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This is a place to share knowledge related to 1/12th scale racing. It is not to be used for conversations.

1/12th Scale Pan Car Kits:

Click links to go to manufacturer product page. If any are missing please add them!

Associated 12R6
https://www.teamassociated.com/cars_.../Factory_Team/ Jul 2017 release
DISCUSSION THREAD - Team Associated 12R6

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Old 02-03-2005, 01:53 AM
  #10741  
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Originally posted by EngTat
advice needed to buy 1/12 scale pan car. two cars same in my mind and very confuse. i have two cars to choose which is KAWADA M300RSW and a YOKOMO YRX-12 Worlds.
1st. the M300RSW is more expensive by 50USD
the kawada is equip with anodize silver parts while the yoks is Blue.
2nd. is it yok YRX is based on Rc12L3??? bcoz in asia the boz writen with Yokomo RC12L3 Worlds and does it come with lexan clear body???

can i know wats the pros and cons for both the cars before i decide to buy 1.thanks.
any advice will help to prior buying 1 1/12cars.
The Yoke is made with SSG and it's known that it has more flex then "normal" CF like the Kawa has.
And yes, the Yoke comes with A body (MS-1, used by masami on the 2002 worlds)
I thought both cars are pretty much based on the RC12L3 (correct me if i'm wrong), so not much difference there.

I guess spare parts for the Yoke are easier to get, since Kawa isn't that populair.
But hey... A 1:12 hasn't got that many parts and most are universal, so that's not the biggest issue.
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Old 02-03-2005, 02:09 AM
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Almost all 1/12th cars are based on or rely heavily on AE 12L3/L4 parts. the only car I can think of that is "AE Free" is the Corally ( are there others? I'm curious to know). There are so many aftermarket variations of the original AE Parts it's easy to forget who did it first.
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Old 02-03-2005, 02:23 AM
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the kawada chassis looks like it would have a lot of flex. not good if you plan on running carpet.

got another question about t-bars. i've been told that running two spacers allows the car to rotate better, or in other words, less rear traction while three spacers will give you more rear traction. True or not true?

Last edited by Hyperform Racing; 02-03-2005 at 02:44 AM.
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Old 02-03-2005, 05:12 AM
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Originally posted by DPowell
Rollout is the distance the car travels per motor revolution. You can find your rollout by using this simple formula:
rollout=(tire dia. x Pi x pinion)/spur

Here is an example, (1.85 x 3.1416 x 32)/100=1.86. Using a 1.85" rear tire with a 32 pinion and a 100 spur gives me a 1.86 rollout.

D.P.
DP- I see your method of rollout is alittle different then the one i heard.

(Tire Diameter x 3.14) / (Spur/Pinion) = rollout (and i heard rollout should be btw 30-40?

The way i do a metric way or something??

Jon
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Old 02-03-2005, 06:25 AM
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Thats the same equation written very slightly differently, do it both ways and see......
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Old 02-03-2005, 06:27 AM
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Originally posted by JDXray
DP- I see your method of rollout is alittle different then the one i heard.

(Tire Diameter x 3.14) / (Spur/Pinion) = rollout (and i heard rollout should be btw 30-40?

The way i do a metric way or something??

Jon
Jon,
The formula you use is slightly different but the result is the same. If you begin the equation using a metric tire diameter, your rollout will be in mm and vice versa.

D.P.
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Old 02-03-2005, 07:07 AM
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Originally posted by DPowell
Jon,
The formula you use is slightly different but the result is the same. If you begin the equation using a metric tire diameter, your rollout will be in mm and vice versa.

D.P.
Thanks DP for clearing that up. I do use mm for tire size some thats probably why our equations are alittle different.

Jon
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Old 02-03-2005, 07:22 AM
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Jon, my current gearing seems to work for me..... There's only 1 place on Willis's track we even have to slow for with the 1/12th's....

I'm using a Carpet Knife, no changing T bars for me....

I also do all my rollout calculations in MM, I find it easier to have a whole number than a fraction....
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Old 02-03-2005, 07:33 AM
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Originally posted by vtl1180ny
Jon, my current gearing seems to work for me..... There's only 1 place on Willis's track we even have to slow for with the 1/12th's....

I'm using a Carpet Knife, no changing T bars for me....

I also do all my rollout calculations in MM, I find it easier to have a whole number than a fraction....
By all means Allan if you feel fine about your rollout, use it. I was just giving an opinion on what i was told.

I do not use T-Bar either, i have the Hammer Conversion. And i do too use the MM calculation.

See you at the trophy race If your going.

Jon
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Old 02-03-2005, 09:21 AM
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Originally posted by JDXray
DP- I see your method of rollout is alittle different then the one i heard.

(Tire Diameter x 3.14) / (Spur/Pinion) = rollout (and i heard rollout should be btw 30-40?

The way i do a metric way or something??

Jon
If you do some algebra, you'll find that you multiply both the numerator and denominator of the overall fraction by the pinion (to get rid of the compound fraction) which leaves you with TD * PI * pin / spur = rollout

Of course, you could also see it as length of tire tread (TD * PI) divided by gear ration (spur/pinion)

whichever! They're the same.

I just picked up a 12L4 and am assembling it now. Looking forward to a day at SoCal!
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Old 02-03-2005, 09:31 AM
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Originally posted by JDXray
DP- I see your method of rollout is alittle different then the one i heard.

(Tire Diameter x 3.14) / (Spur/Pinion) = rollout (and i heard rollout should be btw 30-40?

The way i do a metric way or something??

Jon
Jon it depend on the type of motor your using too for the 30-40 rollout, with a mod motor your rollout would be different so don't base the 30-40 rollout on all motor's.

Rasta
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Old 02-03-2005, 09:39 AM
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Default Rollout

Hey guys!

I understand the use of rollout, but do you base your initial numbers on the wind of motor your using?

I'm just going to use an example of me running a 9x2 motor and let's say I want my rollout to be 36 to 38. Why do we use that 36 to 38 number and would it be different if we were to use a 8 x 2 or 10 x 3 motors?

Sorry, if the question is confusing but i'm confused myself
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Old 02-03-2005, 10:23 AM
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Default roll out

Yes, it's based on your knowledge of your motors, run time and size of track.
On our track 110'x36' indoor carpet I try to stay around:
Mod 10 turn - 1.38 - 1.4" or 35mm rollout
Stock (Monster) 1.57 - 1.59" or 40 mm
Stock (MVP) 1.65 - 1.67" or 42 mm (Yes, I still like the MVP, especially on real tight tracks. The ones I have are really torquey)

I have charts made out in excel in anyone wants a copy just email. I print them with a few different spur gear sizes and tape them to top of my box then it's quick at the track if I change tire sizes or winds of motors

take care
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Old 02-03-2005, 11:20 AM
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John,

Thanks, well this past weekend I ran a 10 x 2. Our track is 135 to 150 in by 50 to 65 feet. I ran a 21 and 22 pinion and a 100 t spur and I had to baby the throttle almost all race to make run time. I could be fast but then I would dump. Since I'm running a 10 x 2 I have to push it a little harder than the guys running 9x 2's......So understanding rollout may help me....

So I may have to get some info from you. Thanks.
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Old 02-03-2005, 12:19 PM
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send me your email address

I know the feeling. There's a lot of factors, battery juice is always on top, speed control settings, motor condition, etc. You have to know each and be able to adjust it to get the most out of your car. It's tough for anyone to say "do this" when everything effects run time. If you have the best batteries, supper smooth on the throttle, and your motors is very effecient then you can probably run a higher ration than the next guy.
For me, my son also races, he can always get away with one tooth higher than me. He's just easier on the throttle, everything else is the same. He tells me I'm just old and not as smooth
It comes with tons of track time and keeping track of all your setup so you know what to change when something happens.

take care
john
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