Finally, good news!
Last week I picked up my Defender, and the power has been fully restored.
I was told there were two issues which were fixed , but they can't really tell which it was.
1. The supercharger that was originally replaced, was defective from Land Rover. Apparently, these new parts are having some issues. It did eventually throw a fault code but long after it was malfunctioning.
2. A multi-pin connector of the coolant pump had a bent pin that was not making proper contact.

Since they did both at the same time, they could tell if it was one or the other for sure. But they are pretty sure it was the supercharger.

Either way, I'm glad it was sorted out. It is a blast to drive the Defender again (just did 350 miles on it this weekend).

Onward to upgrading the tires... but that is a different thread

Thank you for everyone who participated and helped.

 

There, fixed your type O for you....

 

Talk about acceleration...

 

Hellcat performance is pretty bad for 200 more HP

 

I think they should have changed drivers to normalize things. I don't think it would have changed things much, the Durango would still win. However, it looks like the Durango driver was sport shifting/using the manual override while the Defender was just stomping on the gas. Does the V8 even have a "Sport" mode?

 

Yes - Sport mode and Dynamic mode for the V8. There is no launch control.

 

so my 2020 defender same sluggish problem
if it happens I pull over turn car off then back on again and boom problem solved.
the dealer replaced fuel injector but the problem still happens.
mom gonna ask about the super charger when I make an appointment.