Originally Posted by 03chi-town0Z

it's likely a maf code. usually attributed to a bov leak or some other unexpected activity on the intake side of the engine. it happens because at highway speeds, you are usually under a very light boost condition and the recirculation valve is in a state that can be difficult to manage if the car isnt set up properly. i had this problem with the hks ssqv installed. every time i would let off the gas coming up to a toll plaza and then try to accelerate moderately back to cruising speed, it would flutter like crazy and throw a code p1235 i believe. then it would lose power drastically and by the time i'd get to the side of the road, the idle would be really high (around 2k rpms and it would hunt up and down 500-1k rpms) and the shifts were extremely rough. turning the car off and letting it sit for a minute then restarting gets it to run normally again, but the code is obviously, as you said, still present.

if the kn filter and tune are really the only things done to the car, i'd take it back to ttp cause there's likely something in the tune that's not allowing the recirculation system to function properly and there's air going where it shouldnt. if you have their "boost control" modification installed, i would reconsider getting the gst or ams pill instead and get the car retuned for that.

for the time being, in order to prevent this from happening, if you are cruising at highway speeds and want to accelerate somewhat rapidly, let off the gas for a second, tap the left shift paddle to downshift and, once it has shifted, then hit the gas. the shift will cause enough pressure differential in the system to quickly open and reseal the valve effectively so there is no leak back up to the turbo, and no bucking condition, and effectively, no cel.

good luck!

Originally Posted by toredefine

Whoa, you're making 341 torque? Have you been keeping up with the threads on here? I don't want to go around assuming anything, but I would try to limit your torque to a number closer to 300, that's where I would start, because I'm thinking that's the problem.

Originally Posted by Bo0yaka

BOVs do not "flutter" they open and they close. BOVs can have all kinds of add ons that make all kinds of cool noises but they DO NOT FLUTTER.

You could have A. Compressor surge "compressor surge, caused by pressurised air blowing back through the turbo when you close the throttle. Compressor surge occurs when the blades of the compressor “slip” in the air, much like an aeroplane wing stalling. This condition is most common when shutting the throttle and not opening a BOV far enough, but it can also occur with the throttle open under boost conditions if the turbo is not correctly matched to the engine. The fluttering noise is simply a result of the pressurised air trying to escape through the turbo, and the turbo attempting (under its own momentum) to cram it back in. The high velocities of the air involved can sometimes make a chirping noise in combination with the flutter.
"

Or B. you are hearing your wastegate.

"The wastegate senses the boost pressure. If the pressure gets too high, it could be an indicator that the turbine is spinning too quickly, so the wastegate bypasses some of the exhaust around the turbine blades, allowing the blades to slow down"


Or C. SST over torque limit


I am voting for A with your mods

Originally Posted by Chops

I've kept an eye out, guys have been making more torque than my #'s and haven't cooked thier SSt yet. I don't wanna back it off unless i HAVE to.