- Wed Jun 24, 2020 3:37 pm
#43910
Sorry to bring up another issue but the original NACA tests during WW2 concluded that WMI did not increase HP unless the ignition was advanced to compensate for the reduced flame speed due to inert steam in the combustion chamber. (If WMI boost = dry boost, HP is the same. More boost would get more HP) In that case it would require some kind of ignition advance table to be used during water injection.
I guess what a lot of people are doing is to use a window of high boost with water injection and advanced ignition and the rest of the ignition map is for low boost without water injection and standard ignition advance. The safety system prevents ever going into the high boost window unless water injection is working. Water injection in the low boost area of the ignition map would be suboptimal.
It's probably not important in racing where low boost is rarely active. On the street water injection can be more of a safety protocol instead of a means for maximum HP, so optimization might not be critical.
I guess what a lot of people are doing is to use a window of high boost with water injection and advanced ignition and the rest of the ignition map is for low boost without water injection and standard ignition advance. The safety system prevents ever going into the high boost window unless water injection is working. Water injection in the low boost area of the ignition map would be suboptimal.
It's probably not important in racing where low boost is rarely active. On the street water injection can be more of a safety protocol instead of a means for maximum HP, so optimization might not be critical.