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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 04-30-2004, 04:26 PM   #7711
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cool...
I can't wait to run this thing
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Old 04-30-2004, 04:29 PM   #7712
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go ahead and post the opinions. For me the main thing would be durability.
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Old 05-01-2004, 03:31 AM   #7713
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Default Speedworld

Does anyone in this thread run 1/12th scale at Speedworld a lot? If so what tire compound seems to work the best there?
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Old 05-01-2004, 11:16 AM   #7714
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Default Batt question...

i have a few older packs i used to run in my touring car, unmatched i can convert then to 4 cell, sanyo 3300's and 2400s if i was to run spec class, would they last 300 seconds???
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Old 05-01-2004, 11:18 AM   #7715
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They should last 5 min depending on your gearing and motor
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Old 05-01-2004, 02:22 PM   #7716
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Default Re: Speedworld

Quote:
Originally posted by Erik R.
Does anyone in this thread run 1/12th scale at Speedworld a lot? If so what tire compound seems to work the best there?
Mostly pink and purple might try white rear but mostly pink and purple
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Old 05-02-2004, 05:04 PM   #7717
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ok, how can I make a speedmerchant car work on Asphalt, I'm not interested in hearing people say that it can't be done, thats defeatist. I run a modified Rev3 but it's more like a Rev4 with my modifications.
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Old 05-02-2004, 08:07 PM   #7718
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Default JOHNB!!

Hey, you didn't make it to April Fools Classic. Oh well, there's always next year. I just got an L4 and raced it on Saturday. It was ducking fialed! I was comparing it to an L3 and they look very similar. I was spankin' everybody until the screw that holds my servo saver in came loose. Oh well, next week I'll lay the smack down. You guys are running 12th scale up there, that's cool. Is there a big race that includes 12th scale there, if so I might attend. Thats sounds like fun. Talk to you later!
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Old 05-02-2004, 09:29 PM   #7719
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Default Re: JOHNB!!

Quote:
Originally posted by therealdanimal
Hey, you didn't make it to April Fools Classic. Oh well, there's always next year. I just got an L4 and raced it on Saturday. It was ducking fialed! I was comparing it to an L3 and they look very similar. I was spankin' everybody until the screw that holds my servo saver in came loose. Oh well, next week I'll lay the smack down. You guys are running 12th scale up there, that's cool. Is there a big race that includes 12th scale there, if so I might attend. Thats sounds like fun. Talk to you later!
Hey, how are ya? Yes, we're running carpet in an old mall here. it's about half empty so they let our club run really cheap. The track is 100'x36'.
Where are you racing down there? Carpet or Asphalt?
Not sure if we'll have any trophy races, maybe we'll try to get one together. Are there many on racers down there that would like to come up here for an indoor carpet race.

take care
john
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Old 05-03-2004, 04:30 AM   #7720
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Quote:
Originally posted by crimson eagle
ok, how can I make a speedmerchant car work on Asphalt, I'm not interested in hearing people say that it can't be done, thats defeatist. I run a modified Rev3 but it's more like a Rev4 with my modifications.
Full-size soft tires in the back, pinks. Purples in the front. 5-6mm of ride height. Soften up the back a bit, maybe blues or orang. Maybe a red or silver shock spring, little lighter oil. You might want to try the newer style front end. I talked to bruce, he said that's all you really need to do.
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Old 05-03-2004, 05:06 AM   #7721
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eagle- are you running the rev. 4 or rev. 3 chassis plate? If you are running the 3, i would really suggest picking up the 4 (unless you cut the chassis yourself) since on asphault where you have alot of body roll, it will make the most difference going to a narrower chassis (it wont rub).

Spyderx's set up is pretty much what everyone runs on asphault, and the car is dialed on the blacktop, Mo almost won the paved nats last year, except a corner marshall had a run in with his car.
Defently run the old style front end, and to make it easer to drive you can add castor.
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Old 05-03-2004, 08:08 AM   #7722
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Thanks for your input, I'm running pinks and purples, good size. I think I had too firm a center spring (red) I have a softer one which I'll try. I was running the blue side springs I'm going to change to orange and see. I have modified and cut the chassis down rev4 ish. I'm running lots of ride hieght also.

What should my castor be? currently I cut my front old stlye blocks down with 2 degrees on. The new stlye front end, do you mean the V-force? or the associated thing? (never used it before).

I'm in Northern California, it's pretty hot and my Paragon is gone by the 4th minute. By this time, I'm pushing badly on my way into the corner and when I hit the throttle on the way out, it's spin out city, as far as I can tell, I have the worst of both worlds.

Any thoughts about damper juice?

Finally what about the low roll centre cones? even if they won't work can someone tell what they do, I know they come with the rev4 kit.

Thanks for your help guys, it's annoying to drive so badly, I'm pretty good on carpet and not happy being at the back of the grid.

Last edited by crimson eagle; 05-03-2004 at 11:39 AM.
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Old 05-03-2004, 11:24 AM   #7723
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Default Rev 4 on Asphalt

I currently use TRC Cyans in front with Pinks in the rear.

Blue center spring

I am running old-style blocks in the front with no castor or camber (and am getting even tire wear).

I am running Josh's CEFX body to minimize push.

I am not pushing badly but have to be very gentle on the acceleration out of the corners (if you are running mod make sure you aren't using a stock setting on your speedo). Since the rear goes out when not much forward speed, the body type won't help keep the rear planted.

I have ordered some TRC Platinums (softer than Pinks) for the rear. To go with such, I have ordered some TRC tans and also pinks to try in the front.
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Old 05-03-2004, 11:45 AM   #7724
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I had fun this weekend.. Ran my Rev 3 this weekend and it was on rails.. I was almost 2 full seconds faster this time than I was the last time I raced.

The best part was being alot more consistent than before also. I can't wait to practice some more as I think I can go a little faster with more wheel time.

I have a Rev 4 conversion sitting waiting to be installed... I wonder what that will do... ??

thanks for all the help guys!
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Old 05-03-2004, 11:52 AM   #7725
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Quote:
Originally posted by clinttredway
I had fun this weekend.. Ran my Rev 3 this weekend and it was on rails.. I was almost 2 full seconds faster this time than I was the last time I raced.

The best part was being alot more consistent than before also. I can't wait to practice some more as I think I can go a little faster with more wheel time.

I have a Rev 4 conversion sitting waiting to be installed... I wonder what that will do... ??

thanks for all the help guys!
For stock-when you go to the rev4-try a heavier fluid in the dampers-that is assuming your around the Blue side spring weight.It handles different doe be prepared to make some changes. Its more consistent over the long run too.

Ray
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