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post #1 of 5 (permalink) Old 07-06-2010, 11:08 PM Thread Starter
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Which gear to dyno in?

There has been a bit of debate (ok, alot) about which gear is most appropriate to dyno our cars in. From what I understand the car should be dyno'ed when the gear ration is 1:1 which in the Z is 5th gear.

My first dyno was completed in 4th but I'm having the car dyno'ed again on the weekend. Am I best to ask for 4th or 5th?

Only difference will be exhuast and air filter.

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post #2 of 5 (permalink) Old 07-06-2010, 11:16 PM
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5th.

You should always dyno at whatever ratio is 1:1. But... if you are looking for a direct before and after comparison, you will have to dyno in 4th again.

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post #3 of 5 (permalink) Old 07-26-2010, 12:37 PM
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typically, 250-300+whp cars will dyno in 4th. Its unnecessary to use 5th and higher gears unless you make a whole bunch of power which buries the RPM needle real quick. Just unneeded stress on the motor thats going to display the same graph in a lower gear.

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post #4 of 5 (permalink) Old 07-26-2010, 01:29 PM
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I agree, we usually dyno Z's in 4th, 5th gear takes so long to go through the rpm's, too much heat soak and results wont differ much if any from a 5th gear pull

Mine I dyno in 5th, the boost allows the rpm's to go by pretty quick plus it allows for a better chance of not spinning tires

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post #5 of 5 (permalink) Old 11-17-2010, 04:16 AM
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Good info. I was under the impression the majority of Z owners dyno in 4th.
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