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I went to the EV club's build day this weekend and ended up bringing up this project with a friend there. I told him about the two limits that I might run into and that I thought it would probably be the dilution problem more than the pinging. He suggested something I hadn't thought of. Ethanol apparently is more combustible and able to be run leaner than gasoline. So, he suggested that if I run into this limit that I try increasing the ethanol content of the fuel to run a richer EGR mix. So, I now have an option should I find that I can dilute the mixture too much for gasoline (E10 in my area).
I am going to have to do more research on ethanol though. I really don't know much about it.
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