I first tuned the car using water alone and an AFR of 12.5, then switched to 50% ethanol. On the road you could feel a difference (more power or more "happy engine" somehow).
I then tried different timing curves and find out I could run more timing when using more mix, this to have zero knock retard.
On the dyno... surprise! Timing and mix quantity had no influence on the power. Not a single HP!
Right now I run the lower timing for max power with the minimum amount of water/alcohol. The wideband shows about 12:1
Actually it's 6GPH and 17* timing advance (this for a 98 LS1 engine).
Stefano
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98 Convertible Trans Am
MODS: SC raptor hood, 35th decals, Vortech V9 G-Trim SQ, homemade water-alcohol injection, Corsa catback, Eibach springs
DYNO: 410 RWHP, 417 TORQUE @ 5 PSI
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