Ideal Gearing Discussion (200mph and beyond)

[RC45]

I would like to try my hand at open road racing, standing mile events etc, and am busy working on a transmission.

Sadly I do not have an unlimited budget, so as with the rest of the car, I am going to have to settle for a single set of transmission ratios to attend HPDE's, Standing Miles, Open Road Race Top End runs etc.

Here are some transmission scenaros I have worked up. I am inviting discussion and comment based on heresay, facts, personal experience, slide rule calculations, pure speculation and bar stool bench racing

a) Which setup will be the quickest.
b) Which setup will feel the quickest (but may not be)
c) Which setup appears to be almost ideal?

Peak torque for the current setup is at 5500rpm, rev limiter is set to 7,000 with shifting set for 6,900rpm.

Let the games begin.

MM6 / 3.42 Combos


MM6 / 3.15 Combos


M12 / 3.42 Combos


M12 / 3.42 Custom 5th Gear Combo


M12 / 3.15 Combos


M12 / 3.73 Combo


[edit] Looks like GM was thinking along the same lines... this is what the C6 Z51 T56 looks like
Z51 T56 / 3.42 Combo


[edit..edit]Looks like GM really did their homework on the new ZR1 transmisison ratios - on the 20" rear wheel the ZR1 5th runs deep into 200mph territory, but with a 345/30/18 I would still need to shift at close to 200mph... not the ideal situation, but the transmission sure looks well spaced.

ZR1 / 3.42 Combo

[MPM IV]

What gears do you have now? Do you drive on the street much?
My car likes to be at or above 2k rpm, so lower gearing isn't an option. I think it would be ideal with 3.73 or 3.90 for drivability, but I have traction problems now, and guess you do as well, so thats out. I spoke with RPM and they recommended the MN6 with custom 5th and 6th gears for a top speed of 212 at 6k rpm if I remember correctly. Hope that helps.