Boost leak, Bad turbo or is this normal ??

[Sebas]

Hi. I'm hoping you guys can help me
I have a '89 Supra Turbo. I having a problem with boost. I had the car at the drag strip this past weekend The car ran 13.9 at 103 street tires at 35psi and it was 38 degrees lol

The cars runs at 13-14psi from idle to about 4500,then from there to redline I drops to 10psi. I also had the oil dipstick pull out. I did a boost leak tester I cap the turbo inlet, and cap the 3000 pipe before the TB
Took the bpv and install a gauge, put about 14psi of air just to hear it come out from the catch can vent at the valve cover. Can you help me with this. Thank you very much !!!!!
I have silicone hoses, dp, test pipe, blitz exhuast, lexus afm,
Afpr at 43psi

 

[Suprapowaz!(2)]

The dipstick pull out on its own after a hard run? Blow by. Time to perform a leakdown test.

 

[Sebas]

I did a compression test I had 141psi in 5 cylinders and 136 in one
and I don't have any boost leak anywhere

 

[Suprapowaz!(2)]

I'm not saying blow by is causing he boost drop, I'm saying that when your dipstick pushes out after a hard run that's cause by cylinder pressure blowing past your piston rings into the crankcase and forces that dipstick to pop up. I hope I didn't ruin your night. I could be wrong though.

 

[IndigoMKII]

stock ct26? they don't hold to redline cause the turbine is too small.

if your dipstick pops out by itself, you have excessive blowby causing increased crankcase pressure or your crankcase vents are clogged/faulty.