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Originally Posted by Andrew
AKWRX, thanks for your reply. Can I ask what the ratio of alcohol/water injection to fuel is on the car that you mentioned?
I'm not really sure where to proceed from this point. My concern is that my EGTs approach 1600 F near redline with an AFR of 11.1-ish (on wideband), with water injection. I would like to lean the mixture out but my EGTs are high enough that I don't think I have any room to move. Can you suggest a method of safely moving to a leaner mixture?
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You asked the $64,000 question. Honestly don't know exactly what the ratio of injected alcohol/water to fuel is. My system starts injecting at about 6 psi boost, and ramps up to full injection line pressure (100 psi) at 16 psi boost. So, it varies, but the amount of injection is still relatively small.
Since you are running rich anyhow, it may be best to first focus on reducing your EGT, for safety purposes if nothing else. That can be best done by increasing ignition advance until some knock counts show up, and then backing off a bit. At that point, you may be able to start leaning out the fuel map for more power as long as everything remains knock free. My A/F near WOT is somewhere in the range of 11.8 to 12.5, so I think there is still room to pull some more fuel out. Scary stuff when the boost is bumping the UTEC default cut of 20.5psi.