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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 12-28-2003, 07:06 PM   #5851
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Yes, I am running the switchblade 12 spashett edition. I will definitely shoe goo it, thanks to everyone who has helped.
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Old 12-28-2003, 07:06 PM   #5852
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Sorry that I never talked about the servo mounting, I have no clue, lol. I have never tried it and it has been posted before on this and other threads. Old style all the way baby! lol

Snowbirds is the only race I cant do this year. I am doing the Jam, Scotty's USTC race, the nats (paved and carpet), possibly the worlds warm up, and thats about it pretty much for the carpet season/ early summer at this point, lol.

As far as the servo's defently need a mini servo for 12th scale. It will throw off the weight balance and I do not know if you could fit a larger servo.
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Old 12-28-2003, 07:17 PM   #5853
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Carpet Nats. should be a real blast this year. I can't wait for this snow to melt so I can start testing for the Worlds in Oct.
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Old 12-28-2003, 09:25 PM   #5854
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Ok guys,I have a serious 12th scale obsession now.I need help with gearing/rollout for both a Monster stock and a Binary for carpet on a medium sized track that is a real mix of speed.High speed sweepers with semi tight infield.

By the way the Speedmerchant Rev3 rocks.

Also,while I am asking what tires are you all running?I ran Jaco purples and white and the car was very agressive.Whats the smallest you can run your tires down to without performance degredation? I have the lowered rear pods and the carpet is not really bump but not marble smooth either.Any help is greatly appreciated.
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Old 12-28-2003, 10:16 PM   #5855
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Hi guys,

Just got myself a new Hyperdrive HK-1000. I'm having a small problem with my front axles, and I'm wondering if anyone had any suggestions. It seems like they're a hair too short. When I put my wheels on and secure them with the E-clip, they bind just a bit because the E-clip is rubbing on the outer bearing ever so slightly. Anyone had this problem before? (My car has the AE Dynamic front-end) Thanks for the help.
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Old 12-29-2003, 07:41 AM   #5856
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racenut- Glad to hear it! No clue on the rollout, sorry, however if its really better to undergearthe binary than overgear. If you even go one tooth over its a dog everywhere, even the straight.

Recently I have been messing with tires and found that TRC cyan fronts and granite rears are dialed for my track. Here is the rest of my set up, and this is for low-mid traction carpet (3 year old ozite put down right on hard cold concrete, lol) For a Rev. 3
Front end (old style)
-2 degrees of castor
-Camber shim
-.020 front springs
-Cyan's with half front sauce

Rear:
-12lb rear spring very little preload
-low roll center cones
-batts in back
-blue side's with a little bit of preload
-granites full sauce
-and the ballstud on the antenna/shock mount is raised up like .2 of an inch

Parma Speed 8 body

The car has alot of steering and is really easy to drive, and has nice corner speed as well.

Tire sizes... if you are running below a 3mm ride height with the #4 spacer with the lowered bulkheads, defently scrap the tires. In the front, I run the old school front end so you cant run em to the rim.
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Old 12-29-2003, 08:11 AM   #5857
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Quote:
Originally posted by KilRuf
Yeah, I double checked in my pit box. The Yok bearings are flanged. I'm set!! Now I just gotta prep up the car again for next weekend. Hope to get the new rear axle by mid week along with the tires. I guess I gotta grind off alittle on the pod to make full use of the TRC rears.

TRC wheels have a different offset than the JACO wheels. I suggest you set up with the TRC wheels to the maximum track width (6.75 inches) and center it to the chassis before you cut anything.
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Old 12-29-2003, 08:15 AM   #5858
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Default Re: steering servo

Quote:
Originally posted by rcmike
In airtronics,do you have to use a micro case 145? or can you use a 737 full size servo for the steering of a 12L3?? THANKS

The Airtronics 94145 is the servo to use in 1/12 scale. The other servo is a little big and does not have the dynamic performance of the 145. Good luck.
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Old 12-29-2003, 08:22 AM   #5859
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Quote:
Originally posted by skibum989
Hi guys,

Just got myself a new Hyperdrive HK-1000. I'm having a small problem with my front axles, and I'm wondering if anyone had any suggestions. It seems like they're a hair too short. When I put my wheels on and secure them with the E-clip, they bind just a bit because the E-clip is rubbing on the outer bearing ever so slightly. Anyone had this problem before? (My car has the AE Dynamic front-end) Thanks for the help.

how thick of a shim do you have on the axle? I had to pull the stock axle spacer off and re shim the front end to run trc tires
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Old 12-29-2003, 09:13 AM   #5860
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I'm using a Futaba 9601 servo on my 12L3, i think its not enough to handle the car at high speds, any recomendations? or would I just use regular servo?
Lem
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Old 12-29-2003, 09:19 AM   #5861
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racetech123-

I haven't used a Binary yet, but for a monster stock try about 2-3 teeth lower than a green machine. It has been awhile, but I think at TCHR when it was in existence I'd run a 27-30 rollout. I can be wrong, though. Alzheimers is already settin' in and I'm not even thirty! It's OK, I can hide my own easter eggs!

stormperson-Are you the Stormer of Stormer Hobbies? Just wondering...
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Old 12-29-2003, 09:55 AM   #5862
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dave s- no, lol. Its a bad SN i know, however when I used to play Rainbow Six online it kinda stuck, and so since I would forget different SN's, i kinda kept using it... LOL
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Old 12-29-2003, 12:19 PM   #5863
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anyone know where to buy the RugRat conversion, besides IRS, and Stormer Hobbis(they are out of the blue)

Thanks,
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Old 12-29-2003, 12:29 PM   #5864
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Here you go:

Towerhobbies, Only a few left I believe:

http://www2.towerhobbies.com/cgi-bin...?&I=LXGAT0&P=0

Let me know if it works. HOpe this helps
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Old 12-29-2003, 12:52 PM   #5865
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Quote:
how thick of a shim do you have on the axle? I had to pull the stock axle spacer off and re shim the front end to run trc tires
Dave,

I'm running no shims, just bearing, wheel, bearing, e-clip, in that order. I'm using the new Jaco's on the white rims (If that means anything)
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