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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 07-24-2005, 08:07 PM   #13831
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Quote:
Originally Posted by Rysuleod
I'm using a Futaba 9650 digital and it's working well so far.
Digital servos draw a lot of current even in 1/12th cars. If you run a digital servo consider an RX pack mandatory. I run an Airtronics 94145 (not digital) and have been for years.
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Old 07-24-2005, 08:20 PM   #13832
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Quote:
Originally Posted by odpurple
The Speed 8 has been around for a long time but is still one of the best bodies for 1/12th scale. It's quite neutral and the lightest body available. The back half of the Zytec is the same as the Speed 8 but it has more steering due to the design of the front end.
Alright, it was the speed 8 I used to run because I remember they only lasted a couple runs because of how thin they were. That body is good.
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Old 07-24-2005, 08:23 PM   #13833
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Quote:
Originally Posted by Randy Caster
Alright, it was the speed 8 I used to run because I remember they only lasted a couple runs because of how thin they were. That body is good.
The thin one (.020) only lasts a few races. The thick one (.030) is fairly durable.
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Old 07-24-2005, 08:27 PM   #13834
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Quote:
Originally Posted by JRX-S Bill
The thin one (.020) only lasts a few races. The thick one (.030) is fairly durable.
Yeah but the cool kids will make fun of you if you run an .030...lol!
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Old 07-24-2005, 08:36 PM   #13835
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Quote:
Originally Posted by AdrianM
Digital servos draw a lot of current even in 1/12th cars. If you run a digital servo consider an RX pack mandatory. I run an Airtronics 94145 (not digital) and have been for years.
Runtime with the new big batteries (IB3800) has not been an issue with me so far, but you bring up an interesting question. How much more current are we talking about here?
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Old 07-24-2005, 09:31 PM   #13836
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over the years for me, i have always found when choosing a lexan body whether it HO slot cars, 1/24 scale slot cars and 1/12th scale RC. lite and thin was the way to go.

they seem for me to handle best hands down, and seem to bring out the best performance no matter what i have run over the years.

however, the thin bodies tend to wrinkle and tear easier from wrecks/hits.
the thick bodies tend to crack easier especially around the front wheel wells from hits and wrecks.

the only reason my current 2 bodies (Zytec and Parma Speed 8) are thick, was due to our local hobbyshop having a hard time getting the thin ones.

even online stores have problems keeping the light ones in stock. when they come in....they're gone

Note: not a shameless plug. checkout speedtechrc.com or kthobbies.com. they usually get the thin bodies and are 9/10 times when i check them...out of stock.
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Old 07-24-2005, 09:33 PM   #13837
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Quote:
Originally Posted by JRX-S Bill
The thin one (.020) only lasts a few races. The thick one (.030) is fairly durable.
I crash a lot less now than I did back then, so I'll go with the .020 for the weight. You goin to the Intl. Champs Bill?
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Old 07-24-2005, 09:37 PM   #13838
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Quote:
Originally Posted by Rysuleod
Runtime with the new big batteries (IB3800) has not been an issue with me so far, but you bring up an interesting question. How much more current are we talking about here?
i have a digital s9550 Fut-servo in my TC. i can't find the instructions at this moment. futaba warns of the extra power comsumption especially for gas-model users. the digital servos actually work faster, and spend more time checking their positions, making corrections, etc. stuff that other servos never did and we would never really notice

in one of my 12ths it has a FET-digital JR servo DS3421 (same case as the JR Z3550)
i ran 3800's and a rec pk in the main with a 11D motor. i wasted power and didn't dump. the rec pk is more of a security habit.
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Old 07-24-2005, 09:57 PM   #13839
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Quote:
Originally Posted by Randy Caster
I crash a lot less now than I did back then, so I'll go with the .020 for the weight. You goin to the Intl. Champs Bill?
Doing the SJGP support race next week and have a week off in August for mountain biking. Then will start working towards the ROAR regional events. Probably won't make Lost Wages.
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Old 07-24-2005, 11:10 PM   #13840
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Quote:
Originally Posted by JRX-S Bill
Doing the SJGP support race next week and have a week off in August for mountain biking. Then will start working towards the ROAR regional events. Probably won't make Lost Wages.
aah too bad man, Vegas looks like it's gonna be an awesome race.
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Old 07-24-2005, 11:20 PM   #13841
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Quote:
Originally Posted by Randy Caster
I never noticed the problem on my switchblade, is it caused by crashing or just regular driving? I just went ahead and ordered a reflex 12 since the cefx doesnt seem like it's going to happen. Hopefully my kit comes with all of the parts included unlike my switchblades lol.
Well, yea it happens when you hit stuff, and I hit stuff now and then

-Korey
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Old 07-24-2005, 11:51 PM   #13842
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Quote:
Originally Posted by Sushi Boy
Well, yea it happens when you hit stuff, and I hit stuff now and then

-Korey
When I raced 1/12 scale last I was hittin every corner that I could, and still didn't notice tweak issues with the front end. The Trinity car was my favorite back then and hopefully this one will be good to me as well.
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Old 07-24-2005, 11:59 PM   #13843
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Quote:
Originally Posted by Randy Caster
When I raced 1/12 scale last I was hittin every corner that I could, and still didn't notice tweak issues with the front end. The Trinity car was my favorite back then and hopefully this one will be good to me as well.
Hey Randy... I have sent you a PM about the nice 12th that you were looking for
-Dave
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Old 07-25-2005, 02:04 AM   #13844
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Just got a new JR Z3550 servo.....

and a JR RS310 receiver to go in my 1/12th when it arrives. I hooked it all up with the Esc just to check if it goes and I'm wondering is it normal for this servo to twitch/glitch (make a gear noise, or whatever you want to call it lol)?

The output isn't actually moving much (barely perceptible) but it sure "sounds" like it is.

At the moment servo travel is set to 100% and it does seem to ease off/stop at 70% or less but I just tried my previous standard size servo and not even the slightest sound.

Last edited by Mabuchi540; 07-26-2005 at 03:01 PM.
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Old 07-25-2005, 09:27 AM   #13845
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hey guys,please check out this link,i have a 12 L3 for sale..thanks!

http://www.rctech.net/forum/showthre...72#post1717172
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