Question about race fuels
Jan 30, 2012, 09:30 PM
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Question about race fuels
Track day this weekend at Big Willow, want to throw in some race fuel to get ~93-94. Searching locally I can only seem to find leaded 5gal cans (VPR, 110, C12). No one seems to carry 100 at the pump anymore. If I have a HFC, is there any danger from putting 3 gallons in?
Jan 30, 2012, 10:29 PM
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Good question. It used to be much simpler. I had a Mustang w/ high compression and could only run one brand of 93 when I lived back east. I threw 2 gal's of 105 in all the time. Anything to keep it from knocking. 
With as edgy as tunes are with this advanced hardware, I would put my money on testing the fuel mix with a stock tune over a base map or otherwise. If you're a 91, mix for 93/4 at first. The cars are factory tuned for either technically.
With as edgy as tunes are with this advanced hardware, I would put my money on testing the fuel mix with a stock tune over a base map or otherwise. If you're a 91, mix for 93/4 at first. The cars are factory tuned for either technically.
Jan 31, 2012, 12:10 PM
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They do have a pump there! I had heard as much, but couldn't find any info on prices, etc. Kinda like you can rent a snowboard in town, or you can rent one on the mountain....for 3x' as much 
Every time I've gone I fill up at the gas station off the freeway next Jack's.
Thanks!
Every time I've gone I fill up at the gas station off the freeway next Jack's.
Thanks!
Feb 1, 2012, 09:21 AM
#8
^That does not make sense to me...
The computer will advance timing and a/f ratio for a 91 octane setting. The knock sensor will pull timing if knock is sensed.
The computer will not advance timing past a 91 octane setting just because no knock is sensed...
So, tuned for 91 octane means 94 octane has no benefit (over 91) nor would 100+ octane or...
What am i missig? I admit - it is my first FI car - so i am eager to learn.
The computer will advance timing and a/f ratio for a 91 octane setting. The knock sensor will pull timing if knock is sensed.
The computer will not advance timing past a 91 octane setting just because no knock is sensed...
So, tuned for 91 octane means 94 octane has no benefit (over 91) nor would 100+ octane or...
What am i missig? I admit - it is my first FI car - so i am eager to learn.
Feb 1, 2012, 09:26 AM
#9
^That does not make sense to me...
The computer will advance timing and a/f ratio for a 91 octane setting. The knock sensor will pull timing if knock is sensed.
The computer will not advance timing past a 91 octane setting just because no knock is sensed...
So, tuned for 91 octane means 94 octane has no benefit (over 91) nor would 100+ octane or...
What am i missig? I admit - it is my first FI car - so i am eager to learn.
The computer will advance timing and a/f ratio for a 91 octane setting. The knock sensor will pull timing if knock is sensed.
The computer will not advance timing past a 91 octane setting just because no knock is sensed...
So, tuned for 91 octane means 94 octane has no benefit (over 91) nor would 100+ octane or...
What am i missig? I admit - it is my first FI car - so i am eager to learn.
Feb 2, 2012, 05:59 AM
#13
Okay. Just from previous experience 'some people' on other forums* have said [quote] Iahma gonna' put sum 104+ octane and really put donw sum mad powah, yo.[unquote] 
and i have had to gently disabuse them of that theory.
*Mazdas247.com and every honduh forum
and i have had to gently disabuse them of that theory.
*Mazdas247.com and every honduh forum
Jul 28, 2013, 06:08 PM
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when the time comes to get my tune, I wanted to run 2 tunes. one for 93 and the other for c12. i have a station by me and even tho its pricey i would like to run it when i race. i have no cat on my car. besides that, would running c12 be a safe race fuel? if its not worth it i will stick with 93