Carbon propshafts worthwhile?
Discussion
The prospect of losing less engine power to the drive-train, having the power directed to the wheels more quickly and of course reducing the car's weight (albeit raising the c of g a bit) seems appealing. Would this be a waste of money of a sensible modification on an already highly modified classic Impreza?
yer pays yer money and takes yer choice.
I can see it making a small difference if you were chasing and extra 100th on the drag strip but for day to day driving I can't see it helping much.
To get the best out of a teg you have to be revving the nuts off it anyway and reduced 'spool up time' and increased responsiveness probably isn't going to be felt under normal driving conditions. Arguably you could say the reduced rolling mass of the wheels and drive shafts may have a negative effect as well as a positive one.
If its already highly modified then like most people you will reach the point of diminishing returns, its just a question of how far your pockets allow you to go, and whether there are other products out there that will add more effect per £.
I can see it making a small difference if you were chasing and extra 100th on the drag strip but for day to day driving I can't see it helping much.
To get the best out of a teg you have to be revving the nuts off it anyway and reduced 'spool up time' and increased responsiveness probably isn't going to be felt under normal driving conditions. Arguably you could say the reduced rolling mass of the wheels and drive shafts may have a negative effect as well as a positive one.
If its already highly modified then like most people you will reach the point of diminishing returns, its just a question of how far your pockets allow you to go, and whether there are other products out there that will add more effect per £.
sparkyhx said:
yer pays yer money and takes yer choice.
I can see it making a small difference if you were chasing and extra 100th on the drag strip but for day to day driving I can't see it helping much.
To get the best out of a teg you have to be revving the nuts off it anyway and reduced 'spool up time' and increased responsiveness probably isn't going to be felt under normal driving conditions. Arguably you could say the reduced rolling mass of the wheels and drive shafts may have a negative effect as well as a positive one.
If its already highly modified then like most people you will reach the point of diminishing returns, its just a question of how far your pockets allow you to go, and whether there are other products out there that will add more effect per £.
I think you might be confusing prop shafts with driveshafts. On a 4WD drive car replacing the propshaft with a carbon one can make quite a lot of difference to the driveability of the car. I know people who have them and they say for the money spent it's one of the most effective mods they've made.I can see it making a small difference if you were chasing and extra 100th on the drag strip but for day to day driving I can't see it helping much.
To get the best out of a teg you have to be revving the nuts off it anyway and reduced 'spool up time' and increased responsiveness probably isn't going to be felt under normal driving conditions. Arguably you could say the reduced rolling mass of the wheels and drive shafts may have a negative effect as well as a positive one.
If its already highly modified then like most people you will reach the point of diminishing returns, its just a question of how far your pockets allow you to go, and whether there are other products out there that will add more effect per £.
hewlett said:
The prospect of losing less engine power to the drive-train, having the power directed to the wheels more quickly and of course reducing the car's weight (albeit raising the c of g a bit) seems appealing. Would this be a waste of money of a sensible modification on an already highly modified classic Impreza?
The rotational inertia of a prop shaft is very small indeed, it doesn't seem like a very likely place to make performance improvements. I expect it will be hideously expensive though. I would guess the main reason to go for an ultralight stiff prop shaft would be to avoid the shaft whipping if you were having trouble with a conventional prop shaft flexing.Thanks a lot Vixpy, well amazingly a friend who's in the AA had a look at the car yesterday and after some fiddling, replaced a pipe (I should have got details) and the car is now running well. It still has about 700 miles to go until the pistons are run in so my current plans are to get it run in, then bring it down for some proper mapping. The plan was to get it running so I could run it in, then get it mapped but with some free help I've leapfrogged the first requirement. Although I phoned and emailed (and visited) GRD last week I didn't hear back about this week so assumed that the car wasn't going into the rroad this week after all. As that session is definitely on I will email James and let him know that I'll need to come back down when it's run in. Thanks for your help and advice on this forum, I will see you when your next Subaru day is post the car being run in.
Wise advice thanks, you're right I think the fuelling is a little all over the place as still with the slightest wiff of boost it runs lumpy so I stay well away from invoking forced induction! The exhaust pipe is full of soot and I read somewhere that that could mean its running lean.
sparkyhx said:
yer pays yer money and takes yer choice.
I can see it making a small difference if you were chasing and extra 100th on the drag strip but for day to day driving I can't see it helping much.
To get the best out of a teg you have to be revving the nuts off it anyway and reduced 'spool up time' and increased responsiveness probably isn't going to be felt under normal driving conditions. Arguably you could say the reduced rolling mass of the wheels and drive shafts may have a negative effect as well as a positive one.
If its already highly modified then like most people you will reach the point of diminishing returns, its just a question of how far your pockets allow you to go, and whether there are other products out there that will add more effect per £.
Sorry ignore me I got the wrong end of the stick - I read Integra not Impreza - I did wonder why he had refered to prop shaft .......dohI can see it making a small difference if you were chasing and extra 100th on the drag strip but for day to day driving I can't see it helping much.
To get the best out of a teg you have to be revving the nuts off it anyway and reduced 'spool up time' and increased responsiveness probably isn't going to be felt under normal driving conditions. Arguably you could say the reduced rolling mass of the wheels and drive shafts may have a negative effect as well as a positive one.
If its already highly modified then like most people you will reach the point of diminishing returns, its just a question of how far your pockets allow you to go, and whether there are other products out there that will add more effect per £.
Edited by sparkyhx on Monday 11th June 12:25
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