I just put in an APS DR725 FMIC and APS 70mm CAI. I now get a flutter sound when I let off the gas. I've checked for leaks at the piping connections, but everything's tight. I've read that the flutter was always there but you couldn't hear it with the TMIC, is that right? The idle is also a little off from normal, might have to play with the recirc/bov screw. I've got a CEL too, but I think that's just from going to the 70mm intake as oppossed to the stock 65mm, so I need a new tune. Anyone have any thoughts? Thanks!
Wow, you must be planning to go HUGE!! Youre definitely going to need a tune both for the FMIC and the CAI, ASAP! That will fix your CEL, and also your AFRs and MAF scaling problems from the larger MAF diameter. It would be a very good idea not to beat on the car, and probably to drive it as little as possible until you can get it tuned. The flutter from the BOV is called cavitation. That is normal with a monstrosity of a FMIC like you have. Just make sure the sound is coming from the BOV and not from the intake, that would be compressor surge which is not good!
thanks...yeah, it's definately coming from the driver's side of the car. I plan on getting a tune this weekend and only using the car to get to and from work...and yes, I plan on a huge turbo once I get back from my next deployment! just getting started ahead of time!
You'll definately need a retune with the 70mm intake. Your CEL is probably a PO176 for "System too Lean", thats the one I used to get before I got my reflash for the 70mm APS CAI.
Definitely, the APS intakes flow lots and lots of air. I got the same Lean code with the smaller 65mm version.