainly consider a custom valve body (46RE) along with that TC, though.
Then, there's always SC'ing, but that's another chapter.
6) You'll get lots of expert opinions on this site, guaranteed.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile (URL follows)
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of Dave and Charlene
Sent: Sunday, July 08, 2001 7:19 PM
To: dakota-truck@buffnet.net
Subject: DML: "Advanced" question for the experts
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
----------------------------------------------------------------------
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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