hi fellas!
just got back from the track weekend; car ran superbly, and it was hot hot hot out here on the east coast -- over 85 degrees on sunday.
i ended up tuning it for what i considered "very safe". without the water engaged, i had A/F from 4000 to 7000 rpm typically 11.5 tapering to 11.0. with the water, 10.8 down to 10.0. the addition of the water seems to really make the wideband see almost a point richer condition.
i ended up using a much smaller nozzle, rated for 1.9 gph at 40 psi; i was driving it at 100 psi, so i am not really sure how much it was flowing above 1.9 gph. i had the activation point set for 11 psi. no bogging was evident anywhere; that i can say for sure. i was using about 3 liters of straight water every 25 minutes or so of tracktime. fuel was 93 octane pump gas.
observable results were the following: car seemed to pull the same in the morning (60 degrees ambient) as it did in the afternoon runs (85 ambient, and a very hot track temp surface, maybe 120 or so). i have no boost controller, so the oem computer is in charge of that. i never saw or felt it pull boost, which it does if it sees detonation. i am fairly certian detonation was not occuring....
next step is to really tune it a little more aggressively for power; i just wonder how to go about that; should i tune with the water engaged and shoot for an A/F of about 11.5? then go and do some more torture testing at the raceway and see if boost is pulled, etc?
so far, i am very please with the results!
thank you all for the help.
todd
ps as a side benefit, it seemed to get much better fuel economy than i expected on track. i thought it would be around 8 mpg; was doing about 12 mpg.....
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