Hello ![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
At my last trackday in Monza I had problem with high differential temperature. (302 °F redline!!)
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.
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.
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 help![1f60a.png 1f60a.png](https://trackmustangsonline.com/data/attachments/78/78841-6622d8a3905bae1d7a10f7cd57a1baf5.jpg)
At my last trackday in Monza I had problem with high differential temperature. (302 °F redline!!)
![1f480.png 1f480.png](https://trackmustangsonline.com/data/attachments/78/78838-51b23a87dbfb1b226d4797047875954a.jpg)
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 1f644.png](https://trackmustangsonline.com/data/attachments/78/78839-2348577c7069b3723a27ecc4520166ae.jpg)
![d04_n.jpg d04_n.jpg](https://trackmustangsonline.com/data/attachments/78/78837-5fbe5ac8a91d2c70ce16acbc4ddcc678.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 1f635.png](https://trackmustangsonline.com/data/attachments/78/78840-9738f75797ed484b8d6a8dc83f0b5733.jpg)
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 help
![1f60a.png 1f60a.png](https://trackmustangsonline.com/data/attachments/78/78841-6622d8a3905bae1d7a10f7cd57a1baf5.jpg)