Needing some advice! Losing boost at higher rpms....
 

Hey just looking for some good ideas/advice on what to check, im peaking 10 psi which is what i want to run for boost but the higher i get in the rpm range the more it drops, it gets down to 7psi at times. Any ideas would be great, thanks in advance guys!!

Have you checked for boost leaks?

Its on the agenda for the week lol, im gonna smoke the cold pipes and intake manifold, im thinking its the ls6 springs or its just overcoming the spring in the wastegate??

The belt may be slipping.

That smoke stuff seems pretty cool :) I remember having to tape up the exhaust pipes & pulling the filter & installing a plug & pressurize the whole system with air to find boost leaks. Shhh be quiet I think I hear something kinda stuff lol

what would belt slip affect on a turbo motor?? Yeah the smoke machines are life savers for intake and evap system leaks!

Sounds like the springs. I see you have a pat G cam, what are the specs? Ls6 springs are only good to around .550 lift

my bad thought it was SC

im running the ls7 cam at the monment, its like 565 lift with 1.7 rockers i believe?

Yea I would think that is your problem. There is guys that get valve float on the ls6 springs using the z06 cam which is smaller. I was runnin .660's with a .580 lift. With boost you gotta have more then enough spring!