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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 11-04-2002, 04:48 PM   #1756
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Tigger.....Just wanted to let you know that you are no longer allowed to work on or even look at my car as its been worked on by the hands of the 12th scale GOD. The car was way better at Trackside on sunday then it was on saturday, must be because of the time Jucha put into the car....Thanks Brian aka "12th scale GOD". I had a good car all day never really got a clean run in all of qualifying b/c of my own mistakes. In the main I had a great run from 4th to 2nd but was too far back to catch Danny D. I say in 2 weeks we do battle at Trackside in Mod maybe Rob and or Brian will race mod too.....are you up to it?
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Old 11-04-2002, 07:50 PM   #1757
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Got to race this weekend(finally)our warmup race for the ROAR regionals....qualified 2nd.out of 6 ended up 2nd.....2nd. time to run my "Knife".......new GM3.....car was goood, but i think i was undergeared...I am geared 27/100.....49mm tire...for a 41.58 roll out...track is 48' by 60'......any thoughts?????undergeared?????
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Old 11-04-2002, 08:00 PM   #1758
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i think that you are undergeared, i usually run a gm3 at around a 48 rollout, but my track has a straight that is almost twice as long as yours. i still think that you are a little low. how did it feel, was there enough speed it probably had planty of low end being geared like that.
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Old 11-04-2002, 08:30 PM   #1759
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I think i'll go up a tooth or so......Let me ask you this.....are you full throttle down the straight every lap...or do you kinda hold back a bit, and use full throttle to pass (ie.)conserving battery????
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Old 11-04-2002, 08:41 PM   #1760
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conserve batteries? i almost forgot what that meant because of the 3000s and 3300s. nah, with stock i am full throttle all the way. mod i'll hold back a little bit but not too much, just cross the fingers and hope i don't dump.
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Old 11-04-2002, 09:55 PM   #1761
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litespeed- 3300's allow 8 minutes with 9 & 8 turns (25/104 and 23/104 gearing respectfully) if you're efficient so with a 10 or 11 turn you should be going 9-10 minutes on carpet i would think. Remember that dumping is a relative term. Someone like Blackstock may consider dumping to be the moment they start going .3/sec per lap slower than they were normally going and someone else may consider dumping when the car is at 50% of its normal speed.

Kev- Awesome, the plan is working... after spending all of that time not working on your car i figured the best way to keep it that way was to make you think Juch's would be the way to go. LOL! As far as running mod up at trackside do you guys want to do that this Sunday upcoming or in two weeks? How did RobK and Juch's do in 12th stock yesterday by the way? Will you be able to go to Venture this Friday and run practice? If so i could meet you up there i reckon and do some testing.
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Old 11-04-2002, 10:07 PM   #1762
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Tigger.....that was for a week from this comming sunday the 17th that I would be intrested in going to trackside to run some mod 12th scale. The plan is working huh...lol....I do want to thank you for the help too on saturday I would not have been anywhere saturday if it was not for your help....its just Jucha took it a step further then we both could have ever dreamed of. Rob qualified 2nd to Danny D and was in second for most of the race but I had a late run of the field from 4th all the way up to 2nd and passed Rob with 45 sec's to go. Jucha ran only Mod sedan he finnished a close second to Paulie....Danny D and Scotty took turns racing Jucha's car in 12th scale stock. Sorry I cant make it this friday I have to work but I will be there saturday and some of the Trackside guys will be there too.
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Old 11-05-2002, 01:25 AM   #1763
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hello,

Has anybody tried the oldstyle front end on the carpet knife??
Whats the ups and downs??

Tips and tricks for the carpet knife??

Why is it that the right rear side is wider than the left, i have tried to shim the left side out but the car becomes to wide then. Its the same all of our club members cars.
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Old 11-05-2002, 05:04 AM   #1764
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Ec1- the old style front is is generally better for carpet, and its not only lighter, but also more durable. the new style is better for asphault and surfaces with bumps and the like. like any 12th scale front end make sure to properly shim it, so that there is no undampened uptravel. also polish the kingpin.

as far as your rear width problem, are you measuring from the center line or the chassis? (since i am pretty sure the center of the pod is offset a little)
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Old 11-05-2002, 06:34 AM   #1765
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I have one of the old style front end, but havnt got the time to test it...i do race one carpet.

how does the old front en behave compared to the Dynamic one??


Idont like the dynamic one: lots of slop and play.

Are you using the 10 castor or the 0 one, diffrences??

I hasnt messured from the centerline, i put a line from the back wheels and compared the different measurment from the front wheels.
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Old 11-05-2002, 08:53 AM   #1766
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Ec1: check to verify the left side is not on backwards....

There was a post on here awhile back about that issue....
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Old 11-05-2002, 10:43 PM   #1767
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Kev= talked to Robk today we are planning as of now to go to Trackside this Sunday. i'm planning on coming out probably Fri and Sat to Venture as well. Regarding the car glad i could help some and i'm glad Juch's finished getting you hooked up (especially since we were in such a time crunch on Sat with you just getting the car and racing it that day). The fact that you're dialed is the major thing.... and also that now you're ready for some mod too, LOL!

Who's coming down from Trackside and do you think they will run any mod Sat at Venture?
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Old 11-06-2002, 12:18 AM   #1768
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tres,
Its not on backwards, if i flip it around itbecomes worse.
Its the same with all cars here 3-4.

Tried the old front eenb yesterday, i was more consistent under 8 minutes but i think the dynamic was faster one or two laps.
I feels like i have more low speed steering with the dynamic..
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Old 11-06-2002, 08:01 AM   #1769
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What do you guys think of the new Trinity Switchblade Spashett Edition 02. How does it compare to a carpet knife 3.1?
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Old 11-06-2002, 08:15 AM   #1770
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Ec1: drop an email to CRC Customer Service


www.teamcrc.com

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