[Fragoso]

Hello everyone:
I´ve been seting up a Ninco BMW LMP to race at my local club Endurance series and as a first shot into tuning my cars. Untill now, I´ve allready swaped the original NC1 for a NC5, wich made my car faster in the slower parts of the track, since it now responds better at lower speeds. Everyone else in that championship is running slot.its 29k rpm, so I should be switching to one of those engines when they reach the store sometime next week. I was wondering wich ratio I should use for the crown and pinion with that setup. Anyone can help me here?
I was also told by a club member to mount the front axle at a higher position. I did just that but now the front weels (wich were replaced by small silicones) don't touch the track and the thing stays up like a tripod, hanging on the guide. The car races nice like that, but is not legal. I´ve swaped the braids for the thinner scx pro type, but I still have a 1-2mms gap beetween the track and the weells. I´ve sanded a bit of the guide but to no avail. What do you guys do in this situation?

Thanks in advance for the help:
Fragoso

 

[Mecoprop]

QUOTE mount the front axle at a higher position. I did just that
Er . . . why not just lower the axle - by just the right amount?

 

[jonny s]

Hi Fragoso

No need to do that matey. Just fit skinnie tyres to the front and remove silicons from the front. Definately do not want grip at the front for this car mate

 

[mtucker666]

If the rules say wheels much touch then as meco states just set the axle heightso they just do. If you are running on a super smooth surface e.g carrera or routed, then fix the axle at that height as it will provide a bit more stability in the corners. However if you run on 'bumpy' track e.g SCX, Ninco etc then you need some updward play in the front axle so it rides over the bumps without lifting the guide out.

In terms of tyres - again choose any (tyre choice will determine axle height fixing) - as Jonny S states you want minimal grip up front so either use e.g slot-it zero grip tyres, or if the rules allow varnish/nail polish them so they have a hard no grip surface.

I like Jonny S use Pink-Kar skinnies as it is a quick and easy soln to ensure the guide sits all the way in the slot.

Matt

 

[mtucker666]

gear ratios
play with them - first try 3:1 (standard) then try 2.6:1 (top speed) and 3.4:1 (better accelearation/braking) and then inb etween. See which ones give you best CONSISTENT lap times (with minimal deslotting) and go for that. Note the tyre diameter effects it all so a gear ratio for one car might not ge as good for a smaller wheeled car.
Matt

 

[Fragoso]

Thanks for your repply everyone.

This weekend i did just that: i lowered the axle again. I did it with the silicones size in mind, but now that you mention in, it sures makes sense to have no grip on the front tires. I believe that our rules allow for that varnish thing on the front tires, and it also allows the use of that thing you put on RC cars tires for traction (i dont know the name of it). So, i´ll be switching the front tires again, like you sugested.
I´ll also try those ratios you mention, once the slot.it axles stock arrive sometime this week. I´ll keep you guys posted.