Scot-e-dog

There appears to be two things going on: 1) backlash as a result of traditional lego gearbox issues accounts for 1-1.5 turns of the wheels (depending on what gear you are in), but..... 2) once this backlash has been used up, there is additional backlash in some gears where the clutch gear is clearly absorbing the resistance from additional friction. In this instance, there is also a stored "spring load" which flicks the wheels backwards. The gearbox backlash doesn't bother me. The potential for excessive friction does.

Has anyone come up with a solution for the "lag" when in forward gears? I have investigated this and come up with the following. - Before the marriage process, both engine and gearbox are running freely, with minimal friction. - After marriage, there is no lag in reverse, but lag in all forward gears, but more on some than others. - My conclusion is that the marriage process is somehow increasing the friction in the forward gearchain, probably as a result of a shaft being pushed hard into a stationary element. Unless anyone has any better ideas, I am going to retry the marriage process and see if I can play around with each of the shafts that get joined to decrease friction. I will let you know if I succeed.

It is backwards as it was on the Porsche. The fix for the Porsche was easy (unhook the arms that turn rotational action into linear action, rotate the arms 90 degrees amd reattach - this effectively reverses the direction). For the Chiron gearbox, it"s much more complex and my 2nd mod after the doors. It is odd though that Lego have got it wrong on both models.