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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 01-20-2011, 01:48 AM   #35341
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Quote:
Originally Posted by CypressMidWest View Post
Wow!! One race every two years!!! And hey, it only takes MASAMI to be the tire bitch/pit strategist to make it happen, You're right, totally superior performance....

Give me week in/week out performance every time. If they hadn't started the worlds with weak tire additive things might have been different.

I'll take a proven performer everytime, and that's CRC high rollers. IIC, Snowbirds, and Cleveland, ya know, the REAL Carpet races......
Not taking anything away from any other tire brand, but Masami has been using them for years and now his mini me version They always have an edge with those tires, mostly on asphalt though, carpet is another story.

Anyway we were talking about the rims, not the tires... I would say Yokomo tires on any other rim would also be great... It's the rubber that makes the biggest difference....
AGAIN NOT SAYING CRC or any other brand is not good!!!! I have used different brands under different conditions and they all have an advantage somewhere...

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Old 01-20-2011, 05:28 PM   #35342
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Default new crc pan car

a few months ago i thought i read that crc were working on a new 1/12th. any news or update on a expected release date

any information would help, thinking about trying the new TOP pan car and would like to compare

thanks guys
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Old 01-20-2011, 08:35 PM   #35343
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Quote:
Originally Posted by BrodieMan View Post
I am organizing a club for this summer, looks like we will be running on a specialized Soap Box Derby track. It's basically a two lane road that's in pristine condition. I plan on pushing RCGT but was curious if 1/12 would run well on regular asphalt??
Yes if the asphalt is smooth enough it can be done very easily. Its best if you can lay down some type of sugar water or soda to help with the grip.
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Old 01-21-2011, 06:13 PM   #35344
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i'm new in 12th scale, planning to use LRP SXX TC Spec speedo..should i use extra battery for receiver?
can give me info what brand and type the battery is?
thanks.
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Old 01-21-2011, 09:45 PM   #35345
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Hey I`m currently using the LRP SXX TC SPEC V1 in my Associated 12R5.1

When I was using IB 5000mah 4.8v nimh batteries(cells)I had know trouble but since moving to LIPO 3.7v. I`ve had to add a 6.6volt LIFE reciever battery pack 200mah or the speedo would just shut down due to low voltage over a 8 minute run Mod it uses around 50mah from fully charged.

And when using a LIFE theres no need to use any voltage regulators

Hope this helps

Cheers Daniel
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Old 01-22-2011, 12:37 AM   #35346
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Originally Posted by t4m1y4niac View Post
i'm new in 12th scale, planning to use LRP SXX TC Spec speedo..should i use extra battery for receiver?
can give me info what brand and type the battery is?
thanks.
All the LRP speedos have a 6v output as standard so no need for a reciever pack
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Old 01-22-2011, 03:57 AM   #35347
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thank youuu
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Old 01-22-2011, 08:23 AM   #35348
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Quote:
Originally Posted by sidecarphil1 View Post
All the LRP speedos have a 6v output as standard so no need for a reciever pack
I do not use LRP but do all of them have a 6v BEC with a 1 cell, 3.7v input? That would mean that they all have a built in voltage booster, I don't think they do but I could be wrong.
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Old 01-22-2011, 09:07 AM   #35349
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Default 17.5 no timing rollout

okay, so what kind of rollout has anyone run with 17.5 no timing?

I realize that it will vary from track to track, but just trying to get a starting point.

Thanks
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Old 01-22-2011, 09:11 AM   #35350
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Originally Posted by BCbud View Post
I do not use LRP but do all of them have a 6v BEC with a 1 cell, 3.7v input? That would mean that they all have a built in voltage booster, I don't think they do but I could be wrong.
Yes the LRP SXX and SXX stock specs have built in boosters

TAKEN FROM LRP.COM

TwinBEC: A true BEC revolution! Constant 6V/3A output with 3.0V to 7.4V batteries. No receiver battery with 1S LiPo needed.
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Old 01-22-2011, 10:09 AM   #35351
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Originally Posted by sidecarphil1 View Post
Yes the LRP SXX and SXX stock specs have built in boosters

TAKEN FROM LRP.COM

TwinBEC: A true BEC revolution! Constant 6V/3A output with 3.0V to 7.4V batteries. No receiver battery with 1S LiPo needed.
I knew that 1 or 2 of the newer ones did but the statment was all of them do and the older ones do not.
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Old 01-22-2011, 10:59 AM   #35352
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Originally Posted by oldrcr View Post
okay, so what kind of rollout has anyone run with 17.5 no timing?

I realize that it will vary from track to track, but just trying to get a starting point.

Thanks
The track I was running has a 30m straight, and is fairly technical. Ran the car with 82mm rollout, and 45 deg advance (on the end bell). Worked rather well.

Shawn.
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Old 01-22-2011, 11:28 AM   #35353
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Originally Posted by Shawn68z View Post
The track I was running has a 30m straight, and is fairly technical. Ran the car with 82mm rollout, and 45 deg advance (on the end bell). Worked rather well.

Shawn.
Thanks for the reply. We are currently running 13.5 with no timing and are running around 82.

I suppose different motors will also be different. 1s rotors too.

I did find a post where some were running over 100 for rollout. So, I guess I am still fishing for what others have found. Try to include what motor as part of the info.
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Old 01-22-2011, 11:38 AM   #35354
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AFAIK his point was the 6V boost didn't last him 8 minutes so he got the receiver pack.
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Old 01-22-2011, 01:54 PM   #35355
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Originally Posted by chris moore View Post
Yes if the asphalt is smooth enough it can be done very easily. Its best if you can lay down some type of sugar water or soda to help with the grip.
Thanks Chris, I want to push the classes that are reasonably inexpensive to get into at a competitive level such as RCGT. I know they are tricky to setup but I think 1/12 would be a good class for a new club, plus if we get an indoor carpet track next winter we might have an established 1/12 class.
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