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91 Octane vs. 93 Octane with Chip Question - Urgent / On Road Trip!

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Old 08-07-2007, 07:36 AM
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WJM
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Default You'll be fine with a quality 91 octane

Under hot days repeated boost you might exceed the timing pull, but honestly 2 octane pts isnt going to do anything, except run less than efficiently
Old 08-07-2007, 07:40 AM
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what year is your car?
Old 08-07-2007, 07:53 AM
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Default Yeah, that's what sucks about living in KS, no 93. You can get 92 at BP stations though.

But I just buy 91 at shell stations.
Old 08-07-2007, 08:03 AM
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Default That is fine for 91 found in the midwest and east coast

but 91 here on the west coast is more like 8 points worse then EC 93 octane. He will want to change over to a 91 octane chip once he gets to CA.
Old 08-07-2007, 08:22 AM
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Default Hmm same thing happened to me. my dad put 87 into my 91 octane programed chip

the car stutters...but doesn't knock under full throtle
Old 08-07-2007, 09:07 AM
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it's a 5-minute DIY. You could by the necessary tools for the cost of having them replaced once.
Old 08-07-2007, 10:35 AM
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Default Yeah, just not a good idea... get the 91 OCT chip... your problem is the wrong plugs though...

get a copper core plug... you have to change them more often but they dissipate heat well and help to avoid predetonation. Make sure the gap is correct.

Although, I ran mine for 15K once... no probs.
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