197 cup, 70k miles.
When shifting up a gear, or lifting off the power from harder acceleration, I get a wierd "flapping" noise from the front drivers side. It happens pretty much exactly when you would expect wastegate chatter noise on a turbo car. Its coming from around the belt/driveshaft/hub area and lasts about a second.
I can sometimes feel it through the steering wheel, very slightly. At first I thought it might be a weak aux belt tensioner and the belt was flailing about on sharp RPM changes - it that sort of noise, but I fitted a new belt and tensioner and the noise didnt change.
Ive fitted a powerflex top torque mount and new lower stabiliser for the engine, has the belt cover off to check the cambelt which seems OK (not due), I have fitten new lower swivel balljoints as they needed doing anyway, still no change. Ive also swapped out the drivers side driveshaft and again its made no difference, new anti-rotation link and drop links, still no difference.
Ive also had the subframe down at the back to change the manifold and made sure everything is tight. The noise happens/ is related to engine speed and not road speed.
I'm at a loss for what it is, unless the dephaser is failing and making a funny noise in the transfer between accel and decel. Anyone had anything similar? Any suggestions?
When shifting up a gear, or lifting off the power from harder acceleration, I get a wierd "flapping" noise from the front drivers side. It happens pretty much exactly when you would expect wastegate chatter noise on a turbo car. Its coming from around the belt/driveshaft/hub area and lasts about a second.
I can sometimes feel it through the steering wheel, very slightly. At first I thought it might be a weak aux belt tensioner and the belt was flailing about on sharp RPM changes - it that sort of noise, but I fitted a new belt and tensioner and the noise didnt change.
Ive fitted a powerflex top torque mount and new lower stabiliser for the engine, has the belt cover off to check the cambelt which seems OK (not due), I have fitten new lower swivel balljoints as they needed doing anyway, still no change. Ive also swapped out the drivers side driveshaft and again its made no difference, new anti-rotation link and drop links, still no difference.
Ive also had the subframe down at the back to change the manifold and made sure everything is tight. The noise happens/ is related to engine speed and not road speed.
I'm at a loss for what it is, unless the dephaser is failing and making a funny noise in the transfer between accel and decel. Anyone had anything similar? Any suggestions?
