Quote:
Originally Posted by cewrx7r1
My engine is a FD 13B-REW with all the supporting mods for power and reliability. Initial safe tune without any WI was 11.1 AFR at 16 psi boost which has been run for a few years without mishap.
For safety I added 350 cc / minute water only injection back in late 2010. With this, AFRs richen up to about 10.9 and I lose a little power.
I want to now tune to gain that power back or increase power a little. What is a good way to do this? Should I reduce fuel enough to lean out the AFR back to where it was before adding water, go a little leaner?
IN THEORY: If I want to maximise power, would I:
(1) calulate and adjust fuel by: (11.1/12.2) * fuel which would give an AFR of 12.2.
(2) add enough water so that with the above fuel my new measured AFRS would be again 11.1?
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No short single post answer, you best read my full thread on the water injection site @ Aquamist. You will see the in's and out's of various strategies towards running water at that flow rate and AFR settings and its effects on power.
If you want one line answer, set the AFR to 11.7 to 11.8:1.