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Hello :D

At my last trackday in Monza I had problem with high differential temperature. (302 °F redline!!)1f480.png
Outside temperature on this trackday 86 °F.

This week we changed the differential fluid and yesterday did a little test on the German Autobahn.
-Outside temperature: 66 °F
-Speed driven: 75 - 124 mph
-Test duration: about 20min.

The differential temperature rose continuously! Even if I drove slower, the differential temperature hardly got lower.
At 217 °F I stopped the test. ForScan always showed "Diff Pump Off" during the whole test.1f644.png
d04_n.jpg
The outside temperature was very cool compared to the track day and the speed was not really fast, but the differential temperature kept going up.
I don't think it should be like that.1f635.png

I can turn the pump on/off stationary (see video) https://youtu.be/dTqF9-XzbI4
But I don't think it works properly when I drive.

-At what temperature does the differential pump turn on? (Shelby GT350)
-Is there anything I can check? Or is it possible that the pump is defective?
-Relay? Fuse?

Thanks for help1f60a.png
 

Bill Pemberton

0ld Ford Automotive Racing Terror
6,998
6,125
Exp. Type
Time Attack
Exp. Level
20+ Years
Blair, Nebraska
Hopefully someone will answer this soon, but I will try and catch my favorite mechanic at the Ford Dealership I used to work at to see if he can help. I am only concerned he may be on vacation as I could not contact him last week, but I will try .
 

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