BOV on 4AG-ZE (seriously)

[Sprinterboy]

I have a BOV on my GZE

current set up goes, airfilter>SC14>cooler>BOV>XF falco TB>plenium

the bov opens up the same way/manner as it would on a turbo set up car, I just have the advantage of supercharger

I will try and get some more pic's as the car is currently in getting installed an autronic puter

http://www.ae86drivingclub.com.au/fo...opic=530&st=40

some early pic of the car but you can get the idea of where the BOV sits

[Ben Wilson]

That looks great, have you driven it like that?

[Ben Wilson]

I picked up a Turbosmart blumback to try this out, after pulling it apart, I decided that the standard spring is too heavy and I really need to find a softer one for using it with a supercharger.

I called turbosmart to ask them and they sell a spring specifically designed for it using a BOV as a supercharger bypass.

I'm just about to order it.

edit - The guy on the phone didn't mention they won't have any for two weeks

At least it will give me a chance to tidy the rest of the plumbing...

[Ben Wilson]

Hooked it up tonight:


It looks cool

And does vent (video):

Click here to watch BOV4956

Hopefully, when the new spring turns up, all will be well

[takai]

Wicked, that looks like it may be a good setup. Eager to see the results.

[Ben Wilson]

The video doesn't really demonstrate the noise, it isn't loud, but your ears hurt. A lot like when you unhook a compressor hose..

I think I'll plumb it back

[takai]

It does sound very forceful. Where would you plumb it back to?

EDIT: In the intake piping i guess. Serves me right for posting when tired.

[Ben Wilson]

Yeah - If you have a look at the earlier photo, you can just see the pod filter poking out below the intercooler.

[mic*]

Im glad you stopped stressin bout hurting your TB or SC with air hammer on closed throttle.

You're still running the clutch arent you? So there really is never gonna be too much air to worry bout. Not more than can be handled by the BOV you have.

I would be inclined to muffle it somehow rather than plumb it back, basically so you arent re-heating that volume of air again then swallowing it.

[Ben Wilson]

I never stopped stressing about it, that's what the BOV is for.

Hopefully with the softer spring, the BOV will open at cruise and idle giving me decent fuel economy. I'll need it filtered than, so I may as well plumb it back in. If the supercharger isn't compressing, the air shouldn't be hot, so I don't think that will be a problem (holding my hand over the port, the air coming out isn't hot anyway).

I'm beginning to think about a fixed pulley as well - I'm considering the falcon aircon pulley (might have to get rid of the 175mm NEVO first).

[mic*]

Well if you went down the track of fixed pulley i would definitely vent to air coz the charge would always be fairly hot, and your valve would never actuate on cruise coz you would never have any real vacuum.

What kind of manifold vac are you expecting on cruise now that will be enough to open your BOV as a cruise bypass?

I guess if you keep the clutch, and the vac will be enough to have the BOV sucking air you might as well plumb back for the simplicity of not having to muffle & filter it.

EDIT: Also, at what psi is your new spring gonna start to bleed boost?

[mic*]

Dunno if you've looked at this, but you could use a BOV that supplies a boost line to the back the diaphragm. Then you need a stiff spring to keep it closed under boost, but the slightest vacuum snaps it open coz there is a greater pressure differential between the front and back of the diaphragm.

[monkeymajik]

That bov looks like it has one, just not connected (in the pic).

[mic*]

(having looked at pic blown up now)

True monkeymajik. Connecting it is not really gonna achieve much i spose. Except better venting using that same spring.

I just woulda thought that a soft spring will limit your boost a bit Ben...

[Ben Wilson]

Under boost, you've got the same pressure acting on both sides of the BOV, so the springs should hold the piston shut. The piston cloese against a lip which should theoretically give it slightly less surface area on the bottom, hopefully forcing it shut as well.

I tried an old RC car suspension springs in it last night, but it wasn't quite stiff/long enough to close the valve in time. It does look like the idea might work though.