On Sat, 16 Sep 1995 18:05:24 -0600 Terry McKitrick <tmckit(at)connect.ab.ca>
writes:
>>far better car to drive. At 60 m.p.h.in o.d., I am now turning 3,000
>>r.p.m., down from 4,000. If that great sounding little hole wasn't
You did not have a 4.22 rear end in the car if you were running at 4000
RPM in 4th OD.
4.22/3.89 is 9% not the 33% reduction that you seem to have gotten.
When I had a 4.55 gearset and no OD, I was running 3950 RPM (at)60.
When I installed the 3.89 set, revs dropped only to 3400.
I suspect that you had one of the really low diferentials in your car,
that, or OD wasnt working before, but now it is.
>>never run in any gear (except first) under 2000 rpm, upshift at 3000,
I am not gonna tell you where to shift your car, but the alpine makes
peak torque at 3800 RPM.
Me, if I had a rock stock alpine, I would upshift at 3500, and downshift
at 2500. Since the trans gears are spread apart by 30% or so, this
works well, and the motor stays unloaded and in the power band.
Shifting the alpine too low results in worse fuel consumption than
revving the motor higher.
The motor will make great vacuum with the more unloaded but
higher reving shift point.
This will gain better fuel economy and less wear and tear.
Jarrid Gross
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