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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 09-23-2002, 11:21 PM   #1516
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TRL- Try Quasars and if you can use a serrator on them with some of the sides shaved off or about 1/4 of the brush cut off of the top. If you run the P94 then i would think about the dual shunt brush over the single shunt. Spring wise standard seems to be "greens" which i think are 9oz. The Orion springs look killer although i haven't tried them yet. i'm not much of a motor guru so you really want to ask around.
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Old 09-24-2002, 02:34 PM   #1517
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Thanks Stevie, I'll see if my LHS can order some gold rears and silver fronts for me. Will these tires be good without additive? Because we're not allowed to use it (confined space) but we can use tire warmers, but only if you can fin ones that fit. Does anyone know where I can get the strip type tire warmers, not the Eagle or Speedmind ones?
I'll see if I can actually drive the car at Thursday evening's race, if I do really badly then I'll blame the servo, or the tires or both
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Old 09-24-2002, 07:58 PM   #1518
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Question --

I have a 12LW -- if i want more rear traction, should i run more or less dampening on the rear pod ??? (i.e. thicker or thinner lube under the disks ?)

Same for the shock oil -- thinner or thicker for more rear bite ? What's a good weight to run as a starting point ?

Thanks!
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Old 09-25-2002, 04:33 AM   #1519
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LouisB: Trinity makes wrap type as does Integy. Here is the link to Integy page.
tire warmers

Looks like that may not work. Home page
Integy USA
Go to drop down bar: choose a catagory
Tires, Inserts & wheels
goto page 2
goto bottom of the page, last item #1620
Tire warmer 3
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Old 09-25-2002, 05:49 AM   #1520
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Goodwrench - I assume you have the little Delta shock with your 12LW. Associated recommends using 30 wt oil in it. The kit came with a little bottle of 30 wt oil. It looked like motor oil. There is also two springs that fit the shock supplied by Associated. Use the lightest one. Wolfe has a complete line of springs that fit this shock. You probably will not need all of them, just the lightest. The lightest Wolfe spring will be a little stiffer than the Associated spring. Those two springs should be all you need to adjust to different carpet conditions.
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Old 09-25-2002, 08:58 AM   #1521
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Thanks RC Nitro, I will try and get soem Integy ones, I think that Trinity has stopped making theirs.
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Old 09-25-2002, 12:22 PM   #1522
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i have a brand new/built - never ran SB12 Spashett Edition 2002 - available -

pm if your interested.
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Old 09-25-2002, 04:16 PM   #1523
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LouisB,
My local club does'nt allow addertives,i went once,but never again!!with the cars being so powerfull it was impossible to control,these cars really need addertives to drive them at there best,with addertives it's like driving on a train track.i now after drive 50 miles to go to a track that allows addertives,but its worth it-has they drive totally diffrent with addertives,but then again if you have never used it/then you might not miss it,just go easy on the throttle,
ive never had the pleasure of using tyre warmers,so i don't know what diffrence they make.?.
!good luck!
stevie
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Old 09-25-2002, 10:01 PM   #1524
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Before you guys all start buying tire warmers a word of warning: A former 1/12 world champ who will not be named here tried trinity tire warmers on his 1/10 pan car with foams. When he pulled the warmers off, he had 3 grooves burnt into his tires, just before his race. Not good.
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Old 09-26-2002, 09:41 AM   #1525
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I tried my Eagle tire warmers on my 12th and they fit alright
Acording to some people I race with, even without additive, the cars can grip roll towards the end of the meeting, it's just getting good grip up to there that's the problem. It must be some high grip type of carpet because Pinks are meant to work well most of the time.

Stevie: I find with my XXX-S and Pro-10 that tire warmers help loads (but I have to take the wheels off my Pro-10 to get the Eagle warmers on, 2 on each rear tire )

robk: That could be one of the reasons why Trinity stopped making their tire warmers. They were 12V, not 7.2V as most new ones are and my LHS said that they had a tendency to catch on fire

Gotta go and charge my batts, I'll give you all a race report afterwards
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Old 09-26-2002, 10:11 AM   #1526
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Hi Guys,

We started a pre-order section on our website for the up coming Yokomo YRX-12 Worlds Edition. This is going to be a limited production car with maybe about only 100-150 kits arriving for United States.

Steve Wang
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www.speedtechrc.com
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Old 09-26-2002, 01:07 PM   #1527
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Guys
What rules do you run under where you race. Track owner just asked. The ARCOR guys want to run 1/12 also, but 4 cell not 6 cell. We need to find some guidelines to go by. This will be virgin setup for all of us.

Thanks
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Old 09-26-2002, 01:55 PM   #1528
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Most of the tracks around us are 4 cell. This is on carpet. Looking at what is available car wise there are only a few that have 6 cell chassis.
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Old 09-26-2002, 03:28 PM   #1529
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Quote:
Originally posted by RC Nitro
Guys
What rules do you run under where you race. Track owner just asked. The ARCOR guys want to run 1/12 also, but 4 cell not 6 cell. We need to find some guidelines to go by. This will be virgin setup for all of us.

Thanks
4-cell is pretty much the national standard for the class now.
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Old 09-26-2002, 03:31 PM   #1530
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Quote:
Originally posted by SpeedTech
Hi Guys,

We started a pre-order section on our website for the up coming Yokomo YRX-12 Worlds Edition. This is going to be a limited production car with maybe about only 100-150 kits arriving for United States.

Steve Wang
Speed Tech R/C
www.speedtechrc.com
Hey Steve,

What about parts availability? I know that many of the parts are from the 12L3 but what about the ones that are not? Also, does the car take the standardized 1/12th tires/rims?
Thanks
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