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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 09-04-2008, 06:34 AM   #29221
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As the 1/12 season is starting again, I'm searching for a new motor. People told me bonded motors are 'better' for 1/12, so would the Novak Light Series (like the 7,5L of 6,5L) be a good alternative? They are less agressive but sintered. I'm talking about driving on a med-grip carpet track.

Second question: I was advised to use front Lilac/Purple and rear Yellow/Grey for stock racing (10,5/19T), is this a good choice and what would be advisable for mod?
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Old 09-04-2008, 07:48 AM   #29222
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Quote:
Originally Posted by potloodslijper View Post
As the 1/12 season is starting again, I'm searching for a new motor. People told me bonded motors are 'better' for 1/12, so would the Novak Light Series (like the 7,5L of 6,5L) be a good alternative? They are less agressive but sintered. I'm talking about driving on a med-grip carpet track.
I'm not sure that anyone is making bonded rotors any more except for Novak's EX Sport line. A quote from their page "The EX's bonded rotor is not recommended for racing."

http://www.teamnovak.com/products/br...ors/index.html

Just about every other vendor has switched over to sintered rotors.
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Old 09-04-2008, 08:16 AM   #29223
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Then maybe the L-series is as close as you can get to a bonded racing motor. Anyone tried them yet?
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Old 09-04-2008, 09:21 AM   #29224
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We tried out bonded rotors last weekend. Motor was an LRP X11 5.5 - which seems to be the normal wind apart from the top guys who can last on a 4.5.

Bonded rotor was ok but nothing like as good as a sintered rotor.
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Old 09-04-2008, 11:58 AM   #29225
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Is a receiver pack really necessary for modified 12th scale racing? And if so, how many mAh's? Motor would be Orion Vortex 2008 7,5T.
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Old 09-05-2008, 01:51 PM   #29226
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Default Jaco tyres 1/12th

Carpets in the Uk tend to be meduim grip at the very best and Jaco yellows and Lilac/d/pink fronts are perfect choice.
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Old 09-05-2008, 01:54 PM   #29227
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Quote:
Originally Posted by tellan View Post
Carpets in the Uk tend to be meduim grip at the very best and Jaco yellows and Lilac/d/pink fronts are perfect choice.
Look on the Team CRC website on the front page. They are going to release a new 12th scale rear that will be a yellow with a grey band on the outside.

www.teamcrc.com
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Old 09-06-2008, 07:19 AM   #29228
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If that means the tyres have two compounds on the same wheel, they are not legal for BRCA, EFRA and IFMAR racing. Those tyres can't be used in UK Nationals.

The Rule was brought in to outlaw wraps, and so keep costs down. HTH
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Old 09-06-2008, 08:14 AM   #29229
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Just love when they come out with something new and give it a old name.

1/12th Yellow compound Med-soft shore, long-wear.

Some of us old timer see yellow compound we thing back in the day of Very Soft shore and Fast wear. It would be a one run tire with a ton of grip.
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Old 09-06-2008, 08:25 AM   #29230
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Quote:
Originally Posted by SlowerOne View Post
If that means the tyres have two compounds on the same wheel, they are not legal for BRCA, EFRA and IFMAR racing. Those tyres can't be used in UK Nationals.

The Rule was brought in to outlaw wraps, and so keep costs down. HTH
I think you thing of the JACO 1/12th 2stage where you had a harder non useable inner tire. Then on top you had the other compounds like pink.

The CRC and BSR tires have the form next to each other, plus the cost the same.

Most stop using the 2stage because they did not get the life out of the tires like they can now. We run are tires close to the rim and you can not do that with 2stage.

So they are two different type of tires.
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Old 09-06-2008, 10:10 AM   #29231
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I just need a little help. Whats the normal roll out for 17.5, 13.5 and 10.5 BL motor on a medium carpet track? Just so I have a starting point. And what are the current shore ratings on 12th tires. I listed the tires below. It's been a few years since I last raced and all my notes for tires on my local track is by shore ratings and my motor notes are for brushed motors.

Rears
White
Yellow
Gray
Pink
Magenta

Fronts
Magenta
Double Pink
Lilac
Purple
Black
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Old 09-06-2008, 10:16 AM   #29232
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I also forgot to ask. I heard that some batteries made in the last year were just garbage. Were they IB's? What batteries have good durability? Thanks.
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Old 09-06-2008, 10:25 AM   #29233
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I've primarily been running 17.5T 1/12th. I'd recommend starting at a 84mm rollout. The gearing will depending on motor model, esc model and track layout. I'll defer to someone else for 13.5T and 10.5T rollouts.

Tire compounds are different depending upon which manufacture you pick. BMI has a Jaco shore rating chart posted online: http://bmiracing.com/bmiv4/index.php...d=15&Itemid=30

On carpet I've been running Jaco yellow rears (w/ the rim/foam seam glued) and either Jaco Magenta (for club racing) or Lilac (for big events) fronts. On asphalt i've been running Jaco Magenta front and back. W/in the Parma camp, the most common rear tyre is Grey and people run Magenta or Purple up front.

As for batteries the EnerG 4600 have been GREAT! The new batch of cells have a white ring at the top of the battery. A lot of matches have great cells out there. I'd recommend looking at tqcells.com
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Old 09-06-2008, 10:52 AM   #29234
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Im a distributor of BSR in Poland, and we mostly use pink or white rears, and purple or black fronts.

Some drivers use xxpink fronts ( which are like crc magenta) but that’s combination for a high grip track and the use them with pink rears.

According to batteries , most drivers decided to use 4200IB batteries, and after that we changed for 4600 as they became evadible. But the firs packs were as some would say "rubbish". You were lucky if you could make two 4cell packs out of 12 cells. ( working cells not some super matched cells)
but that was just in order to get several extra seconds of run time.

Now when most cell have been improved i would rather recomend for 12 class 4600 IB. Or EnerG 4600 I have no opinion about them but can be worth of testing.


For a motor I would recommend 5,5 turns , or 4,5 because 5,5 might not be fast enough for some tracks. If you have a long “straight” you would get your ass kicked. Some drivers prefer to use low turn motors , even in order to save batteries, they claim the just don’t have to squeeze the throttle that much all the time.
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Old 09-06-2008, 11:06 AM   #29235
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Thanks for the 17.5 BL roll out it will put me in the ballpark to start. As for tires I just need the shore rating for the tires. I know purple has a 40 shore rating. What I really need to know is what color of rear foam is a 32 shore rating and a 35 rating. For fronts what has a 35 shore rating and a 37. Thanks.
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