It's been over a week now. No over heating up hill in the heat, no over heating in traffic, the 210 trigger on the E-fan tripped when I left the car idleing at the bank, but immediately the temp went to 180.
At the race on Sunday, the car felt strong, but that could just be the day's feel. But I did notice when I hit the rev limiter the cut off and on sequence seemed much quicker. In the past the rev limiter when zipppp, bang...pause pause pause, then zipppp. Sunday it was more like zipppp, bang, zip, bang, zip bang. More like an import's rev limiter. Handy not to have such a harsh cut off.
The best part was the E-fan control I had. Turn it off for the race and on when I got in line. With the E-fan on the temp dropped MUCH quicker than the mechanical fan ever did. From 220 to 180 in about 1/3 the time before with the mechanical fan.
I know some of the 4.7 guys have already done this. Does any one have a dyno # comparison? I've yet to get a base line on my truck, probably wait until November.
This was a pretty simple mod, I'd recommend to any of the tinkerer's out there.
Jay W
505/287 Dakota
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>Alright, here's what I did. On my 4.7L I pulled out the mechanical
>clutch fan and wired my fog lamp switch as an additional trigger to the
>electrical fan. From what I understand the E-fan will come on when the
>AC compressor is on and if the temp gets over 220ish. But otherwise I
>can manually switch the fan on from inside.
>This should free up a little HP, lighten up the fron end and give me a
>toggle for the fan (handy for ideling inline to race). Most I've heard
>is the 4.7 doesn't overheat with out the mechanical fan. I'm going to
>go test it now by driving (crawling) over the Sepulveda pass in 93+ degs.
>Later things to do is make a 180ish deg trigger for the fan and change
>out the T'Stat to 180.
>Jay W
>505/287 Dakota
Jayson Woodruff
Orbiter Instrumentation
Boeing - Huntington Beach
(714)372-6827
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:57 EST