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Old 10-20-2009, 10:29 AM
  #10546  
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Originally Posted by Granpa View Post
Take the front wheels off too. That sould cure the wandering problem
HAHA i was just thinking that!


Havent really read back, about this light thing but the way i see it while lighter can mean less traction, in the event that there is enuff traction wouldnt lighter possibly result in greater acceleration and less roll/momentum (resulting in a more nimble car)?
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Old 10-20-2009, 11:52 AM
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It seems the other factor not being taken into account is what type of track one is running on. My home track is carpet and very grippy. Depending on that tires you use, a light car will either work well or traction roll at every turn.

One of our consistently fastest drivers is a big advocate of adding weight. His car handles like a dream and is somewhere around 1500 gr. The basic theory is to make the car stick to the track no matter what. Seems to work well for him for his combination of tires and springs.

Others are running minimal weight and super sticky tires and finish well.

The most important thing we've discovered is that the car doesn't have nearly as much to do with winning as the driver does. All of this super-fine tuning is complete overkill, and frankly those carbon shafts don't do a damned thing for you. A few grams located a few mm above roll center really don't matter that much.

Jim
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Old 10-20-2009, 12:23 PM
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Originally Posted by edwintklee View Post
totally agree with your point, lighter less traction,

but maybe we are able to shift the CG to achieve more traction....

well just my 2 cents, after seeing the weight distribution on the Xevo, i suggest you to reconsider the term " lighter = Less traction"
ED

Yes but we cant redesign the M chassis and move the motor in front of the wheels WE are talking about the M chassis cars not the Xevo. The Xevo is comnpletely different
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Old 10-20-2009, 02:11 PM
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Infact if im not mistaken the reason for traction rolling is too much grip in the first place :P

My understanding of physics makes me think that traction rolling is a different matter altogether.

The way i see it traction rolling is the result of centrifugal forces effectively acting on the side of the car and effectively pivoting the car around its outside wheels.

Although ive never tried it, this would mean that if weight is reducing traction rolling then and your car only traction rolls through right hand corners, it would be more effective placing weight on the right side of the car (and down low) to generate a greater counter moment to that created by the centrifugal forces.

Dont know if that makes sense to anyone else out there or not.

Ive heard people say that minis arent exactly most balanced cars left to right in the first place **SHRUG**
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Old 10-20-2009, 02:47 PM
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Default M-Chassis race @ BCR Nov. 7

Calling all the TAMIYA M-Chassis guys from Aliso Viejo, and other locals to join the MJGTC Final Round @ Bending Corners Raceway (BCR), on November 7. Let's all bring our mini FWD and/or RWD cars and have our own race class.
http://www.rctech.net/forum/electric...es-v2i-61.html
Here is a video of the track for others that haven't seen it.
http://www.youtube.com/watch?v=D7SJ8lZlFhU

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Old 10-20-2009, 04:29 PM
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Originally Posted by mangoman View Post
The way i see it traction rolling is the result of centrifugal forces effectively acting on the side of the car and effectively pivoting the car around its outside wheels.
We've found the primary cause of traction roll is the outside edge of the front tires. Most racers at my club are using the trick where you run a tiny little bead of CA glue around the outermost portion of the tread surface on the front wheels. This pretty much eliminates the problem.

For those who would like a better description, the glue would be applied to the outside row of tread blocks on a Tamiya radial.

We do this and run into the corners at fast with the steering cranked hard. It does seem counter-intuitive, but it works.

Jim
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Old 10-20-2009, 06:25 PM
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hi, for big asphalt tracks, i found a lighter car (M03) was faster. for tight carpet tracks, seems the heavy m05 is a must, m03 simply traction rolls too much.

above is just my experience, others might have different results/experiences.

for now, the lighter m03 is in the closet, the heavier M05 is what i'll work on.

ty.

p.s. for tamiya rules racing, i think m03 with white springs front is still softer than m05 with soft reds in front. so maybe the m05 with its very stiff front suspension is less succeptible to traction rolling. thoughts?
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Old 10-20-2009, 06:42 PM
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A stiffer suspension set up makes the car more darty and less roll. Maybe less toe in the rear will stop it from hooking around causing traction roll because it transfers weight faster to the front. Also you can use the highest hole in the rear upright to stiffen up the rear. I never had a problem with traction roll. Maybe i'm not driving as hard as you guys, but then again, I am just running a silver can

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Old 10-20-2009, 07:22 PM
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Originally Posted by cannon View Post
ED

Yes but we cant redesign the M chassis and move the motor in front of the wheels WE are talking about the M chassis cars not the Xevo. The Xevo is comnpletely different
hehe how we wish that the next M series from tamiya can handle like the xevo..
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Old 10-20-2009, 08:42 PM
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Originally Posted by edwintklee View Post
hehe how we wish that the next M series from tamiya can handle like the xevo..
i m very sure that TAMIYA is watching & listening...
in so far as the Front WD is concerned, at least in Malaysia, there is no match for Xevo...full stop.
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Old 10-20-2009, 09:03 PM
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Originally Posted by madjack View Post
PaPeRo,

How about sharing some of your light weight setups, race results etc.???
still waiting...
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Old 10-21-2009, 04:14 AM
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Originally Posted by madjack View Post
still waiting...
any you are probably still going to wait..

he's been called out - time to put the money where his mouth is..
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Old 10-21-2009, 04:44 AM
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I'm still waiting too!


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Old 10-21-2009, 10:57 AM
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He's not saying anything, but is telling us everything
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Old 10-22-2009, 03:29 AM
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Originally Posted by MTX3-B View Post
i m very sure that TAMIYA is watching & listening...
in so far as the Front WD is concerned, at least in Malaysia, there is no match for Xevo...full stop.
i believe your M03 and M05 its crying .....cos you found your new love....
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