R32 gtr transmission strength, billet plate

[cosline]

Hi,

I have a r32 gtr transmission. Does any of you guys have an idea how much power it will hold with the billet center plate and stock gearset?

At what power level and use did yours brake with or without billet plate?

Thanks, Oystein Lovik

[Duncan]

I'll let others with more breakage chime in, but I can't think of anyone who had a problem with the standard centre plate before they had a problem with the standard gears - the plate generally just gets replaced for safety when the gearset is upgraded.

As for the gearsets, its not like they are OK at 600Nm and break at 601. Their longevity is a combination of how much torque you are making and how gentle you are on shifts (or not). 

[cosline]

I thought it could be an issue because the standard plate was flexing when stressed.

Maybe the original gear set will hold a bit better without flex?

Last time on the dyno it made around 670nm at the hubs. Now it have bigger turbo and better intake but have not been on a dyno yet.

The car is being used from family trips to drag race events. So the shifts can be a little violent.

It is grinding if I shift to fast so was thinking I should overhaul it soon.

[GTSBoy]

1 hour ago, cosline said:

Last time on the dyno it made around 670nm at the hubs. Now it have bigger turbo and better intake but have not been on a dyno yet.

The car is being used from family trips to drag race events. So the shifts can be a little violent.

It is grinding if I shift to fast so was thinking I should overhaul it soon.

You're already well into "gearbox is a consumable" territory there. A billet plate will either make it (effectively) 1% stronbger or make it last one more pass. At some point you'll probably tear 3rd gear into small chunks and regret all the life decisions that came before it.

[cosline]

23 minutes ago, GTSBoy said:

You're already well into "gearbox is a consumable" territory there. A billet plate will either make it (effectively) 1% stronbger or make it last one more pass. At some point you'll probably tear 3rd gear into small chunks and regret all the life decisions that came before it.

Ah, that was not the answer I was hoping for. Is it only third gear that is the weak spot? 

Or do you have to change the whole gearset to make it hold some power?

[GTSBoy]

3rd gear is the most common failure. There is no good idea that contains "just upgrade 3rd gear" in it anywhere.

[cosline]

Ok.

What is the go to transmission upgrade that can handle some abuse with around 700nm at the hubs?

Must be quiet gears as the car is being street used.

[Piggaz]

There isn’t really a cheap upgrade here. If someone made a decent, bolt in 6 speed that holds some grunt, it would do very well.

The 5 speeds suck. You can put a

- OSG 5 speed gear set into it. Ratios are tall so it zaps the “zing” out of it. Had one, busted it.

- PPG 5 speed gear set synchro or dog’s. Ratios are even taller.

- An overpriced Getrag. Nice to drive, expensive to source now.

- A sequential of some sort. Expensive, very expensive.

How many times do you pop a 5 speed before you throw the toys out of the cot?

 

[Erelyes]

I thought I'd heard rumor of someone that was developing a 6 speed kit to convert the 5 speed box. But maybe I was thinking of the PPG 6 speed sequential? That's about half the price of a car...

 

[Piggaz]

35 minutes ago, Erelyes said:

I thought I'd heard rumor of someone that was developing a 6 speed kit to convert the 5 speed box. But maybe I was thinking of the PPG 6 speed sequential? That's about half the price of a car...

 

And this is the the thing with a high powered, AWD, heavy car. The engine is easy, the driveline costs just as much as the engine. 🤷‍♂️

Welcome to GTRland.

Whatever you think your budget is, double it.

Whatever you think your timeline is, triple it.

[joshuaho96]

7 hours ago, Piggaz said:

There isn’t really a cheap upgrade here. If someone made a decent, bolt in 6 speed that holds some grunt, it would do very well.

The 5 speeds suck. You can put a

- OSG 5 speed gear set into it. Ratios are tall so it zaps the “zing” out of it. Had one, busted it.

- PPG 5 speed gear set synchro or dog’s. Ratios are even taller.

- An overpriced Getrag. Nice to drive, expensive to source now.

- A sequential of some sort. Expensive, very expensive.

How many times do you pop a 5 speed before you throw the toys out of the cot?

 

Isn't there a PAR engineering gearset that has closer to stock ratios? And they claim they'll do whatever ratios you want.

[cosline]

8 hours ago, Piggaz said:

There isn’t really a cheap upgrade here. If someone made a decent, bolt in 6 speed that holds some grunt, it would do very well.

The 5 speeds suck. You can put a

- OSG 5 speed gear set into it. Ratios are tall so it zaps the “zing” out of it. Had one, busted it.

- PPG 5 speed gear set synchro or dog’s. Ratios are even taller.

- An overpriced Getrag. Nice to drive, expensive to source now.

- A sequential of some sort. Expensive, very expensive.

How many times do you pop a 5 speed before you throw the toys out of the cot?

 

Yeah, saw the ratios, not impressed. Would like the punch I have in the first gears now. With those ratios it won't be the same. 

Also want the h pattern gearing, or at least a quiet gear set that don't need to come apart for service each year.

Looks like the only "reasonable" way Is a 8hp70 transmission, but where is the fun in that🤷‍♂️

[r32-25t]

Wouldn’t touch par if they gave it to me.

You need to ask how much power you’re looking to make and then add about 50% to it because that’s what you’ll end up making 

The factory box says no more at about 350kw or so, the upgraded synchro boxes won’t handle much over 500kw for long and at that point you’re looking at an auto or dog engagement manual, 

once you’ve gone dog engagement you may as well go sequential, they cost a little bit more but it’s worth it 

also while you’re at it you should upgrade the transfer case with 10 friction plates 

[cosline]

How many of you guys run the synchro os giken set and at what power?

Do you then also use the billet plate? 

How is it launching with it, any dragy times from 0-60? 60ft?

[r32-25t]

Piggaz had one and broke it at 470kw 

[cosline]

7 hours ago, r32-25t said:

Piggaz had one and broke it at 470kw 

Do you know if he had a plate on it? What use did it see before it broke?

[r32-25t]

Yes it had the billet, street use 

[cosline]

Was that 470kw at the wheels? Do you know how much torque? 

Was it third gear that let go?

[Piggaz]

Busted a pretty new stock S3 box with 370 rwkw. 3rd gear was stripped bear.

OSG gear set with a plate. Busted a tooth off in 2nd.  Roughly 770 nm/472 kw atw.

Nismo coppermix clutch used in both setups.

 

 

[cosline]

7 hours ago, Piggaz said:

Busted a pretty new stock S3 box with 370 rwkw. 3rd gear was stripped bear.

OSG gear set with a plate. Busted a tooth off in 2nd.  Roughly 770 nm/472 kw atw.

Nismo coppermix clutch used in both setups.

 

 

Oh. Did it last long before it broke?

What trans did you end up with after that?