R34 GTR gearbox into R32 GTR

[GTR32]

Does anyone know if this can be done within reason and if so, whether final drive ratios have to be changed to retain driveability ie engine / gearing match characteristics?

Thanks

[DAN00H]

it is the same engine, gearbox has an extra gear, do a search on the ratios. from memory all the GTRs run a 4.11:1 diff ratio. you may need the 34 box of sparks as well. do you haev an 89' that lunched the engine?

[Simmo]

Hi mate I'm not sure on the exact reason behind your question but I'm told the 34 gearbox isn't all that strong???

The series 3 R33 gearbox is supposed to be the pick of the bunch for strength.

Simmo

[wreckedhead]

like simmo i was told something but i know for a fact that the r32 box, in good condition can withstand more punishment then any other model. basically all the same shit really.

[benjiman74]

wreckedhead - the r32 box doesn't even have the upgraded synchros that came with r33 series 2 & 3 boxes

[GTR32]

Hi mate I'm not sure on the exact reason behind your question but I'm told the 34 gearbox isn't all that strong???

The series 3 R33 gearbox is supposed to be the pick of the bunch for strength.

Simmo

Hi Simmo;

The reason? I want to see if it's worth doing, and not just for the extra gear. Found out g'box ratios today but it appears that while R32/33 had 4.11 diffs, R34 has 3.54 which means Nissan had something else in mind for a gear ratio / engine match. I don't have my gear ratio ready reckoners handy (moving house) so I can't work out what final result I'd have using the R34 ratios. I think once I unearth them I'll do some calcs and work it out that way.

Thanks

[GTR32]

it is the same engine, gearbox has an extra gear, do a search on the ratios.  from memory all the GTRs run a 4.11:1 diff ratio. you may need the 34 box of sparks as well. do you haev an 89' that lunched the engine?

Hi DAN00H;

No, thankfully that's not me.

[Merli]

Hi Simmo;

The reason? I want to see if it's worth doing, and not just for the extra gear. Found out g'box ratios today but it appears that while R32/33 had 4.11 diffs, R34 has 3.54 which means Nissan had something else in mind for a gear ratio / engine match. I don't have my gear ratio ready reckoners handy (moving house) so I can't work out what final result I'd have using the R34 ratios. I think once I unearth them I'll do some calcs and work it out that way.  

Thanks

Whilst this is true (about the different diff ratios), you must remember that the R34 version of the RB26DETT makes a lot more power than the R32/R33 version. Even though they're still rated at 206kw, it is regularly seen that dead stock R34 GTRs are spinning up in excess of 220-230kw @ all four wheels on the dynos.

[markr34gtr]

my r34 gtr gearbox is running 400rwhp and no worries as yet...

7000rpm launches etc... no funny noises yet....

i think it depends on the driver also how long they last....

cheers...

[GTR32]

Whilst this is true (about the different diff ratios), you must remember that the R34 version of the RB26DETT makes a lot more power than the R32/R33 version. Even though they're still rated at 206kw, it is regularly seen that dead stock R34 GTRs are spinning up in excess of 220-230kw @ all four wheels on the dynos.

Merli;

Good point. My 32 will have about 275 4wkw and hence some of the flexibility that the R34 has in that respect. I guess it would then be logical to look into changing the diff centres...oh no here we go down the black hole again...

The whole business of matching engine torque curves to gears etc is so complex I'll probably leave the whole thing alone, but I still want to explore the possibilities because it might yield some real benefits.

Sounds like something Sydneykid might be able to help with.

Regards

[Duncan]

Well if you want to calculate the ratios I've got a calculator at http://www.hgeconsulting.com.au/carspeed.xls

[Hattori Hanzo 69]

near on 10 year thread bump

anyone done this and got some advice / ball park cost?

[Aggroman]

Nismo do a kit. Look it up

[Piggaz]

You'll need a different flywheel for starters and tail shaft.

As Dave said, you can buy a kit. With the exchange rate ATM it'll be about $9,000 give or take.

[(OO)SKYLINE(OO)]

Nismo's Transmission Conversion Kit:

http://www.nismo.co.jp/products/catalogue/#page=123

[R31Nismoid]

It's been covered before - no need for a 10yo bump

Thread was last year, went into full detail. End of the day, it's cost ineffective.