Quote:
Originally posted by Raptor@Oct 25 2003, 04:27 PM
The wastegate hole diameter becomes a bottle neck in many systems with increased exhaust flow. You can make the entry into the wastegate as free and easy a transition as can be, if the wastegate itself is too small it is still a restriction and will still cause boost creep.
|
You have to remember that restriction in a tube is consistent with the length of the tube. A wastegate port is only a restriction for 1/2", so it is not that big of a restriction. The low pressure area created on the other side will help to suck the exhaust out of the wastegate hole. Just think of the stock TB on the high HP cars, they get away with it because it is not very long.
Anyway, after taking my turbo off and porting it 3 different times, I finally figured out how to eliminate the creep on my 16g. I had a full 3" from the turbo back, so that is a good boost creep test.
Threaded Mode