Quote:
Originally Posted by EcoCivic
I know that engines run most efficiently when they are fully warmed up. So my question is can running hotter than stock improve efficiency? I don't think that you would gain much from running hotter, but not sure. So, for example, if the stock coolant temp is 190, would running at 210 improve efficiency? If so, how much? Thanks.
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Yes and no. They are designed to regulate their temperature so going too hot will cause the cooling fans to come on and lower your efficiency. Example: my car runs at 200f, if it rises to around 208 the fans will come on.
Also, if the fuel you are using starts to pre-ignite (pinging) your ecu will pull timing to reduce peak pressures thus reducing efficiency.
Yes, higher operating temps increase efficiency but you're unlikely to see gains because the vehicles today are already tuned well and operate warmer than with past generations.