S2000 Talk Discussions related to the S2000, its ownership and enthusiasm for it.

Racing Fuel?

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Old Jun 20, 2006 | 01:31 AM
  #11  
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There is a theory I've heard more than once that running too high of octane can actually lead to some fuel not being burned... thus reducing your mileage and even HP numbers.
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Old Jun 20, 2006 | 02:14 AM
  #12  
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Originally Posted by jzz30,Jun 20 2006, 10:11 AM
you should run 100 octane IF you have ultra high milage and LOTS of carbon deposits in the combustion chamber from driving like a grandma!
Alternatively get your head and injectors cleaned using a fuel additive with good detergent properties.
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Old Jun 20, 2006 | 07:32 AM
  #13  
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Originally Posted by jzz30,Jun 20 2006, 05:11 AM
you should run 100 octane IF you have ultra high milage and LOTS of carbon deposits in the combustion chamber from driving like a grandma!
That's quite untrue, high milage means more carbon deposits usually which causes higher overall compression ratio and makes it seem like you need higher octane because the engine might possibly ping. What you need to do instead is just gun it for a bit to break some of the carbon free. Adding 100 octane is only a slower burning fuel and wont do much to remove the deposits.
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Old Jun 20, 2006 | 08:35 AM
  #14  
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higher octane fuel resists detonation, higher compression causes detonation, detonation causes power loss from fuel not igniting when it should. once you prevent detonation you will gain very little to no horsepower with higher octane fuel. so if fuel with a 91 octane rating will prevent detonation in a stock s2k, why use any higher?
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Old Jun 20, 2006 | 09:15 AM
  #15  
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i'll add my experience but lack of knowledge!

i always ran 93 in mine...at a track day i filled up and went through a full tank of 100. my lap times were the same. the car didn't do anything differently. no check engine lights or anything. i remember it smelling a little better though! not quite the 116 smell but sweeter.
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Old Jun 20, 2006 | 10:05 AM
  #16  
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Originally Posted by WVtwisties,Jun 20 2006, 10:15 AM
i'll add my experience but lack of knowledge!

i always ran 93 in mine...at a track day i filled up and went through a full tank of 100. my lap times were the same. the car didn't do anything differently. no check engine lights or anything. i remember it smelling a little better though! not quite the 116 smell but sweeter.
Did you reset the ECU after you filled up with the 100 and before you ran the track?
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Old Jun 20, 2006 | 10:25 AM
  #17  
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Originally Posted by Hockey,Jun 20 2006, 10:05 AM
Did you reset the ECU after you filled up with the 100 and before you ran the track?
no
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Old Jun 20, 2006 | 10:28 AM
  #18  
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It doesn't matter if he reset the ECU... it would be like putting 93 octane into a Civic and expecting it to make more HP. If it already makes max power on a certain fuel without detonation then it will not make any more power with a slower burning fuel without some type of power adder through either higher compression or FI.
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Old Jun 20, 2006 | 10:53 AM
  #19  
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Originally Posted by kane.s2k,Jun 20 2006, 05:32 AM
That's quite untrue, high milage means more carbon deposits usually which causes higher overall compression ratio and makes it seem like you need higher octane because the engine might possibly ping. What you need to do instead is just gun it for a bit to break some of the carbon free. Adding 100 octane is only a slower burning fuel and wont do much to remove the deposits.
so whats wrong with what i said...
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Old Jun 20, 2006 | 11:06 AM
  #20  
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a mechanic told me the s2000 has a high enough compression that it may benefit from a higher octane than recommended...and certainly won't hurt it...so when i was at the pump i figured for about the price of a lap dance i could possibly have better performance and definitely not hurt my car....that was my reasoning.
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