Need Help Boost Coming On Too Early!

[gtst7]

I was just wondering how I would fix this problem? my boost comes on when I am still in vacuum as can be seen on the boost gauge when I'm driving. It hit boost at about -.5 bar.

It's a r32 gtst 92. I heard that all I need to do is change my bov and tighten the spring so it will hold boost in longer. Thanks

[dezz]

it hits negative .5 ?

thats not boost...thats vaccum...

[RANDY]

my boost comes on when I am still in vacuum

I think Dezz is onto you! You must have two guages... one in bar (aftermarket) and the factory dash one still working.

So... to expand for ya... the halfway horizontal mark on the factory guage is "0"... which is on the border of vacuum and having boost. Anything above that line is boost measured in mmHg (milli-meters of mercury). Anything below is vacuum.

Bear in mind that the stock guage is not as accurate as a new, quality guage... so the readings between it and your aftermarket one may vary slightly.

[gtst7]

I don't have a stock gauge... never came with it for some reason... all I have is a HKS boost gauge.. what I'm saying is when it hits about -0.5 bar I can HEAR the boost coming on...

[dezz]

when it approaches 0, the turbo is starting to come into play....but its not on boost till its above the 0, and into the + section of the gauge.

if your car doesnt have a stock boost gauge, its either had the cluster swapped (broken cluster, lower k's etc etc) or it used to be a GTS, and has been converted to a GTS-T.

If you put your VIN number up, or PM me with it, i'll check that out for you.

[kjb_r33]

Its proberly induction noise you can hear, do you have a pod filter?

[wilch]

It's a r32 gtst 92. I heard that all I need to do is change my bov and tighten the spring so it will hold boost in longer. Thanks

Ummm... do you mean boost is coming in late? You can hear the BOV venting prior to the car coming on boost and you're getting lag?

Cause I have never, EVER heard of anyone complaining about boost coming on early.

[RANDY]

I agree with Dezz..

If you're hearing the turbo spinning up, that's not unusual. They spin up to 30,000rpms at full boost, so you can imagine that when you are just normally driving "off boost", the turbo is spinning around 2000-5000rpms... it's going to be audible.

If you push the accelerator in halfway, you are likely to hear the turbo building up speed before it actually spins so fast that it's putting more air in the engine than the intake would normally suck in.

Totally normal, basically =-]

(mine does it. Especially first thing on a cold morning... I can't go over 1500-2000rpms without it spooling up on its own... in granny mode)

[fr0st]

My BOV seems to go off even if my boost gauge (aftermarket one) isn't in the positive. From about 2200 onwards it goes nuts on every gearchange. I think its to do with the way you change gears... if you quickly take your foot of the accelerated with thottle body will snap shut, the little bit the turbo has spun up will provide enough boost to blow off. If you slowly take your foot off the accelerator you can spin down the turbo and no bov noise. Atleast that how I think it works... I could be totally wrong

[RANDY]

My BOV will go off even if I don't reach positive boost.

[BiRDY]

dude the stock RB20det hits boost quite qwickly.. mine spools up and hits decent boost at around 2500rpm id say?.. them the revs jus climb rapidly from there..

i dunno im in perth and mine is stock cept for the front mount if u wanna compare?

i think ur boost gauge might have a dude vacuum signal going to it.. maybe the line is pinched or something?

i think the stock rb20det actuator is set at around 10psi from what ive heard so if the blow off valve spring is really weak they are going to make alot of racket.. my r2d2 does when i set it soft..

dunno, pm if uve got issues as i said im in perth and both me and my mate have stock r32's