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Discussing Gas octane in the V6 Mustangs Forum. Ok so I know as fas as pump gas you dont need premium unless your ...

       

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Old May 3rd, 2007, 04:01 PM   #1
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Gas octane


Ok so I know as fas as pump gas you dont need premium unless your tuned for it. So if you do have a premium tune would race gas be beneficial at all
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Old May 3rd, 2007, 04:28 PM   #2
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I'm not sure what you mean by premium tune, but premium gas is for Forced induction and/or higher compression ratio engines. (9.8:1) is where I'd switch from 87 or 89 to at least 91 octane.

If you have the timing pulled back really far, or have it advanced very far, it wouldn't hurt to run premium to reduce the chance of pre-detonation.
 
Old May 3rd, 2007, 04:59 PM   #3
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Originally Posted by 2000Si
I'm not sure what you mean by premium tune, but premium gas is for Forced induction and/or higher compression ratio engines. (9.8:1) is where I'd switch from 87 or 89 to at least 91 octane.

If you have the timing pulled back really far, or have it advanced very far, it wouldn't hurt to run premium to reduce the chance of pre-detonation.
im running 91 octane with a tune for it and my timing advanced by 3 degrees and its running smoother better and more powerful then ever. also has better fuel millage
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Old May 3rd, 2007, 05:12 PM   #4
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Re: Gas octane


Originally Posted by ByPopularDemand
Ok so I know as fas as pump gas you dont need premium unless your tuned for it. So if you do have a premium tune would race gas be beneficial at all
No. Higher octane means the spontanious flash point of the fuel has been raised. It does nothing to add power. What it does is allow you to add more spark before preignition (spark knock). What's where you get the power. Typically you add spark for power and pull spark for fuel economy. Ideally you want to run the lowest octane you can without creating a situation for preignition.
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Old May 3rd, 2007, 05:23 PM   #5
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Well its tuned for 91 now and thats what ive been running
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Old May 4th, 2007, 10:07 AM   #6
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Originally Posted by ByPopularDemand
Well its tuned for 91 now and thats what ive been running
any octane higher then ur tune wont burn 100% efficient
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Old May 4th, 2007, 11:44 AM   #7
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higher octane is never beneficial unless you are tuned for it and 25 bucks a gallon for race fuel is not worth it.
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Old May 4th, 2007, 03:22 PM   #8
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Originally Posted by Juggalo_X
Originally Posted by ByPopularDemand
Well its tuned for 91 now and thats what ive been running
any octane higher then ur tune wont burn 100% efficient
The octane rating is merely a measurement at which autoignition occures and has nothing to do with heat efficiency.
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Old May 5th, 2007, 02:18 PM   #9
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ok i got one to add here, i am hitting the track on the 30th. i have no tune. would it be worth it to put prem in my car?
 
Old May 5th, 2007, 03:10 PM   #10
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Originally Posted by punkafi888
ok i got one to add here, i am hitting the track on the 30th. i have no tune. would it be worth it to put prem in my car?
no
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Old May 6th, 2007, 01:16 AM   #11
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thank you faleen, you never seeze to amuse me! and you just saved me a few bux
 
Old May 6th, 2007, 08:30 PM   #12
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race gas is usually considered about 110 around here. you deffinitly need a tune and time for the to be benificial
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