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Blow Off Valves - when do you need one?

oscar32

By oscar32,
in Engines & Forced Induction

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oscar32 Mentor

oscar32

Posted
Posted

Hi all,

I know this may well have been looked at before, but I just can't find it anywhere.

When do you need to fit a BOV really, if you don't care about the noise. Is there a rule of thumb for power or boost or am I just being mislead.

I'm about to put a hiflow in my RB20, and I'm pretty sure I don't need one - but I'd like to know when I'll need to...

Thanks!

:microwave:

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DezertEagle Proficient

DezertEagle

Posted
Posted

I know in an R33 your stock BOV, has a 2 - 3mm hole in it. Block it up, it leaks boost.

It's meant to allow a smooth transition between no boost and boost, something you don't need when going down the 1/4 mile, but on a circuit where you want smooth linear acceleration you will need that hole.

Try it.

Oosh Veteran

Oosh

Posted
Posted
A quick fix is a couple of layers of masking tape on the day your taking your car to the track.

You could possibly plug it up with metal putty/bog etc.

What sort of pressure is it being exposed to? If it's anying like what's being vented, i.e. a partial atmo, then i'd be sus on masking tape holding up.

oscar32 Mentor

oscar32

Posted
  • Author
Posted

I'm guessing the leak doesn't apply to the 32??

I'm not really into schoolgirls, although that was funny.

I didn't actually want to change the valve, but a few places I spoke with, and magazine articles (which I'm aware are trying to you sell stuff) have said that once you look at changing the turbo, its time for a valve. I didn't think it ran true at all.

I also had a guy from a workshop (an evil workshop) telling me that a valve should be second after the exhaust for mods..... come on!!

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

If your stock BOV starts giving up the ghost, GTR items @ $150 or so are the perfect upgrade, cheap and super effective (see one of the threads below)

Hi all,

I know this may well have been looked at before, but I just can't find it anywhere.

I found lots

http://www.skylinesaustralia.com/forums/sh...hlight=blow+off

http://www.skylinesaustralia.com/forums/sh...hlight=blow+off

GTR BOV's

http://www.skylinesaustralia.com/forums/sh...hlight=blow+off

cheers-ash

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