borat52

Installed a dawes device a few months ago to control my boost on a 1993 WRX, I have had a problem with boost spiking so last weekend I drilled the existing hole out to 1.5mm. Took it for a run and it no longer spikes. It does boost very slightly more with this hole so its advisable to screw it back a little before testing after you have drilled the hole. This is just for reference for people searching as I could not find a definative yes or no on here as to whether or not this would solve my problem.

Scott.T

iTrader: (2)

that should do the trick. It's what the hole is there for, so making it larger was the right think to do. Just back it off a bit to get the boost back where you want it.

borat52

What exactly does the hole do? I know theres some sort of ball under a spring so that as the turbo pressure builds up the spring gets compressed letting pressurised air through to the actuator, does the hole just act as a bleed valve untill the actuator does its thing(ie delay between spring being pushed and actuator starting)?