Quote:
Originally posted by sixgun86gn
First time I have ever seen a step by step for tuning alky.Very good.
Now what would you suggest to those that would be using something like a FAST or DFI?
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EDIT 7-16-05.. wanted to make some changes to statements made
On the Buick, my target at 11.3 netted a 27 MPH pickup from 99 to 126. On LS1's the target has been 11.9. On some DSM's i've seen the target at 12.4. So the target varies from one vehicle/platform to another.
Ahh this is even easier with a FAST. Well at least Cal makes it look easy
Set the program to 11.9:1 AFR and have it automatically pull fuel out to correct while the system is spraying. When you go WOT.. instant correction. Every pull you do after you'll keep adding alcohol.. have it pull additional fueling.
If you did a before and after.. target around a 25% fuel replacement should get you the numbers you want.
Doing the tuning using race gas with the alcohol will get your injector DC squared away.. then lean out the octane if you wish and watch for knock retard/egt abnormalities.
Another neat thing to do if your only using race gas with the alcohol.. and looking for cooling.. keep an eye on your IAT readings in your intake and add enough alcohol until your at ambient at WOT or hit the 25 % fuel replacement replacement. If the small IC is doing its job.. probably at 15% you should be there at 25 PSI. The having your cake and eating it too is getting ambient on 93 octane.
Going to a nice stock location like the PTE, Thunder Fab, etc... you'll be more than covered temp wise with an alcohol system.
If you have spark knock.. you need more alcohol. And when the motor is making above 650-700 RWHP expect to get into an additional nozzle to really pump it in. If the IC and the motor is not that efficient.. dual nozzle may be required in the 500 HP range using pump gas. This depends on too many factors. Fuel system plays a major part as well. If the pump cant deliver enough pressure or volume.. then.. the fix is adding extra nozzles or revamping the entire fuel system.
FWIW, my car runs a Walbro 307. Guess whats making up the extra fueling