Hey I have a 2013 WRX with 41,XXX miles and I am getting some weird hesitation/stumble between 3500-4000 rpms on quarter to half throttle.
I am tuned on *93 pump gas Shell or BP only) by Graham Gaylord who is the owner of Boosted Performance Tuning who is a very reputable tuner. He told me it is most likely a mechanical issue which is why I am now here to ask for help!
Oh also no check engine lights or codes.
Mod list:
Cobb AP V3
Perrin top mount
Invidia catted downpipe
Perrin 1.75 uppipe (NON Catted) (NO EWG)
Grimmspeed 3 port ebcs
KS Tech 73 MM Big MAF CAI (With Heatshield) (Ceramic Coated)
Tial QR Recirculating BOV
ID1k injectors
DW65C fuel pump
Perrin Turbo Inlet
TGV deletes
Air Pump Delete
NGK 1 Step Colder Plugs
So far I have replaced my MAF Sensor, Front O2 Sensor, I have done a Smoke Test (no leaks), I am hitting target boost, my vacuum shows -22 at idle, I replaced my plugs with 1 step colder, my battery voltage is between 13.2-14.4 (optima yellow).
This only happens on partial throttle between 3500-4000 rpms and I don't feel any hesitation or stumble on WOT
I don't know what to do anymore... Please help!
I am tuned on *93 pump gas Shell or BP only) by Graham Gaylord who is the owner of Boosted Performance Tuning who is a very reputable tuner. He told me it is most likely a mechanical issue which is why I am now here to ask for help!
Oh also no check engine lights or codes.
Mod list:
Cobb AP V3
Perrin top mount
Invidia catted downpipe
Perrin 1.75 uppipe (NON Catted) (NO EWG)
Grimmspeed 3 port ebcs
KS Tech 73 MM Big MAF CAI (With Heatshield) (Ceramic Coated)
Tial QR Recirculating BOV
ID1k injectors
DW65C fuel pump
Perrin Turbo Inlet
TGV deletes
Air Pump Delete
NGK 1 Step Colder Plugs
So far I have replaced my MAF Sensor, Front O2 Sensor, I have done a Smoke Test (no leaks), I am hitting target boost, my vacuum shows -22 at idle, I replaced my plugs with 1 step colder, my battery voltage is between 13.2-14.4 (optima yellow).
This only happens on partial throttle between 3500-4000 rpms and I don't feel any hesitation or stumble on WOT
I don't know what to do anymore... Please help!