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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 09-28-2007, 10:07 PM   #27046
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I have a L3, i need to ask one thing, without the motor in, is it normal for the spur to maybe have alittle play, but barrely, definitly not 100% stiff???
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Old 09-28-2007, 10:19 PM   #27047
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Originally Posted by rsxskyd View Post
I have a L3, i need to ask one thing, without the motor in, is it normal for the spur to maybe have alittle play, but barrely, definitly not 100% stiff???
If you mean "play" side to side (will wobble a bit) that is normal. It comes from the balls being a bit wider than the spur so the spur will move back and forth, limited by the spur coming into contact with the diff rings. If the balls WEREN'T wider we wouldn't get diff action.

If you mean an up and down motion relative to the axle then no it shouldn't do that.
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Last edited by Scottrik; 09-28-2007 at 10:55 PM.
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Old 09-28-2007, 10:38 PM   #27048
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thank you so much for the help, up and down no not that, but what you just explained is perfect and helpful, awesome thanks man
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Old 09-29-2007, 12:58 PM   #27049
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Exclamation I NEED HELP!

i have a 12L4 and its been about 2 years or so now. I am running on crc carpet and using jack the gripper. My car is extreemly inconsisetant one run it will be on rails and i wont change a thing and the next run the car will be so loose or pushy i can even drive it.
If anyone can post some set ups with tires, t plate, shock oils springs, and all that i would be very thank ful! Thanks in advance also!
Jason
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Old 09-29-2007, 03:52 PM   #27050
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I used to use Jack with an L4 and found the following:

On first application grip would be great from the off but go loose at about the 6:30 mark.

On 2nd application tyes would be loose for 2 - 3 laps, then work fine till about the 6 min mark then be really off.

Never used they same tyres more than 2x a day...

I changed to CS-Grip (from Schumacher) and the car is good for the whole run.
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Old 09-30-2007, 08:49 AM   #27051
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i use jack
at the track where i run FASTCATS we can only run niftech or jack coz of the smell thing.
i think its a good thing coz if paragon was there i would not run.
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Old 09-30-2007, 05:33 PM   #27052
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Default 12L4

Hey, guys, I'm new at this 1/12 racing stuff. I started the rc hobby with rc drifting. I just picked up a 12L4 on here. I took it out for the first time today. The road course wasn't set up. All we had was the carpet oval. I have to admit, it is pretty fun. Are there any basic tips for 1/12 racing or the 12L4 in particular? There's gotta be some setup tips, hints, etc. One thing I did learn from lurking through the race threads is that slow is fast when it comes to learning how to race.
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Old 09-30-2007, 10:34 PM   #27053
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What do you guys use as a tool for setting up the angles on these cars? I'm coming from 1/10, so i'm familiar with the Hudy type gauges, but have no clue what is used on a 12th scale car.

Thanks in advance.

-Steve
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Old 10-01-2007, 12:01 AM   #27054
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I am getting a GTB + 13.5SS for my 3.2r, what is the gear ratio people use on a small to medium track ?
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Old 10-01-2007, 07:00 AM   #27055
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Quote:
Originally Posted by bsmooth View Post
What do you guys use as a tool for setting up the angles on these cars? I'm coming from 1/10, so i'm familiar with the Hudy type gauges, but have no clue what is used on a 12th scale car.
I use the Niftech alignment gauge. Runs $25, works like a charm. Little bit of a learning curve. WILL set camber and toe angles, though I prefer to use my RPM camber gauge for setting that angle. It's also great for confirming that the rear axle is centered relative to the car. So relatively inexpensive I have one in my race kit and one on my bench.

If you're willing to spend more the Unity Tweak/Alignment station is pretty top notch. I've got one and have used it but prefer the simplicity/small size of my Niftech gauge. For $160 or so it DOES come with an integral tweak bar (add $50-60 to the Niftech if you don't already have one).
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Old 10-01-2007, 07:57 AM   #27056
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Quote:
Originally Posted by Scottrik View Post
I use the Niftech alignment gauge. Runs $25, works like a charm. Little bit of a learning curve. WILL set camber and toe angles, though I prefer to use my RPM camber gauge for setting that angle. It's also great for confirming that the rear axle is centered relative to the car. So relatively inexpensive I have one in my race kit and one on my bench.

If you're willing to spend more the Unity Tweak/Alignment station is pretty top notch. I've got one and have used it but prefer the simplicity/small size of my Niftech gauge. For $160 or so it DOES come with an integral tweak bar (add $50-60 to the Niftech if you don't already have one).
I forgot about the Unity model. I almost bought that for my 1/8 car, but went w/ the Hudy all in one instead. I may go w/ the Niftech since I already have a MIP tweak board.

Thanks for the help.

-Steve
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Old 10-01-2007, 07:58 AM   #27057
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Hi,

I've a question about the new JACO Prisms...
What's the minimum front and rear width you can achieve?
I'm just interested as with the CRC High Roller you have a very wide range of adjustment for track width.

Thanks
Cheers
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Old 10-01-2007, 08:21 AM   #27058
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Quote:
Originally Posted by Car Breaker View Post
I am getting a GTB + 13.5SS for my 3.2r, what is the gear ratio people use on a small to medium track ?
I would start at a 2.0" rollout and go up or down from there. Just run the car for about 4 minutes and check the temp on the motor (I just do it by feel). If it's very hot to the touch gear down and try again.

Other than that, play with the gear to get the fastest laptimes. The motor temp is nothing more than a safety factor and it will shut down if you overgear it (saving the motor).
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Old 10-01-2007, 08:29 AM   #27059
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The Jaco's should have the same offsets as the CRC tires. I know that they're the same (or very close) in the rear and they should be the same in the front.
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Old 10-01-2007, 10:34 AM   #27060
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Quote:
Originally Posted by Car Breaker View Post
I am getting a GTB + 13.5SS for my 3.2r, what is the gear ratio people use on a small to medium track ?
adrianM said to run a 2.65" to 2.70" or 44mm roll and I put that on mine with a 70' straight and it seemed about perfect.
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