BOB, Great times at Cayuga. Your 14.85 is well deserved. I know you've
been frustrated for a long time. Feels Good EH? D
Bob Tom wrote:
>
> Hi
>
> After a few puzzling weeks since the Cayuga track opened this year,
> I finally was able to set a personal best ET of 14.85 sec. @ 91.67 mph.
> This was done manually shifting 1-2 @ 4800 rpm and 2-3 @ 5000 at WOT
> (any higher shifts and the tranny would not shift).
>
> My mod addition from last year was the MPI. First, there were the
> disappointing times (15.8s) with a mismatched, custom programmed computer.
> Then there were shifts problems (not wanting to shift into the next gear
> at WOT) running 15.2s with the '96 MP PCM.
>
> About a month ago, I dynoed the MPI with that custom computer and it confirmed
> that low end torque loss was NIL (as a matter of fact, torque from 1200 rpm to
> 2500 were up substantially ... hp numbers in that range were up as well but
> not
> as substantially). From about 2700 - 4500, hp and torque dyno numbers were
> both down with the MPI but the torque curve was pretty flat. From 4500 to
> 5500 rpm (I limited the dyno run to 5600 rpm), torque and hp with the MPI
> were substantially higher again with a gradual drop in torque after 4600 rpm.
>
> Last Wednesday, I dynoed the MPI with the '96 MP PCM and the curves
> showed a similar pattern but with much higher numbers. It also showed near
> peak torque and hp numbers from between 4500 to 5500 rpm with my setup.
>
> Since my trap rpm was 4500 with 3.55SG and 26" tires, I had no track left
> to use this strong torque and horsepower.
>
> I swapped in 3.92 gears and, today I was going through the traps at 5000 rpm.
> Now, if I could only do 5500 rpm shifts 'without a gear not wanting to shift',
> I can only imagine what my ET and trap mph would be.
>
> As they used to sing ... the BEAT goes on ...
>
> Bob. Ontario, Canada.
> '97 Dakota CC, 5.2L, 3.92 SG, auto.
> Corrected max. rwhp = 227.4 Corrected max. rwtq = 335.0 lb-ft
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:51:01 EDT