Al or anybody with experience on tuning there car with race fuel.
I will most likely be using a emanage or afc to lean out my a/f with race fuel. I will be running 20psi and utilizing 110 octane. I was thinking of aiming for 12.5?
Is this to lean or dead on?
Thanks
terry

 

It depends on your car and the timing you run - I like to listen for knock and tune to work with the individual car - usually I run 12.1 on c-16 on my own car

 

thanks, I just have a dynoflash....so I will not be controlling the timing. Other than that a cone intake and turbo back. So a 12.0 should be safe for me? I am really good at listening for knock on cars but I do not have device for detecting knock. I have never heard any hint of knock/detonation on my car. Is it difficult to listen for it on the evo? Is the easiest way to listen for it with the windows up on the evo.

 

If you can hear the detonation, its likely already pretty severe.. you need some sort of device like the Knock-Link or a setup like the TurboXS Tuner which has a built-in knock sensor.. Even the S-AFC-II is capable of it by tapping off the stock knock sensor to the ECU but I'm not certain how good it is or what is involved in calibrating.. Basically something that amplifies the noises inside the engine and can detect the knock before its severe enough to do damage.

 

Thanks!
I will look into the safc-2's accuracy on the knock count. My old WRX had a utec and the dattalogging knock indicator was a very valuable tool for tuning. I just did not want to fiddle with this car that much and thats why I got a flash. I had my WRX running on c-16 at about mid 13's a/f and agressive timing with zero knock. My turbo s2k with stock 12:1 compression at 9psi on c16 stock timing was at zero knock as well. I know every motor is different but 12.1 a/f on race fuel does seem very conservative.
MalibuJack I know you have done extensive tuning what is your target a/f on race fuel?

 

I agree 12.0 whould be fine on race fuel - provided you have proper race fuel - I use C-16 only

What AMAZES me is that some tuners of evos run 12/ 1 a/f's on evos with pump gas - - nice for one or two dyno pulls - but it won't be very smooth after 10 minutes of driving

 

For those of you looking to save some money on race gas, try water injection out. A lot cheaper in the long run and you can run more boost and timing advance with even straight Poland Spring, not to mention if you do a 50/50 water/methanol mix.

You can piece together a cheap, but functional system off a pressure switch.

Plus, you don't have to worry about replacing 02 sensors from all that C-16. :-)