View Full Version : Are these race legal?

08-08-2007, 08:53 AM
Saw these (http://cgi.ebay.co.uk/TWO-SPEED-TRANSMISSION-FOR-RC10-1-8-1_W0QQitemZ130141112851QQihZ003QQcategoryZ19168QQs sPageNameZWDVWQQrdZ1QQcmdZViewItem) on ebay, interesting. I doubt they are race legal and they would push the motor over quite a bit shifting weight and making it a bit vulnerable to damage.

I vaguely remember that there was a car in the 80's with this kind of thing as standard.

Richard Lowe
08-08-2007, 09:17 AM
I don't think they are legal, looking at the size of the gears a modern brushless system would probably rip the gears apart too :wtf:

08-08-2007, 10:07 AM
Yeah I don't think they would stand up to a powerful motor - but I've never heard of a rule against them myself and can't see anything wrong with it.

08-08-2007, 10:42 AM
I think there is a rule on changeable ratio's, if I remember rightly, need to dig out my BRCA handbook.

Although, for entertainment value id like to try one, and see how long it takes for me to melt it.

08-08-2007, 12:23 PM
the old mini mustang had an option for a 2 speed system


08-08-2007, 02:38 PM
the mini mustang and a couple of others had 2 speeds that after a while i think they banned the 2 speeds

Chequered Flag Racing
08-08-2007, 03:05 PM
I think there is a rule on changeable ratio's, if I remember rightly, need to dig out my BRCA handbook.

just searched BRCA 1/10th Off Road and can't find anything to say it can't be used

08-08-2007, 07:03 PM
A multiple speed transmission is illegal in TC's but there is no mention of it in the 1.10th off road section

These 'boxes can handle quite a lot of power, I know of one in a zx5 with a high power brushless which hit 70mph!

08-08-2007, 08:47 PM
2 speed transmissions are perfectly legal in off road, whether it gives an advantage in off road is another matter. The PB Mustangs ran with 2 speeds and they still got beat by the CAT.

They are banned in touring cars, highly likely because when they formulated the rules HPI had a 2 speed gearbox on the RS4 and it was likely that every manufacturer would need to make a gearbox for their cars.

09-08-2007, 02:26 AM
One of these could be fun for speed runs in my pro-ten, gear it way up higher and see what sorta speeds i can hit!