Do we need to cap the P- Valve?

[2013ZLJAUN]

Just wondering if on the ZL1 do we need to cap our p-valves like on the CTS-V? I did a bigger lower pulley and am noticing my boost is maxed around 12psi.

Thanks!

[2013ZLJAUN]

Jesus! Not all at once!!!

[Stephen12ZL1]

Originally Posted by 2013ZLJAUN

Jesus! Not all at once!!!

if the tune is done properly, no capping is necessary. My car runs at 14-15psi with no cap.

[2013ZLJAUN]

Then why is it needed on the CTS-V??

[Stephen12ZL1]

Originally Posted by 2013ZLJAUN

Then why is it needed on the CTS-V??

I asked my tuner that exact question and he said to stop worrying about something that doesn't matter if the tune is properly performed. I think that the capping of that valve was in the beginning of modding CTS-V's in 2009 and I never see any mention of it now.