Post by
mtcookson »
https://forums.nicoclub.com/mtcookson-u3042.html
Thu Dec 06, 2007 11:28 am
Not trying to go against your plans or anything... but it would take an incredible amount of body work to get an S30 to aerodynamically even get close to those speeds... but, if you're planning on doing that more power to you. I would love to see what kind of designs you come up with for that as aero mods for the Z (as far as actually heavily improving on them) are somewhat new.
Tranny wise, a Z32 5-speed would get you near those numbers with a Q45 differential (3.538) and if you want more than that will offer you can go a step up to the Armada differential, which is an R230 like the Z32 TT but with even larger axles and output flanges. That is available in 3.36 and 2.94.
Say you have your 275-30-19 tires and a 7,500 rpm redline your gear limited top speed would be:3.538 diff: 214 mph3.36 diff: 225 mph2.94 diff: 257 mph
Speed in each gear:3.538 diff:1st - 50 mph2nd - 84 mph3rd - 123 mph4th - 161 mph5th - 214 mph
3.36 diff:1st - 53 mph2nd - 88 mph3rd - 130 mph4th - 169 mph5th - 225 mph
2.94 diff:1st - 60 mph2nd - 101 mph3rd - 149 mph4th - 193 mph5th - 257 mph
For what you're wanting though I'd probably recommend the Cobra T56. It has a .63 6th gear whereas the Viper/'Vette/Camaro 6th is .50.
With a 7,500 rpm redline, the Cobra T56, your tire choice (275-30-19), and the Q diff (3.538) your gearing would be like so:1st - 60 mph2nd - 90 mph3rd - 124 mph4th - 161 mph5th - 201 mph6th - 255 mph
That gets you exactly to your goals for much, much less than the HKS unit would cost. Just some ideas.
Also, since you mentioned the Corvette transaxle I just wanted to throw in how cool that thing is. Its really a standard T56 like you'll find on the Cobra, Viper, Camaro, etc. however the tail section was just replaced with a differential. The differential bolts right to the rear of the transmission turning it into a transaxle. Its pretty awesome... I want to use one sometime in a custom built car, mid-engined car.