C16VP race fuel or sunoco 104oct??

[hyperkinesis]

Need some help. My 911 have a chip of 20hp with 91oct or higher and I want a recomendation if I cam use VP c16 with lead mixed with pump gas 91oct to get 95 oct or use sunoco 104oct unleaded
Not for daily use, just to race half mile 2-3 times a year

[Steve@Rennsport]

I would strongly recommend using the Sunoco unleaded 104. This keeps the plugs, pistons and combustion chambers cleaner than the leaded stuff.

Unless your CR is above 11:1, you don't need anything higher than 110. During warm weather, I'd be using the 104, straight, not mixed.

[hyperkinesis]

Thanks