Bad gas?

[MyBlueSTI]

I recently filled up with 76 92oct because my options were limited. I'm currently running MAP Stage 1, with everything else stock. My commute is 55 miles one way and I'll usually see low cruise knock (1.41- 2.81) and DAM stays at 1. But recently, my Dam dropped to .875 then again to .812 and my feedback knock was at 2.81 as soon at i started the car. I usually only fill up at shell or chevron and change oil every 4K with PUP 5w30. Car has 16,500 miles on it. This is the only issue I've had

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[ewinemiller]

Yes. I have the same problem if I use Sunoco, DAM drops, lots of knock, even running a 91 octane tune on what they call 93.

Shell keeps the DAM solid 1.0.

[MyBlueSTI]

Originally Posted by ewinemiller

Yes. I have the same problem if I use Sunoco, DAM drops, lots of knock, even running a 91 octane tune on what they call 93.

Shell keeps the DAM solid 1.0.

Awesome. Thanks for your response. I have a tank full of this crap, but shell will be my next fill.

[rtv900]

Originally Posted by MyBlueSTI

Awesome. Thanks for your response. I have a tank full of this crap, but shell will be my next fill.

fill it up on a half tank, it will still help if it is bad gas

[MyBlueSTI]

Originally Posted by rtv900

fill it up on a half tank, it will still help if it is bad gas

Will do. I actually thought of adding octane booster. But I figure it's best to ride it out and get back on the shell