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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 09-16-2012, 05:13 PM   #38296
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I wish I had the chance to release my new 1/12th before this all happened. It was so close. Now I am going to have to wait a bit.
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Old 09-17-2012, 12:24 AM   #38297
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For those of you who balance the pod and chassis separately, would you mind sharing your technique? I wanted to see the difference in weight placement between the way I usually do it (whole car, using holes at very nose and tail of entirely race ready car) versus balancing them separate, but without a hole at the back of the chassis and the front of the pod I couldn't picture a reliable method. Thanks!
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Old 09-17-2012, 10:40 AM   #38298
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Quote:
Originally Posted by andrewdoherty View Post
For those of you who balance the pod and chassis separately, would you mind sharing your technique? I wanted to see the difference in weight placement between the way I usually do it (whole car, using holes at very nose and tail of entirely race ready car) versus balancing them separate, but without a hole at the back of the chassis and the front of the pod I couldn't picture a reliable method. Thanks!
There is no real reason to try and balance the pod as its not floating or moving side to side; as long as you keep the rear tires the same size it will be level and will not induce a tweak. As for the main chassis use the center pivot hole as the balance point.
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Old 09-17-2012, 02:25 PM   #38299
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Just assemble the car, take off your dampener tubes or side shock, and read the weight on the front and back. I use four scales so i have one for each wheel, six bucks each at Harbor Freight, and if I'm within a few grams at rest I don't worry about it.
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Old 09-17-2012, 06:29 PM   #38300
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Quote:
Originally Posted by protc3 View Post
I wish I had the chance to release my new 1/12th before this all happened. It was so close. Now I am going to have to wait a bit.
No problem man...I was hoping that the batts meant you were caught up but that makes sense. Gotta do what ya can to pay the bills and take care of the family.
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Old 09-17-2012, 08:23 PM   #38301
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Anybody else have trouble accessing BMI's web store? I get a screen that says something is not enabled for the menu.
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Old 09-17-2012, 11:21 PM   #38302
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Originally Posted by LonnyJ1950 View Post
Anybody else have trouble accessing BMI's web store? I get a screen that says something is not enabled for the menu.
Same here.
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Old 09-17-2012, 11:34 PM   #38303
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Default hitec hs-7235mh

Anyone using hitec hs-7235mh as the steering servo for 1/12 cars, specifically Yokomo R12 ?

the size seems similar to JR3650
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Old 09-18-2012, 04:20 AM   #38304
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Sorry about the webstore. I contacted Go Daddy and apparently they had someone hack into there systems and they said the repair can take from a day to 1 month to fix. If anyone needs anything, please call. Sorry for the inconvenience.
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Old 09-18-2012, 10:48 PM   #38305
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This season will be my first running 1/12 and I have a few questions. Our track is fairly small with medium grip carpet and we will be running 13.5 blinky. I'm planning on using a Tekin RS and was wondering what are the pros and cons between using a booster vs. a receiver pack? What would be a good neutral handling body to get started with?
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Old 09-19-2012, 02:34 PM   #38306
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Newbie here . Our club runs 17.5 boost 1cell , can I use any 17.5 or do I need to have a special motor?
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Old 09-19-2012, 03:12 PM   #38307
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Originally Posted by Csaari77 View Post
This season will be my first running 1/12 and I have a few questions. Our track is fairly small with medium grip carpet and we will be running 13.5 blinky. I'm planning on using a Tekin RS and was wondering what are the pros and cons between using a booster vs. a receiver pack? What would be a good neutral handling body to get started with?
I prefer a receiver pack, but they are a pain, I haven't found one that will go a whole day without needing to be charged. That said, the TQ booster works great, just slightly lower voltage. The Protoform AMR is the body for !/12TH, but the new Black Art Mohawk is gaining a lot of converts. See what your competition is using.

Quote:
Originally Posted by hotrod306 View Post
Newbie here . Our club runs 17.5 boost 1cell , can I use any 17.5 or do I need to have a special motor?
You can use any 17.5, but go easy on the boost and check your motor temps frequently until you're sure 8 minutes won't fry the motor.
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Old 09-19-2012, 03:38 PM   #38308
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Originally Posted by LonnyJ1950 View Post
I prefer a receiver pack, but they are a pain, I haven't found one that will go a whole day without needing to be charged. That said, the TQ booster works great, just slightly lower voltage. The Protoform AMR is the body for !/12TH, but the new Black Art Mohawk is gaining a lot of converts. See what your competition is using.
Thanks for the advise. The track has never run 1/12 before so we are all at the same disadvantage. I'm trying to piece together everything I need, and slowly getting ready for the upcoming season.
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Old 09-19-2012, 03:55 PM   #38309
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I've run both bodies and like them both.

For the motor temps -- don't wait until you've run 8 minutes, of course (check it after a couple minutes of solid running...).
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Old 09-19-2012, 04:49 PM   #38310
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Quote:
Originally Posted by Csaari77 View Post
This season will be my first running 1/12 and I have a few questions. Our track is fairly small with medium grip carpet and we will be running 13.5 blinky. I'm planning on using a Tekin RS and was wondering what are the pros and cons between using a booster vs. a receiver pack? What would be a good neutral handling body to get started with?
I prefer the booster as I only have one charger and dont want to buy another to charge the rec pack. I've run the TQ booster as well as the cheap $10 booster form China that Stormer sells. Both have performed well, in fact just this yr I had to retire my first TQ unit which I bought 5yrs ago. As Lonnie said the AMR is a solid well rounded shell but if you feel like experimenting I'd suggest back to back runs with one of the CRC and a Speed8 HD shells. By running the three shells back to back you would get a good feel for the way each handles. Just an observation, if possible you might want to consider 17.5 vs 13.5, it might be easier to lay down better lap times on your small med grip track with the 17.5.
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