CS TCU -- Change in F1 Prime when opening driver door
I recently installed the CS TCU and have been very pleased with the results. Transforms the way the car shifts. There are lots of posts of what the differences are and I am not going into the details here ... I bought the TCU out of Europe and was about half what the price here in US is.
Anyway, there is difference in the F1 pump priming cycle when opening the driver door.
As most of us are aware, if you open the driver door after say leaving the car overnight, the F1 pump begins a priming cycle. On my car that would take about 10 to 12 seconds. (I have read that owners have said it could be 8 seconds to 15 seconds ... just depends). After installing the CS TCU, when I open the driver door, the time the pump primes is only about 4 to 5 seconds. Then after turning the ignition key on, I notice the F1 warning light is illuminated. Also, the F1 pump starts priming again. This time, for maybe another 6 seconds or so until the system is pressurized, then the F1 light goes out. If I attempt to start the car when the F1 pump warning light is illuminated, the starter motor is isolated and it will not start. After the F1 light goes, out, then it will start.
The difference is that prior to the CS TCU, the pump would completely prime the system upon opening the driver door. After installing the CS TCU, opening the driver door only partially primes the system. The full pressure is not realized until after inserting the key and turning the ignition on.
This is not a big deal for me ... does not really bother me at all. Just curious .. especially you CS owners or others who have installed the CS TCU in their 360. Have others seen this?