Quote:
Originally Posted by ricky bobby
just hit 900
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At 900 miles, the transmission is still on the tail-end of wearing in.
So many people think that you break in an engine on a new car. Yes, you do, but you are also breaking in the clutch, brakes, wheel-bearings, axles (some cars), differential(s), and all the gears/bearings in the transmission.
Varying your speed, not loading the transmission/rear-end 100%, not launching or shifting it in a way that would "shock" the drive-line, and making sure to accelerate smoothly AND decelerate smoothly (helps the rear faces of the gears in the drive-line wear in, as well as providing more vacuum in the engine to suck the piston-rings against the cylinder walls) will yield a drive-line that has the most potential to operate quietly.
I know many people say engines break in in a few miles, blah blah blah, but that was not my experience with my Z06. It sooted up the tail-pipes badly for the first 2-400 miles. Burned through about 1/2 quart of oil.
Changed the oil at 600 miles, and it has not used a drop since, and the tail-pipes are properly soot-free even after spirited driving.
I think a lot of "noise" has to do with the break-in process, although the pre-load and after-load on the gears in the transmission, as well as the profile of the teeth, are suspect as well. Not necessarily bad, very likely "nature of the beast" type stuff.