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12-08-2011, 06:23 PM | #23 | |
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This method certainly works to smooth out the low-rpm shifts, but I was under the impression that rolling onto the throttle while releasing the clutch was bad for the clutch? Please correct me if I am wrong.
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12-08-2011, 06:29 PM | #24 | |
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The fact is that this engine drops revs so fast that waiting until the clutch is fully engaged before touching the throttle at all just isn't realistic except for 1>2 and 2>3 shifts performed at redline. Re-engaging the clutch while under a little power isn't bad, and I think you'll find it makes for the smoothest solution, which in turn means the least wear on your clutch and other driveline components. Most "How to drive stick" guides actually say to gradually apply throttle as you let out the clutch too. That's what I do on upshifts into 2nd, 3rd, and 4th. For upshifting into 5th and 6th, I actually do a traditional throttle blip just as I would a rev-matched downshift and then stay off the throttle until the clutch is fully engaged again because I've found that's actually smoother for me than re-engaging under power. Although when I go straight from 4>6, I just come in under a little power without an intermediate blip. I guess if I did a throttle blip upshift for ALL gear changes that would be less wear than getting on throttle a little early as long as I did the blip and re-engagement properly, but that would be tricky to learn and cause shifts to take a lot longer. And honestly it'd be a lot harder to get that method right consistently, which means more wear and less smoothness when you get it wrong.
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12-08-2011, 06:33 PM | #25 |
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Some excellent considered responses in this thread - just to lower the tone though.......DCT FTW
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12-08-2011, 09:19 PM | #26 |
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Drives: C63 AMG & 280 SL on Weekends :
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2011 M3 Coupe TRADED [7.34] 1987 BMW 535is [1.00] Cars from the Past [6.50] The ///M3 Engine S65 [9.59] |
I find it not to be a problem at the start of the drive (engine still cool/cold ... oil still cool. Shifting from 1st to 2nd seams to be quite normal. However, after the engine oil is near or at normal operation temperature I find it may exhibit clutch noise as described by the original poster.
When my engine is at normal temperature I seam to control the problem (issue described by the OP) by simply gently releasing the clutch and controlling the RPM at the time of the shift. Depending on the situation (car slightly in motion - just before a traffic light change etc.) I may continue in second gear. I would say 90% of the time I start in first gear. I find smooth gear changes from 1st to 2nd in my case is a direct result of a) engine oil temperature and good control of the clutch (i.e. letting the clutch engage in a smooth manner by RPM control and slow release of the clutch). Works fine for me.
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12-08-2011, 11:13 PM | #27 | |
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M3 bullitt, we need a modern interpretation
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Thanks for sharing man!!! Great stuff!!! Reminds me of all the cool upshifting sounds from Steve McQueen's mustang in Bullitt (from reading the zillions posts about the carchase, the sounds were actually dubbed in from a GT40). That car chase will live for eternity. Here's one of the many youtube links for you guys who have not seen this (shame on you):
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