Subaru Enthusiasts Car Club of the Sierras - View Single Post

bigrobwoot · 2009-07-21, 01:14 PM

It is definitely the intake, I remember having the issue after installing it. Although I think the mileage issue is due to my catless exhaust. I left the o2 sensor in, and I have a cel from it. I've read that the engine runs richer when you have the P0420 code, which I have seen to be true. Doesn't make much sense, if your cat is going out then running leaner would save the emissions, not richer. It is what it is tho. I think that is why my mileage improves, not the intake. It has to relearn that my cat is out, and slowly adjust to super rich again.

And I just saw my parents cuz yesterday was my birthday haha

Scott: everything I've read on nasioc says that these are fine without tuning. Obviously I'm leaing power on the table if I don't tune or my mods, but the car is supposed to be fine without tuning. There's a guy on nasioc (Matt Monson) that has everything I have, plus cams, and he's never been tuned and it still runs great. He lives in Colorado, and said that he dynos at the same power as a stock rs at sea level, which I believe is 20-25 over what he had stock

2009-07-21, 01:14 PM	#42
bigrobwoot EJ251 Real Name: Rob Join Date: Jun 2008 Location: Reno Posts: 679 Car: 2019 CBS WRX Premium Class: Middle Shoot for the moon, because even if you miss, you'll still be among the stars	It is definitely the intake, I remember having the issue after installing it. Although I think the mileage issue is due to my catless exhaust. I left the o2 sensor in, and I have a cel from it. I've read that the engine runs richer when you have the P0420 code, which I have seen to be true. Doesn't make much sense, if your cat is going out then running leaner would save the emissions, not richer. It is what it is tho. I think that is why my mileage improves, not the intake. It has to relearn that my cat is out, and slowly adjust to super rich again. And I just saw my parents cuz yesterday was my birthday haha Scott: everything I've read on nasioc says that these are fine without tuning. Obviously I'm leaing power on the table if I don't tune or my mods, but the car is supposed to be fine without tuning. There's a guy on nasioc (Matt Monson) that has everything I have, plus cams, and he's never been tuned and it still runs great. He lives in Colorado, and said that he dynos at the same power as a stock rs at sea level, which I believe is 20-25 over what he had stock Last edited by bigrobwoot; 2009-07-21 at 01:17 PM.