all i have chaged is the filter to a K&N... when i accelerate in first or second when boost comes on the car will kinda stutter around 3000-3500 rpm is this due to the filter or is this just how the car is. 08 wrx...
most of the turbo subaru's, regardless of year, have a stutter in that area. We have never been given an official reason, but we figure it has something to do with emissions. I always went with a COBB AP for my modding and even at stage 1, the stutter would be gone.
i noticed the same thing after fitting the CAI to rex felt like it wasnt as torqey and stuttered in 3rd n that higher up in the revs so i removed it and will not be fitting it until i get verso tuned along with the exhaust just incase it may cause damage
I have the same thing in that RPM range usually in 2nd and sometimes 3rd gear too. It is something people in the car don't notice but I do. Just something I have learned to live with. I will be getting an AP in a few months then hopefully it will go away.
I told the tuner i can feel several flat spots as i'm accelerating up the RPM. So the tuner tried.
It seemed that my engine was "knocking", and the ECU was compensating, hence the flat spots.
In addition to that, my car was running extremely lean, especially whan engine load is high (even with a stock ECU). This is cause the stock pump was insufficient to supply enough fuel during acceleration to the engine.
Hence my car's stuck at the workshop now getting fuel pumps and regulators. Injectors are not required as they're already 500cc
Maybe you should go get a tuner's opinion.
Knocking and running lean are extremely dangerous situations, and should be fixed ASAP.
i had the same problem and still do but noticed it more with a CAI so i reset the ecu and it stopped doing that while the ecu was recycling but once the ecu was good it did it again. i need an AP. anyone wanna donate some cash to the Get Eric an AP foundation? lol j/k
I have found that all/most WRX's (and essentially all turbo Subaru vehicles) have the power delivery like you described.....I know mine have. I have to say, I did a DIY grounded kit and it made a very positive difference (to my surprise - I was just bored one day......). My catback also seemed to help a little.