Hey guys, I built the block of my gsr, and put a custom kit with turbonetics t60 turbo. When I had it tuned (chrome) we finished @ 15lbs 360whp. Now I am only hitting 12 lbs, not even a spike to 15...A few weeks ago I replaced a bolt from my manifold to turbo setup, and it began hitting 15 lbs again, but this morning its back to only 12. I check and I'm 99.1% positive theres no vacuum or exhaust leaks...Anyone have any idea where my issue is??

 

any suggestions?

 

What are you running for an air filter/intake setup? I lost like 3psi when I was running a ghetto fabric + mesh filter vs a proper air filter

 

couplers tight? Do a boost leak test and see if you have any loose couplers!

 

Weather can also effect what psi your seeing.
How accurate is your gauge? A few psi on a gauge could be difficult to justify depending on the gauge and the range