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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.

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

TIRES:
Pre-mounted tires readily available in the US:
Pre-mounted tires readily available in the Europe:
  • Hot Race ??

Gluing your own donuts:
https://www.youtube.com/watch?v=hm7z1rz-74s - Special thanks to Edward Pickering!
Truing tires:
https://www.youtube.com/watch?v=8wqHOLWq6Uc - Special thanks to Edward Pickering!

The following information came from HERE, with some editing and information added. Thanks Christian!

THIS MAY NEED UPDATING FOR THE NEW BLACK CRC CARPET

Brands:
BSR, CRC, Jaco:
Pro One is no longer selling to the public, but it and the brands above are all mounted by BSR and use the same foam. The nomenclature of the BSR vs Jaco/CRC is a little different in a few instances but is otherwise the same. The BSR foam consists of three families, and can be identifed as synthetics, naturals, and blends.

Synthetics - The old school, light weight, easy to true "dry feeling" tires. These include tires like CRC/Jaco Yellow (BSR White), Black, Gray, etc. These tires offer the highest wear rate and lowest grip. Many racers continue to use these nder high bite conditions.

Naturals - These tires are usually the best alternative for low bite and asphalt. They include Pink, Magenta, Double Pink, Lilac (BSR Team Purple), Purple, and other tires. These tires provide a ton of grip, but tend to get sticky in high bite conditions. This rubber does not wear as easily, and the cars will pick up gunk and fibers from the carpet under most high bite conditions. This is especially bad if the humidity is high.

Blends - These are the tires most people run today. They were initially called "JFT foam" by some, as it was believed that the tires were the same as the JFT tires. We can divide the blends further into two groups: high rubber and low rubber content. The high rubber would be the new rear Orange and Red from the BSR family, and the low rubber would be the Green and Blue varieties. When, asked about the difference, John Foister from BSR Tires said they came from the same "family" of foam, but they offered different grip. According to John, the Green/Blue has more bite than Orange/Red, but from track testing Oranges offer more bite than Green (being equivalent to in hardness) when the grip is high and absolutely no grip when it is lower. The Orange foam has a denser pore structure and the tire is not as prone to chunking. It is also important to note is that BSR Blue rears are not the same as the BSR Blue fronts!

JFT:
JFT stands for Japan Foam Tire. They started the new wave of foam tires we are all using now (Blue/Blu, Green/Greene, Dbl Blue, etc). These tires are a little different than the BSR tire family, but work in very similar conditions. They offers four varieties A (asphalt), C (carpet), S (???), and R (???). This does not mean that those types only work on that surface, but this is what they recommend.

JFT uses the same foam for fronts and rears if the color is the same.

A: Used on asphalt, considered close to the natural rubber variety and are named consistently with other natural tires.
C: Used on carpet, considered a blend.
S: Used on carpet?, tires are ???
R: Used on carpet?, tires are ???

For setup, the JFT foam seem to generate more bite than the BSR, therefore the car tends to be a little more aggressive.

Ulti:
Ulti is another Japanese brand that offers an array of compounds. They have their own way of rating tires, and are difficult to equate to other brands. They have 4 different varieties, each in varying degrees of hardness.

J: High rubber content tire, similar to Pink/ Magenta. Soft would be close to a pink. These offer the most bite and are great for asphalt/carpet front tire. (J hard being very popular)
X: "Balanced" blend, similar to JFT Blue/ Green. Soft is equivalent to Green, medium to Blue in hardness. Great for carpet!
Y: High synthetic blend with lower grip, and is not a very popular variety.
Z: A very expensive "special" foam that is supposed to be magic on asphalt. Only make it in soft shore.
European tires:
There are many great European foam tire brands that use their own types of foam, as well as traditional foams. SOmeone with more knowledge about them will need to fill this in!

Tire Diameter:
If you are racing on carpet, you have to evaluate how much grip your track has. If your track is low to medium grip, you can run bigger tires. If you are on higher bite you have to cut them smaller, there is simply no way around it. Bigger tires are needed for asphalt, especially in the rear. The larger tires provide much needed lateral bite.

Carpet (mm):
Low - Medium Bite
Front: 42.0 - 42.5
Rear: 42.5 - 43.00
Medium - High Bite
Front: 40.5 - 41.0
Rear: 41.5 - 42.0
Big Race
Front: 39.5 - 40.0
Rear: 40.5 - 41.0
Asphalt (mm):
Parking Lot
Front: 43.0 - 44.0
Rear: 44.0 - 45.0
Prepped High Bite
Front: 42.0 - 43.0
Rear: 43.0 - 44.0

Tire Saucing:
Most facilities have moved towards odorless traction additives such as SXT. Some of additives evaporate very quickly and some do not. This seems to be something that is also dependent on tire compound and ambient temperature. For example, saucing a Green compound seems like it never dries, especially when tjhe temperature is lower. We have found that wiping the tires off 15 minutes before we go run allows the sauce to cure, which makes the car come in much quicker with Green rears. Blue compounds on the other hand, do fine when wiped off right before hitting the track.

Saucing half front and full rear is a good initial starting point. If the front of the car is too agressive you can sauce les than half, or for a shorter amount of time.
Tire Fuzzing:
In conditions of increasing grip, foam tires will somewtimes get sticky and pick up fuzz and debris from the track. This is highly dependent on the rubber sedan tire that is being run at your local track and the compound/ type of foam you are running on you car. The softer the sedan tire and the harder/higher rubber content in your foam tire, trouble with fuzzing seems more likely to occur.

There are ways to get around fuzzing under most conditions, and usually involves the selection of the correct foam compound. The more fuzz you get, the softer/lower rubber content you want to run.

Examples:
Problem: Car fuzzes with Lilac/Team Purple fronts and car starts pushing.
Solution: Use a softer front tire and or different family of foam. Replace it with Blue or Double Blue front.

Problem: Car loses rear bite 6 minutes into the run. Blue rear tires look almost clean but have small carpet hairs.
Solution: Use Green rear tires. The softer compound wears instead of getting sticky, minimizing fuzz.

Tire Selection:
Starting out, pick 2 tire compounds for the front and rear. The following should have you covered 99% of the time.

Front - Green and Blue (BSR) or Green and Light Blue (JFT)
Rear - Blue and Double Blue (BSR) or Blue and Dark Blue (JFT)

You may wonder about other compounds out there and if they might be better, trust me, they probably won't be. Even if there are other tires that can be as fast, the synthetic family wears out really fast and the high natural rubber will probably fuzz on you over an 8 minute run. The blends family seems to be the most versatile foam type available today. They last awhile, and sticking to them will make your process of tire selection simpler.
Tire Charts:
BSR/CRC/Jaco



Contact



Corally



JFT (Japan Foam Tire)



Ulti



Enneti (Xceed)



ELECTRONICS:
ESC:
As of now, ROAR is staying 1S (3.7V nominal; 4.2V fully charged) for 1/12. There are many 1S ESC's with a built in BEC so nothing else is required to power the receiver and servo.

If you don't want to lock yourself into a 1S specific ESC, you do have other options! It is possible to use your 2S ESC without a booster or receiver pack, and the ESC simply supplies the lower voltage. If that does not appeal to you, you will need to use an Rx pack or booster. The Rx pack and booster will both supply the receiver with a higher voltage than the 1S pack.

If you decide to use an Rx pack, MAKE SURE TO REMOVE THE RED WIRE FROM THE ESC PLUG THAT GOES INTO THE RECEIVER!!!

If you choose to use a voltage booster, it works exactly how it sounds. Instead of plugging the ESC into the receiver, it plugs into the booster, and the booster plug goes to the ESC, supplying the higher voltage.

1S ESC:
If there are any missing please add them!!

If anyone would like a need for a chart comparing the ESC's specs PM fenton06 and I'll get one made and put in here!
Voltage Boosters:
If there are any missing please add them!
Servos:
BODIES:
Black Art (CRC - US Dist):
  • Audi R8C - BA002 - .020 Thick



  • Black Market (Mohawk 12) - BA005 - .020



  • Lola B10 - BA006 - .020 thick
  • Toyota TS030 - BA008 - .020 thick

    Lola - black/red, TS030 - green/pink


PROTOForm:

Reflex Racing/RSD:

SUSPENSION ADJUSTMENTS:

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Old 03-19-2007, 09:29 PM   #24271
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Mod is the only thing that wants to get run down here. But lately we have gotten some new guys that will run both stock and mod. The guys running stock are getting ready for a state race. Mod and stock run together here as an open class. Their are three new guys and two of them run mod along with some of the other guys, but majority has gone to stock cause it is less wear on tires and parts. Either way we all have fun.
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Old 03-19-2007, 09:48 PM   #24272
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How about a setup for running brushless 19t (4300) .....Do you run roll at neutral ?

We run only 19t here at our local carpet track. No stock or mod...Just 19t.
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Old 03-19-2007, 10:16 PM   #24273
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Quote:
Originally Posted by lbckevin
How about a setup for running brushless 19t (4300) .....Do you run roll at neutral ?

We run only 19t here at our local carpet track. No stock or mod...Just 19t.
Since the brushless motors have no cog there is no reason to set the car to roll. My Sphere Comp can be set to have the same natural drag as a brushed motor (supposedly) and I set it one click less than that. On my GTBs I leave them at the factory default setting. I think there is a lot more to learn about setting the brushless cars and speed controls up, we're just scratching the surface!
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Old 03-19-2007, 10:19 PM   #24274
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FWIW my team guys still prefer brushed 19t over 4300. Not because of any horsepower issues, the car is just better balanced overall and has a better power curve. But like I said, we still have a lot to learn about brushless
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Old 03-19-2007, 10:35 PM   #24275
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It definately is a challenge to balance the car with a brushless (Irun the LRP v2)....Took almost an hour and half to get it right.
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Old 03-19-2007, 10:38 PM   #24276
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Most of the guys that I have been racing against haven't run stock since the class that was offered was mod. We are all new to 1/12 so setting up and racing has been a good laugh. It's hard to race when your ribs are sore from all the laughing

Most of us are running 5.5 brushless with 4200 cells and balancing the car is and issue, but you guys have given ideas on lay out that seems to solve most of the issues.

They are a ball to drive and race ONCE you get the setup right
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Old 03-19-2007, 10:39 PM   #24277
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Quote:
Originally Posted by lbckevin
It definately is a challenge to balance the car with a brushless (Irun the LRP v2)....Took almost an hour and half to get it right.
ditto
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Old 03-19-2007, 11:05 PM   #24278
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When I said the brushed car was better balanced I meant that the combination of weight, horsepower and chassis was a better combination on the brushed car.

Balancing a brushless car, however, is a topic worth discussion. The issue is the extreme imbalance of the motor pod. Mark Payne came up with the idea that you should ignore the motor pod when balancing a BL car, and I agree. At first I rejected the idea, but after considering it and the alternative I think its the best way. The motor pod sits on the rear tires and if you pile a bunch of weight on the right side of the car to compensate for it the right front spring will be compressed, which to my mind makes the car tweaked. The only real solution is a re-designed motor pod which centers the weight of the brushless motor. We are working on that!
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Old 03-19-2007, 11:35 PM   #24279
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Quote:
Originally Posted by odpurple
When I said the brushed car was better balanced I meant that the combination of weight, horsepower and chassis was a better combination on the brushed car.

Balancing a brushless car, however, is a topic worth discussion. The issue is the extreme imbalance of the motor pod. Mark Payne came up with the idea that you should ignore the motor pod when balancing a BL car, and I agree. At first I rejected the idea, but after considering it and the alternative I think its the best way. The motor pod sits on the rear tires and if you pile a bunch of weight on the right side of the car to compensate for it the right front spring will be compressed, which to my mind makes the car tweaked. The only real solution is a re-designed motor pod which centers the weight of the brushless motor. We are working on that!
iv noticed watching cars the ones with a brushless motors drive assy like the rear of the car is to heavy.
but its something i want to try.
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Old 03-20-2007, 12:34 AM   #24280
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Quote:
Originally Posted by wallyedmonds
iv noticed watching cars the ones with a brushless motors drive assy like the rear of the car is to heavy.
but its something i want to try.
I think you are on to something there. I've noticed that our brushless cars beat up the left rear tires more than the brushed cars (on a clockwise track). I think it's because of the motor pod imbalance
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Old 03-20-2007, 12:48 AM   #24281
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I race with arr see car and we are having a lot of fun with the 1/12 cars and i'm thinking of selling my brand new moore-speed cyclone because it just doesn't do much for me anymore. I run a 5.5 BL system in my L4 and didn't even think about the balance of the pod.
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Old 03-20-2007, 12:51 AM   #24282
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OD,

You have some pics of your brushless cars....I love your wiring jobs...
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Old 03-20-2007, 01:08 AM   #24283
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i'm looking at getting another 1/12 in the next few weeks but i don't know which is one to get between the corally 12x or CRC gen X. I had a CRC 3.2R a few years ago and liked it so i know the gen X will be a nice car but the Corally also looks very nice.....
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Old 03-20-2007, 02:09 AM   #24284
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Would it be better to adjust the tweak and balance without the BL motor in???
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Old 03-20-2007, 02:16 AM   #24285
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Quote:
Originally Posted by odpurple
I think you are on to something there. I've noticed that our brushless cars beat up the left rear tires more than the brushed cars (on a clockwise track). I think it's because of the motor pod imbalance
Mine was doing the same but when I tightened the thrust bearing to a point that I could drive the car in a straight line on power, tyre wear became the same.....but,

the thrust bearing is that tight that you can hardly turn the spure.

I didn't even think about the pod imbalance eather GUNNA, but you can see it when you hold the car.
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