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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 04-13-2007, 05:47 PM   #24901
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let me tell you a short story,i to this day have no explination for this.i got a bunch of 767 brushes about 7 months ago that really sucked.i left them in my box and have not used them since.i went to running 4499's that i had and they were good.then i went to a good batch of F's and they were a little better.then 2 weeks ago just for the hell of it i decided to try those crumby 767's again.let me tell you,they were off the charts.hands down the fastest my motors have ever been.my only guess is that they may have shelf hardened over time but when i say they were better,it is drastic.before,they would draw 5 amps at 2 volts at 6000 RPM in a KD.normally i would throw that motot out.2 weeks ago,that same batch made my motor draw 10 amps at 10000 RPM.i geared the piss out of it and my god,the fastest 19 turn i have ever had in my 1/12th.sorry for the rant,i just found this amuzing.

i have run xxx brushes and i ran them for a while.they work very well.i change up sometimes just to try different combos.i have a ton of them though and i plan to run them again soon.i believe i still have about 150 pairs left
i will be trying some different cuts and spring combos in them to see what i can accomplish with them.they do work well though
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Old 04-13-2007, 06:14 PM   #24902
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Quote:
Originally Posted by fast-ho-cars
i got a chance to test drive anothers racers Darkside 1/12th car on carpet and the feel is sort of hard to descirbe. it is definitely different than any t-bar or link car i have ever driven. the car felt very planted and steered like the car was a 4wd sedan. he is running Parma 38 PU-F and PK-R's on it in stock class, he tried grays on the rear but due to the pack adding weight forward he said the car would lose complete rear traction at 6 min mark no matter what he did. don't know if he tried black or grey fronts? the car for him has been a improvement since he has only broke into the 50+ lap barrier with it. 2-3 lap increase for him. this racer had no experience with 12th scale and was used to driving sedans. he also own a 12l4 and CRC 6-pack.
With the Darkside Mx2 I run purple fronts and double pink rears for stock on carpet. Last carpet race I ran the front at 171mm wide and rear at 167mm wide. That made the car handle buildup of front traction at the 6 minute mark. Sometimes I also run the front ride height .25mm higher than the rear. I'm going to try the .022 front springs next time out on our indoor asphalt track. We have alot of traction. I was running 19T yesterday evening. Track size is 96 x 48. I tuned the KD with 4499's green/green and rolled out at 1.77
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Old 04-13-2007, 06:19 PM   #24903
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Quote:
Originally Posted by CarlosG.
Jason and OD, have you tried running the XXX brushes in the motor? I was wondering what they would do as far as power-wise. I know that the ICE would trip when I tried to break it in at 2v with red springs +/-.
I ran them for a while back when I was running Reedy motors for 19t. The motors seemed fast enough, but the claims I heard of them lasting forever didn't materialize. They lasted about like anything else I had used up to that point. I thought they were a little hard on the com, which I would not care about if they made a faster motor, but they didn't. I've never used them on a KD and should probably try them again.

P2 told me he was going to try some this weekend, ask him what he thinks.

Jason, can I send you some brushes to cure in your magic storage box?
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Old 04-13-2007, 06:28 PM   #24904
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Quote:
Originally Posted by SRW141
With the Darkside Mx2 I run purple fronts and double pink rears for stock on carpet. Last carpet race I ran the front at 171mm wide and rear at 167mm wide. That made the car handle buildup of front traction at the 6 minute mark. Sometimes I also run the front ride height .25mm higher than the rear. I'm going to try the .022 front springs next time out on our indoor asphalt track. We have alot of traction. I was running 19T yesterday evening. Track size is 96 x 48. I tuned the KD with 4499's green/green and rolled out at 1.77

this may sound insane but try the KD w/ 767,red/red and roll out at a 2.05.try to run smoothe with the throttle because this made my car extremely fast down the straight and my smoother driving helped me make up .4 for fast lap and .2 on average.
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Old 04-13-2007, 06:29 PM   #24905
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Originally Posted by odpurple

Jason, can I send you some brushes to cure in your magic storage box?


friggin wierd right?
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Old 04-13-2007, 06:33 PM   #24906
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the xxx brush does beat down the comm pretty bad when i run too light of spring.they seem to like a slight bit heavier spring.i too,like OD said,found them to last as long as standard brushes.from what i heard some keep running them without serrations but still cut there comms as usual.i just like to see serrations so i chuck em when they are gone.
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Old 04-13-2007, 06:35 PM   #24907
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I'm only a few minutes from jason house so i'm going there to steal some of those brushes
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Old 04-13-2007, 06:39 PM   #24908
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I don't expect the brushes last more than usual. I just care about having power at my fingers readilt available. I expect to cut the comm like I usually do about every 2 to 3 runs. Well, I will see what happens tomarrow. I wiil give you all feedback on how it ran.
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Old 04-13-2007, 06:55 PM   #24909
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Quote:
Originally Posted by 20 SMOKE
I'm only a few minutes from jason house so i'm going there to steal some of those brushes
top fuel beotch
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Old 04-13-2007, 06:56 PM   #24910
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Quote:
Originally Posted by CarlosG.
I don't expect the brushes last more than usual. I just care about having power at my fingers readilt available. I expect to cut the comm like I usually do about every 2 to 3 runs. Well, I will see what happens tomarrow. I wiil give you all feedback on how it ran.

they should run good bro.try the red/red like you were going to and maybe a purple/red.they seem to like the heavier spring.you should be able to gear it a little higher to because they run a little cooler.
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Old 04-13-2007, 07:42 PM   #24911
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Quote:
Originally Posted by CarlosG.
I don't expect the brushes last more than usual. I just care about having power at my fingers readilt available. I expect to cut the comm like I usually do about every 2 to 3 runs. Well, I will see what happens tomarrow. I wiil give you all feedback on how it ran.
Whateva B-mainer... I will come down there and make your backyard mine, beotch!
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Old 04-13-2007, 08:19 PM   #24912
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You tried to last time you were down here. You didn't do it. You broke, then packed up. I was still running.
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Old 04-13-2007, 08:22 PM   #24913
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I will be there soon with extra radio gear, extra everything chump... I will own you!
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Old 04-13-2007, 08:25 PM   #24914
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Quote:
Originally Posted by odpurple
i finally found the time to finish a project I've been working on since last year. It's a hybrid car with a BMI motor box and OD12 front chassis. Jason sent me a top plate along with the motor plates so I could get the spacing right. I decided to use his top plate and made a one-off bottom plate to hook the two ends up. The BMI graphite has a nice satin finish, and my stuff is the usual shiny cf, so I wet sanded the OD12 parts to get a matching finish on the whole car. I sanded the parts surfaces after sealing the edges with ca so it has a really nice look to the edge. I'm really happy with the way this one turned out

Oh that's it. You told me my red conversion was going to be slow and you even have red clips?
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Old 04-13-2007, 08:30 PM   #24915
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Quote:
Originally Posted by David Galdo
I will be there soon with extra radio gear, extra everything chump... I will own you!
Thats fine, but none of this stock crap. If I am going to loose to you, I want to go fast. Full out mod...
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