View Full Version : Car is overboosting and will not hold my set boost at all

09-28-2008, 09:44 PM
So for the past couple weeks I have been tackling a wiring problem that led to my car sitting for about 2 months. Before I let my car sit, my car was boosting fine and perfect. This is on a SR20DET with a 2871r turbo and internal wastegate that comes with the turbo. The boost was set at 14 psi low boost and 18 psi high boost.

I have a HKS EVC V and never had problems with it either. So right now the turbo basically will not hold boost. I step on the gas and it boosts to 24-25 lbs and maybe even further if I let it. It doesn't hesitate at all where I set my boost levels. And the strange thing is that this problem rose right after I fixed my wiring problem and got my car running.

Here is what I have done so far to maybe eliminate some of the basic problems.

1) First, I have unhooked the wastegate line that runs to the boost controller solenoid and just hook it directly to the hotpipe nipple. Result is that it does the same thing.

2) I have unhooked the wastegate arm and checked if the wastegate flapper was swinging freely. It moves with no problem.

3) I have adjusted the wastegate arm so there is less preload on the flapper. Still does the same thing.

09-29-2008, 01:07 PM
Nobody has any input? Anything at all? Suggestions?

09-29-2008, 01:29 PM
So you checked everything but the WG itself?

It could have been damaged and will not open the flapper while under boost.

Check out the WG itself.

Hook it up to an air compressor and blast some air into it, and check to make sure it opens at the preset spring pressure.

If it doesn't open, then you've found your problem.

09-29-2008, 03:19 PM
WG is fucked...its not opening when its supposed to extend the arm. Time to invest on a HKS actuator...