boost cut need help

[fly240]

Does any one ever have their boost above 10lb without any problem on stock turbo. My situation is that when I roll on 3rd, 4th or 5th gear and have the boost at 11 or 12lb the cut happen...It does not happen when I take off from the line, only when rolling on higher gear...I'm very sure it's a boost cut. How can I go higher boost with out having this boost cut on stock...I need help with any tips....thank you...

[Joe]

explain whats happening when you hit this "boost cut"

[fly240]

it gaves a big chock, the car didn't shut out, my friend saids when his supratt have that cut, the car shut off for few second and back on....

[Joe]

well heres the thing

RB's dont have "boost cuts"

so something else is wrong.

[fly240]

really, I have no clude what other could it be, could it be fuel cut or blow off valve. I have a use blitz bov, at first I was thinking that the use blitz bov might not hold higher boost, can this be?....

[Joe]

firstly, what engine is this?what fuel pump?what intercooler?

[fly240]

the engine is a rb25det with stock supratt intercooler, 255 walbrol pumps, 2.5" catback exhaust, stock down pipe.

[Joe]

first, clean your mass airflow sensor

you need a qtip, rubbing alcohol and a gentle hand.

sounds like you are maxing the MAF wich could indicate a boost leak.

[gawdzilla]

use electronics parts cleaner instead of rubbing alcohol. get the quick drying one CRC brand (small can) w/ the picture of the electronic plugs on it (not the one w/ the alternator picture).

[fly240]

I will clean the maf and see what happen, hopefully that's the case...

[Phats]

Not to scare you but i was under the impression that you shoud stay away from anything above 10psi, on a stock motor????Secondly, doesn't the ecu have a speed limiter??

Just some thoughts to throw out there

[240sxed]

Make sure your plugs are good and don't have boost leaks either.

[fly240]

do you guys have any problem going above 10lb boost...rolling from higher gear....

[skillzilla]

Definately sounds like a boost leak, make a leak tester (search google for it, its there somewhere). Pressurize your system to over 10 psi and see where the elak is.