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Discussion Starter #1
Hello, I have a 2015 WRX with 120000kms. Ill have a list of mods at the end. Im experiencing an issue where when I reach around 5k+ rpms, the car starts to stutter pretty badly. I replaced the spark plugs, new air filter and cleaned the maf, just put on a fresh turboback exhaust with a fresh cat, all of those have failed to solve the issue. I should also mention that the car stalls alot when coming to a stop. I have a feeling its possibly the fuel system but im not certain. I dont wanna keep dumping cash into the car without having a solid feeling of what the issue is. I'm running the OTS stage 2 tune from the accesport since im located on pei in canada and theres no tuner for subarus anywhere around here. Boost levels seems normal and theres no check engine light. I have a datalog of when I did a WOT pull but I cant attach it in the post so if ur interested u can email me [email protected].
Mods:
Perrin Charge Pipe
ETS Intake
Mishimoto J Pipe (catted)
SubieDepot Cat Back Exhaust
GFB Respons Blow Off Valve
Thanks,
Chris
 

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Discussion Starter #2
I also should mention that the car seems to be running very rich, a lot of soot in the exhaust pipes and spraying in a light mist
 

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Just to start the intake you have isn't supported by the tune you have for sure. The bov isn't helping anything either as the ecu only supports full recirculation
 

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Discussion Starter #4
I can set the blow off valve to recirculate all the pressure back into the engine. Ya I agree that the intake is not supported on the tune but I don’t think that would be the main reason for the troubles.
 

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Well, your car has no idea how much air is there to provide fueling for. If I were going to take a stab in the dark I'd guess that's probably not good. Especially since intakes fudge the MAF sensor to make the car run leaner.

Probably a solid first place to start
 

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Your problem could be any number of things, but unless you get the car tuned specific to that intake or buy a Cobb intake it's always a possibility. In fact I'm surprised you've got enough guts to run out a improper tune when engine replacements cost upwards of 10k.

You need to check the entirety of the intake and vacuum systems
 
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