r154 how strong?

[atomic rob]

has any1 had any experience with these gearboxs wat srt of pwr will they handle can they hold 300rwkw with considerate drving and wat can be done to upgrade them i have heard that the thrust bearing is a weak point

[BlackSupra]

Its the shifting that will break the box. Yes they can handle 300rwkw, just dont snap 2nd gear too hard.

[SeptemberSquall]

Power doesn't break gearboxes, torque does. A heavier car would also have an effect. What're you putting it into, and what are you putting in front of it?

Also as JCMF said, I think most gearboxes fail from abuse more than anything else.

[MR 1JZ]

ive hammered the poo out of mine for 12 months in a drift car...making 200rwkw and its still all good

the real test will be this year behind a solid centre clutch and 350+rwkw

[atomic rob]

it is in my jza70 behind a 1jz i am nt totally shore wat pwr out put is but it is runnong an a/f ratio of 12:1 on the equivalent of 500cc injectors at 100% duty cycle so im guess not far of 500fwhp at 23psi boost

[atomic rob]

oh yeah it has a spec stage3 clutch ,sprung center but very high clamping quite harsh 2 use cant remember exact specs at mo

[Norbie]

IMO the clutch has a major influence on the life expectancy of a gearbox. The stock easy-to-slip full-face organic clutch absorbs a lot of torque spikes instead of sending the shock through the drivetrain and snapping things. A solid centre button clutch on the other hand has absolutely no give in it, so the gearbox cops it.

I didn't start destroying gearboxes until I installed a button clutch. Ditto for a friend who broke several R154's behind a stock 7M-GTE after he installed a solid-centre 3-puck button clutch.

Having said that, driving style has a major influence as well. Caveman shifts + button clutch = very short gearbox lifespan!

[BlackSupra]

And if you keep strengthening components in your drivetrain eventually the gearbox will become the weakest link.

Something has to give somewhere.

[atomic rob]

cool snds like it should be ok i dnt hammer it 2 hard anyway, tyres seem 2 b the weakest link at mo