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what happens if you put the wrong octane in a chipped car?

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Old 04-02-2007, 05:33 PM
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pinging & detonation? Maybe a real 'expert' can chime in on the matter.
Old 04-02-2007, 06:25 PM
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Do you mean lower octane or higher octane? And if so what numbers.
Old 04-02-2007, 06:42 PM
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Default the lower octane will increase the fuel's burn rate and have a greater chance of knocking.

detonation is going to occur when the flam front doesn't burn evenly. this will result with having an explosion and increasing the cylinder pressure.

the engine will use knock senors to retard timing so you don't get detonation.

get some higher octane gas....
Old 04-02-2007, 09:27 PM
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Default Yeah, a not-so-bright friend did for a while. His car is fine but it knocked like hell when...

he's step on it. Had GIAC chip.
Old 04-04-2007, 01:56 PM
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Default Re: or it runs like crap with correction factors through the roof and throttle cut at WOT

Read your S-4 operator's manual!
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