High hp/tq application, SINGLE OVERDRIVE, 6spd options?

[T_Raven]

I wouldn't exactly say it's lazy to have a typical 5 speed gear set with an extra over drive, or that it's a band-aid fix to run a deeper rear gear. What you're looking for sounds like a 5 speed with an extra 1st gear. That's kinda the same thing as a 5 speed with an extra OD lol. Tire size, axle gears, and transmission gears all effect RPM in a certain gear and that's really what matters.

For example. If you have 4.10s in a 4th gen F body, which I do and a lot of 4th gen guys do, your final ratio in each gear would look like this:



2.66, 1.78, 1.3, 1.0, .74, .5 (T56)

10.9, 7.2, 5.33, 4.1, 3.03, 2.02 (with 4.10 rear)

So with the V161, if you wanted the same ratio in 6th gear, you'd need a 2.5:1 rear. If you wanted the same ratio in 1st, you'd need a 2.93:1 rear. Those 2 transmissions have really deep 1st gears. Gear sets are weaker when the gear size differences are bigger. That's one reason transmissions with deep 1st gears are rated for less hp/tq.


3.72, 2.25, 1.54, 1.21, 1.0, .82 (V161)

9.38, 5.63, 3.85, 3.03, 2.5, 2.02 (2.5 rear)

10.9, 6.6, 5.4, 3.55, 2.93, 2.4 (2.93 rear)

That trans has a bigger drop from 1st to 2nd and the rest of the gears are closer than a t56. 1st gear in both of the Getrags is way deep. You'd never use it without having super tall gears like what I have laid out.

I guess it all just depends on what gear spread you want, what RPM range you plan to use the car in, and what final ratios you want in 1st or 6th.

[DavidBoren]

Yeah, I'm not a fan of the V16x 1st gear, either. I just like that it has a 1:1 fifth gear.

A custom gear set for a T56, that still has two overdrive gears, is not the answer for my problem. A custom gear set with a 3:1-to-0.6:1 spread, with 5th gear being 1:1... now that would be awesome.

I want something more like this:

3:1 (1st), 2.5:1 (2nd), 2:1 (3rd), 1.5:1 (4th), 1:1 (5th), 0.5:1 (6th)

Why doesn't that exist?

[cwylie]

The V160 might be rated at 450hp but I have seen them take a serious beating behind 1000hp motors.

[DavidBoren]

The V16x is generally found behind high spinning motors, and I am wondering if there would be a difference in its capacity to handle the same torque as delivered by a V8.

Is 400ft/lbs of torque @ 4,000rpms easier on a transmission than, say 400ft/lbs @ 2,500rpms?

[Flash68]

Originally Posted by DavidBoren

I want something more like this:

3:1 (1st), 2.5:1 (2nd), 2:1 (3rd), 1.5:1 (4th), 1:1 (5th), 0.5:1 (6th)

Why doesn't that exist?

I bet G-Force would build that for you.

[no go nova]

Build a short stroke ls motor with a low lash solid roller cam that will spin to 8500 rpm then that supra trans would work great. theres a few of those trans in 7 sec qtr. supra and the trans are stock!

[DavidBoren]

Originally Posted by no go nova

Build a short stroke ls motor with a low lash solid roller cam that will spin to 8500 rpm then that supra trans would work great. theres a few of those trans in 7 sec qtr. supra and the trans are stock!

I like the way you think...

Hmm, putting a 4.8 crank (3.3" stroke) in an LS7 (4.125" bore) gives you 353ci of high revving goodness. And they spin the LS7 past 7k with a 4" stroke! So imagine what it can do with that little 3.3" crank.