The old Boost spike~ ish

[R.D]

A while after getting my car, i noticed sometimes when i stomp the pedal down to where it belongs, the boost jumps to around 18psi. It normally holds around 14psi~. untouched. But on occasion it jumps to around 18 and then slowly decreases, but doesnt really make it back to the usual 14. (it might in say 4th/5th gear, but when going that fast I generally dont study the gauges haha).

Its fairly stock, i think i read that bigger diameter pipes from the turbo can cause spikes? But mine is cat-back, so cant be that?

Im guessing it has to be a leak, cause it definitely doesn't go harder when it jumps to 18pound. I think id say a decrease in power, but if it was a leak somewhere, wouldn't it be happening nearly all of the time, if not always.

Wat do ya'll doctors suspect ??

Cheers!!

[Guest boostcut]

id say that your butt-o-meter is broken. if the guage is reading correct then 18psi is manifold pressure assuming you have it plumbed correctly, it wont have a leak... it will spike when the ambient temp is alot cooler than usual as in early morning.. what car is it?

[R.D]

the car below. v4 sti.

So what one must do to fix a butt-o-mete then

So if its not a leak, it actually is boostin 18 pounds of glory? That must be stretching the stock fuel set up? Why does it feel slower then?

[Guest boostcut]

if i was you, 1st thing would be to check any codes stored, then reset computer.. i believe v3 sti run around 17psi factory so v4 could be similar... i wouldnt be worried about it tho unless its detonating

[nt_a_foz]

v4 round 14-15psi bro tahts what my coupe run

[R.D]

yeh that sounds correct. So any clues???