Anyone else had a problem where the boost reaches a certain psi and then the needle just starts fluttering or shaking around in the guage? Some of you may remember I was having problem with it not boosting under 15psi, then after welding up my pipes the boost would not go over 10psi at 3rd+ gears. Then recently I get the paraniod boost needle that would just start shaking and shifting around 10psi. I am convinced it's the turboxs boost controller.

sounds like it. my greddy doeas the same thing if its not dialed in just right.

i have similar problems with my profec a. when i had the s16g on there, i would boost and it would be dancing around, or it would just shoot upto like 25psi and stay there

Different car but my SRT's boost guage would do that at full spool and it turned out to be a defective guage. It was kinked/leaking where the nylon tubbing met the brass couplers.

My gauge does that too. It's mechainical right? Probably a bad gauge or a leak in the signal line like uber said.

Well i woould change the gauge as well V but FYI the turboxs MBC is a piece of shit. I have never heard a single nice thing about them.


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I believe sir Remy is right about the boost controller. I doubt it's the guage because I can feel the car bogging also while it's doing it. I can tell the difference between 15 and 10psi.

Originally posted by Remy
I have never heard a single nice thing about them.

Ditto, I get to help install the 3rd engine my buddies 95 EX has seen in under a year becuase of a TurboXS controller failing. And yet he still swears it's a good controller. :shrug

I don't know if you have the HP boost controller from turbo xs but mine holds pretty well. The only issue I have had is that sometimes my boost lowers itself, but I do not know if that has anything to do with the temps or what... so... :shrug