Ihave run into the problem of detonation in my 94. I'm running a Vortech
and have installed a Jacobs bosstmaster that retards the timing under boost
conditions. This seemed to have eliminated my detonation problem since I
can dial in the amount of timing retard that I desire. The problem I have
is with the Mopar SBEC cutting the fuel out at around 6100 rpm. I can't
seem to get around this problem. Does anyone know of a place that custom
calibrates the computers to eliminate the fuel shut off?
I am also investigating a 360 swap for the summer. I have contacted a
place called Hughes engines from Washington IL. I know they do excellent
work and Dave Hughes is a huge MOPAR fan. I'm considering a Magnum 360
balanced and blueprinted, 9:1 JE forged pistons, Total Seal rings, Mopar
camshaft from their Magnum 380 engine, heads ported and 2.02 valves
installed, M1 single plane manifold with a four barrel throttle body, and
fatter fuel injectors. I'll keep everyone posted about my research. If
anyone has any ideas please contact me.
Dan Colucci
94 Sport Vortech, and much more!
----------
> From: david zavetsky <zavetsky@usaor.net>
> To: dakota-truck@buffnet.net
> Subject: Re: DML: RE: Detonation
> Date: Saturday, December 13, 1997 7:41 AM
>
> Back in 93, I was one of the first folks to get the MP computer in my 318
> Dak.....It went back a couple times for this same problem...
>
> The guys at the shop which "programs" the computers suggested a few
things....
>
> Checking for manifold leaks was one of the them.......Pull the breather
and
> PCV valve......Tape ooff the pcv valve hole and put your thumb over the
> breather hole while truck is running......Hold a few seconds......Lift
thumb
> and you otta feel a rush of air come out.....This supposedly indicates
that
> all is sealed well....If the airflow is weak or not there at all, you
have a
> intake leak...
>
> I did this and I dont.....But I DO have the same pinging problem......
>
> I have learned to live with it (unfortunately)....about 4200-4500 rpm
heavy
> throttle....
>
> The truck runs great otherwise...
>
>
> At 12:02 AM 12/13/97 -0500, you wrote:
> >First question: does the fuel you buy contain an oxygenate? We used to
> >have it here in NC 'til everyone started complaining of engine knock,
and
> >again after having to have major repairs since the detonation will
destroy
> >bearings. Great for emissions, bad on engines.
> >
> >Second: How much total advance does the computer allow? My '92 max's
out
> >at about 3500 rpm and from what I can figure, spark advance stops in the
> >early/mid 20 degree range. I get some knocking from 4200 to the shift
rpm
> >at 4800 during WOT. It's worse in the winter since the air is colder
and
> >thus more dense. For some reason I can't explain, the computer isn't
> >sensing the denser air and isn't adding fuel to the mix so in the higher
> >rpm's, it will lean out a bit. I've rotated my distributer a bit to
have
> >and initial advance at 12 degrees BTDC. After a few minutes the
computer
> >compensates.
> >
> >Smitty - KF4UQY
> >Raleigh, NC
> >
> >-----Original Message-----
> >From: acasey@io.com [SMTP:acasey@io.com]
> >Sent: Friday, December 12, 1997 4:51 AM
> >To: dakota-truck@buffnet.net
> >Subject: DML: Detonation
> >
> >Another tech question for the list.
> >
> >I have started noticing my engine detonating badly as I approach 5000
> >rpm. This is a serious problem that will keep me off the track this
> >weekend. So instead I will be spending Saturday in the driveway
> >trying to isolate the culprit. I plan on doing the following, so if
> >ya'll can think of anything else to try or look for please let me
> >know.
> >
> >1. Check all the plugs and plug wires.
> >2. Check rotor and distributor cap, (there only about 6 months old).
> >3. Disconnect my MSD and switch back to the stock coil.
> >4. Check fuel presure
> >5. I plan on reading up on adjusting the distributor position in the
> > Haynes manuel, and then try playing around with it.
> >6. I guess I could try a lower temp thermostat, but the engine is not
> > getting hot.
> >
> >Maybe some of our Supercharged members have run into this before???
> >
> >Anyway any help would be appriciated.
> >
> >Alan...
> >
> >94',SLT,V8,5spd,MP SBEC,Flowmaster,SureGrip,MSD w/blaster
> >coil,Pulleys,1.7 Roller rockers,Super Street TBI,Taylor
> >wires,Chanpion truck plugs gapped at .40
> >
> >
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