JWT 700BB Kit - Wastegate Actuator Spring Upgrade
#1
JWT 700BB Kit - Wastegate Actuator Spring Upgrade
Hey guys - so I recently had a 700bb kit installed on my 03 Coupe and while doing the tuning, the internal waste-gate springs started to blow open and I can barely maintain 12psi even with the Haltech boost controller running at full duty. I currently have upgraded Actuators with 10lb springs (I think) - and is it possible to upgrade the spring to a higher one without doing a full engine drop as that's not in the budget. Also, I was hoping to tune up to 15/16psi so what size spring should I need to upgrade to? Thanks in advance - and sorry if the wording is off on some of this.
#3
Those turbos are hard to reach, just too tight. Exhaust backpressure in the turbine wheel can push past the wastegate valve open. If you remove the cats, switch out to 3 inch down pipes and remove the muffler or better install boost actuated exhaust dumps before the cats, your current springs will do a much better job holding pressure. Otherwise just be happy with whatever you get.