HELP !!!! HELP !!!! Gear info
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From: Kitchener, Ontario
HELP !!!! HELP !!!! Gear info 
Car is an M6
28" tire
3800lbs with me in it
close to 700rwhp
7200 rpm red line
i am thinking 3:73
the 681 was @6600rpm on the dyno and you can see it's still going north, i was thinking of trying to pull it to 7000rpm
i think the car should go close to 140mpr in the 1/4
what would be right gear to put in the car for the track....
thanks
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From: Kitchener, Ontario
nput Parameters Are the Following:
* Top Speed MPH = 140
* Tire Diameter (Inches) = 28.00
* Peak Horsepower RPM = 6500
Computation Results:
# Computed Best Differential Ratio is 3.87 to 1
# Computed Maximum Differential Ratio is 4.33 to 1
would this be right
* Top Speed MPH = 140
* Tire Diameter (Inches) = 28.00
* Peak Horsepower RPM = 6500
Computation Results:
# Computed Best Differential Ratio is 3.87 to 1
# Computed Maximum Differential Ratio is 4.33 to 1
would this be right
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Verdad Gallardo I used this spreadsheet for an estimated MPH http://www.forcedinductions.com/etcalculator.htm but every car is different so its just a estimate.
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Well, since the software I wrote uses your true dyno graph as the input, a dyno graph would help out tremendously, but taking a guess at a general graph for 681rwhp @ 6900rpm & 590ft-lbs @ 5000rpm I got these results. This is all assuming near perfect traction, standard elevation/temp, and no wind, slicks with 4% tire growth, and good shifting, etc.
3.73's: 10.15 @ 137.24 / 5966 rpm / 4th gear
4.10's: 10.10 @ 139.13 / 6645 rpm / 4th gear
3.73's: 10.15 @ 137.24 / 5966 rpm / 4th gear
4.10's: 10.10 @ 139.13 / 6645 rpm / 4th gear
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Originally Posted by lt1_fool
Well, since the software I wrote uses your true dyno graph as the input, a dyno graph would help out tremendously, but taking a guess at a general graph for 681rwhp @ 6900rpm & 590ft-lbs @ 5000rpm I got these results. This is all assuming near perfect traction, standard elevation/temp, and no wind, slicks with 4% tire growth, and good shifting, etc.
3.73's: 10.15 @ 137.24 / 5966 rpm / 4th gear
4.10's: 10.10 @ 139.13 / 6645 rpm / 4th gear
3.73's: 10.15 @ 137.24 / 5966 rpm / 4th gear
4.10's: 10.10 @ 139.13 / 6645 rpm / 4th gear
cool....
the 686 was @ 6600rpm and yes a dynojet
Id say 3.73's man....... better of both. Easier on the street still and with a 28" tall Tire @ 7K RPM's you can run up to 150MPH in the 1/4......
The weight of your car is hurting your ET... oe will hurt it when ya hit the track.....
Kyle
The weight of your car is hurting your ET... oe will hurt it when ya hit the track.....
Kyle
