I only assume the BCS does work because I never had an issue with it before (wrong to assume, I know). Boost gauge is tapped into the fpr line like most, and the wastegate is linked to the BCS like it should be. I suppose I could pull the BCS off my gsx to see if there's any change, since that's the only other BCS I have.

Run a straight line. See what it does.

Straight from what to what?

Wastegate actuator to the nipple on your compressor housing. Assuming the t28 his a nipple on the housing like the t25 does.

Well I forgot about the nipple on the compressor housing. That nipple is hooked to the BCS, but the W/G actuator is tee'd into it. My bad, forgot it was set up that way.

If it spikes to 12 PSI and levels back to 10 PSI fairly quickly I would not worry about it. If it gets to 12 PSI and increases further I would look into a boost controller.

Maybe I should take a video of what's happening, because I still think it's over boost, and if I so a video, you guys can see what's going on better. I'm not saying any of you are wrong, and really hope I am wrong so this can be fixed. I appreciate the info provided though.

Boost source being the nipple on the compressor housing correct? It has been awhile since I've seen 12psi. The boost will rapidly jump from 3 psi to 10 psi that it seems to max at now, and jump 2-3k rpms where I have to back off the throttle to get the rpms to drop to a normal level, otherwise I will red line and the car goes no faster than it was prior to the boost spike. My car didn't do this last winter except for a couple times when traction was lost in the snow (a normal thing), which was after the exhaust install. It's really only been noticeable this year. I guess I'll never really know for sure if the gauge is accurate or not, I can only speculate that it is. I will try the BCS elimination, so long as the boost source is the nipple on the compressor.

No video tonight, was snowing on my way home from work. Will attempt tomorrow if the roads are clear.

I am totally not understanding you when you say boost does xyz but then it jumps 2k rpm. Are you saying it hits 12psi and then rpms go up really suddenly? Boost creep occurs when the wastegate cannot bypass enough gas around the turbine. You will hit the set boost and then climb uncontrollably from there until you either blow up, back off or at the very least notice your boost gauge is way way up there. The sudden spike in engine rpm could just be a slipping clutch. Either way your posts aren't clear. Please elaborate.

I apologize for any confusion as that is not my intent, and the reason why I wanted to post a video. The reason I think it's boost creep is because the boost does rise uncontrollably and I always let off the throttle. The best way for me to describe it is I have the same effects of spinning tires on ice, such as high climb in rpms and boost but I go no faster. The only difference being that my tires have not lost traction. I saw 12psi as the max climb in boost during warmer weather, and now only 10psi. To me it's a concert because I build boost smoothly until 2psi, then it rapidly jumps to the peak limit, while the engine speed instantaneously jumps up 2-3k rpms or more depending on how long I hold the throttle.

You suggesting clutch slip could make sense as I've been letting my fiance drive my car periodically to gain more experience with a manual transmission. I hate that it has to be on a turbo car, but it's all I got. She does tend to ride the clutch here and there, and unfortunately, I do have a lightweight flywheel installed which I can only assume would make possible slipping easier since there's a lot less rotational mass.

I hope this is clearer, but if not, let me know what else you need for info.

Still dosnt sound like youre going over 12psi. If your rpms are rapidly rising like that its because when you get into boost the clutch slips. Try it in fifth gear. No way for rpm to rise super fast then but if they do youll know for sure.

Ok. Will try that after work then.

I just went through driving through all gears to watch for the rpm jump. Every gear including 5th, spiked after 3k rpm. Not exactly at 3k, but between there and 3500. Always jumping at least 2k up. Guess this means I need to put on my spare clutch disc.