Driveshaft toughening
Discussion
Ive managed to snap a few driveshafts in my IRS TVR Chimaera.
I am a regular at the drag strips and use Mickey Thompson street radials and nitrous oxide.
So i have plenty of grip and power but the standard driveshafts cant take a full power launch.
I approached Dave Mac to have a pair of so called indestructable ones made up but the quote was twice that i expected.
Are there any other manufacturers? Or maybe I could get my current shafts heat treated in some way.
All ideas appreciated. I need to get this sorted before the first race meeting at Easter.
I am a regular at the drag strips and use Mickey Thompson street radials and nitrous oxide.
So i have plenty of grip and power but the standard driveshafts cant take a full power launch.
I approached Dave Mac to have a pair of so called indestructable ones made up but the quote was twice that i expected.
Are there any other manufacturers? Or maybe I could get my current shafts heat treated in some way.
All ideas appreciated. I need to get this sorted before the first race meeting at Easter.
PhillipM said:
What kind of price?
£2-300 per shaft for hardened S255 is about par for the course for ours, albiet they're pretty long (30"+) and have 6" of spline engagement on the CV's to cut.
The shafts were quoted at £295 each + VAT so not far from that i guess.£2-300 per shaft for hardened S255 is about par for the course for ours, albiet they're pretty long (30"+) and have 6" of spline engagement on the CV's to cut.
There were also 4 CV joints at £49 + VAT each so the bill came to £943 + delivery.
I am considering trying cryogenic treatment of my current shafts
Its the standard TVR driveshaft that i have been breaking. Luckily i have managed to find replacements for beer tokens upto now.
I have over 500 bhp at my disposal with the nitrous but can only give the launch a 'blip' of stage 1 in first gear. Probably about 350bhp, anymore breaks the shaft. Once away and into 2nd its fine. I have all the grip i need if i smoke the MT radials. So now i just do a mild burnout and all is fine. I can run 1.70 to 60 foot but know the car is capable of 1.5's
The BTR diff should be strong enough to cope at this level.
The T5 gearbox could be the weak link but has some modifications and is healthy at the moment.
I have ran 10.89 @ 129 and the aim is to try and get down to 10.60 to take the current TVR record which is held be an LS3 powered Cerbera.
I believe i can get there with the harder launch.
I have over 500 bhp at my disposal with the nitrous but can only give the launch a 'blip' of stage 1 in first gear. Probably about 350bhp, anymore breaks the shaft. Once away and into 2nd its fine. I have all the grip i need if i smoke the MT radials. So now i just do a mild burnout and all is fine. I can run 1.70 to 60 foot but know the car is capable of 1.5's
The BTR diff should be strong enough to cope at this level.
The T5 gearbox could be the weak link but has some modifications and is healthy at the moment.
I have ran 10.89 @ 129 and the aim is to try and get down to 10.60 to take the current TVR record which is held be an LS3 powered Cerbera.
I believe i can get there with the harder launch.
db484bhpv8 said:
Its the standard TVR driveshaft that i have been breaking. Luckily i have managed to find replacements for beer tokens upto now.
I have over 500 bhp at my disposal with the nitrous but can only give the launch a 'blip' of stage 1 in first gear. Probably about 350bhp, anymore breaks the shaft. Once away and into 2nd its fine. I have all the grip i need if i smoke the MT radials. So now i just do a mild burnout and all is fine. I can run 1.70 to 60 foot but know the car is capable of 1.5's
How about not using Nitrous in fist, just to get the car rolling then nitrous from second gear onwardsI have over 500 bhp at my disposal with the nitrous but can only give the launch a 'blip' of stage 1 in first gear. Probably about 350bhp, anymore breaks the shaft. Once away and into 2nd its fine. I have all the grip i need if i smoke the MT radials. So now i just do a mild burnout and all is fine. I can run 1.70 to 60 foot but know the car is capable of 1.5's
Could find that even quicker as your not just burning rubber off the line
NormanD said:
How about not using Nitrous in fist, just to get the car rolling then nitrous from second gear onwards
Could find that even quicker as your not just burning rubber off the line
If i do a decent burnout then there is no wheelspin whatsoever from the line no matter how much nitrous i try and introduce.Could find that even quicker as your not just burning rubber off the line
I have found the point which i can launch without breaking a driveshaft but this isnt good enough. Hence stronger shafts required.
are the TVR stock shaft not sierra items?... if so they MAY be the same as the GKN Ultima ones.. and surely there are upgraded sierra cossie items available?
Saying that the sierra didn't really ever have the kind of traction you have.
My stock ford shafts for my noble are £400 plus vat each so I kinda feel your expectation of cost may be out of align lol
Saying that the sierra didn't really ever have the kind of traction you have.
My stock ford shafts for my noble are £400 plus vat each so I kinda feel your expectation of cost may be out of align lol
If they're the 108mm PCD type sierra ones (?), just buy some Porsche 930-style joints and shafts, they use them for all sorts of offroad buggies in the states (it's what we're using), so you can can get a wide range of shaft lengths to suit and they're available in 300M material straight off the shelf, you can get tougher CV cages too.
I've an old set here but at 24" long they're probably too long to give them a try to see if they bolt up ok, they should do, the joints are very similar.
I've an old set here but at 24" long they're probably too long to give them a try to see if they bolt up ok, they should do, the joints are very similar.
Edited by PhillipM on Tuesday 20th January 16:17
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