very noticeable drivetrain shunt ?
Discussion
in a 07 exige S, 45k miles.
it is much, much worse than the shunt in my 00 xantia with 170k miles for example.
no clutch slippage, same level of shunting going on regardless of gear / speed.
what should i be looking at : clutch bearing, engine / gearbox mounts, shafts, bearings ?
there is no vibration or any other kind of issue, btw.
the car is headed to oakmere next week for the engine tweakery and they know to look at this but it would be nice to have an idea in advance in case anything special needs to be ordered up.
it is much, much worse than the shunt in my 00 xantia with 170k miles for example.
no clutch slippage, same level of shunting going on regardless of gear / speed.
what should i be looking at : clutch bearing, engine / gearbox mounts, shafts, bearings ?
there is no vibration or any other kind of issue, btw.
the car is headed to oakmere next week for the engine tweakery and they know to look at this but it would be nice to have an idea in advance in case anything special needs to be ordered up.
It could be any of those things, but I'd look first at engine mounts and driveshaft CVs, but seems odd for an 07 model, despite highish mileage - didn't think things went that soon.
Not sure on the Exige S engine & gearbox mounts, but the NA ones are fairly crap - recently fitted powerflex inserts into ours at 33K miles on a 54 car as the engine was wobbling around like a lump of jelly in the back!
Has the car been used much on track?? Is it standard or tuned? Cars running 300bhp+ can have gearbox problems.
Any other noises?
Can you clarify what you mean by 'shunt' - Does it just knock/shudder on and off power?
Not sure on the Exige S engine & gearbox mounts, but the NA ones are fairly crap - recently fitted powerflex inserts into ours at 33K miles on a 54 car as the engine was wobbling around like a lump of jelly in the back!
Has the car been used much on track?? Is it standard or tuned? Cars running 300bhp+ can have gearbox problems.
Any other noises?
Can you clarify what you mean by 'shunt' - Does it just knock/shudder on and off power?
no other noises, vibrations, etc. just a delayed sort of 'mechanical re-engagement' if you quickly release the throttle on the move. delay is maybe half a second or so. it's a lot more noticeable than on any other car i drive or have driven, including for example my 170k mile xantia which does not get a lot of TLC.
car gets a fair bit of track action and is unmodified apart from dampers brakes and a k&n. none of what i'd call clutch abuse though - i don't do standing starts or 0-60 timings etc, just regular track day driving.
the pressure-release bearing in the clutch has been mentioned to me already.
car gets a fair bit of track action and is unmodified apart from dampers brakes and a k&n. none of what i'd call clutch abuse though - i don't do standing starts or 0-60 timings etc, just regular track day driving.
the pressure-release bearing in the clutch has been mentioned to me already.
aceofspades said:
no other noises, vibrations, etc. just a delayed sort of 'mechanical re-engagement' if you quickly release the throttle on the move. delay is maybe half a second or so. it's a lot more noticeable than on any other car i drive or have driven, including for example my 170k mile xantia which does not get a lot of TLC.
car gets a fair bit of track action and is unmodified apart from dampers brakes and a k&n. none of what i'd call clutch abuse though - i don't do standing starts or 0-60 timings etc, just regular track day driving.
the pressure-release bearing in the clutch has been mentioned to me already.
I'd look at engine mounts like others have said. An 'off the wall' thought though, I wonder if the throttle is sticking momentarily or the MAF not sending or receiving signals properly, that could give an 'odd' drive train shunt under sudden lift-off...car gets a fair bit of track action and is unmodified apart from dampers brakes and a k&n. none of what i'd call clutch abuse though - i don't do standing starts or 0-60 timings etc, just regular track day driving.
the pressure-release bearing in the clutch has been mentioned to me already.
so: it turned out all the mounts were in perfectly good shape. the problem was the air intake (K&N Typhoon) had rotated on its mount such that it was resting on a bracket. each time the engine moved under sudden acceleration/deceleration, the intake would press against the bracket and lose flow momentarily. now re-positioned, normal service has resumed.
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