Honestly i dont know i was trying to figure that one out myself! i had put the kit on my friends car and set the timing to 16 and it was quick but didnt seem as quick as it should be he was pushing 8 psi and i had a gsr pushing 6 psi and mine felt quicker.so i decided to take the water injection off and i set his timing to like 9 and it is amazing now! i couldnt believe how much it affected it it freed up like 20 hp at least.i have heard other people who are dissatisfied with the WI also. it just doesnt seem to do that well. i would recommend a hondata or even a standalone management unit it may cost a little more but you will benifit much more off of it.these are just my suggestions im sure some will argue but this is what i have come across and i just thought id pass it on.

-Adam