Hal, info on your automatic gear ratio.
Gear Ratios for Automatic Transmission (all years)
Gear Ratio
1 2.611
2 1.466
3 1.025
4 0.684
R 1.909
Final Drive 4.428
Manual
Gear 5-speed 6-speed short nsxr
1 3.071 3.071 3.071
2 1.727 1.96 1.952
3 1.23 1.43 1.4
4 0.967 1.12 1.033
5 0.771 0.91 0.771
6 0.72
I read an excellent article in the FAQ section on gears: http://www.nsxprime.com/FAQ/Performance/gears.htm
If Bob Butler is still around I had a few questions:
Bob used "finite-difference solution of the energy equation which governs acceleration" I would assume this means P=F.v where you take the P from the dyno curve then divide out v as calculated by the gear ratio to get an F. Then you subtract out the rolling friction and air friction forces to get a net F. From this you use F=ma and calculate acceleration? This would assume constant acceleration so you could use the v=vo+at to calculate time? What equations did you use? What equations did you use for rolling reistance and air friction? i think I remember air friction is a cubic funtion?
I am trying to set up a spreadsheet to calculate 0-60 times, etc taking into account gearing and horsepower. I would like to import the dyno curve input gear ratios to see if the short gears or stock gears are better for various operating conditions. I wounder if the stock gears would be better for higher horsepower engines?
From a fundamental concept point of view it would apear that changing the R&P to a 4.55:1 would simply reduce the speed at which you shift gears while the short shift kit will change the RPM?
I would appreciate any replies.
Scott
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Gear Ratios for Automatic Transmission (all years)
Gear Ratio
1 2.611
2 1.466
3 1.025
4 0.684
R 1.909
Final Drive 4.428
Manual
Gear 5-speed 6-speed short nsxr
1 3.071 3.071 3.071
2 1.727 1.96 1.952
3 1.23 1.43 1.4
4 0.967 1.12 1.033
5 0.771 0.91 0.771
6 0.72
I read an excellent article in the FAQ section on gears: http://www.nsxprime.com/FAQ/Performance/gears.htm
If Bob Butler is still around I had a few questions:
Bob used "finite-difference solution of the energy equation which governs acceleration" I would assume this means P=F.v where you take the P from the dyno curve then divide out v as calculated by the gear ratio to get an F. Then you subtract out the rolling friction and air friction forces to get a net F. From this you use F=ma and calculate acceleration? This would assume constant acceleration so you could use the v=vo+at to calculate time? What equations did you use? What equations did you use for rolling reistance and air friction? i think I remember air friction is a cubic funtion?
I am trying to set up a spreadsheet to calculate 0-60 times, etc taking into account gearing and horsepower. I would like to import the dyno curve input gear ratios to see if the short gears or stock gears are better for various operating conditions. I wounder if the stock gears would be better for higher horsepower engines?
From a fundamental concept point of view it would apear that changing the R&P to a 4.55:1 would simply reduce the speed at which you shift gears while the short shift kit will change the RPM?
I would appreciate any replies.
Scott
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