Test & Tune at Pacific Raceways

[goucho]

my best with street tires and 3.31 gears at pacific was a 12.04@121mph

Nice! So when you say 3.31 gears, obviously you have longer gears so you can get through the 1320 in 3 gears rather than going into 4th. But what exactly does 3.31 refer to? Is that the final drive gear ratio?

 

[SnakeBit]

yes final drive i wanna go to 3:73's and i hit 4th in the quarter

 

[SnakeBit]

heres the breakdown after some calculations
ratio's mph@6200rpm
1st-2.97 51mph
2nd-1.78 85mph
3rd-1.30 116mph
4th-1.00 150mph
5th-0.80 188mph
6th-0.63 239mph

now with that said for me to actually obtain 239mph due to drag I would have have around 1016rwhp

at my current rwhp the top speed i would be able to obtain would be right around 193mph

 

[ProteusGodz]

I've tried to look into but what do the newer GT's run? What about the Boss or GT500's? Not looking for exact times, just a range to have an idea.

well the new GTs run 12.5-12.7 far as others i dont know