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R/C Tech Forums Thread Wiki: 1/12 forum
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Last edit by: fenton06
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 04-06-2005, 04:15 PM   #12421
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I kind of figured that. The question about 1/12th scale remains, however.
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Old 04-06-2005, 04:45 PM   #12422
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The classes are...

Onroad
Pro10 6-Cell Stock
Pro10 6-Cell Mod
Pro10 4-Cell 19T GT-One
Pro12 4-Cell Stock
Pro12 4-Cell Mod

Oval
1/10 Nascar 4-Cell Stock
1/10 Nascar 4-Cell Mod
1/10 Nascar 4-Cell 19T
1/12 Nascar 4-Cell Stock
1/12 Nascar 4-Cell Mod

And it is May 13th - 15th this year.
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Old 04-06-2005, 05:31 PM   #12423
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I'm aware of what the flyer says.

But he's also stated that because ROAR rules have a "six cell maximum for all onroad classes" clause that six cells will be allowed in 1/12th scale.
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Old 04-06-2005, 05:50 PM   #12424
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Default USPCC rules

OK, I just checked the USPCC website and the USPCC Forum. The website has 1/12th scale listed as 4 cells (just as on the flyer). The latest update on the Forum (4.9.05) states that 6 cells will be allowed. It looks like the most current information is that 6 cells are allowed.

If that's the case you will have to run a 6 cell car to be competetive (especially in stock)
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Old 04-06-2005, 05:56 PM   #12425
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2. For all classes (except 12th oval, more on that in a moment) you are allowed to run up to 6 cells maximum in all classes.


This is a quote from on another board (rcracing.com) from someone using the name "uspancarchamps".

He sounds like he is running the event, so what are the real classes. He uses the ROAR rule book (that does have a 6 cell class) to justify running 12th scale as 4 or 6 cell with their respective weight limits. The track looks good, but pretty big. If anyone shows up with a 6 cell cars, the 4 cell cars will not be competitive (IMHO).
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Old 04-06-2005, 06:05 PM   #12426
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Time to dig out your old 12L3 chassis

I can't even imagine how fast 6 cell 12th scale mod would be using today's motor/battery technology. Looks like i'm gonna have to build up a 6 cell pack for my 12L

-James
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Old 04-06-2005, 06:07 PM   #12427
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Quote:
Originally posted by jrrc
2. For all classes (except 12th oval, more on that in a moment) you are allowed to run up to 6 cells maximum in all classes.
He posted the same set of rules clarifications on the 1/10th pan car forum here on RCTech. On rcracing.com he later said he had decided to run 1/12th "as it appears on the flyer" which says 4 cell. That was on March 30. I haven't seen that statement anywhere else. The rules update I referred to in my last post was made yesterday on the USPCC forum, so I would think that supercedes his March 30 statement. So the way I read it, it's 6 cells.

If you look at the pictures of the track, it is a gas track with wide lanes and lots of straight. Six cells will surely be faster than 4.
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Old 04-06-2005, 06:08 PM   #12428
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Quote:
Originally posted by JamesArluck
Time to dig out your old 12L3 chassis

-James
Well, that part should fit your budget, James
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Old 04-06-2005, 06:29 PM   #12429
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Quote:
Originally posted by odpurple
Well, that part should fit your budget, James
Already got one

-James
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Old 04-06-2005, 06:48 PM   #12430
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me too!
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Old 04-06-2005, 09:37 PM   #12431
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Default easy question

Just out of curiousity, with the 12l series reactive castor front suspension, it can use either the 0, 5, 10 degree setting.

For outdoor the 10 seems a little too much, the five seems better. Haven't yet tried the zero.

So I ask is the zero similar to an old school front suspension in how the car "feels" and reacts when driving? It obviously has more camber setup to control tire wear, so will it have similar off throttle turn in compared to the older style?

Also does anyone offer chassis sliders to install under the screw heads at the rear corner of the chassis. I realize ideal is to have nothing hanging below but on asphalt the corners are erroding away.

PK
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Old 04-06-2005, 10:02 PM   #12432
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Maybe we can start running LiPoly's by next year with brushless. This will definately outrun some Nitro's out there!
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Old 04-06-2005, 10:11 PM   #12433
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What are your thoughts on these?
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Old 04-06-2005, 10:51 PM   #12434
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radials are rubber tires designed for oval
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Old 04-07-2005, 01:33 AM   #12435
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Cool I always wondered if you could get rubber 12th tires, they grip well?
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