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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Yes a 915 has lower ratios that maintain the motor at a higher average HP.

People mistakenly think Torque is what accelerates a car. Not really. Power dose.

It dose not matter if you make power at low rpm or high rpm. 300hp is 300hp.

However, one car that makes 300ft lbs might make 200hp and another that makes 300 ft lbs might make 400hp. With the best gear ratios it each car the second car is going to be a lot, lot faster.

Yes more TQ makes more power but more TQ at a higher rpm makes much more power.

Torque is just a mesurement of how much power our motors make from only three cylinders firing over 360deg of operation.

Torque is nothing until its effort is multiplied first how many events can be fit into a period of time (RPM) and then such power output is further multiplied by the leverage of the transmission (gear ratios).

It is however a good point of reference to as to how efficent our motors operate (VE) and where they operate the most efficently. Thus, it is as noted it is good to study carefully one's TQ dyno plots.

In some cases setting up a transmission where it drops RPM to TQ peak(old rule of thumb) will be a fast set up. However the true goal is to keep ones average HP as high as possable.









Now, if we decide to stick with a stock 4 spd transmission, we would want to build a motor with as wide of a HP curve as we can.
Old 02-26-2010, 05:10 PM
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