what kind of gas is everyone using? I've been running 93 octain ever since i bought the car. has anyone been running anything less?
thanks
biker

 

Biker,

I use 93 or 94 octane ethanol blend (whichever I can get based on availability) to allow me to run my base timing at just under 11° BTC without retard from the ESC. I'd have to back off with 91, and wouldn't use anything less if I didn't have to. I believe the owner's manual recommends 91 for a good reason.

 

I used to use Premium, now I just stick the cheap stuff in there. I have 8.5:1 compression, which I thought you don't have to use high octane with low compression, is this right?

 

I guess I'll just stick to the good stuff. thankfully I'll be moving soon so the drive to work will be like 2 miles instead of 20. So I can afford the good stuff
later
biker

 

There is no more energy in 87 octane fuel than there is in 92. The fuel produces the same amount of BTU energy. Octane is the fuel's resistance to detonation (knocking).

You only need enough octane to eliminate detonation. Unfortunatly with today's EFI engines with knock sensors, you'll never know if the engine knocks unless you use a scan tool to monitor the engine. This will also let you run low octane 87 fuel with no problems.

When the knock sensor detects engine knocking, it retards the timing to reduce the knock. This retarded timing will also reduce performance. Switching to a higher octane fuel will reduce the amount of knock and produce more power simply from the fact that the computer isn't retarding the timing.

Using a fuel with a higher octane rating than required is just throwing your money away. If your engine doesn't knock with 89 then 92 isn't required.

 

good point
All i know is if I put anything under 92 in my bike she will spit and cough and run like doggey doo doo.

 

My car runs like a raped ape on Klotz Racing Gas Concentrate!

Going from 93 octane to 93 blended with concentrate I could feel a diffrence when the pedal was mashed to the floor!

 

Now the way I understand it the octane represents the speed that the fuel burns. Where as 87 octane burns faster than 93. So if your engine will run on 87 WITHOUT knock then it will make more power than 93. So the lower octane you can use without knock the better. I have to use 93 in my car. My best friend had a carbed 85 mustang and it ran best with 86 octane and 15 deg. of timing, sometimes more. I run 12.5-13 deg with the knock sensor disabled. hope this helps

nick