so is it better to have more torque at the top end of the RPM curve. or the bottom end?
-dan
-----original follows---------
Date: Tue, 06 Jul 2004 15:13:59 -0700
From: Kyle Vanditmars <kylevan@telus.net>
Subject: Re: DML: Shift Points
On Tue, 06 Jul 2004 14:32:10 -0400, Dan Kramarsky wrote:
>
> my '92 cc dak which is stock, naturally apirated, engine most likely has this standard
> curve:
>
> http://www.krcperformance.com/marty_dyno/318throttle%20body.JPG
>
To expand on what Tony said. Given an infinite redline, the proper shift
point would be when the torque being applied to the wheels in the current
gear is just about to drop below the torque that will be applied to the
wheels after the shift and associated RPM drop. But, since redline will
often occur before this point, you generally shift at redline. Keep in
mind, you have to calculate the mechanical advantage of 1st gear over 2nd
gear, not just what torque the motor is producing according to a dyno pull.
Here is a fairly indepth explanation:
http://www.allpar.com/eek/hp-vs-torque.html
------------------------------
=====
Dan K.
'92 Grey Dak CC, 318, 4x2, 46RH, 3.92 rear, 235/75R15, PS, PW, PB, PL, AC.
Mods: Trans-Go, APS Precision's 2400 stall, cool air induction, K&N filter, Autolite 3924s, & re-located IAT sensor.
Future: 180* stat, MP PCM, Stage 1 T.B., HER1418AL Cam, 3" Gibson exhaust, March pullies, electric fan, and head porting.
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