RPM Launch?
I typically launch from idle speed. Is this safest? And best for the 1/4? Just curious. Thnx :tup:
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Safest yes, but also slowest. Fastest is slipping the clutch at 2500-3000 rpm on the verge of wheelspin, puts a beating on the clutch long term though.
At auto-x I don't care about 60ft times so I usually just dump the clutch at around 3000 rpm and break the tires loose, feathering the gas to control wheelspin until it hooks up. |
Clutch slipping at launch
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:confused: Thanks |
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Nah! Nissan manuals have something messed up with the design. It's a pretty common problem in the Altima/Maxima VQ/MT vehicles. My previous 2007 Altima 3.5SE 6MT did this as well. If you slip the clutch at a high rpm too aggressively, something in the master or slave cylinder gets all screwy and looses pressure. When I took my Altima to the dragstrip, I can't count how many times this happened.
The clutch just sinks to the floor and won't come back up and you end up slipping. Frustrating problem. SEVERAL 350Z/Altima/Maxima owners have had this happen in routine driving. Dangerous if you ask me! Late, Trav |
The clamping force of the clutch is a little light, lighter even than my G35 it would seem. I'm sure they did this to make it nice and smooth and easy to operate, but I don't think it's going to last very long even with the help of SRM. A high performance clutch will be the way to go when it wears out. Just make sure it is something that is street driveable, a heavy clutch with a light flywheel (if you change that while you're in there) is tough to drive.
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What he said. |
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Get the car up on a lift, look at the end of the hard-line between the clutch slave cylinder and the master cylinder, and you will likely find a small device that's inserted between the lines that prevents the clutch from engaging rapidly. |
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Removal??
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:thumbsdown: |
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But I'm 99.9% certain it's there. I remember seeing it on my 350Z. |
Gents,
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FYI, I played with footbrake launch RPMs on the 7AT last night on a deserted road, so I'd have some idea about behavior at the drag strip. The stall is higher than I thought it would be on a stock car, as I was able to get up around 2500 RPM while locked down with the brakes pretty easily. It might be possible to push it a little further even. In any case, 2500 RPM broke the back tires a little too hard, it pretty much just burned them through the redline in 1st and they didn't catch solidly until after the shift to second. Somewhere around the 1,800 range seemed to hook up more ideally, at least on a normal pavement surface. If the track is nice and grippy, might be able to get away with a higher RPM though.
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