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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 11-22-2004, 04:51 PM   #9346
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what pinion should i use on a L3 with a monster stock and a 100 toothe 64-pitch pinion.

thanks
marshalv.

also does any one know why my batteries wont charge on my pulsar comp? they came with the car and they were shorted down to 0volts or whatever. so now they wont start charging. is there a way to give them a jump or something?
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Old 11-22-2004, 05:07 PM   #9347
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It depends on your track size and how big your rear tires are too...
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Old 11-22-2004, 05:09 PM   #9348
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just an idea. i just need somewhere to start. im new to 1/12.
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Old 11-22-2004, 05:10 PM   #9349
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I'm running a 26tooth pinion with 46.5mm rears
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Old 11-22-2004, 07:21 PM   #9350
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Quote:
Originally posted by whynot
Can anyone tell me the pros and cons of the T-fource and the 3.2R which is a better car and why.Thank you in advance.
I have same question?
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Old 11-22-2004, 07:23 PM   #9351
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what amperage dop you guys charge 4-cell packs at?

thanks marshalv
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Old 11-22-2004, 07:35 PM   #9352
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I charge mine at 5 amps sometimes 4.5 for mod.

-Korey
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Old 11-22-2004, 07:54 PM   #9353
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Quote:
Originally posted by dado11g
also does any one know why my batteries wont charge on my pulsar comp? they came with the car and they were shorted down to 0volts or whatever. so now they wont start charging. is there a way to give them a jump or something?
Hook another charged 4 cell pack + to + and then - to -(parrellel) then charge the pack.

*edit* only to get the voltage up a little, 10-20 seconds. Then charge it seperately.

Last edited by fatdoggy; 11-22-2004 at 08:03 PM.
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Old 11-22-2004, 07:55 PM   #9354
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thanks guys for the batter help. its all workin fine now

thanks
marshalv.
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Old 11-23-2004, 05:17 AM   #9355
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jc510,whynot,
I run a Tbar car now,but back in the day when the spring car came out I ran it and liked it very well.Back in March at the nats I talked with Frank Calandra about the car the T-Force car and he told me he had alot of request for the car do they decided to design one to make both sides happy T-bar and spring people,Than I asked him why he wasnt running the Tbar car and he told me it was a matter of preference and that he jus like the spring car cause hes been driving it so long.When I was at the Halloween race I talked with Eli Ezrow about the T-bar car and he loved it and of course he was dialed like always and he said the same as Frank that at that time it was a matter of preference to which car to run.I also noticed that he still taped his batteries in and he told me that he liked taping them in that was all he said.So I guess it boils down to your preference both cars are fast and easy to drive just a matter of which one fits your style of driving,Id suggest seeing if you know someone who has a spring car to run it and to run a t-bar car than decide which is better for you also the way calandra makes the car you can get one of them and than a conversions kit of the other to try and decide for yourself.
I will tell you one thing tho Calandra was working on a new front end for the 12th scale that was way cool and hard to explain but the frt end has damping on the right and left side.He told us that they were refining it as they run it and that it should be out by the next Halloween race he said that it had a yr of testing left on it.
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Old 11-23-2004, 05:31 PM   #9356
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hi guys i just got my rc12l3 and i notice that i cant fit a standard size servo in it. i tried to shove it in there and the servo mount flexes. is there any way i cant use a standard size servo in it? or i have to buy a mini servo?
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Old 11-23-2004, 05:39 PM   #9357
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A micro servo is always good... but you probably can shoe goo the servo onto the chassis but with a standard servo in it you may have to be careful on the size of your esc and reciever...

Aaron
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Old 11-23-2004, 06:39 PM   #9358
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what servo are u guys using in your 12th scales?
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Old 11-23-2004, 07:27 PM   #9359
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Airtronics 94145 micro. It is perfect!
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Old 11-23-2004, 07:29 PM   #9360
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I am looking for an old school front end but have not had any luck finding one. Does anyone know where I can get one?
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