Originally Posted by
ray barker
would i be wright in saying that the atmospheric releases out to the atmosphere and the recirc one blows back through the charge cooler i thought i read in fast ford that they blow back and keep the turbo spun up but from what im reading its blowing back in the oposite direction do both make the same noise my thinking of running withought was i got a less chance of having boost leake through the waste gate mine is on top of the std 2wd charge cooler
Yeah atmospheric just releases it under the bonnet. Recirc will take it from the intake and return it to just after the airfilter and is usually a much quieter operation.
The argument goes that releasing the pressure from the intake through a dump valve / recirc will allow the turbo to spin freely and mean less lag between gear changes as its already spinning. However, the other side to that argument is you have dumped all the pressure out of the intake and the turbo will need to repressurize it again.