bmweater

Hey guys random question:
I have a drum of C12 racing fuel from VP, do you think i could use it to balance out the horrible 91 octane of California? I was thinking 1 Gallon for every 10 of 91. Its for a stock 98 C4S....any thoughts?

mongrelcat

Yes, do a search to find the formula. I think once you're at 93oct there's no point in going any further unless you have a modified map.

I use 4 gallons of Trick 101 to make a full tank (92oct standard) once in awhile just to give the car a break and run at full potential on 93+. I figure it lived in 91-land all it's previous life and deserves some good stuff in it's old age.

mongrelcat

Also, it goes without saying but just in case; make sure your race fuel is unleaded. Anything here over 101 is leaded (from what I've found anyway.)

ltc

C12 is leaded!
http://vpracingfuels.com/fuels_leaded.asp
C12
The best all around racing fuel made. Recommended for CRs below 15:1, satisfying the needs of 75% of today's race engines. One of the winningest fuels in racing history, including Modified Tour, GNN, D.I.R.T., Indy Lights, NHRA, AMA as well as other local and national championships across the U.S. and around the world.

* Color: Green
* Motor Octane 108
* Specific Gravity: .717 at 60° F

C10 is not:
http://vpracingfuels.com/fuels_unleaded.asp

ltc

Octane mixing chart and downloadable excel spreadsheet:

http://www.gnttype.org/techarea/misc/Octanemix.html

bmweater

Thank you for the awesome links!