32 GTR BOV's

[GeeTR]

Hey Yall,

Finally took delivery of my GTR, thank F*ck, I’m sicka ma 89 Laser! I’m doing a few tidy up mods; removing crappy fog lights, door rain strips, etc.

I’m already thinking about getting some decent air to the twin K&N's ( on HKS pipes) as they are made to ingest ex- radiator air. When I spy the BOV return pipe…

Ma Q: If I vent the BOV's to atmo, shall any thing too crazy happen, bar rich fuel pops between gears? I haven’t had a look at them, but I believe they are electronic ones; ( shouldn’t creep when idling) so simply looking for any ones experience.

PS: Not that I wanna make noise, tis I’m just interested.

Cheers

[R31Nismoid]

So they aint stock GTR items? Casue stock ones are awesome

worth checking it out one arvo

[GeeTR]

Hey Nismoid,

Yah, they're stock, I'm thinking about playing around and venting em to atmo... but would like to know if they will induce any more issues then usual, as I have a fair amount of commotion coming from the turbo side of the engine, chuffs, flutters and whistles, but no BOV action. Lame I know, but I'm now having to wait a fortnight or more until I can afford to register it at Dickson ( another saga) and need some thing to pass time.

Im definitely going to check em this weekend yah.

Thanks man.

- ^^

[TTT]

electronic? what are you talking about?

anyway, I think that you should upgrade and sell those crappy stock items to me for $50

deal?

DEAL!!

[[[d a n n y]]]

Blitz BOV mate..

i got a Pair for sale..

[Scotsman]

I was thinking of doing the same thing, but I have been told that the stock items stay open at idle and this means the AFM wont read all air flow and your car wont run propperly.

Havn't tried it, but it's a reliable source. My return pipe is damaged and thats why I asked the same question.

[TTT]

you can't use the factory bovs (GTST or GTR) in an atmo venting setup for the reason you just said above.

they are designed to stay open a little at idle and therefore only good for plumback.

[Roy]

This open at idle thing is interesting. I would have thought that the engien vacuum would not have been enough to overcome the spring pressure...so does that eman the air is bypassdd thru that little 1mm hole???

Also looking under the bonnet of the ICE Supra, they have little K&N air filters on the outlet of the BOVs...so that car with its RB26 BOVs isnt beign recirculated back to after the AFM????

[Guest DIRTgarage]

you can't use the factory bovs (GTST or GTR) in an atmo venting setup for the reason you just said above.

they are designed to stay open a little at idle and therefore only good for plumback.

who told you that rubbish, does nigel beales 10sec supra (who uses stock GTR blow off valves vented to atmosphere) have this trouble. My advice...put you keyboard away and do some research before posting such misimformed crap.

[R31Nismoid]

i can tell you nige's car definately ahs no problems

[Scotsman]

ICE must have modified the BOV somehow. Because Ben @ Racepace says they stay open at idle.

[TTT]

DIRT GARAGE - no need to cry mate.

The gtst bovs stay open at idle and I figured the GTR ones would be the same since they are used as plumbacks.

does this supra still use an AFM?

There was some details on the web on how to make a bosch bov vent to atmo with no stalling by using a one way valve on the outlet of the bov.

a friend of mine was using a bosch valve on his subaru which had an aftermarket ecu and no AFM.. even though it was open at idle it had no problems.

so this supra... afm or not?

[Beer Baron]

the only problem I can see with this thread is that someone has bought a GTR and can't afford rego. no offence intended, but if you can't afford rego, what are you going to do when your brakes need replacing? or your turbos blow? my advice is sell it for a little profit then buy one again in a few years when you have the funds to own and maintain a GTR.

[Roy]

Not saying anyone is wrong, but how do they open at idle...can engine vacuum be sufficient to suck the valve open at idle...? Or is there a small hole similar to the RB20/25 BOVs that allow air to pass, so when you vent to atmosphere it equates to an inlet leak? Im guessing thats the problem

If you dont plug up the inlet pipes where the std BOVs plumb back to then your going to have big dramas...and as for installing one way valve...im thinking that aint going to work too well...) have a think about it and you will see why.

...and DIRT Garage, have you actually seen the car:) If not how about putting away the High Performance Magazine article you read and stop flaming ppl when what they say may have some substance:)

I want to rip some std GTR BOVs apart now and see what i see:)

[Roy]

Actually INASNT uses them as well...perhaps he can have some input as he uses the GTR BOVs with his GT30 setup?!?!

[TTT]

roy..

I temporary replaced my Stock R32 gtst bov with a plumback GFB one.

Before I put it on the car, I loosened it all the way until the bolt on top that tightens it was turning on it's own and there was no spring pressure under it.. so right out.

then tightened it back until you feel it touch the bov piston.

then turned it over, and stuck my thumb up it's a$$. when you push the piston in, and look in the venting hole, it doesn't open until you push the piston in about 10mm.

so even on the lightest setting, the piston is that far in the chamber.

you take a stock gtst bov and look at it, you will see that the flap (it's not a piston) that seals the bov closed, sits on the base and as soon as you just push the flap up a little bit, it is already cracked open.

so with the stock bov not plumbed back, I watched it as my brother started the car.. as the car searched for idle and eventually stalled within 5 seconds, I could see the bov open the whole time.

the gfb plumback bov on it's lightest setting on the car, not plumbed back my brother starts it and it idles fine and stays shut.

how ever once you rev and release it blows off and stays open just a little too long and the car stalls.

once plumbed back it was fine obviously.

I sold the GFb off as it made no difference to performance and I figured I would use the $200 elsewhere.

now skylines use AFM's, so why would the GTR bov be different to the GTST bov?

the ecu reads the same sort of crap and needs to be re-circulated to function as intended.

as for the one way valve.. I can't see why it wouldn't work.

the problem of the stock bov being open at idle is that under vacuum (idle) it sucks air in fro the bov (if not plumbed back) and this causes it to stall..

the one way valve basically allows the bov to BLOW but not suck during vacuum.

I printed it out ages ago to try as a project but I can't find the article on the net now...

I'll keep looking.

it was on some guys miata.

it was a bosch plastic bov.

the one way valve was plastic as well.

[Roy]

Ahh, i see:) The check valve on the vacuum/pressure line. That makes sense:) What youve said, and obviously witness seems to make sense.

And the ICE Supra does run Autronic, so....but INASNTs car uses PFc...if he comes to Phillip Island ill get him drunk then run out and start ripping his car apart:)

[TTT]

found it..

http://www.geocities.com/kilruf/bov.html

take that monkeys..

[GTRsean]

I ain't got no AFMs so it doesn't matter what I do to the stockers. Took the return pipes off the BOVs and she sounds great. It's not too loud and doesn't sound like any BOV I've heard before. You can hear how much pressure gets released depending on how much boost is down the hole.