Stomps wrote:Rather than thinking about it in terms of rpm... think about it in terms of boost level... does it only start when the car makes full boost? Check this in various gears under load... if is a turbulence sound being made sheen the car his full boost, I'd be meaning towards your waste gate...
Not sure about these cars, but my old supra and soarer got this quite a bit after fitting exhaust.. you gotta remember that any freeing up you do behind the turbo (mainly dump pipe) will increase your boost slightly.. like I said I'm not sure what these turbos run at and what the wastegate spring is rated at, but if it releases enough back pressure and your boost rises enough, it could be causing the wastegate to open and close quickly... if I've go tthe right sound in mind.. remember, stock internal wastegates aren't exactly efficient at preventing boost creep..
Easy way to test this theory is to set up a boost gauge... watch to see if the boost spikes up and down under full load and WOT..
good luck, keep us posted on the results..
If anyone is following this thread I'd like to know if this is the same sound as I've got. I've posted it here:
viewtopic.php?f=55&t=18849&p=267466#p267466
Any ideas on whether this is a waste gate noise or just normal cheap after market exhaust.
