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> Octane Rating
lukej777
post Jan 4 2007, 04:47 AM
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Hello, I am a new member and own a mitsubishi mirage x 1992. I have lost the manual and cant find it anywhere. Can anyone tell me if putting 98 octane fuel instead of 91 in it will have any affect? Will the car even run with it in it. The reason I ask this is because the engine sounds like its detonating a lot so am a bit concerned about that.
Thanks.
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DFBonnett
post Jan 4 2007, 09:31 AM
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Higher octane won't hurt but probably won't help either. If the octane requirements of Mirages delivered to Oz are the same as to the US, then it should run fine on the lowest octane commonly available. Typically in the US the lowest rating is 87, followed by mid-grade at 91, followed by premium at 93 or 94. I don't know how octane ratings are done in Oz.
You might want to check the ignition timing. Advanced timing will give you a ping for sure. Could a previous owner have advanced the timing hoping to generate more power?
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lukej777
post Jan 5 2007, 02:41 AM
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Hello,
Thankyou for your response. The octane ratings are the same in both yours and my country. I currently have it running on 91. I guess the pinging could be a timing issue for the sparkplugs because the engine runs on sometimes when I turn it off. It will keep running when I turn off the ignition so I might get that looked at. Would it be exspensive to get the timing altered?
Thanks.
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DFBonnett
post Jan 5 2007, 08:47 AM
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The run on is troubling. Is the car overheating at all or are the temps higher than usual? It could also be caused by advanced timing. Has it done this since you've had the car or is this a new issue? Does the temp gauge rise significantly if you sit at idle?
Setting the timing is a simple procedure, about 15 minutes, so it should be inexpensive.
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lukej777
post Jan 5 2007, 06:52 PM
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The car is not overheating at all. The temperature is normal at all times. I think that it is most likely just a timing issue. Yes this problem has been with the car since I took ownership of it. Thanks for your help.
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danny fields
post Feb 13 2007, 06:41 PM
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QUOTE(DFBonnett @ Jan 4 2007, 09:31 AM)
Higher octane won't hurt but probably won't help either. If the octane requirements of Mirages delivered to Oz are the same as to the US, then it should run fine on the lowest octane commonly available. Typically in the US the lowest rating is 87, followed by mid-grade at 91, followed by premium at 93 or 94. I don't know how octane ratings are done in Oz.
You might want to check the ignition timing. Advanced timing will give you a ping for sure. Could a previous owner have advanced the timing hoping to generate more power?
[right][snapback]81177[/snapback][/right]

ok you are talkin complete dribble lol right for a start the minimum they should run on is 95 as the average octain in japan is 100 upwards it even has it in the fuel caps lol on most models as far as performance like any other petrol injected will absolutly love it better performance and faster car :) my gti flies wen on shell optimax which is 97 or 98 here in uk oh and the mivec cyborg 1.6 struggles anythin under 97 :)
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