I have run the TRF419XR extensively since December until now, on two different track layouts on our permanent track. The track uses grey carpet and the grip will get to a medium level at most depending on use and conditions. The grip is never super high. Pictures of the track layouts you can find in prevous posts.

My overall impression of the TRF419XR has been the same from day one and throughout testing. I really, really like the car, and it has always been consistent and easy to drive. Obviously I have not tested everything, but I have systematically gone through a lot of stuff.

The setup I post below I feel is a very good base setup. A super consistent starting point where the car should always work well. With this setup I ended testing finally managing a sub 10 second laptime and a 30 lap 5 minute result. Something which had been my aim since changing to this track layout.

Some notes:

• Using a 1.3mm rear rollbar will make it even more easy to drive, but I was slightly slower with it.
• Harder rear springs works well and produces faster laptimes, but I feel the 2.6 rear spring is usually the best compromise.
• A harder rear diff is also faster, but with the diff setup I now run (will post about this later) 5K produced the best result on this track.
• Softening up the center flex (center stiffener/motor mount) will give more grip, but this stiff setup was most consistent running the standard carbon chassis. I have not used an alu chassis at all as I don’t have one specifically for the XR.
• I also mount the front and rear bulkheads differently, as this always gave the best feeling for me.
• The Bittydesign M410ULT has been my favourite body of all in these conditions.