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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 02-26-2014, 09:11 PM   #40471
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thanks guys!
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Old 02-27-2014, 04:41 AM   #40472
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A video of the last round of the BRCA 1/12 nationals which were held in the middle of a shopping mall to try and generate interest in our hobby

http://vimeo.com/87656931
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Old 02-27-2014, 09:33 AM   #40473
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Default Assocaited R5.2 1/12th car

Is a new car on the horizon, totally unavailable in the Uk ,even importer has none.
Any whispers.
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Old 02-27-2014, 10:34 AM   #40474
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Quote:
Originally Posted by Skiddins View Post
A video of the last round of the BRCA 1/12 nationals which were held in the middle of a shopping mall to try and generate interest in our hobby

http://vimeo.com/87656931
Those GT looking cars...Are they Schumacher Supastox? They look awesome.
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Old 02-27-2014, 11:52 AM   #40475
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Quote:
Originally Posted by Nexus View Post
Those GT looking cars...Are they Schumacher Supastox? They look awesome.
Schumacher Supastox and Mardave EV12.
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Old 02-27-2014, 11:53 AM   #40476
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Default CLASS GT12

its a class that has revived 1/12th pan car racing in the Uk.At the moment there is 2 manufacturers in the class Schumacher and Mardave .Car costs under 100 with in the rules
13.5 blinky 1s racing .
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Old 02-27-2014, 03:21 PM   #40477
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Some great coverage of that race here as well: http://www.youtube.com/watch?v=kdNGD_pnOTU
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Old 02-28-2014, 12:26 AM   #40478
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when one talks of "double steering" what exactly are they describing and how do you fix that?
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Old 02-28-2014, 08:34 AM   #40479
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Double steering is when you enter the corner hard the car starts to turn in nicely and then starts to push mid corner and then turns harder at the exit. Since we take corners soo fast it appears as a wiggle during the corner.

Easiest solution is to go heavier on the damper tube to slow the transition in the corner.


since the fluid is too loose for that corner the twisting actions happens too fast and the springs throw the pod back straight before coming back creating an oscillation. Thickening the damper tubs slows this action down allowing the springs to catch the weight of the car without over compressing and causing the "Double Steer"

but if go too far, inside rear tires will lift in tight corners.
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Old 02-28-2014, 10:41 AM   #40480
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Quote:
Originally Posted by Nexus View Post
Those GT looking cars...Are they Schumacher Supastox? They look awesome.
GT12 was introduced as an entry level pan car class suitable for club and regional level racing in the UK. The cars are of simple design - flat GRP chassis, simple suspension, a price limit of 100 (about $150) on a rolling chassis kit and limited modifications/upgrades. They use GT style bodies (Ferrari F430 and the like), a ball diff and run on foam tyres (26mm width front & rear) with 13.5 motors, 1S batteries and 'blinky' speedos.

Schumacher and Mardave both market cars for the class.

It has literally exploded and is hugely popular in the UK. Lots of drivers have moved over to it from electric tc's and buggies for their winter indoor racing as it's a much cheaper, simpler alternative. Several clubs have also reported to me that GT12 has 'saved' their club from going under as it has enabled their members to continue racing despite the poor economic climate.

The class has existed for about 2 years at national level competitions, and just recently we have started to get a few drivers migrate over to racing 'proper' 1/12 scale (what we call LMP12) having run GT12 for a while.

10-12 years ago you'd be lucky to get 50 drivers to a BRCA 1/12 national. This season all 6 of our nationals have been over-subscribed (110 drivers at each - 80 LMP12 and 30 GT12) and we've had to introduce reserve lists for most of the classes.

We're having a blast!
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Old 02-28-2014, 11:32 AM   #40481
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Quote:
Originally Posted by Mark Stiles View Post
GT12 was introduced as an entry level pan car class suitable for club and regional level racing in the UK. The cars are of simple design - flat GRP chassis, simple suspension, a price limit of 100 (about $150) on a rolling chassis kit and limited modifications/upgrades. They use GT style bodies (Ferrari F430 and the like), a ball diff and run on foam tyres (26mm width front & rear) with 13.5 motors, 1S batteries and 'blinky' speedos.

Schumacher and Mardave both market cars for the class.

It has literally exploded and is hugely popular in the UK. Lots of drivers have moved over to it from electric tc's and buggies for their winter indoor racing as it's a much cheaper, simpler alternative. Several clubs have also reported to me that GT12 has 'saved' their club from going under as it has enabled their members to continue racing despite the poor economic climate.

The class has existed for about 2 years at national level competitions, and just recently we have started to get a few drivers migrate over to racing 'proper' 1/12 scale (what we call LMP12) having run GT12 for a while.

10-12 years ago you'd be lucky to get 50 drivers to a BRCA 1/12 national. This season all 6 of our nationals have been over-subscribed (110 drivers at each - 80 LMP12 and 30 GT12) and we've had to introduce reserve lists for most of the classes.

We're having a blast!
That's a perfect example that one doesn't need much technology or complication to have fun!

Does the GT12 class run spec tires, or perhaps a limited number of allowed compounds?
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Old 02-28-2014, 12:50 PM   #40482
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Quote:
Originally Posted by jdeadman View Post
Double steering is when you enter the corner hard the car starts to turn in nicely and then starts to push mid corner and then turns harder at the exit. Since we take corners soo fast it appears as a wiggle during the corner.

Easiest solution is to go heavier on the damper tube to slow the transition in the corner.


since the fluid is too loose for that corner the twisting actions happens too fast and the springs throw the pod back straight before coming back creating an oscillation. Thickening the damper tubs slows this action down allowing the springs to catch the weight of the car without over compressing and causing the "Double Steer"

but if go too far, inside rear tires will lift in tight corners.
Thanks for the explanation!
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Old 02-28-2014, 01:22 PM   #40483
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We run either Contact or Mardave tyres.

Once you have sorted the tyres that work then rather like 12th you only need a few in the box. I use Contact 40 shore rear and 50 shore front almost everywhere, with 37 rears if the grip is low. They wear like iron and cost about 7 ($10) a pair or less. I've had four sets for this season and they have worn about 0.6mm off in 30 races rotating them around. Once you find a set-up very little needs changing to suit different tracks.

The simple suspension design limits grip and the weight (950g) slows it all down so everyone can drive one. Like all RC classes, if you can drive you can win. You can put a car on the track for half the cost of a 12th car and still have something that will put you where your driving skills deserves. As Mark says, it has 'saved' many clubs, and larger meetings for the class attract about 50 to 60 drivers.

It's great class that makes the most of the reliability of LiPos and BL motors, whilst giving people a car to race that looks like the real thing and handles in a way that everyone can adapt to whatever class they run in the summer.
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Old 02-28-2014, 03:28 PM   #40484
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In general, what are some things I can do to increase straight line stability (reduce dartiness around neutral) in low grip (unprepared) asphalt conditions?
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Old 02-28-2014, 06:19 PM   #40485
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Quote:
Originally Posted by Radio Active View Post
In general, what are some things I can do to increase straight line stability (reduce dartiness around neutral) in low grip (unprepared) asphalt conditions?
I would recommend adjusting your front end to have bump toe-out by angling the ends of the links up with shims or finding a way to lower the mounting point at your servo. If that doesn't work, going to a stiffer, less aggressive front end while saucing more of the front tire to keep steering may help.

Not all cars will react the same to changes, though.
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