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Originally Posted by rcdash
Beautiful car Derek and great job Sam and crew (as usual!). Two quick ? for GTM folks:
1. At what power levels do you feel the GTM CAI for this kit makes demonstrable gains?
2. In regards to the statement on high boost stability, shouldn't the HKS EVC be "the culprit", as it is managing the boost in this situation? The internal wastegate should see atmospheric pressure until the boost controller decides to "show it" the preset boost pressure - correct?
And for Derek, is that an HKS exhaust?
EDIT: Even with an electronic controller, actuator springs can cause the wastegate to open before desired because of exhaust gas backpressure that is pushing against the wastegate valve itself. This backpressure can overcome the spring pressure without the aid of the actuator at all. Is this what is happening here and is it because of a restrictive exhaust? Cats in place? Exhaust type? Thanks!
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I'd like to know the answers to those ?'s as well.
My exhaust is a custom dual 3" done by Evolution Racewerks. I used 2 Universal Apexi 3" in/out Turbo Mufflers, 3" piping with no cats or resonators, just test pipes.