ryanrlamothe
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Engine Management - 2006/04/05 18:29
This thread is in continuation of the technical portions of this thread.
Improper engine management is the #1 reason why aftermarket built and tuned engines become destroyed.
I have been meaning to ask, how do you tune your engines? At times, it sounds like you just slap on a factory ECU or an untuned stock map ECU and head out the door. Is that right? Do you have an AWD dyno nearby? How do you program your EcuTek/MoTec/etc. EM? A proper ECU tune can be the difference between good power and phenomenal power, between unreliable and unbreakable.
On further review, a reprogrammed ECU might be needed in your CR build in order for the engine to properly prevent detonation. The factory ECU will be unaware of the change in CR, and there are some interesting changes with the new pistons as well including a change in quench area and dish design. I would think that the change in CR is going to change your fuel ignition point with a corresponding increase in your combustion temperature. A tighter quench area should work to increase thermal efficiency, cooling the combustion slightly, allowing slightly higher CR's, but will it be enough to allow 11.2:1 CR pistons with an ECU designed to run 10:1 CR or lower? If nothing else, I would assume a change in A/F ratio to a much richer mixture would be required, at the very least, to cool the cylinder walls and pistons in an effort to avoid predetonation. I would also watch the EGT's to make sure you are not running anything way too lean/hot.
These are just some of my thoughts on the conversation, do you have any other comments/corrections/etc.?
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