Thunk noise at High RPM shifting
#1
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Thunk noise at High RPM shifting
My Z is a 2005, 6sp MT. The transmission shifts very smoothly. However whenever I shift at about 4500 RPM or above, there is a 'thunk' noise for every gear. It's definately NOT grinding. It always happends when I POP the clutch. I think it's the noise of the transmission engages with the engine. So is it normal to hear this 'thunk' noise or the car is supposed not to make a noise when shift at high RPM?? thanks guys
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#10
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Easy to blame the car. I've been driving MT cars for 40 years, and don't find anything to complain about with the 350Z gearbox. Smooth shifting may require some patience and practice, but will become second nature at some point. The Z's drivetrain is not without flaws, especially the hydraulics in the HR cars, but the gearbox itself (even the pre-CD009's) is pretty solid.
Last edited by dcains; 05-17-2014 at 08:59 AM. Reason: typo
#11
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It's not. I'm not concerned about the engine revs, but smooth shifting requires matching the engine revs to the car speed and selected gear. If you're upshifting, you need to let the engine revs drop while shifting, and conversely you meed to blip the throttle and increase the engine revs when shifting down. OP mentions he "pops" the clutch, rather than releasing it smoothly, and that statement alone hints at a basic misunderstanding of how to drive an MT car. Shifting smoothly not only preserves the components involved, but it's also conducive to better dynamic balance when the car is near its limits. Go to a vintage racing event (i.e. racing involving cars without electronic paddle shift gearboxes), and listen to the fast guys and how smoothly they drive. You won't see anyone pop the clutch powering out of a corner or downshifting onto one, and you'll hear every shift with proper rev matching between gears. Hell, you can even drive next to a semi-truck on a hilly or curvy interstate highway and listen to how the driver carefully rev matches each shift. Imagine the gearbox has no syncros, and if you get your technique perfect, the shifter just slides into the next gear as smooth as silk. Any resistance or extra force required means you need more practice.
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My Z is a 2005, 6sp MT. The transmission shifts very smoothly. However whenever I shift at about 4500 RPM or above, there is a 'thunk' noise for every gear. It's definately NOT grinding. It always happends when I POP the clutch. I think it's the noise of the transmission engages with the engine. So is it normal to hear this 'thunk' noise or the car is supposed not to make a noise when shift at high RPM?? thanks guys
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