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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 11-08-2001, 08:55 AM   #271
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I would get a CK. I just went through the same thought process you did.

I am very happy with the way the CK went together. I haven't raced it yet (but I will this Sun)
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Old 11-08-2001, 09:20 AM   #272
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i believe i post a question...where the answer?
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Old 11-08-2001, 10:26 AM   #273
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Quote:
Originally posted by Disaster999
anyone know who to clean the flang bearings on the axis?
what should i do?
What type of bearings is it. if it just a metal shield one you can use a bearing blaster to clean it.
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Old 11-08-2001, 10:26 AM   #274
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Quote:
Originally posted by Disaster999
i believe i post a question...where the answer?
Disaster...

I put all my bearings in a small ultrasonic jewelry cleaner. Then I relube with Mobil1. If they don't feel right after that, I replace them.

For what it's worth, anyone using the later style diffs with a thrust cone instead of a thrust bearing might want to keep some spare rear axle bearings. The bearing that goes in the outbard side of the diff hub (under the thrust cone) is forced to take all the thrust load in these diffs, and they usually go bad pretty quickly. Most of the ratchety diffs I feel on 1/12 cars are due to that bearing being bad, not dirty or pitted rings.

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Old 11-08-2001, 01:12 PM   #275
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Disaster999: I thought that your question was a Schumacher "Axis" question???
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Old 11-08-2001, 05:46 PM   #276
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Trips, where do you get an Ultrasonic cleaner?


I tried this the other night, take the rear axel out and tighten the diff down pretty tight, then put the axel in a drill, hold the wheel and run it. It make a really bad diff bearing better but still not perfect but good enough. Its not the best alternative but it gets a little more life out of the bearing.
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Old 11-08-2001, 07:05 PM   #277
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spongebob---

I got it off ebay. Just do a search on ultrasonic cleaner and you'll get a page or two of them.

The one I got was around $65 or so.

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Old 11-08-2001, 08:48 PM   #278
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Thanks for all the comments. I have a lot to think about. Other than the spare parts issue, you guys think the car is OK?
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Old 11-08-2001, 09:35 PM   #279
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The 12M looks very interesting to me, I'm very tempted to try one. The only issue I have is that it's pretty expensive to buy the car and then the graphite conversion. If they offered as a graphite kit out of the box like everyone else I'd more likely to go for it.

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Old 11-10-2001, 12:51 AM   #280
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Geppetto: we are not able to buy spareparts on a raceday here, so it doesnt make any difference to us which car we use. We have to get our sparepats in advance to the race or its finished if we brake something. With 4 cell racing I think you wont need much parts anyway.
About tires: the Jaco cost about 30% more than Corally here and are much more difficult to get, because when I need Corally I can allways order them from rccarinternational, doesnt take to long.
We are running 6 cells since I started in the mid 80īs and didnt switch to 4 cell like anyone else in Europe 3 years ago. We had some people racing 4 cell last year to get used to it for the european championship, but they went back happilly to 6 cell this season. We could smoke them racing them with our 6 cell cars, I really dont see a point in 4 cell. You should try it out, there is nothing compareble to a 6 cell 1/12th car. If you want to try it I would suggest a 14turn with gearing about 34-36mm, depends on motor and track.
First race to our national championship this weekend, whish me luck
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Old 11-10-2001, 06:15 PM   #281
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Hey Guys,
I need some help on gearing choices! I have a 12 L3 and run on a asphult road course that is setup for speed! Were running 4 cell stock motors with 8 min mains. Any help will be great!
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Old 11-11-2001, 09:43 AM   #282
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Do the CRC cars come with wheels?
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Old 11-11-2001, 10:12 AM   #283
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Spongebob:
Yep, I just got the 3.1 Carpet Knife and they come with wheels and tires..

Good kit IMO...
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Old 11-12-2001, 11:17 PM   #284
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How do 1/12 cars handle on poor asphalt? And what tire do you recommend for the 12L3 on surfaces like this? Also what servo and speedo do you guys use in you 1/12th cars.
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Old 11-12-2001, 11:28 PM   #285
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Quote:
Originally posted by rccarracer
How do 1/12 cars handle on poor asphalt? And what tire do you recommend for the 12L3 on surfaces like this? Also what servo and speedo do you guys use in you 1/12th cars.
IF the asphalt is bumpy and dirty, expect the car to handle poorly. The smoother the surface, the better the car will work.

We usually run Jaco pink rears and purple fronts on asphalt here.

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