I have a Evolution Motorsports 600 tune in my Turbo. I ran MS109 last year in it and the car ran excellent. I bought a couple cans of MS109 again this year and wanted to be sure that my tune adapts/adjusts to the higher octane fuel. Would like to be safe and not cause any problems. Also is it safe to have a MS109 in the fuel tank/fuel system for a week or so until used up? I usually run 50/50 (pump/VP.)

 

Yup, it will adapt on its own, to higher and lower octane (if you have a 93 file and run 91). Just do 4-5 hard pulls after filling up any the ECU will adjust to the appropriate map. We rate the car at an 18hp and 31ft-lb increase from pump to race fuel.

 

Appreciate the quick response. I'll try straight MS109.