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R34 GTR gearbox into R32 GTR

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GTR32 Rising Star

GTR32

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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

Merli Grand Master

Merli

Posted
Posted
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.

GTR32 Rising Star

GTR32

Posted
  • Author
Posted
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

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