race gas question
08-10-2014, 07:56 AM
#1
race gas question
Was wondering what the mixture of race gas and 93doctoIs that can be safely run in our cars. I have a renntech tune if that helps any?
Or is there even a safe mixture without a map to support it?
Or is there even a safe mixture without a map to support it?
08-10-2014, 06:30 PM
#3
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
You can use unleaded race gas any time you want. No harm whatsoever. My car LOVES Sunoco 260GT Plus (104 octane unleaded).
08-10-2014, 08:53 PM
#5
With oem tune anything beyond 95-96 is pointless
The timing can't be advanced enough to take advantage of it
Octane does not equate to energy content
It is an index of knock resistance
The higher the octane the more it can be can be compressed, ie, the hotter it can get before compression ignition
The higher the more you can advance timing towards TDC
The higher the compression the more energy when ignited
The timing can't be advanced enough to take advantage of it
Octane does not equate to energy content
It is an index of knock resistance
The higher the octane the more it can be can be compressed, ie, the hotter it can get before compression ignition
The higher the more you can advance timing towards TDC
The higher the compression the more energy when ignited
Last edited by Ingenieur; 08-10-2014 at 09:02 PM.
08-11-2014, 04:54 PM
#6
Awesome I was thinking starting off slow with 98 and seeing how it feels than Sunoco 260gt was gonna be my next choice. I'm shocked that we don't need a tune to run race gas in our cars. Luckily I'm tuned tho so glad that'll help.
I'm only gonna try this at the track so I can get a better 60', the bog is still horrible with the m/t s.
I'm only gonna try this at the track so I can get a better 60', the bog is still horrible with the m/t s.
08-12-2014, 03:04 PM
#7
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96 and 08 911 turbos
keep in mind that race fuels of varying types don't have the same stoich a/f as street fuel, so you'll want to tune if you are adding more than a splash (which won't help anyway on a a stock car unless its pulling timing through knock retard).
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08-12-2014, 04:41 PM
#8
Super Member
With oem tune anything beyond 95-96 is pointless
The timing can't be advanced enough to take advantage of it
Octane does not equate to energy content
It is an index of knock resistance
The higher the octane the more it can be can be compressed, ie, the hotter it can get before compression ignition
The higher the more you can advance timing towards TDC
The higher the compression the more energy when ignited
The timing can't be advanced enough to take advantage of it
Octane does not equate to energy content
It is an index of knock resistance
The higher the octane the more it can be can be compressed, ie, the hotter it can get before compression ignition
The higher the more you can advance timing towards TDC
The higher the compression the more energy when ignited
08-13-2014, 12:26 AM
#9
MBWorld Fanatic!
lol. I like the e85 comparison tests too. How about a comparison of fuel with 10% ethanol added and fuel w/o (id really like to see that). Yes higher octane typically has less btu's or energy by volume but burns slower hence the knock resistance and needing more of it. As for fuel mileage i have no idea why a higher octane would ever yield higher mpg that's sort of counter productive. Although maybe with much higher quality fuel we'd get the lean burn benz engines that run like 28:1 afr's temporarily which do get better mpg.
