Join Date: Jun 2010
Location: Long Island, NY
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First off, the stock BPV can't handle the increased boost and starts to leak, that's why you are getting flutter. Did you put the Forge BOV in yet? It should help and use the medium spring and make sure you grease up the 2 O-rings that seal the piston and also the third O-ring that seals the cap. Total of 3 O-rings and they need greasing at least once a year. And bypass the solenoid using the black/white check valve.
It should run leaner with the tune, the tune adjusts spark curve, fuel/air mixture, etc. Running rich chokes the motor. Just because the backfiring sounds cool doesn't mean it's right. A motor is most powerful running lean and on the brink of disaster, but keeping it from going over that line. Back in the day, we had to get the timing advanced just to the point where it would ping and then back it off a little bit until the pinging stopped. And, Adjust the carb, go for a full throttle run and read the spark plug to where the it was lean enough but where it's not white hot and you kept on having to repeat this until you got it right. Now we program the ECU, how much more fun is this, cheating, not engineering, but what the heck it's evolution right, LOL!!!!!!!
2010 2.0T Premium 6 Speed M/T
SFR Stage 1 Tune 93 Octane
Kinugawa/Kamak (Forge) BOV and Bypassed
Megan Racing Tranny Mount
Actuator arm baseline adjustment, needed 3 whole turns
Injen Intercoolers Pipes
Turbo Boost Gauge
HID Headlight Conversion Kit
Red LEDs in Dash, Center Display, HVAC Controls, Steering Wheel Controls and Window Switches
LED Interior, Glove Box, Trunk and License Plate Lights
Spyder LED Taillights
Rear Lip Spoiler
Last edited by dagreekgencoupe; 01-23-2019 at 12:34 PM.