My friend's mechanic completely removed the CRV when he switched his BOV to an aftermarket one. Can you guys tell me what will it do to the turbos? Thanks.

 

CRV is made to vent boost from the secondary turbo before it comes online at 4500 rpm. If he removed it then the boost has no where to go and it will damage his turbo. The door for the secondary turbo stay close under 4500 and vents the excessive boost by using the CRV. Put it back on unless you are non-sequential.

 

Non-Sequential and aftermarket BOV. My damn CRV was leaking boost so I am glad to get rid of it.

 

If it's left in an open state by removing it then your secondary boost will never be added to primary. I had an electrical problem that left the CRV wide open. Gained about 50 hp when I fixed that problem.

-Scott

 

Removing the CRV (Charge Relief Valve) will not damage your turbos. Below 4500 the CRV is open to vent boost from the secondary turbo. It closes at ~4500 to add secondary boost to primary boost (the valve in your y-pipe opens at the same time). Note that the CRV is seperate from the valve in the y-pipe (or charge control actuator). Without the CRV the valve in the y-pipe will still operate as intended. As a result when you remove the CRV this path will always be open for the secondary boost to vent and will keep you from reaching max boost after transistion. Are you sure he didn't remove the blow-off valve (also know as the air-bypass valve)?

 

Wouldn't he reach max boost after the transition if he removes the CRV and caps it off on the Y pipe?

 

yes, but this would not be good for his turbos. I think bengraves was assuming that the CRV is completely removed and the hole was not capped, letting boost vent to atmosphere.

regardless, if the car is still in sequential mode, he should still have the CRV hooked up properly.

 

I agree - if it was capped off at the y-pipe it would be bad for the secondary turbo.

 

I assumed his mechanic capped off his CRV hole and just installed the aftermarket BOV and that can damage the turbos.