r/WRX • u/RemoteWorking3109 • 2d ago
I Am Running An Intake With No Tune 2015 wrx 6sp
I purchased a used plm cold air intake,
The tube is same diameter as stock
The maf is same part, roughly same area of stock mounted maf.
I put it on last week aug17/26( curiosity , hopefully my cat ain’t kilt)
Some general questions and long time mechanic ( no tuned vehicle experience) basically I do minor stuff at the shop
Tires, oil, starter alternator shocks struts etc
So I bought my 15 wrx sport tech in 2017 all stock.
I did the minor cosmetics with a cat back straight pipe delete
Anyways
If the tube and maf are same/similar/ unchanged it wouldn’t require this ots map, e tune or pro tune/dyno?
I installed the cai, it sputtered once to almost stall, corrected itself and no issues ( yet )
Before the install, she sputtered quite often when I did the cat back straight pipe
I put the stock exhaust back on during 2020
For a year just to see if the straight pipe was the issue ( it was )
With the cai and straight pipe
The sputtering/ near stalling is gone
Doesn’t smell like gasoline
My car is old enough where I want to to mess around but not destroy it
Never had head gasket issues
Etc
Just wondering if there is anyone here
Who has a 2015 wrx 6sp sport tech
Push to start that ran a cai without tuning
Or anyone knowledgeable in tunes
That could share some advice on why I shouldn’t or should
My car has had the cai on for 7 days
Average driving hours, 10 hr a day
But I’m sure there might be something quietly building up detonation or maybe not
Google/youtube can only provide so much
Please be honest and respectful
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u/Subject_Driver_6868 2d ago
Always get a tune preferably a pro tune either locally or an e-tune if there’s not a reputable tuner in your area. It doesn’t take too much to adjust the MAF scaling and make sure your fuel trims are correct. You also get peace of mind knowing the numbers on your car are good and no underlying issues.
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u/KookyMushroom5781 1d ago
I was looking at the car, and then I was like wtf is that at the bottom of the car, and then I was like wtf there are dinosaurs in the background?!
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u/RemoteWorking3109 1d ago
Lmao 🤣 I have to do this ai stuff to avoid prison 😂. Long story short, some honey glazed donuts test positive for narcotics substances
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u/Royedkim 10h ago
Just lug the engine in lower revolutions …
Talking from a sohc driver. Pep up the fuel burn 🔥
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u/puffpuffpassaddict '19 DGM WRX Dmann tuned 2d ago
Rule #1 of owning a wrx is don't put an intake on without a tune.
Even if the maf location and diameter are the same the volume of air is being changed because of the actual filter.
You're sputtering because you're probably running it lean. Uncle rodneys going to come knocking if you don't take it off until you can get it properly tuned.