Today I drove 30 miles with the yellow spring. I noticed the woosh noise was less than with the green spring. I feel like the car has a slight hesitation to it now. I also believe I heard air escaping through the air box (but not audible flutter noise).
I called Forge and spoke to a gentleman who informed me of the following:
They do not have any specific pressure ratings for the springs. These type of replacement BOV/BPV are common among many cars so it isn't a specific to Cruze application. But, one of the two springs should work for any application.
Green Spring:
Meant for stock boost levels and should handle any stock levels without problems. Potential issues: pressures are too great and the BOV/BPV will leak, causing a drop in boost.
Yellow Spring:
Meant for tuned applications running beyond stock boost levels. Potential issues: Spring is too stiff and has a delay, causing pressure to go back into the turbo.
I explained that the stock Cruze gets up to 16psi and I have a tuned application @ 22psi. He said then the yellow spring would be what to use. He asked me if I noticed a delay in the yellow spring and I said yes, but I also (I need to confirm) saw max 20 psi on the green spring.
He asked if the vacuum line was attached to the manifold directly or if it went to a solenoid. I did not know. I believe it goes to a solenoid (PLEASE CONFIRM THIS). He said if that's the case then it may be beneficial to tap directly into a vacuum line to remove that delay. Of course, he said he can't guarantee that information.
I'm going to swap the green spring back in and do some more driving.
Can someone confirm if tapping into a vac line directly would cause any issues with the car.
I called Forge and spoke to a gentleman who informed me of the following:
They do not have any specific pressure ratings for the springs. These type of replacement BOV/BPV are common among many cars so it isn't a specific to Cruze application. But, one of the two springs should work for any application.
Green Spring:
Meant for stock boost levels and should handle any stock levels without problems. Potential issues: pressures are too great and the BOV/BPV will leak, causing a drop in boost.
Yellow Spring:
Meant for tuned applications running beyond stock boost levels. Potential issues: Spring is too stiff and has a delay, causing pressure to go back into the turbo.
I explained that the stock Cruze gets up to 16psi and I have a tuned application @ 22psi. He said then the yellow spring would be what to use. He asked me if I noticed a delay in the yellow spring and I said yes, but I also (I need to confirm) saw max 20 psi on the green spring.
He asked if the vacuum line was attached to the manifold directly or if it went to a solenoid. I did not know. I believe it goes to a solenoid (PLEASE CONFIRM THIS). He said if that's the case then it may be beneficial to tap directly into a vacuum line to remove that delay. Of course, he said he can't guarantee that information.
I'm going to swap the green spring back in and do some more driving.
Can someone confirm if tapping into a vac line directly would cause any issues with the car.