Tuning with differential gear in.
Thread Starter
Joined: Oct 2009
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Tuning with differential gear in.
I have a little confusion about this and maybe someone can clarify.
When running/tuning on a Dynapak or mustang Dyno, the Hp/tq curves are calculated based on the wheel power.
Having modified a differential gear i.e. 4.44 or 4.77 swap. You should have a false HP gain, or not? (assuming no adjustment are made on the dyno)
When running/tuning on a Dynapak or mustang Dyno, the Hp/tq curves are calculated based on the wheel power.
Having modified a differential gear i.e. 4.44 or 4.77 swap. You should have a false HP gain, or not? (assuming no adjustment are made on the dyno)
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Joined: Jan 2008
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Yes, the numbers will be off. If you want true numbers, a simple mathematical calculation will give you a correction factor for the tuner to plug into the dyno computer.
Say, if stock is 4.1, and yours is 4.44, then correction factor will be like 4.1/4.44= 0.9234. So if your dyno max HP reading is 350RWHP STD correction, then your real number is: 350*0.9234=323, as compared to other S2000s dynoed in the same gear, i.e. 4th.
But acceleration will still feel good as 4311!
Say, if stock is 4.1, and yours is 4.44, then correction factor will be like 4.1/4.44= 0.9234. So if your dyno max HP reading is 350RWHP STD correction, then your real number is: 350*0.9234=323, as compared to other S2000s dynoed in the same gear, i.e. 4th.
But acceleration will still feel good as 4311!
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