M6 gearing input

Stormtroopin5.0

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As slow saturdays go this one has been especially slow which led to a heated discussion with a coworker on better rear gearing for an +18 and up MT82 car. I’m contending that with the changed MT82d gearing that 3.73’s are the better choice unless boosting. I’m curious to hear opinions on which stock rear gearing is preferable and why?

 

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As slow saturdays go this one has been especially slow which led to a heated discussion with a coworker on better rear gearing for an +18 and up MT82 car. I’m contending that with the changed MT82d gearing that 3.73’s are the better choice unless boosting. I’m curious to hear opinions on which stock rear gearing is preferable and why?
It depends on a lot of different variables.

For the 18+ MT82, the 3.73s are a must. My 2016 MT82 GT with 3.73s was much more lively than my 2019. The change in gear ratios really dulled-down the car.
 

Mikepol2

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4.09’s were my favorite mod on my 2018 PP1 6-speed. Had no desire for anything steeper after installing them.
 

K4fxd

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18 up 4.09's are very close to 17 down 3.73's
 
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Stormtroopin5.0

Stormtroopin5.0

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The real question is minus boost, why even get a car with 3.55’s?
 

K4fxd

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Stormtroopin5.0

Stormtroopin5.0

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K4fxd

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My car with 3.55's goes through the traps at 7600 RPM in 3rd gear. It would go through the traps at 6100 in 4th with 3.73's. It would go through at 7400 with 4.09's. So with my car and tire size either 3.55 or 4.09 are the gear for me.. Road course I also like the 3.55, it is not as hard on the gear oil and I shift less.
 

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That is a decent guide, Wallace racing has many charts and calculators but actually going through the traps is best. You need to do it at least 3 times to get a real idea of what MPH you will run, then you want to gear for HP peak or just after at the finish line.

http://www.wallaceracing.com/Calculators.htm
 

 
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