Quote:
Originally Posted by CSG Mike
Sure is. This is the context of my reply, in case you missed it. The table, being of only 2 dimensions, is um... inconclusive.
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Agreed. I am technically at the beginning of the red, but I don’t think there is concern at all running 12 psi @12.5:1 on E85. It isn’t an issue on pump either with a progressive boost like a SC. There is more risk to the rods from torque than from preignition on my stock motor, so I was surprised the guy has a built motor, but is only running 10 psi on E85. That seems overly conservative. I think it is even too conservative on pump gas because of the built motor.
That chart might be old like before direct injection and high compression engines were more prevalent. It definitely doesn’t apply to built motors on race fuel.
I know lots of people do built motors with modest goals, or they do it for security or insurance, but I couldn’t resist more boost if I had a built motor. I would run progressive boost, boost by gear, dual boost maps and boost by ethanol level. Like couldn’t he run a lower boost map for 91 or when the flex fuel is closer to E10 and run a higher boost map when it is over E45 or something? Like I’ve seen plenty of setups that automatically switched to ones that had a toggle or button to people running manual boost switches. Is OFT tune the problem for him?