4.10 gears now, runs 11.7, what gear do I need?

[goat-ee]

My 96 Cobra with Hellion turbo @ 10psi is running 11.70's @ 120mph. I still have the 4.10 gears from when it was bolt-ons and nitrous. I keep hearing that a shorter gear like a 3.27, 3.55 or 3.73 would be better. While I don't race all of the time, I want the gear that will give me the best possible 1/4 mile time. And how much can I expect to gain?

Anyone have experience in a turbo, manual car with steep gears that can speak to this?

This what it looks like from in-car at the track.

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[Digital]

3.55 or 3.31

 

[BOSS 32V]

3.31's

 

[y2k2gt]

Clearly shows in the video that you don't stay in the lower gears very long. I run 3.27's. You need to let the turbo work!

 

[Cobra8urZ06]

3.08's and a 4r75w

best i could get in my 03 was 11.6@132 with 3.55 going through the traps at the top of 4th

 

[quikcobra]

You should be good with 3.55 good for road/race JMO. And you wont have to shift so darn fast.

 

[2bscrewed]

I have 3.73's in my car, and 28" tires, and they seem to work pretty well. If you go to a 3.55 or lower with a stick/turbo car, it is not gonna want to come off the line at all.

 

[Mustang Matt]

goat-ee, You're running wotbox right? How much is boost dropping between shifts? I don't have an answer on the gears. I just dropped my car off with Bob Monks for a single 70mm and we decided to drop from 4.30 to 3.55.