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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 08-15-2006, 07:38 PM   #19921
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the only problem with the thin tbar is that it will be easy to snap the tbar. but once you get the hang of carpet, you will see how much faster and how much smoother the thin tbar is on carpet.
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Old 08-15-2006, 07:42 PM   #19922
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Quote:
Originally Posted by trickd122
New to 1:12 scale what's all this equipment.
I see the transponder the weights the receiver pack the obvious battery pack
ESC, what is that to the right of the receiver pack? that motor what is that?
The chassis is this a yokomo.....
looks like a cap for the esc
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Old 08-15-2006, 07:47 PM   #19923
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Quote:
Originally Posted by trickd122
New to 1:12 scale what's all this equipment.
I see the transponder the weights the receiver pack the obvious battery pack
ESC, what is that to the right of the receiver pack? that motor what is that?
The chassis is this a yokomo.....
to the right is a lead wt with a pice of carbon tape he still had to add some wt and did not have some with carbon on it. the motor is one of the new style of yokomo
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Old 08-15-2006, 08:00 PM   #19924
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Quote:
Originally Posted by trickd122
New to 1:12 scale what's all this equipment.
I see the transponder the weights the receiver pack the obvious battery pack
ESC, what is that to the right of the receiver pack? that motor what is that?
The chassis is this a yokomo.....

2nd pic is another car not sure who's I beleive andy moore's
What's that thing on top of the servo?
It appears that the receiver was stripped of it's case
to possibly save weight
In front of the ESC are those diodes or batteries?

this 3rd pic no ides who's car however
what's infont of the ESC
Pic 1 to the right of the rec pack in the photo is the capacitor for the esc. Yokomo car.

Pic2 on top of the servo is the voltage regulator for the lipo rec pack. there are two caps in front of the esc.

Pic 3 Hara's car from the recent worlds, I think. Showing a capcitor in front of the esc again.
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Old 08-15-2006, 08:00 PM   #19925
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Quote:
Originally Posted by RAL
Thanks for all the help. We'll be running 19t. I have some grey and pink rears and purp fronts. So keep the .063 plate from the asphalt setup huh..hmm. I'll have to wait and try it out. schurcr say hi to Crash, JrRc(Damn Jims fast) and ODpurps for me theisgroup thank you too.

Thanks for the compliment. I'll be in Santa Barbara this weekend......any racing going on (especially 12th scale).
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Old 08-15-2006, 08:25 PM   #19926
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Default Broken chassis on Yok YRX-12WE

About a 1 1/2 months ago I bought a used YRX-12WE. Without all the gory details I have broken the chassis. I have emailed Yokomo to see about a replacement and no reply so far (about a week). My LHS hasn't been able to locate a chassis for me also. So here's the questions...

1) Anyone know where to get a replacement chassis?

2) If I can't find one what chassis can I replace it with? or should I just upgrade to some other kit?

Oh... I have only raced on carpet and will probably do so 99.9% of the time. Plan on running stock but have been running 19T because that is the only class til more racers start coming back in the fall/winter.

Thanks,

Paul
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Old 08-15-2006, 09:43 PM   #19927
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p2, carlos:

what are the setting you have on your sphere?
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Old 08-15-2006, 09:52 PM   #19928
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Old 08-15-2006, 10:09 PM   #19929
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Quote:
Originally Posted by theisgroup
p2, carlos:

what are the setting you have on your sphere?
Mode 1: value 2
Mode 2: value 3
Mode 3: value 0 or 1
Mode 4: value 0 or 1

The last 2 depends on my entring a corner or exiting with speed.
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Old 08-15-2006, 10:10 PM   #19930
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Quote:
Originally Posted by jrrc
Thanks for the compliment. I'll be in Santa Barbara this weekend......any racing going on (especially 12th scale).
Jim check out this link and ask them, they'll know. Unprepped asphalt...I don't know if 12th will work there.

Racing in Santa Barbara Ca.
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Old 08-15-2006, 10:59 PM   #19931
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Quote:
Originally Posted by padailey
About a 1 1/2 months ago I bought a used YRX-12WE. Without all the gory details I have broken the chassis. I have emailed Yokomo to see about a replacement and no reply so far (about a week). My LHS hasn't been able to locate a chassis for me also. So here's the questions...

1) Anyone know where to get a replacement chassis?

2) If I can't find one what chassis can I replace it with? or should I just upgrade to some other kit?

Oh... I have only raced on carpet and will probably do so 99.9% of the time. Plan on running stock but have been running 19T because that is the only class til more racers start coming back in the fall/winter.

Thanks,

Paul

Contact Doug Powell at PRC he has replacement chassis parts for the yoke. His email is quad12@comcast.net

Tell him speedxl sent ya!
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Old 08-15-2006, 11:09 PM   #19932
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Quote:
Originally Posted by Sushi Boy
Front:
.20 spring
10 deg of reactive
max caster
-1 deg of camber
magenta pro cuts (1.70in)
3.5mm ride height

Rear:
Red center spring, blue if your track is a little more bumpy
AE 30wt oil
2 nylon wheel spacers under front of the center shock
1.5mm of droop (uptravel from the center)
low roll center
white side springs, with a little tiny bit of preload
blue CRC tube lube in the tubes
3.5mm ride height
Pink Pro Cuts (1.80in)
Protoform speed 12 body if traction is lower... parama speed 8 works awesome when traction comes up a little more.

I think thats everything...

-Korey
Thanks Corey, I will give that a shot this weekend and see how it works....
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Old 08-15-2006, 11:09 PM   #19933
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Quote:
Originally Posted by ml
Try these settings. Put throttle travel to maximum (150 on KO Propo Helios) and set brake to 100 on setup. Reduce push brake to 90-95% on the transmitter. Set Mode 1 = 2, Mode 2 = 3, Mode 3 (initial brake) = 2, Mode 4 (automatic brake) = 2 (medium). I used 23/98 with 1.84" Jaco two stage tires. Also try value 3 for modes 3 and 4, depending on your track size. The Nats track was flowing, so not much automatic brake was needed. You may also want to use thinner wire to the motor.


theisgroup, I believe P2 is using Mike lufaso's setup on the Sphere.
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Old 08-15-2006, 11:11 PM   #19934
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Quote:
Originally Posted by padailey
About a 1 1/2 months ago I bought a used YRX-12WE. Without all the gory details I have broken the chassis. I have emailed Yokomo to see about a replacement and no reply so far (about a week). My LHS hasn't been able to locate a chassis for me also. So here's the questions...

1) Anyone know where to get a replacement chassis?

2) If I can't find one what chassis can I replace it with? or should I just upgrade to some other kit?

Oh... I have only raced on carpet and will probably do so 99.9% of the time. Plan on running stock but have been running 19T because that is the only class til more racers start coming back in the fall/winter.

Thanks,

Paul
You are probably not going to find a chassis. There are some kits out there, but that's a lot to spend on a replacement chassis.
There are way better chassis than that for stock and 19t on carpet anyway. Top of the list IMO is the Speedmerchant Rev4, or the CRC Carpet Knife (not sure if the CRC is available as a conversion). If you prefer a t-bar then the PRC Quad 12 is a good way to go. There are a lot of choices, so start checking around.
What else is there? Rug Rat? is the BMI car available as a conversion?
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Old 08-16-2006, 04:15 AM   #19935
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OD,my kit is a conversion at this time.
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