Thread: Best fuel?
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Old 07-23-2010, 11:26 PM   #21
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Member#: 168129
Join Date: Jan 2008
Chapter/Region: SCIC
Location: High Desert
2013 WRX


Originally Posted by Patrick Olsen View Post
Yes, something is wrong with your car. When I read your comment the first time I missed that your car was a newer model. If it's actually knocking and pinging then the knock sensor isn't doing its job. Normally a dead knock sensor would pretty much put the ECU in limp mode, pulling a lot of timing to keep the engine "safe", so the fact that you're not getting a CEL and not seeing horrible performance indicates that something is definitely not right.

Except for the post-production additives, which I'm pretty sure is what this thread is about.
Patrick, as much as it pains me to say this.....Your wrong.

The 06+ 2.5i's run like hammered dog crap on 87. They ping and thus pull timing on loads at certain RPM's. Switching to 91 this week I noticed an instant difference. This has also been logged by several people.

Also the IAM's are higher on our newer models while running higher octane.

I'm not talking about a ferrari vs honda difference but in layman's terms the car is happier on high octane
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