[Top Down]

I have a second hand anglewinder NSR Mosler with a King 30 motor that goes like a bat out of hell but has no brakes at all! On a 30' straight I'm having to 'brake' 10' from the end to make the corner. The Parma resistor controller is wired for brakes as is the track, of course. The same controller works well on other NSR, Sideways, Slot.it and ScaleAuto cars so it must be the Mosler. 

Is there anything I can do to improve create some braking without changing the motor? Gearing? Larger dia. tyres?

P.S. Racing is mag-less.

[Kevan]

I don't use King 30s but I have a couple and go much quicker with Sharks. 
I'd start at 3:1 gearing then increase that to get more braking/acceleration.  Smaller pinion and/or bigger spur will give more braking/acceleration at the expense of top speed. 
Have you added ballast in the car?
...smaller dia tyres will also increase braking and the same effect as increasing gear ratio but you'll lose traction with lower profile rubber. 
What car is this in?

[Top Down]

NSR Mosler AW. Can't go smaller with the tyres or bigger with the spur so it'll have to be the pinion. Didn't want to do that really though.

Perhaps a driving course would be in order then 

[BAracer]

You say it's a 2nd hand car, so perhaps a new King might restore normality.

[Kevan]

NSR Mosler AW. Can't go smaller with the tyres or bigger with the spur so it'll have to be the pinion. Didn't want to do that really though.

Perhaps a driving course would be in order then 

Why can't you fit a bigger spur?

1 tooth on the pinion is approximately 3 on the spur (depending on ratio).

You'd get a much bigger improvement getting a SW pod for it, none of our club race and lap records are held by AW, we are also non mag on routed track.

[Anthony B]

Put fewer teeth pinion and match with an increase in teeth on the spur. I generally find brakes come in at around 5:1. PS this will also improve acceleration, although it does reduce top speed a little.

[Top Down]

Current tyres and spur gear are very close in diameter so it may be a case of bigger tyres to fit a bigger spur - but I'll see how tight it is. I think as Anthony B suggests, a combination of smaller pinion and bigger spur will get me there.

I don't think there's any worries about losing a bit of top speed, that's for sure!

Thanks for all the replies.

[Nonfractal]

I do use king 30s inline in several cars.
What I would say is that you might be thinking that the braking is poor because the cars don't stop as quickly as your slower cars.but decelerating from10 metres per second or more is a big challenge for all of the components of a car. 

Shorten your gearing (see my "gearing explained" thread. )
Get yourself a better controller to handle deceleration from high speeds (see My "braking" thread.)
Shed weight from the car 
Clean the motor.
Ensure your tyres are true.

AlanW

[Top Down]

Well I've gone from 10:30 to 10:36 but I've had to go up a tyre size to get the teeth off the track and there's no way to test it until I can get back to the club's big straights - next Spring! Maybe I'll check to see if I have a 9 or 8 tooth pinion in the meantime?

[chrisguyw]

Well I've gone from 10:30 to 10:36 but I've had to go up a tyre size to get the teeth off the track and there's no way to test it until I can get back to the club's big straights - next Spring! Maybe I'll check to see if I have a 9 or 8 tooth pinion in the meantime?

Going from a 3:1 ratio (10 x30) to a 3.6:1 ratio will certainly improve both acceleration and braking (at the expense of a bit of top end), but, having to use taller tyres does reduce the numeric ratio, depending on how much taller you had to go with the tyres, so you may well end up where you started,......additionally a taller tyre will raise the center of gravity, and this may well adversely affect handling/lap times

Reducing the tooth count on the pinion, is a much better idea all round.

You can also certainly play around with different dia. pinions and Spurs

Cheers
Chris Walker