29-01-2010, 10:39 PM | #11 |
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my first clutch was changed due to slur
second one has started to do it now and bmw are monitoring it it is when the car is under heavy load when changing gear |
29-01-2010, 10:56 PM | #12 |
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30-01-2010, 01:08 PM | #13 |
S5 - Full Throttle
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If you time it right a slight lift on upchanges is quicker than a full throttle shift.
Seemed to work for me in the CSL Cup races |
30-01-2010, 01:09 PM | #14 |
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30-01-2010, 01:15 PM | #15 |
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John, do you run updated clutch and flywheel in your Cup car last year?
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30-01-2010, 01:18 PM | #16 | |
S4 - Getting the hang of it
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Quote:
At what point did you lift? Just before, bang on or just after you clicked to shift? |
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30-01-2010, 03:55 PM | #17 |
S5, Sport Off, DSC M-track
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Hi,
I have always slightly backed off the Throttle, when changing gear, and find its much better. Smoother, quicker, and less issues. Plus you do not transmit such aggressive shock loads through the Transmission drive train. I believe all SMG 2 cars suffer some clutch slur under heavy load, when warmed up, its just that some drivers are better than others at actually detecting it at full chat. If you 'feather' your throttle pedal inputs when driving the bends on circuit, ala the Senna / Schumacher club, even on a CSL with SMG updates, you can actually get ahead of the E.Gas [fly by wire] to the point where the throttle pedal is being dabbed, but the engine is no longer actually responding to the inputts. ie, Throttle pedal is lifted but engine is still increasing revs. Then go drive a S54 with a throttle cable, not E.Gas and its a whole new world. I think that some clutch slur is detected when under load you have up-shifted quickly but the stepper motor activated by the throttle pedal petom are to a point still catching up, so the ECU/DME 'hangs' for a split second which gives the impression of clutch slur, or a slight delay on upshifts, as its not instant. As the CSL works on a Throttle load input, no MAF, this combined with E.Gas, is I beleive more to do with slow shifts or perceived 'clutch slur', than the actual clutch, until the clutch is actually nearing its life cycle end. This is borne by the claim, that 'clutch slur' can in part be rectified by driving hard' Regards, The Gorilla. |
30-01-2010, 05:33 PM | #18 | |
Driving it like I nicked it
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Quote:
Unless ABSOLUTELY FLAT OUT in either 4th gear or upwards I always slightly lift as well, was told to do this when I bought it and it would change better, and IMO it does |
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30-01-2010, 06:32 PM | #19 |
S4 - Getting the hang of it
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31-01-2010, 11:57 AM | #20 |
S5, Sport Off, DSC M-track
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Sadly it's not caused by driving style, otherwise we could prevent it. It's caused by shit design. It's the only thing I really HATE about CSL, and it's been bugging me since 2003 so it's a good job I really like the rest of the car
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