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remski2

Gear ratio manual calculation.

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Hi.

Is there a way to manually calculate the Gear Ratio Table from logged data ?

As I am street tuning the car by myself. 

I've read that "Gear Ratio = Engine Speed (RPM) / Speed sensor frequency (Hz)". Is that correct ? and if so which value is used.. as the frequency has a range in perticular gear.

 

Thank you

Remi

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You can log RPM and the DI frequency and pick a point in your log where you know what gear it was is and just divide one by the other and enter the result in your table.  Im not at home to test but I had a vague recollection that the gear ratio number was actually RPM/KMH so it might pay to log speed as well try that if RPM/Frequency didnt work.

The other option is just to jack the wheels up of the ground and do the quick auto gear calibration on the spot.

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Hi.

I've used RPM/kmh and it worked.

There is also a "Gear Ratio Calc. (RPM/kmh)" log variable that will give you all your gear points without pulling out a calculator.

Thank you.

Remi

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