R34 Gtt 6 Speed Conversion

[taz2069]

which would be better to put in a r34 gtt a FS6R31A 6speed 350z tranny or FS6R92A 6speed s15 tranny just wondering.

[Simon-S14]

The 350z box hands down.

The s15 box won't last 5 mins

[sonicz]

Isn't this obvious? The s15 box was designed to go in a low powered low torque light weight car.

Edited January 24, 2014 by sonicz

[GTSBoy]

I think you might be surprised as to how much difference there is between the two gearboxes. Don't forget the S15 has a turbo, so the torque output is pretty high.

Nevertheless, I would vote for the Z car box over the S15 box. I mean, people with S15s were famously replacing the 6 speeders with 5 speeders because the little SR20 5 speeder was stronger.

[B-rice]

Will a 350z box Bolton the R34gtt though also are they any stronger than Rb25 boxes. Could be a good mod for economy and possibly higher speeds.

[Sick_R31]

How so? The RB25 5th gear is 0.752 compared to the Z33's 6th gear which is 0.794

[sonicz]

I think you might be surprised as to how much difference there is between the two gearboxes. Don't forget the S15 has a turbo, so the torque output is pretty high.

Nevertheless, I would vote for the Z car box over the S15 box. I mean, people with S15s were famously replacing the 6 speeders with 5 speeders because the little SR20 5 speeder was stronger.

Maybe, I am not really familiar with the s15 boxes. But my observations have always been that gearboxes suffer the most stress and damage when they are suddenly shocked with lots of torque in a small space of time. The sr20 engine doesn't really fit into this category, even with a turbo. Sure torque output on an turbo s15 can be high, but its usually up high and once the clutch engages and everything starts building momentum the stress on components is much more linear and manageable.

Driving like an idiot is not accounted for of-course. That's why you get lots of broken drive train components and mounts because people are dumping the clutch on wide after-market wheels with grippy tires and high output engines on cars that were never designed to handle that kind of abuse.

Edited January 24, 2014 by sonicz

[r32-25t]

The 6 speed s15 box dies behind 200rwkw sr20s it's got no hope in a turbo r34

And sr20s actually make a decent amount of torque for a 4 cylinder due to their long stroke

[GTSBoy]

Stroke length has nothing to do with torque production characteristics. If you don't believe me, go do some research (and not on automotive forums, where you will hear the same wrongness peddled all the time).

[GTSBoy]

Will a 350z box Bolton the R34gtt though also are they any stronger than Rb25 boxes. Could be a good mod for economy and possibly higher speeds.

And no it won't bolt on. Assuming that they are common with the big frame Nissan 5 speeders (big assumption, almost certainly wrong), you have to build up a box using appropriate front and rear halves. Otherwise you're into the territory of using adapter plates. I'm pretty sure that this is how it has to be done. Plenty of VQ into R chassis conversions using the original R chassis gearbox have been documented with adapter plates, and I don't think I've ever heard of someone Frankensteining two halves of the different gearboxes together.

Frankensteining can be done with VG gearboxes, because only the bellhousing half of the box is different.

[B-rice]

yeah definitely not worth, it will cost you possibly more than getting gears strengthened or fresh ones if your lucky enough to source them cheap.

[r32_rb30det]

go t56 ls1 gearbox

[zebra]

Yeah do that.....cause a 6L v8 cant accelerate in 6th with 3.9:1 gears

so would make perfect sense to put one behind a 2.5L six