My friend replaced the head on his 99 B5 1.8t. When he put it back together, he failed to re-attach the wastegate vacuum hose. Now that created some problems when it started making larger boost amounts, but at like 1/16th throttle it had amazing acceleration and much less lag. He found the problem and re-attached the hose and it takes 1/2 throttle or more to do the same acceleration. He just got an APR tune because he wanted that kind of small throttle acceleration and thought it was in boost amount. The APR tune made no difference under those conditions. Disconnected the vacuum line and the throttle response increased by a huge margin. Why is the wastegate opening under such low throttle positions? Is it in the tune, or is a sensor failing?
I realize driving around the wastegate uncontrolled is just asking for disaster, but it did create some interesting characteristics.
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