Extra power / gearbox ,clutch

[verba1]

I had a remap to my 3r with yellowshed a couple of months ago . Only a small increase in power to 383bhp and 403 lb/ft torque . I was wondering if anybody has had any gearbox or clutch problems ( both standard ) with this level of torque ? I am just wondering how safe it is ?
The car is only used on road at the moment .

Cheers for any comments.
stefano

[verba1]

yes it's got LSD . What's the max standard clutch and box can take on a 3Litre

[verba1]

mrpbailey said:

My gearbox failed when running something like 407bhp & 405lbft

6 speed with LSD ? was the car being driven hard at the time when it failed ie on track ? and what failed ?
cheers

[verba1]

mrpbailey said:

yes 6 speed & lsd. Car had been sat in the garage for 6 weeks, took it out for a drive and was really rough/hesitant through 5th gear, wasn't being driven hard, and not a spectacular failure but Jetstream diagnosed as gearbox on its way out.

Car is used on track fairly often tho.

Did you have any problems with the clutch at these levels ?

[verba1]

mrpbailey said:

Nope, tho the clutch was upgraded while the box was out, due to going up to 500bhp

How much is an upgraded clutch and box refurb these days , all in ?

[verba1]

mrpbailey said:

Fitted? Probably about £3k

Is that just for the clutch including labour and vat ?

[verba1]

wessexrfc said:

I'm just going through this now after my standard box let go. I was running about 420bhp with about the same torque. I've upgraded the clutch and gone for the strengthened gear box c/w oil cooler and lightened fly wheel (thanks Andy). I will try to update once the car is back on the road with the costs. Reasons for doing this? Reliability, and looking to take the car to a "safe" 500bhp ish.

sounds good , I'm just trying to gauge if it's track work or the way one drives to see why at 400lb/ft Torque which is supposedly still to be 'safe' ( 3r in my case ) that a lot of people are breaking 5th gear and the clutch seems to end up slipping ..

[verba1]

MART3R said:

Mine st it's self at 400ft 414bhp. At donnington the other week in the second session.
Sounds like main shaft as the clanging stops when I press the clutch in. Only a 10k car to!

Martin What do you think was the main reason for the failure ?

[verba1]

Guys thanks for the input very interesting reading.

I'm referring more to in my case a standard 6 speed box ( non strengthened ) only used on road . It has been on standard power for over 3 years and has recently been remapped to 380 bhp 400 lb/ft and i'm just wondering, as quite a few boxes at these torque levels are breaking , if it's worth taking the torque down as i don't really want to go through all the hassle and expense of getting it repaired if you see what i mean .