hpi sprint 2 flux
 

it has geared diffs, can they be tuned with different silicone fluids?


any other observations on how they do as a club touring car on carpet or any othe tcs for similar budget?

cheers

The diffs aren't sealed so you can't use oil (EDIT HPI say they are sealed but someone at the track told me they weren't - perhaps the design is not suited to oils?). You can maybe try a thick grease in the front diff, or even blu-tack to lock it up (although if you lock it up you might start breaking other bits of the drivetrain).

I've seen a few running at my local club and they run fine with the right tyres. The Flux is the wrong motor/esc though, way too fast for indoors and not built to BRCA specs.