This may be something simple to fix but here it goes. Ever since going single I am having trouble controling my boost when things get hot. My profec, even when dialed all the way up at high boost, won't let me go over 1 bar. I tried moving the setting to all the mild and then all the way sharp to see if that would work but to no avail. When it is cold I can get all the way up to 1.14 bar but right as the heat expands the air, it won't let me boost any higher.

I ran low 12s at the track and I couldn't get over 1 bar, .97 was my highest reading. I probably should have broke into the 11s. Does anyone know what I need to troubleshoot. Or does the HKS racing waste gate need a new spring?

A friend of mine is running a identical setup and is getting proper boost control. He can control his setup very well but his wastegate, I think, has a different spring and is hooked up slightly different.

Any suggestions?

 

have you checked all your couplers and such to make sure you don't have a tear in a coupler or a crack in a pipe that may be causing a leak?
What spring are you using in your wastegate? Were you given any specs on it?

 

Checked all the couplers. No cracks in any pipes, not sure if aluminum cracks, it could I guess.

I don't think it is a leak but I probably couldn't hear it anyway due to my wastegate dumping externally. The spring is, I guess, whatever is standard with the HKS racing wastegate.

What I'm getting at, I suppose, is that if anyone with a TO4S, or other, has experienced this problem and how did you fix it. I know, it may be a leak but I've checked just about every possible thing. Any other ideas?