i've heard some people using carb springs as actuator arms, i like the idea of it failing in the open position instead of overboosting. can anybody give me an exact part number or something i should use to find it? or at least a rough idea of how strong it needs to be? i was originally going to go with the IWG's 8psi, but i need to clock the turbo to run my intake piping, and since i'm still using the d15b7 i'd like to set her back to around 5-6psi. just til i drop in my z6. that'd make it easy to change spring weights, and uberdata automatically adjusts to different pressures since it uses the map signal to control fuel/ign.

 

what's the best way to do it?

 

is this what your talkin about? its a simple chain, and spring. i use it everyday! it holds boost pretty steady, and beyond belief if works. its a tempary thing though. also, boostcut is a great peice of mind.

 

why worry about boost cut (even though i'm enabling it to be safe)? if it fails, its gonna fail in the open position. yeah thats what i was talking about, only i wasnt thinking about using the chain. just one big spring or 2 separate springs. it seems like a pretty good idea, using exhaust pressure to open the wastegate flapper...

 

its pretty uncontrolable. like i said, it works, but i wouldnt want to use it all the time. if you want to up the boost, just tighten the spring.

and heat from the turbo heats the spring up loosing tension, which in turn opens the WG a little sooner.