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I bet there is a solution / forum on here somewhere but I'm desperate for an answer.

Purchased an SFR 1.5 tune on my 2013 Genesis Coupe and the stock recirc valve started to flutter.

https://youtu.be/M-qIPfFxtH4

Similiar to the video above.

I feel like its running leaner as well, it used to backfire when engaging the clutch, now after the tune it just revs down slowly.

I've tried to bypass the solenoid, I purchased a Forge BOV, and the car has a new wastegate actuator (failed before the tune).

Can someone give me some guidance on this? Thanks!
 

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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!!!!!!!
 
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