V8V - clutch question
V8V - clutch question
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Hillbilly75

Original Poster:

34 posts

145 months

Monday 2nd November 2015
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Once the fog had cleared, it was a sunny day on Saturday. The thought of sitting at home was criminal so decided to take the V8 into Wales for a jolly good spanking. The drive was quite frankly epic, including my first ever moment of unintentional air over a hump back bridge; good job she is firmly sprung!

Whilst making progress I had a brief moment to despatch a carvanist, so slammed the V8 into 3rd and floored it. When I did, I noticed the revs shot up as you would expect but there was a momentary disconnect between the revs rising as I accelerated and the car moving; by all accounts it felt like clutch slip. Now I usually drive reasonably sensibly, by this of course I mean, anyone with wedding veg likes it, anyone with a front bottom, looks white and holds on for dear life. So quickly, but not stupid. I am aware clutches should be treated with respect and wouldn't dream of slamming the clutch in unless I have to.

My V8 is a manual and the bite point on the clutch has stayed consistent for 5,000 miles, and by all accounts it feels in excellent condition pulling consistently in all gears. I have had no issues with the car so far. I have never tracked the V8 but it has been to Germany and back with a good mixture of fast twistys and motorway cruising.

Initially, I thought it was a one off, however, something similar happened the following day, albeit in similar circumstances, when I had to quickly grab 3rd from 6th to get a cheeky overtake done. This time it felt like a power flat spot for 1 second or so, then it was fine.

Anyone else had similar experiences of theories?

Jon39

14,959 posts

173 months

Monday 2nd November 2015
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If your clutch has begun to slip, you would of course now be able to make it slip whenever you want to (up hill, high gear, accelerate).

My guess is that it might be something that I have had on a couple of occasions, and it has been mentioned here before, although I cannot remember the suggested technical background. Simply a brief misfire making the engine hesitate, at the begining of heavy acceleration. It was two years ago that I experienced it, but it has never done it since.

It will either cost you £3,000 or nothing at all. Here's hoping.

V8V Pete

2,536 posts

156 months

Monday 2nd November 2015
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Sounds like slipping clutch to me I'm afraid. How old is the car and how many miles has it done? As Jon says, put it in 3rd or 4th at lows revs and floor the throttle. If your clutch is beginning to slip this will reveal it.

Hillbilly75

Original Poster:

34 posts

145 months

Monday 2nd November 2015
quotequote all
Thanks guys. So in 3rd and 4th, booting from low revs is fine, picks up as normal and behaves as you would expect. Hill starts fine, reversing fine. I was driving a Citroen Synergie (not mine) once that had severe clutch slip that failed on me whilst on the M6, so I am at least familiar with the signs of a french clutch surrendering and this was different. Car is on about 28k and as far as I know it is the original clutch, to be honest, it really does feel strong.

Am going to the McGurk do in December and have thrown my hat in for the free health check, will be interesting if they spot anything generally around the car that might give an indication.

My only bind at the moment is I am under AMW Warranty until March so if there is something wrong that is covered, I want to get it looked at before that expires, that said, we all know the fun and games with intermittent issues.

divetheworld

2,565 posts

165 months

Monday 2nd November 2015
quotequote all
I've always tested a clutch thus:
Put it in 2nd at just below the power band and press the brake and accelerator pedal together. If the brakes can hold the car back (or stall) without revs lifting then the clutch is good.

V8V Pete

2,536 posts

156 months

Tuesday 3rd November 2015
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Well if your clutch is fine then alternative explanations could be a moment of wheel-spin for the first episode and a moment of DSC intervention for the second. Did the DSC light on the dash illuminate at the time?

gibbon

2,182 posts

237 months

Tuesday 3rd November 2015
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Sounds like DSC to me. I've also been told that the dsc can gently intervene without the light indicating so, i also dont find the light particularly attention grabbing personally.

Hillbilly75

Original Poster:

34 posts

145 months

Tuesday 3rd November 2015
quotequote all
Thanks chaps, no DSC light came on that I spotted, I have had it on before so think I would spot it. Will keep an eye on it.

gibbon

2,182 posts

237 months

Tuesday 3rd November 2015
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Hillbilly75 said:
Thanks chaps, no DSC light came on that I spotted, I have had it on before so think I would spot it. Will keep an eye on it.
Turn it off, and see if you can get the car to behave in the same way, that will rule that out, minding you dont stick it in a ditch of course!

Jon39

14,959 posts

173 months

Tuesday 3rd November 2015
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gibbon said:
Sounds like DSC to me.
... I also dont find the light particularly attention grabbing personally.

I had to chuckle at your comment.
Whenever my DSC light comes on, I also tend not to notice it.
The reason I do not see it, is at that moment I am rather busy looking at the road ahead, but I know the system has activated, by feeling the sideways jolt after the tyres have lost grip.

In this topic though, I think you are suggesting loss of grip during straight line acceleration, not whilst cornering.




Edited by Jon39 on Tuesday 3rd November 13:40

gibbon

2,182 posts

237 months

Tuesday 3rd November 2015
quotequote all
Jon39 said:

I had to chuckle at your comment.
Whenever my DSC light comes on, I also tend not to notice it.
The reason I do not see it, is at that moment I am rather busy looking at the road ahead, but I know the system has activated, by feeling the sideways jolt after the tyres have lost grip.

In this topic though, I think you are suggesting loss of grip during straight line acceleration, not whilst cornering.




Edited by Jon39 on Tuesday 3rd November 13:40
Sorry, maybe im being a bit slow. Why the chuckle?

Jon39

14,959 posts

173 months

Tuesday 3rd November 2015
quotequote all

My chuckle was because, when tyre grip is about to be lost, I never have time to look down at the dashboard and see the DSC light.

When my DSC light is about to come on, all of my concentration would be on the rapidly moving scenery through the windscreen. Hence my comment that I don't see the light, but know the DSC has engaged by having felt the jolt.



Edited by Jon39 on Tuesday 3rd November 17:09

gibbon

2,182 posts

237 months

Wednesday 4th November 2015
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Jon39 said:
My chuckle was because, when tyre grip is about to be lost, I never have time to look down at the dashboard and see the DSC light.

When my DSC light is about to come on, all of my concentration would be on the rapidly moving scenery through the windscreen. Hence my comment that I don't see the light, but know the DSC has engaged by having felt the jolt.



Edited by Jon39 on Tuesday 3rd November 17:09
Ah, yes, exactly. I also dont find the 'shift light' of much use at all.