I need some help. Im new to the turbo world but excited to be here. I had my ss tuned at zzp and after about two weeks the car started falling on its face during acceleration. There are no service engine lights and as long as i stay out of boost it drives nice. But as soon as that needle passes 0 it starts falling hard. I was thinking it could be the stock bypass valve failing but I am not sure. Your thoughts please and thank you.

 

My best advice would be to contact ZZP, could be the tune. Just ask them what they think.

 

After vac, no pressure..... You my friend have a very bad leak. I would look for a tear, or busted end tank.

 

X2 on what foolmoon says.Check the system for a leak.

 

the only time my ss ever "falls on its face" is when my drop-in k&n air filter comes off which only happened a couple times. If you have no leaks i would check your BPV or mabe the MAF needs calibration.

 

thank you all very much this is a big help.