more Boost - now high EGT

[Marc Swanson]

> So far in my quest to answer why exhaust gas temps rise while cruising at
> highway speeds on a turbo car I have found that it is due to the leaning of
> the fuel air mixture.

which is what I think is happening right now.. Just need to program that
out on my car.  I thought I had everything set too rich but I guess
not!  Best to go to far rich then back it off so its just right.  I'll
have to play with it more tonight...

> However, I am still at a loss as to why this results in higher temps except
> that maybe the lack of unburned fuel in the exhaust gas that may dampen the
> temperatures. (i.e. all the fuel is burned in the lean, more efficient state
> vs when you are trying to get the car to speed)
>
> Any turbo wizes out there have any insight?


The turbo cars use piston oil squirters.  As you know a lean mixture can
result in detonation which creates just about the hottest combustion
chamber temps you can get.  These high temps are going to be directly
transferred to the oil very rapidly as the pistons will conduct the heat
pretty well (it is supposed to!).


That's my understanding of it anyway..


Later

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Marc Swanson, Software Engineer
Sonitrol Communications Corp.
Hartford, CT

Email: mswanson at sonitrol.net
Phone: (860) 616-7036
Pager: (860) 948-6713
 Cell: (603) 512-1267
  Fax: (860) 616-7589
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