I installed a 17/22 turbo on a BEW about 15k ago. Ever since then I have been battling with this overboosting/ barking/ flutter issue. It drives me crazy and I can’t seem to beat it. To me it seems like a tune issue and I don’t know why mine would be different than any of the other cars. I’ve been in touch with Jeff on this both driving to his house and waiting 16 hours for his advise at Jon’s in St Mary’s OH (very nice people, bty). We’ve been thru all the sensors either checking or swaping them. Adjust the rod till I’m blue in the face. Verified that the request matched the actual. Put in stock tunes you name it. Good lift pump and fuel delivery. Been thru the different smart actuators which includes flipping the board in it and swaping the wires in the harness so it reads 100% at idle and not 0% or vise versa (that was supposed to be the silver bullet but wasn’t). I’ve also been in touch with ID who I got the parts thru to no avail. About a year ago I got busy at work and said screw it and gave up, but I’m back on it again.
Basically there is a narrow boost window in which the car will operate without going into limp mode or throwing a CEL. When I’m on the one side of that window the car runs like a champ but is almost undriveable in 4th and 5th gear without major flutter. On the opposite side of the window the car is laggy, smokes a lot, but very drivable in the higher gears (only slight flutter) but boost doesn’t come up quick enough in 5th to match the request and it throws it into limp. To me the perfect fix would be to have the car fun a different boost map in 4th and 5th gears because it just boosts to darn much. Everywhere else it’s basically fine. I’ve even debated putting a micro switch on the trans so that when it hit’s 4th and 5th it runs the N75 signal thru a resistor lessening the boost in those gears… that’s the best I could come up with. Even at that though it would still do it. Love the turbo but hate it at the same time. Did some research and saw some other people saying that they all do that some (flutter that is) and that it was kinda inherent to having a bigger compressor. I think that’s bs. Thinking about trading mine in for just a VNT-17 so I can get some drivability back. Any words of advise? Anyone? I'd like to give that turbo a good name but instead I just find myself calling it names
Basically there is a narrow boost window in which the car will operate without going into limp mode or throwing a CEL. When I’m on the one side of that window the car runs like a champ but is almost undriveable in 4th and 5th gear without major flutter. On the opposite side of the window the car is laggy, smokes a lot, but very drivable in the higher gears (only slight flutter) but boost doesn’t come up quick enough in 5th to match the request and it throws it into limp. To me the perfect fix would be to have the car fun a different boost map in 4th and 5th gears because it just boosts to darn much. Everywhere else it’s basically fine. I’ve even debated putting a micro switch on the trans so that when it hit’s 4th and 5th it runs the N75 signal thru a resistor lessening the boost in those gears… that’s the best I could come up with. Even at that though it would still do it. Love the turbo but hate it at the same time. Did some research and saw some other people saying that they all do that some (flutter that is) and that it was kinda inherent to having a bigger compressor. I think that’s bs. Thinking about trading mine in for just a VNT-17 so I can get some drivability back. Any words of advise? Anyone? I'd like to give that turbo a good name but instead I just find myself calling it names