Turbosmart Dual Port ; Good Alternative ?

[Piggaz]

Hi guys might be a stupid question but what model gtr bov should you recommend or are they all the same?

I got defected with mine venting to atmo, I have an aftermarket plenum, stock bottom and aftermarket top half.

If my intake doesn't have a port to recirculate can I plumb it into my airbox? Or will that be not enough to pass defect clearance?

The air still gets remetered through the AFM. No go.

[Greasterman]

Righto thanks mate, back into the plenum it has to go.

[R31Nismoid]

It needs to plumb between the AFM and the turbo... Nothing to do with the plenum

[JustinP]

Just out of interest, has it been proven that a single GTR BOV is more up to the task of running high boost levels (say 26-28psi) over a standard RB25DET BOV?

[R31Nismoid]

I ran 24psi/GT3040 through a single GTR BOV on my RB25, it would flutter ever so slightly so probably a needed to be a bit bigger, or go to dual BOV's.

[scotty nm35]

They both should be, the stock Stagea one I used ran 30psi fine once I plugged up the 4mm bleed hole with a grub screw. Now I have fitted the Turbosmart Kompact plumb back with a stiff spring. Its better but requires maintenance/lubing unlike the factory ones.

[Greasterman]

Thanks for your help.

Edited July 27, 2012 by Greasterman

[cobrAA]

one blitz vented and one oem ; look like a perfect match! just drove it for 15 minutes but its working A1.

[Rolls]

Well.. it was made for 13psi.. not 25psi.. Not sure if it will hold up and honestly not interesting in doing the test myself jsut to find out I have to re-do it agian because its leaking.

Just to explain how a BOV works and why more boost pressure shouldn't make it more likely to leak, the BOV has a diaphragm with a spring in it, so you have boost pressure on one side of it (the intake) and then you have boost pressure + spring pressure on the other side holding it closed (via the vac line)

So if you have 13psi running through your engine, you also have 13psi in the bov + spring pressure holding it closed, if you are running 25psi then you also have 25psi + spring holding it closed. So the more boost pressure you run, the more pressure is applied to keep it closed.

[cobrAA]

Just to explain how a BOV works and why more boost pressure shouldn't make it more likely to leak, the BOV has a diaphragm with a spring in it, so you have boost pressure on one side of it (the intake) and then you have boost pressure + spring pressure on the other side holding it closed (via the vac line)

So if you have 13psi running through your engine, you also have 13psi in the bov + spring pressure holding it closed, if you are running 25psi then you also have 25psi + spring holding it closed. So the more boost pressure you run, the more pressure is applied to keep it closed.

thanks!

[t_revz]

I've got turbo smart dual port. The trumpet faces up on a 45 and was blowing the sound deadening on the bonnet apart. Removed the trumpet and blocked the port with a piece of ally so now it's full plumb back. Just another negative of atmo bov's

[Rolls]

There are zero positives of atmo bovs.