Thread: Waste Gate Actuator

The spring is quite hard don't be surprised, the rod is pushed forward by the diaphragm on boost pressure coming from the intercooler through the modulator which bypasses the pressure at low revs and opens as the boost increases managed by the ECM, when the turbo is in action the boost is helping too to open the waste gate so the spring is exposed to double action, direct boost against the waste gate port within the turbo and the pressure coming from intercooler through the actuator valve.... too light spring would let boost leak through the wastegate...the description in RAVE is wrong in this particular area(too)

Originally Posted by sierrafery

The spring is quite hard don't be surprised, the rod is pushed forward by the diaphragm on boost pressure

when you say "forward" you mean toward the firewall - correct?

Originally Posted by TAHAIC

when you say "forward" you mean toward the firewall - correct?

Yes, toward the turbo

Thanks Sierrafery

I just finished putting the turbo back on after fitting an EGT (pre turbo) and decat pipe. I had a closer look at the operation of my waste gate and the actuator is not moving at all when I get someone to rev the engine up to a bit over 3000 rpm. I pretty sure this should be moving right?

Yes it should move a bit if you rev it up to 3000rpm

Only under load will it move , free revving probably not , try compressed air , remembering you only need 15 - 20 psi depending on how short you have the rod

Won't see any movement while free revving.
Go pro camera in engine bay while test driving is a good diagnostic tool ☺☺😅


Jc