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How To Get The Most Out Of Your Tranny

dwest
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dwest Contributor

dwest

Posted
Posted

I discovered this info from a German freind. He was 100 percent right on and save me thousands.

I had an issue with my GTS4 I was pushing 500whp for over a year. I went through 3 transmissions and was going to spend the money on a getrag. I know some of you are thinking how the hell did you get 500whp out of a GTS4 arent those RB20det? yes they are stock... I swapped in a Rb25det from a Stagea series 2 did a frankenstein wiring job and tuned it with 740cc nismo injectors, walbro fuel pump, OS giken twin plate, metal headgasket, N1 water and oil pump, custom made GT3582R turbine with a few tweaks to that and a long list of other things. The wiring harness was from all 3 RB motors, and it was tuned in Japan with a Power FC Djetro to avoid the two mafs.

Ok so back to the transmission. Here was my fix which is what my German freind suggested. I just installed doubled syncros from the R34 transmission bought directly from Nissan. Now my tranny can hold somewhere around 700+ hp...

It worked, no dig, no grind, no hard shifting, no seriouse mods no 10k on a getrag or whatever...

My stock 5 speed GTR32 tranny that I am using is well capable of high power gains. As for the heating issue I used heat dissolving dynomat all over the car to keep all heat and noise out.

I have plenty more tips but this is it for now...

femno Grand Master

femno

Posted
Posted

Modifying the synchros in your gearbox does not increase its strength.

The role of the synchros is to match the speed of the input to the speed of the output so as the gears can engage.

The gears themselves and shafts are the parts that actually transfer the power through the gearbox, not the synchros.

Birds Grand Master

Birds

Posted
Posted (edited)

Yes, as has been said, double synchros do not increase the strength of the load bearing components. If synchros are your problem, that is not a power related issue; that is driving style. Double clutching on your way down through the gears will make your synchros last longer. Also avoid high rpm downshifts. Brakes are for stopping, gears are for going...

Edited by Birds

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