FAST is pulling fuel but

[SIXBANGR]

my A/F says I am a hair lean. A/F is 11.5 at 18lbs of boost. The FAST is pulling about 8 or 9%. My alky gain knob is set at 5. I had the dual nozzle but just changed it to a single since i have now gone from 28 to 18lbs of boost. It is way closer to the numbers I need now tuning wise. EGT was at 1500.

 

[bison]

So whats your target a/f in the map? If its pulling fuel then you are richer than the target. What is your desired a/f? If you say its lean then you should lower your target a/f in the cells at that engine load. If your seeing excessive correction after you change your a/f targets you will need to go into the v/e table and adjust those also.

 

[Razor]

my A/F says I am a hair lean. A/F is 11.5 at 18lbs of boost. The FAST is pulling about 8 or 9%. My alky gain knob is set at 5. I had the dual nozzle but just changed it to a single since i have now gone from 28 to 18lbs of boost. It is way closer to the numbers I need now tuning wise. EGT was at 1500.

The alky is like a fuel. So if you tune the motor then shoot alcohol.. it will richen the mixture. So it is normal to see a negative correction.

Now alcohol has a lower stoich than fuel, so you need to lower your target.

Most Buicks I start at 10.5:1 AFR and work from there as performance increases. So set your target AF to 10.5 in the WOT cells above 16 PSI and 4000 RPM's and then adjust your VE to get you where you need to be. From there you look at MPH and if you move your target to lets say 10.8 and the MPH increases your on the rite track. When the MPH stops going up.. you reached the sweet spot and back down the target.

Maybe said like this, with my kit.. you put the twin nozzles on.. set the knob to 6. and the only thing you do is purge before racing and tune your computer. Thats it. If someone messed with the internal controls, then call me and i'll assist with reseting them.

HTH

Julio