Knock retard - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
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post #1 of 3 (permalink) Old 07-04-2010, 10:52 PM Thread Starter
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Knock retard

Brand new cobalt, 500 miles on it. Sales guy told me i could run 87 octane, so i did for a tank and noticed up to 5 degree's of retard around peak torque, 3000ish rpm. Would this be do to the torque learn down thing i read about or do I have a problem? I filled it up with 94 octane now, and it still gets up to 3-4 degree's of knock retard around WOT @ 3000ish rpms then it goes away once i get up to 4500rpm-6000rpm. Any help would be appreciated.

Oh, and car is 100% stock. The mods in sig haven't been installed yet.

2010 Cobalt SS, Trifecta tune, clear image CAI, clear image DP.
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post #2 of 3 (permalink) Old 07-05-2010, 01:10 PM
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well the guy that told you to run 87 in it is not very smart. There are high out put motors and should only be useing 93.. Add some octane booster to it for the next few tanks til all that 87's out.

I was beat by RKRamos.
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post #3 of 3 (permalink) Old 07-05-2010, 05:01 PM
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i switch off between 91 and 93 havnt had an issues :/ gas stations are next to each other 1 day this ones 3 cents cheaper other days the other is lol im cheap haha . last gas i got was ehh 2 weeks ago paid 2.75 for 93 cheap as hell compard to the 3.01'sat the rest of the stations in my area well not cheap as hell but u know what i mean saying theres 6 within a squar block lol
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