Hi all
Does anyone know of any manual gearboxes that would cope with big block power + torque?
It wont be used in a usual front wheel drive application but i need that type of box
Failing that what transverse box would be ok with approx 300bhp RV8?
Cheers
James
Transverse gearbox strong enough for big block / RV8???
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If it is up to about 550 bhp and about 450 ftlb torque then the Renault 25 turbo box can be beefed up to this level, it needs a new input shaft and a beefed up and bearings around 5th gear, one of the gt40 kit makers do kits, I'll have a hunt later (unless Ian Anderson knows off the top of his head).
The Audi ally case 5 speed (same one as the Porsche boxter but if it says Porsche it costs about £750 more) is good for about 50 less but also can be beefed up to about the same (I have one for my SBC)
the six speed for the 2 WD 3.7 diesel Audi A8 is meant to be able to handle 500 but are not easy to get in the UK ftlb and the boxter S version about 450 or so.
The Porsche G50 series are good up to around 600 bhp if cooled suitably (but only 500-550 ftlb) and need to be in good condition. the early 911 boxes are much weaker.
Then there are 5 and 6 speed Quaif boxes, rated for big numbers (850 bhp and 750 ish ft lb) and a few ZFs similar but a bit less torque. and then you get to hewland boxes, the highest rated would handle a racing big block.
As for transverse boxes the one for the 2.5 litre rover 5 speed and pugeot diesel 6 speed are good for about 600 bhp 450-500 ft lb if in good nick.
With a tuned big block you will be looking at spending big money on a transmission £5k to £7.5k by you have reconditioned it and beefed it up, even a low tune one you will be in for £2.5k by it is reconditioned and modified, the torque is the killer, a 300bhp big block will have over 450 ft lb of torque
Best regards
Mike
The Audi ally case 5 speed (same one as the Porsche boxter but if it says Porsche it costs about £750 more) is good for about 50 less but also can be beefed up to about the same (I have one for my SBC)
the six speed for the 2 WD 3.7 diesel Audi A8 is meant to be able to handle 500 but are not easy to get in the UK ftlb and the boxter S version about 450 or so.
The Porsche G50 series are good up to around 600 bhp if cooled suitably (but only 500-550 ftlb) and need to be in good condition. the early 911 boxes are much weaker.
Then there are 5 and 6 speed Quaif boxes, rated for big numbers (850 bhp and 750 ish ft lb) and a few ZFs similar but a bit less torque. and then you get to hewland boxes, the highest rated would handle a racing big block.
As for transverse boxes the one for the 2.5 litre rover 5 speed and pugeot diesel 6 speed are good for about 600 bhp 450-500 ft lb if in good nick.
With a tuned big block you will be looking at spending big money on a transmission £5k to £7.5k by you have reconditioned it and beefed it up, even a low tune one you will be in for £2.5k by it is reconditioned and modified, the torque is the killer, a 300bhp big block will have over 450 ft lb of torque
Best regards
Mike
poppet valves rule!
