External wastegate
Asked by Wrx14 Jul 21, 2016 at 01:31 PM about the 2014 Subaru Impreza WRX Limited
Question type: General
I am in the process of doing an external
waste gate with an up pipe and dump tube
swap. I've heard that you need to get a pro
tune when you do this. Why is that? Would
you be able to not get the tune and still be
able to drive the car without any CEL?
3 Answers
TheSubaruGuruBoston answered 8 years ago
Throttle mapping and fuel/air curves to keep AFR correct. You do NOT want to blow this up!
Drivable. Yes. The fear is about over boosting. Your engine might not understand the new parameters you've install. So it might squirt fuel like ussual. With a new wastegate you could be running higher boost. You engine can go lean (more air, less fuel). It causes engine to blow up.