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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 03-19-2007, 03:43 AM   #24256
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Quote:
Originally Posted by GUNNA
Well i have to say after running 1/12 at the states here in Perth Australia this weekend, i never want to go back to TC. A lot of fun and very fast.....
excellent
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Old 03-19-2007, 11:40 AM   #24257
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Any old school 1/12 scalers, remember what your target rollout was for the Midnight 2 stock?

I had a brand new one sitting in my box and I am going to use it in my pan car.

we are running on ozalite carpet. 12L3 - pretty much stock.. I have been told 47.. that sound about right for this motor?

James
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Old 03-19-2007, 03:12 PM   #24258
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Quote:
Originally Posted by wallyedmonds
excellent
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Old 03-19-2007, 03:41 PM   #24259
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I raced 1/10 carpet direct drive and gearbox dirt oval for about twelve years and then took four or five years off and just got back in. I am running 1/10 oval and 1/12 road course.

Yesterday I raced 1/12 at CRC raceway, home of the carpet knife and gen x. I noticed that the pro stock drivers (still running stock motors, just faster drivers) seem to drive their cars right into the corner, blip the throttle and are right back in it.

I on the other hand am using the approach I used to use in dirt oval, roll off the throttle into the corner, coast through the center, roll into the throttle off the corner, while sweeping into the corner.

I have my throttle trim set one or two clicks back from where the car starts to roll. Should I be running more brake? I noticed that the fastest stock driver had a lot more brake trimmed into his car when he let off the throttle than I do. I have also noticed that if I pick up the throttle a little too early that the car starts to push and think having the added dead band of the brake dialed in might help their too.

It seems like the things that made me fast on dirt are slowing me down in 1/12.

Last edited by haagar; 03-19-2007 at 03:53 PM.
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Old 03-19-2007, 04:23 PM   #24260
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It sounds like your driving it much like a modified, on how you are rolling the throttle. Stock is very quick, hold the throttle, blip and go.
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Old 03-19-2007, 04:27 PM   #24261
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Staying out of the throttle that much will kill our corner speed. There's not enough hp there to unsettle the car so throttle it like an on-off switch. Most stock guys set thier cars to roll at neutral to help carry speed into the corner
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Old 03-19-2007, 04:45 PM   #24262
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i agree with you OD.i set my car to roll at walking speed to keep the speed up through the corner.with that being said,i still dont fully lift even with the roll,i just lift to 1/2 throttle quickly for the car to set into the tight corners
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Old 03-19-2007, 05:42 PM   #24263
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i really had to adjust the way i lifted for corners. i came from stk touring and was used to lifting before the turn to get the car to transition and roll. with 12th ive had to change how i throttle through a corner. now i lift just enough to help the car rotate but even then that is less than a 1/5 lift of throttle. i have yet to set a roll into my car but i will try that this weekend.

thats what i like about this board. i learn something new everyday.

-Zac
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Old 03-19-2007, 06:25 PM   #24264
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Thanks for the tips. I'll give them a try tomorrow night.

The biggest thing I need now is laps. And more races. For some reason I can only seem to put together four minutes out of the race
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Old 03-19-2007, 07:18 PM   #24265
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i gotta say,i learn alot every time i get to run carpet.i mainly run asphalt and i run carpet 2-3 times a year.after learning alot from the rug,i find myself even running roll at neutral in 19 turn asphalt also.i figured that if i got my car to make the corners with roll in the throttle,it would be that much faster.when i finally got it,i was much faster.it forces you to have a good setup.if i drive my car with no roll now,the car is almost undrivable way too much steering. all this steering yet i only run 60% dual rate and i dont use it all unless i am in trouble
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Old 03-19-2007, 07:22 PM   #24266
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I set my car up with Roll, and if push comes to shove, I use it as a tuning aid. If the car is not steering enough going in, I take some of the roll out... if it is steering too much, put a little more in.... Fine tuning it...


BTW, Jason, did ya know Dave Duncan was running the DB12 this weekend... so you had a 1-2 with two differnt chassis...
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Old 03-19-2007, 07:24 PM   #24267
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Quote:
Originally Posted by protc3
i agree with you OD.i set my car to roll at walking speed to keep the speed up through the corner.with that being said,i still dont fully lift even with the roll,i just lift to 1/2 throttle quickly for the car to set into the tight corners
How do set it for mod
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Old 03-19-2007, 07:29 PM   #24268
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Quote:
Originally Posted by TimPotter
I set my car up with Roll, and if push comes to shove, I use it as a tuning aid. If the car is not steering enough going in, I take some of the roll out... if it is steering too much, put a little more in.... Fine tuning it...


BTW, Jason, did ya know Dave Duncan was running the DB12 this weekend... so you had a 1-2 with two differnt chassis...

yeah,that was pretty awesome tim. you ran awesome. by the way guys,Tim Potter won our state race with his new DB12R this past weekend.he was fast as hell all weekend but just couldnt get in a good run but man o man did he put it together for the main.
Dave duncan was real fast and consistant all weekend.that man had all clean runs and the results reflected that in every round and the main.way to wheel it guys putting BMI 1 and 2 in an extremely tight,competitive field.it was cool to be in races with all fast guys.
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Old 03-19-2007, 07:32 PM   #24269
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Quote:
Originally Posted by arr see car
How do set it for mod
no roll for mod.mod motors coast real good with very little drag and also have an ass load of HP which is going to make it harder to get into the corners.mod is all about smoothe.it is my favorite of all the 1/12th classes because it really forces you to be smoothe.
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Old 03-19-2007, 07:40 PM   #24270
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I also run no roll for mod. The weight of the arm and the less drag help with it in the corners. Definitely a fun class to run. I only practice with 12th mod, nobody else has the sac around here...
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