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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
That has been done on the intake side in the past in some cases. Ever noticed different length intakes on a drag car or such?

The chalange is you need to be able to adjust the timing and fueling then by cylinder or you will leave potental on the table or be running closer to the edge on some cylinders. Not an issue if you have a Motec or such and can micro tune the car.

Bassically you get that with an unequal length stock system to a degree.

However, if your goal is to widen the TQ band you can also set up different parts of the motor to work at different rpms. For example, a cam that works best at 5000rpm, an intake that works best at 6000rpm, a turbo that is most effecent at 5500rpm, and exhaust that works best at 5200rpm or some such.

Line all components up so they are most effecent at the same time and you will make more peak HP but for a narrower range.

On NA rally or street cars the exhaust is more often tuned to be at its best at TQ peak. On a race car it is often tuned to be at its best somewhere between TQ peak and HP peak.
Old 07-08-2010, 05:31 PM
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