Possible Overboosting? Suggestions?

[gotRICE?]

Seeing as im kinda new to the Turbo/Skyline area im at a loss to what to do next..

Anyway heres the problem.

Last night i noticed the stock boost gague reading higer than it normally does. It doesnt hit +7, but its probly 2-3mm off it. Maybe half way between +5 and +7, maybe a little more. Kinda hard to keep looking at it

Mods are as follows,

3" JRR Split Dump/Front pipe

3" De-cat

3" HKS Silent Power Catback

Stock "Hi-Boost" mod

A'PEXi Intake

Before i installed the Dump pipe, it would boost straight to the +5 line and stay there always. And now, it will boost to that, then creep up a little then hold again at the higher PSi.

Basically what i want to know, is it possible that theres a problem? I have checked all vacume lines etc for leaks.

OR

Is it just that the exhaust is very free-flowing and its just boosting higher cos it can?

At a guess, its around 12psi from the stock gague.. but i really dont know. And i read that 12psi is kinda the max you'd want to run on a stock turbo yes?

Seeing as its only done 50,000km, im not too keen on destroying it any time soon

I dont have an aftermarket boost gague at the moment either so i cant be 100% sure.

Ideas? Its it bad? Normal?

The next thing i spose ill have to do is put the stock dump pipe back on and see if it goes back to normal. Not keen! ha.

Thanks guys! Any help is appreciated.

[Adriano]

The stock gauge isnt very accurate, however the exhaust will have raised the boost to about 10 psi, i would chuck a gauge to check it, but i doubt there is a problem.]

[gotRICE?]

Cool.

Based on the stock gague, accurate or not, with the HKS exhaust and decat (stock dump/front) it would constantly boost to the +5 mark on the stock gague.

The increase is just from adding the dump pipe. Ill see if i can borrow a mates boost gague and have a look, make sure its actually not running too high, nor creeping higher. Dont want to go buy a cheapo gague meerly cos its a waste of coin and not the look im after, im after an APEXi EL2 series, but they are pricey and i also neet the control unit lol.

Thankyou for your input. Turbos are so much more complex than VTEC's haha. Or is it just that im not clued up yet

Edited December 9, 2007 by gotRICE?

[SevenAngryPenguins]

i had same problem when i put my highflow cat/exhaust on, it would boost creep to about 14 psi or so. the wastegate is to small on the stock turbo i pulled it off and used a die grinder to enlarge it a bit which dropped the boost to about 9psi