Power Limit of the 5-speed box

Has anyone gone single with a 5-speed box and is running near 500bhp mark??

Was wondering what the capabilities are, and if its worth doing when I get my single project up and running, im auto now

Might have to get a ride out in an auto to see what there like with a single first....might change my mind

5 speed box as in 5 speed NA manual box?

yeah

Im sure Cj had a single turbo car with a 5 speed gear box. PM him

I spoke to him about it but he was unsure how much abuse the box could take

posted on supra forums as well, hope I do better than last time

Mine is holding up so far:thumbs: running a Precision T61 at 0.8 bar around 400fwhp going for 500 early next year, I would do a six speed swap though if you are going to the trouble of swapping auto to manual

It won't like the torque one little bit. It may last a while, but it'll be on a knife edge.

It won't like the torque one little bit. It may last a while, but it'll be on a knife edge.

Chris how about the R154 box from the 1JZ and the with 1jz bellhouse?? are there any other box's apart from the 6-speed that are worth looking at, im not worried about high speed runs??

AFAIK they both have similar torque handling ability. Easiest swap is the six speed Getrag from the TT Supra MKIV, otherwise there are umpteen other boxes, but they would need a lot of custom made bits to use them.

Hmm Thought that might be the case...how about borg warner T5 box's I was offerend one of these a while back but was unsure?

A T5 with Glebe dog box, straight cut internals would be OK, but horrible as a road gearbox. That's the box I intend to bung in my RWD Skyline. As standard it wouldn't be up to it, in theory. A Corvette box would be OK, if you made a bellhousing adaptor, prop, clutch and release package, rear mount, gear lever, blah blah. None even come close, cost wise, to a simple swap to a TT Supra gearbox, clutch and stuff.

A T5 with Glebe dog box, straight cut internals would be OK, but horrible as a road gearbox. That's the box I intend to bung in my RWD Skyline. As standard it wouldn't be up to it, in theory. A Corvette box would be OK, if you made a bellhousing adaptor, prop, clutch and release package, rear mount, gear lever, blah blah. None even come close, cost wise, to a simple swap to a TT Supra gearbox, clutch and stuff.

I think the 6-speed is looking more likely, only problem is sourcing one, there very hard to get hold off, I had an opportunity to purchase one at a good price but money as always is the limiting factor at the moment!!

Buy a cheap complete car and break it? I would break loads, but Jane insists she won't live in a scrap yard....

Buy a cheap complete car and break it? I would break loads, but Jane insists she won't live in a scrap yard....

I get exactly the same from my other half unfortunatly, I have thought about this route and its probably one I will end up taking,

Thanks fot the advice Chris

How similar is the getrag from a mitsy gto?

Probably not very, but I don't know, despite my wife liking the look of the things, (no accounting for lack of taste.... ), I have never had any dealings with them save to make a repair kit for their troublesome 4WD transmission input shaft problem. Sorry I'm not much help to you there.

The R154 is a good bit stronger than the W58 from what I've read. Checkout US Supra forums for more info on this and the conversion kit boostlogic offer to fit this box.

IIRC the W58 is marginal above 350lb/ft torque - depends what kinda abuse you give it. The R154 is apparently good for 500lb/ft torque.

Cheers,

Brian.