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axl911 axl911 is offline
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Join Date: Sep 2002
Location: texas
Posts: 863
Originally Posted by jwasbury View Post
Those temps are high, but not unexpected if the ambient temp is hot. I've seen my CHT in the same range when ambients are 90-100. And that was with me driving rather gently on the highway.

Another data point, on track (where I was into boost WAY more than you'll ever be on the street) most of the CHT data I logged was clustered around 340, with a peak of 377. It was a sunny day with ambient temps in the low to mid 60s. On a 90+ degree day, I have no doubt that I'd be seeing well over 400 CHTs, and that's why I'm not tracking the car in the summer (will do spring and fall events only).

I do plan to monkey with ignition timing just a little, but my ultimate plan to reduce CHT is to add water meth injection.
I would expect WOT to produce a lower CHT (at least on my motronic car) since WOT AFR is 12, ie. very rich mixture which cools the cylinder.

Part throttle and cruise where AFR is 14.7 is where heat can build up.

I am looking at this as a possible alternative to AW injection for part throttle. Just hate having to constantly fill the bottle.
Old 08-19-2011, 01:54 PM
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