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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 04-19-2004, 06:22 AM   #7561
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Hahahahaha! And you are not tired at all I suppose...
Yeah, wish I had been there...
Wonder if I would have made the B?
Saw there was some discussion about motors... Weird that so many didn't have their stuff in order... Take care.
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Old 04-19-2004, 06:36 AM   #7562
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Guys, what kind of servos do you run in your 12th pan?
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Old 04-19-2004, 06:45 AM   #7563
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Airtronics 94145 or 94144 (old pre-'145)
And, yes they are strong enough.
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Old 04-19-2004, 07:02 AM   #7564
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Not to bad Mag

Go hear for all the timesfor the Euros 2004 1 to 12:

http://members.aon.at/speedfreaks/english/em/

Alf :-)
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Old 04-19-2004, 08:03 AM   #7565
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Hubert is runing Sanwa in his CRC

I 'm runing Fut 9650 Digital in my CRC

and Frank have JR i think, so we are all on difrent servos, and, Markus is runing Graupner, i think whas in his CRC, so mor or les all off are on difrents servos :-)

Alf :-)
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Old 04-19-2004, 08:22 AM   #7566
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Bit of advice when it comes to servos.
Many servos will not work perfectly direct from the box. Especially the ones with metal gears. They need some run-in before they will perform their best. I've seen people complaining about their brand new servos in this thread. Airplane modelers always (or they should at least..) run their brand new gear with a servotester for an hour or so, so they know they can rely on the equipment.
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Old 04-19-2004, 08:53 AM   #7567
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super steve i run the dynamic front end on my car for stock and 19t i dont like being confind to shims. i like full adjustabilaty.
people complain about the none consistancy of the dynamic front end.
look if you maintain it and check for wear and stress replace the parts as need be you'll never have a problem.

also i run an airtronics 91047 servo. I think thats the number? well i am sure someone will correct me!
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Old 04-19-2004, 09:46 AM   #7568
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Default T-FOurce

Hello,

I am building a T-Fource for a friend who has never run 12th scale before. I would like some input from you guys running this car on Carpet/foam tires (Hello MIke PUlfer, Calandras out there??).

Old school front end or re-active and servo flat or angled and any ackermann? Basically the whole servo/steering mounting for running at The Gate

Thanks,
Ray
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Old 04-19-2004, 11:06 AM   #7569
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stock I assume...

Ol'skool front end with servo flat would be the best for a newbie.
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Old 04-19-2004, 05:44 PM   #7570
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What do you guys think about HS5245? (the mini digital from hitec)
Cheap yet has good specs.

I've heard of hitec servos with centering problems.
Is this true for this servo?

Because i have experienced this with the smaller HS81MG mini servo on my M18
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Old 04-19-2004, 05:45 PM   #7571
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O, what is the difference between mouting servo flat to the chassis (shoo goo?) and those mounts that makes servo placed at an angle?
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Old 04-20-2004, 07:27 AM   #7572
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Default New car

This is a two new car from sweden. Itīs resently won the Swedish championship and ther was 5 of them in the top ten.
Take a look at it and let me know what you think about it.

http://www.laje.se/
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Old 04-20-2004, 07:34 AM   #7573
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I like the name "Corner thief"

Check out the way the caster is set up.

Looks good, can be in T bar or Monoball.
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Old 04-20-2004, 07:35 AM   #7574
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Default Re: New car

Quote:
Originally posted by Gezuz
This is a two new car from sweden. Itīs resently won the Swedish championship and ther was 5 of them in the top ten.
Take a look at it and let me know what you think about it.

http://www.laje.se/
That car looks pretty interesting to me... I am still waiting for the CEFX C12....
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Old 04-20-2004, 07:37 AM   #7575
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super steve spend the money get a futaba or airtronics, or ko servo the hitech servo have a bad failure rate. there are two guys here who have gone thru three a piece and after 2 days of racing barly touching anything they dont center.
also laying the servo flat makes the center of gravity lower and it feels smoother.
takes some of the edgyness out.
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