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a related issue
Posted by Dean (more from Dean) on Fri, 9 Mar 2001 09:59:58
In Reply to: Re: phase change, Brad, Thu, 8 Mar 2001 19:08:14
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I have long suspected that the ECU's fuel and ignition mapping gets to a point with the intake air temperature where the system reduces power not because knocking is detected, but to be conservative (chicken)at high temperatures.
Perhaps with the mild summers in Sweden, they are not comfortable with high temperatures and give up on power when things are hot.
I did find that insulating the intake system helps lots in hot weather, almost like getting under some temperature threashold. But complicating this impression of what is going on is my external boost controller. I am able to generate lots of power when it is 100F outside. So the engine and ECU will produce adequate power in these hot temperatures without any knocking problems. So that is one of the reasons that I think that the ECU maps less power when things are very hot. It is not that the engine cannot perform adequately in the heat.
So the lack of boost in hot weather could be the ECUs fault, and not be fully the effects of thermodynamic or combustion issues.
I know that when it is hot, that charge air density and turbo compresssor efficiencies both suffer. But there seems to be a temperature theashold wheret power takes a sudden hit.
Also, when is it hot, and there is a side wind, the engine compartment can run hotter, and power and gas mileage suffer. I feel that my highway mileage in hot weather with strong side winds is better with the insulated intake system.
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