[Ade]

hi Ade
do you have the orange capacitor fitted at the pick up feet and at the motor terminals?? And is the braid plate a nice snug fit on the guide flag.??

Also try running it with the rear wheels in the air and blip the throttle across the entire range and see if it changes id then..

 

[Ade]

hi
as it runs in the air no problem then it has to be interference on track.

So even though other cars have run without it it may be worth trying to add the capacitor to the pick up feet or claim the chip is faulty and ask for a refund..

You can send the car to me if you wish Ade and i will have a look at it for you.