What Happens if you put 87 Octane on 93 tune? - Ford Mustang Forum
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post #1 of 23 (permalink) Old 01-06-2013 Thread Starter
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What Happens if you put 87 Octane on 93 tune?

Hey,
Im just wondering what would happen if you put 87 Octane in on a 93 tune?
If my Mom drives my car once she may put 87 in and am wondering what to do if she does?

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post #2 of 23 (permalink) Old 01-06-2013
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It will probably run lean if you have an aftermarket air intake on it. I strongly recommend against it


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post #3 of 23 (permalink) Old 01-06-2013 Thread Starter
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Well its not like I want to but my mom may do it.
by the time I tune it, it will have- CAI, Long tubes, and an Xpipe

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post #4 of 23 (permalink) Old 01-06-2013
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Lower octane will cause detonation, not a lean condition. I say tell your mom not to put gas in your car, or don't put a 93 octane tune on your car. I'm assuming this is your car and not a shared vehicle?

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post #5 of 23 (permalink) Old 01-06-2013
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Place a sticker on the inside of your gas cap that says 91-93 only


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post #6 of 23 (permalink) Old 01-06-2013
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The engine will be too advanced, when that happens the engine can be damaged. This car should be able to retard the timing but valve damage could still be a possibility. If your Mom is the one putting gas in your car, stick with an 87 tune.
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post #7 of 23 (permalink) Old 01-06-2013
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As long as you don't drive like a madman you could still drive conservatively and shouldn't have an issue. The key would be keeping engine loads light and cylinder pressures down until you can put higher octane gas back in the tank.
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post #8 of 23 (permalink) Old 01-06-2013 Thread Starter
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No its not shared, But sometimes she may end up driving it.
I ordered the sticker! but in NJ we have attendants pump our gas and only they will see it!

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post #9 of 23 (permalink) Old 01-06-2013
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93 OCTANE ONLY

place in filler area.

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low octane in a tuned engine

If it pings when you accelerate, dump a couple bottles of octane boost in the tank!
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You really need to contact the tuner you used and see what they say! The engine has knock detectors in it and with a stock tune it should retard the timing if it senses any spark knock. If that still works with a aftermarket tune there should not be a problem. No just your Mother can mess up, they do likely put the wrong gas in the wrong tank now and then! I haven't seem a post where the wrong grade of gas has ruined one of these motors as of yet. Raw gas is raw gas, what make the difference is the additives they put in it.
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You can drive it IF, you don't get on it. But as has been said, the higher octane tune will have more ignition advance. If you push the motor , you can basically destroy it.
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i think if you let your mother drive it i would put a note in the car saying that do not put fuel in vehicle will permanently damage the engine
and also a sticker on the gas cap

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Quote:
Originally Posted by vicious_worm View Post
If it pings when you accelerate, dump a couple bottles of octane boost in the tank!
This product works, have used on sensitive boat motors and has worked.
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is your mother that stupid that if you tell her "if and blah blah" she wouldn't understand it? Geez if it should happen just put some octane booster in the tank...

btw 99% of the things people worry about never happen....
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