Blow off valves .. Good or bad for our VR30?

[T3R5Z]

40000km on turbosmart diverter valves, still running strong and loud. With a safe tune of 19psi @425rwhp havent really noticed a power loss.

Upgrading the intakes and get a retune, will see what the dyno says after

Not really sure what you are trying to say.

BOV's are previously stated by someone stop boost pressure from flowing back into the compressor when the throttle is shut. Having a BOV is a good thing and prolongs the life of your turbo.

A factory BOV might only have springs rated for 15 PSI of boost, if you were trying to run 20 PSI it would be impossible to hit as the BOV would open and leak boost, this does not cause any damage it just means you can't make anymore boost then 15 PSI and you would need to run aftermarket BOV's

Has anyone got any actual data of how much boost the factory BOV's can handle? a google search says 14-17 PSI beyond this aftermarket BOV's will be required.

 

[Hernandooo]

Not really sure what you are trying to say.

BOV's are previously stated by someone stop boost pressure from flowing back into the compressor when the throttle is shut. Having a BOV is a good thing and prolongs the life of your turbo.

A factory BOV might only have springs rated for 15 PSI of boost, if you were trying to run 20 PSI it would be impossible to hit as the BOV would open and leak boost, this does not cause any damage it just means you can't make anymore boost then 15 PSI and you would need to run aftermarket BOV's

Has anyone got any actual data of how much boost the factory BOV's can handle? a google search says 14-17 PSI beyond this aftermarket BOV's will be required.

I'm actually confused as to what you're getting at as well. My understanding is that, these come oem with Diverter/ recirculation valves, not the usual vent to atmosphere BOVs

I've upgraded the DVs to turbosmart, maybe that's why it can handle the 19psi no problem?

Ofc OEM would be a limiting factory.

As for the traditional BOVs, I'm yet to see someone local install them. Would be interesting to see.

I would see the greatest benefits to upgrading to BOV, is when the whole turbo gets upgraded too

 

[T3R5Z]

I'm actually confused as to what you're getting at as well. My understanding is that, these come oem with Diverter/ recirculation valves, not the usual vent to atmosphere BOVs

I've upgraded the DVs to turbosmart, maybe that's why it can handle the 19psi no problem?

Ofc OEM would be a limiting factory.

As for the traditional BOVs, I'm yet to see someone local install them. Would be interesting to see.

I would see the greatest benefits to upgrading to BOV, is when the whole turbo gets upgraded too

You said the Factory divertor valve could cause DMG, that's not possible. a BOV, divertor valve, recirculating vale whatever you want to call it is the same thing. Vent to atmos is a open loop, recirculating is a closed loop.

OEM recirculating valves give better throttle response and are easier to tune with a MAF.

Swapping to a vent to atmos will give you the cool sound but is difficult to tune, you can also get hybrid setups.

The factory setup is fine for mild tunes, if you are swapping turbos and increasing boost you will need to upgrade to either setup to prevent boost leakage, not upgrading will not cause DMG but you just wont be able to hit your boost targets.

 

[Hernandooo]

You said the Factory divertor valve could cause DMG, that's not possible. a BOV, divertor valve, recirculating vale whatever you want to call it is the same thing. Vent to atmos is a open loop, recirculating is a closed loop.

OEM recirculating valves give better throttle response and are easier to tune with a MAF.

Swapping to a vent to atmos will give you the cool sound but is difficult to tune, you can also get hybrid setups.

The factory setup is fine for mild tunes, if you are swapping turbos and increasing boost you will need to upgrade to either setup to prevent boost leakage, not upgrading will not cause DMG but you just wont be able to hit your boost targets.

Ah yes! I did mention that, I didn't believe that the OEM diverter valves would hold up to the task, hence why I upgraded them. Main concern was longevity, after opening up the flow.

Since upgrading them, again the Diverter valves, have not run into any issues. Throttle response is sharp, but that could be from many other different factors, tune maybe. Overall very happy with how they're running now. Again at a conservative 19psi, maybe wouldn't have gotten that with the factory ones.

I think we're on the same page, just reading each other the wrong way?