DML,
Went to the track saturday with the R/T. It was hot 90+deg. and 65%
humidity. The R/T ran consistent15.4s with a 15.3 too! Its best previous
time was 15.77. Now, the mystery. My top speeds were 10 mph slower than my
previous, slower runs. Bone stock I was consistently turning 15.8 at 86
mph, now, with my mods Im doing 15.4 at 78 mph?? I have a JETII, JBA
headers, a home brew cold air system w/K&N drop in. At the track I removed
the air cleaner at the throttle body with no change to ET or top speed. Im
baffled as to the change, but pleased with the ET improvements (.4seconds).
I took the JET chip out after I got home and I could feel a reduction part
throttle pull, but the top end seemed to come back. Now if I could get both
14s might be possible. I did beat a 5.0 stang (and a supercharged honda)
but the 6 pack road runner was a little out of the Daks leage (12.2 ET).
The fastest car at the track was a stock looking 92 stang that turned 9.6
and scared the driver (dual paxton superchargers on a 351 clevland)
Why is my top end so slow....
Bruce
-----Original Message-----
From: Holloway,Frank T [mailto:Frank.T.Holloway@KP.ORG]
Sent: Monday, August 24, 1998 6:42 AM
To: 'dakota-truck@buffnet.net'
Subject: DML: RE: Jet II question for Frank H. III
Steve,
I really have no idea how a JET chip would fail. Probably many different
failure scenarios. I would hope that if it failed, the engine just
wouldn't run, that way you
could just unplug and remove the chip, replug and the engine would start
and you would know the chip was the problem. I have had one situation
where the chip
wasn't seated, the truck wouldn't start. If you really suspect the chip,
try disconnecting the battery, unplug and re-seat the chip, then
reconnect the battery. Allow
the stock ECM to re-learn. There are approx. 14 adaptive cells in the
stock ECM for ignition and fuel offsets. It takes approx. 50 driving
miles and two drive cycles for these to be modified, and they are
continually being changed. I suspect that weather has more to do with
the power variations than the chip itself (providing the chip is still
working).
> -----Original Message-----
> From: O26ON4@aol.com [SMTP:O26ON4@aol.com]
> Sent: Sunday, August 23, 1998 7:05 AM
> To: dakota-truck@buffnet.net
> Subject: DML: Jet II question for Frank H. III
>
> Frank,
> I believe remembering your stating the Jet had a microprocessor in it.
> I
> installed one and immediately sensed improved drivability,
> acceleration, etc.
> Lately, the R/T has felt sluggish, much like before the Jet
> installation,
> which got me to wondering, what happens if the microprocessor or other
> area of
> the Jet ceases to function properly, does the truck die, run very
> ragged, or
> just revert back to the stock functions? Could the problem be
> psychological
> and my SOPD (seat of pants dyno) is telling me it's time for more hp?
>
> Regards,
> Steve Waller in Houston
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