Bad gas?

MyBlueSTI · 07-17-2017, 02:25 PM

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 · 07-17-2017, 02:30 PM

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 · 07-17-2017, 03:03 PM

Quote:

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 · 07-17-2017, 03:48 PM

Quote:

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 · 07-17-2017, 03:59 PM

Quote:

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

testoster_own · 07-21-2017, 11:38 PM

Many might not agree with me but I stick exclusively to Costco 91 and a gas station around here that sells 94. I am located in the Bay Area. Costco is the only place around here that reliably has legitimate 91. Have had severe issues with every other gas station, LSPI, continued severe timing cut due to knock, everything.

MyBlueSTI · 07-22-2017, 12:15 AM

Quote:

Originally Posted by testoster_own

Many might not agree with me but I stick exclusively to Costco 91 and a gas station around here that sells 94. I am located in the Bay Area. Costco is the only place around here that reliably has legitimate 91. Have had severe issues with every other gas station, LSPI, continued severe timing cut due to knock, everything.

In my area, Costco only sells 87. But my DAM and everything returned to normal after I filled up with shell 92. Old reliable.

07-17-2017, 02:25 PM	#1
MyBlueSTI Scooby Newbie Member#: 345550 Join Date: Jan 2013 Chapter/Region: NWIC Location: Wenatchee Vehicle: 2016 WRX World Rally Blue	Bad gas? 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 * Registered users of the site do not see these ads.

07-21-2017, 11:38 PM	#6
testoster_own Scooby Newbie Member#: 471453 Join Date: Jul 2017 Location: SF Bay Area Vehicle: 2017 WRX Premium Black	Coscto Many might not agree with me but I stick exclusively to Costco 91 and a gas station around here that sells 94. I am located in the Bay Area. Costco is the only place around here that reliably has legitimate 91. Have had severe issues with every other gas station, LSPI, continued severe timing cut due to knock, everything. Last edited by testoster_own; 07-21-2017 at 11:44 PM. Reason: Turned on Notifications

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07-17-2017, 02:30 PM	#2
ewinemiller Scooby Newbie Member#: 427298 Join Date: Aug 2015 Location: SE PA Vehicle: 2016 WRX Limited Dark Grey Metallic	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.