2 Speed Gearbox for any Car!

[Nick Goodall]

Haven't ever seen one of these myself..... can't really see how it works?

http://cgi.ebay.com/TWO-SPEED-TRANSM...QQcmdZViewItem

[Stu]

It's just a centrifugal clutch & one way roller bearing, neat.
Is this similar to the mechanism that was on the PB Mini-mustang?

[Stu]

Advert claims this "It provides racers with more steering control over sharp corner(s)"

[Nick Goodall]

It sort of makes sense..... if it has two gears i assume the first is very low ratio which should mean you get a really responsive car in the "lower" gear so should be easy to get on and off the power.

Sounds like quite a good idea anyway - and not exactly expensive either!

[Chrislong]

Have I read that right, the gearbox is 1 & 8:1

So that means, 1 rev of the motor, = 1 rev of the pinion,
then in 2nd gear, 1 rev of the motor = 8 rev of the pinion?

Wow, that will mean will have to drop pinion size, the the 1:1 is ultra low, as the high is ultra high.

It quotes "higher torgue, acceleration, top speed" but really, torque will be improved on the 1:1 but 8x less on the 8:1, therefore acceleration fast til it engages to 2nd gear, and top speed will be improved over a very long distance, so long as not running in long grass or uphill, as it will just bog down.

It'd be like setting off in my real car in 1st, going to red line then going to 5th.

Mental. if it was 1 & 3:1, it may be worthwhile for offroad. (although illegal by BRCA)

[Nick Goodall]

Chris, i guess it wouldn't be as bad in a real car if you had the equivalent of say 1000bhp though like our 1/10th buggies as they would still accelerate pretty quickly even at the higher ratio wouldn't they?

I guess it would be good on certain tracks - would be cool to see it working anyway

[Stu]

Originally Posted by Chrislong

(although illegal by BRCA)

I don't think it would be illegal, there is no rule making it illegal, so therfore it must be legal?

Anyone......

[LiamD]

No 2-speed gearboxes for electric cars as far as I know. (in relation to BRCA rules)

[Stu]

Is there a rule?
Which section?

[albertobdq]

2 speed transmision are banned for electric cars. The reason why... maybe too much speed, I don't know

Many years ago you can buy 2 speed transmisions, very similar to the ones used nowdays on gas touring cars. HPI, Yokomo and schumacher produced themm in fact schumacher went one step further with 3 speed.

Around a decade ago we clocked a HPI RS4 with 2 speed tranny at 80 km/h with six 1700 mAh SCR cells

[Oscar]

Originally Posted by Chrislong

Have I read that right, the gearbox is 1 & 8:1

Read again Chris, 1:1 and 1.6:1

[Chrislong]

Originally Posted by Oscar

Read again Chris, 1:1 and 1.6:1

Hey John,
The seller really has screwed up the page. the title definatlely states 1 & 8:1, but in the text it specifies:

Low speed = 1.6:1
High speed = 1:1

Anyway, this seems a bit more like it, I suppose it means to use it, you would be able to gear up so the 1:1 is higher than the overall ratio which is usually run, as the 1.6:1 will easily take care of the standing starts/low speed corner exit.

I still don't want one tho.

[Nick Goodall]

Originally Posted by Chrislong

Hey John,
The seller really has screwed up the page. the title definatlely states 1 & 8:1, but in the text it specifies:

Low speed = 1.6:1
High speed = 1:1

Anyway, this seems a bit more like it, I suppose it means to use it, you would be able to gear up so the 1:1 is higher than the overall ratio which is usually run, as the 1.6:1 will easily take care of the standing starts/low speed corner exit.

I still don't want one tho.

Nothing to do with the amazing amount of room you've got in both X Cars??