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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 07-05-2006, 06:09 PM   #19156
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Informally leafing through the photos from the race, it looked like the CRC High Rollers did pretty well at the Worlds, including an appearance on the winning car of Spashett.


They certainly do look good, that's for sure.



What does everyone else think of them that has used them?
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Old 07-05-2006, 06:12 PM   #19157
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Quote:
Originally Posted by smojoe
No matter what, I still like the looks of the 12X front end. Less stuff to get sloppy.

Anyone (independent) working on any new front ends? or do I have to sit down and daydream my own up?

there are alot of other front ends that have been done. years back Trinity had a monoshock front end. in the early 80's AE had a shock front end, think they still have some for sale. HPI had a front end that looks at first like a AE Dynamic front end but the bottom arm moved and the top is fixed. Yokomo had a front end from there 1/10 pan cars some tried on the 12th, it is somewhat similiar to and predates the CEFX front end. Trinity other that the Dieter/Kyosho front end from the Switchblade they had their own dynamic type front end. www.Laje.se has unique frontend on their Speed Evil-12. Speedmerchant was testing a V-2 front end (was shown on their site at one time) and CRC has tested various frontends on the CK. plus many, many more.

seems like the AE old school front end or the AE Dynamic front end is still the ones people mostly choose. good luck in designing one to beat these
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Last edited by fast-ho-cars; 07-05-2006 at 06:58 PM.
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Old 07-05-2006, 06:13 PM   #19158
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Quote:
Originally Posted by protc3
considering it was due to be released right after the worlds,the one in the pictures.and as for the rear suspension changes,what do you think it consists of?the AE T plate,changed weight transfer rate from the moved shock and pivot location.so yes,that is alot.

i in no way am bashing corally or there car.i am just stating that it was not a standard corally.most of the pros change there cars up.i dont knock em for that.thats what they feel is going to work.in this case it did.congrats to dave on his win.he is an unreal driver and he deserved it.hatss off to him for making the car work the way it did.if anyone could make a car work great it is him.enough of the bickering and lets get back to 1/12th chat.
I though it was 1/12th chat The more pictures I see it looks like there were no two Corallys (Corallies?) alike there. I think Spashett's car had the Corally t bar, and someone else changed thiers to AE. Anyway, it's fun to see the developement of a race car happpen in stages right before our eyes.
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Old 07-05-2006, 06:16 PM   #19159
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Quote:
Originally Posted by Tekin
Here's something I just spotted.
In the picture you can see a Laje (swedish) car. But it's not a stock one. The stock one is a T-bar car and this one is a Link car.
Looks like they are experimenting some new things.
It is Team Laje's latest car, the Corner Thief. It is a link car with some very well thought out engineering. Not quite in production yet, but soon.
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Old 07-05-2006, 06:19 PM   #19160
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Default new Hot Bodies Hara 1/12th? Worlds 2006

rear pod lower plated is finned aluminum, looks like some team Riemon stuff i've seen on Kawada cars
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Old 07-05-2006, 06:23 PM   #19161
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Quote:
Originally Posted by fast-ho-cars
rear pod lower plated is finned aluminum, looks like some team Riemon stuff i've seen on Kawada cars
I think the entire rear pod is actually one piece! Good maybe for Hara; not for someone who hits stuff like me
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Old 07-05-2006, 06:25 PM   #19162
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Default Kyosho 12th? at the Worlds

looks like they borrowed some parts too...
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Old 07-05-2006, 06:25 PM   #19163
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Perfect axle alignment, at least. Nice.
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Old 07-05-2006, 06:27 PM   #19164
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mike, i forgot the close-up of the pod...it is 3 separate interlocking parts.
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Old 07-05-2006, 06:30 PM   #19165
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Quote:
Originally Posted by fast-ho-cars
there are alot of other front ends that have been done. years back Trinity had a monoshock front end. in the early 80's AE had a shock front end, think they still have some for sale. HPI had a front end that looks at first like a AE Dynamic front end but the bottom arm moved and the top is fixed. Yokomo had a front end from there 1/10 pan cars some tried on the 12th, it is somewhat similiar to the CEFX front end. Trinity other that the Dieter/Kyosho front end from the Switchblade they had their own dynamic type front end. www.Laje.se has unique frontend on their Speed Evil-12. Speedmerchant was testing a V-2 front end (was shown on there site at one time) and CRC has tested various frontends on the CK. plus many, many more.

seems like the AE old school front end or the AE Dynamic front end is still the ones people mostly choose. good luck in designing one to beat these
Who makes/made the front end on car in the 2nd picture? upper and lower arms with shocks. Daddy like
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Old 07-05-2006, 06:35 PM   #19166
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CRC Carpet Knife prototype from a few years ago. I don't think anything ever materialzied with that design, though.
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Old 07-05-2006, 06:36 PM   #19167
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Default CRC CK Worlds car

maybe i missed it before in this thread? i doubt it because of the rear pod
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Old 07-05-2006, 06:43 PM   #19168
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Default reversed engineered copy of AE Dynamic FE

AH-12 carpet version (not the one that's been available) with the Kawada front end...look closely at it. i have heard it's better than the AE, but parts and availibility are the issue/problem
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Old 07-05-2006, 06:44 PM   #19169
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its nice to see that there is alot going on with the 1/12ths now.it just goes to show the growing interest.im also working on a few new tidbits such as rear end and front end.i will show the proto pics as soon as i get some stuff completed.
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Old 07-05-2006, 06:47 PM   #19170
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I like the new transponder mounting area on the CRC prototype that Calandra was running. Very nice idea.
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