lose boost at 17 or 18# of boost could it be waist gate is bad or

[villain1]

the E boost commander is bad the original owner of car thinks it could have been the boost commander it hold for a little bit then drops all boost.

 

[SHADOWII]

Not familiar w/the E boost commander, but are you able to monitor knock? Eliminate it from the circuit, then eliminate the boost solenoid by connecting the turbo tuner style. Just don't keep your foot in it for any length of time if you're not familiar w/the workings of the TR. Check your wastegate also w/a mighty-vac if you have one.

 

[jasjamz]

Check your intercooler hoses and clamps.

 

[87buickracer]

check for exhaust leaks or cracked exhaust manifold...