Anybody know about how much more timing you can add if you put 10% toluene in your gas tank to increase octane?
do you think 8*-15* more at peak torque is possible.

 

I was curious about this at one time. I searched and never found the answer. Your best bet would be just ad the tolulene and slowly up your timing and log. Maybe you could get that info for the rest of us?

 

Adding 1 gallon of Toluene to 10 gallons of 93 octane pumpgas results in 11 gallons of 95 octane(R+M/2) mix. Given a motor that is on the threshold of knock on 93 octane gasoline, I doubt that raising the fuel's octane count by two numbers will allow you to advance ignition timing to the extent that you are contemplating.

One of the tuners like Al, Mellon, or Ivey would be able to give you an exact answer. I remember that when I would add 1 gallon of Xylene which has nearly as high of an octane number as Toluene to 92 octane pump gas, I could run 3 more PSI of boost on my Buick GN. I'd guess that you could run maybe 3 degrees more timing at most on 95 octane than you can on 93.