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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 10-11-2003, 10:56 AM   #4351
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The Rev 3 has adjustable battery position, the Rev. 2 does not, that's really the only difference.
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Old 10-11-2003, 08:42 PM   #4352
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Default Truer Question

I wasa cutting some TRC tires tonight on the track's truer, using their arbor. I beleive it is an OFNA, the arbor has one small stud sticking out, and you put the wheel over that and screw it on tight. It did the fronts fine, but it didnt make the rears true. It is obvious when you spin the wheel that its not true. Is there a good reason for that, like the OFNA arbor doesnt work with TRC tires, or did I do something wrong?
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Old 10-12-2003, 07:06 AM   #4353
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Cypress,
what handling charecteristics have you noticed when changing oil in the center shock,
at the TRACK in Md. I built it up with 70 and put the copper spring on, this helped settle down the reare end over the bumps,

have you ever tried to go lighter with the oil ?

Casey
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Old 10-12-2003, 09:55 AM   #4354
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Default Re: T-bar Shimming

Quote:
Originally posted by jcrouse
I'm new to all this RC stuff, especially 1/12th scale. I have the above mentioned car. Periodocally I see someone mention shimming the T-bar, usually the front. It's even listed on the setup sheets on Associated's web site. Could some explain this phenomon to me. What is does and what to sue for shims.


Would someone take a shot at answering this racers question? I was wondering the same thing too!!!! Thanks!!!
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Old 10-12-2003, 10:00 AM   #4355
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RC Paperboy: there is some issues with the 12th scale Ofna arbor....

I have been trying to contact them for some time....

Not the best tech support.....
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Old 10-12-2003, 11:30 AM   #4356
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Just got back from LV Hobby Visions and look at the new 12th from Trinity and the car look great just can not wait to see it run and it come BLUE.
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Old 10-12-2003, 11:48 AM   #4357
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Quote:
Originally posted by Tres
RC Paperboy: there is some issues with the 12th scale Ofna arbor....

I have been trying to contact them for some time....

Not the best tech support.....
Ok, thanks. Ill try emailing them too, and see what I can come up with.
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Old 10-12-2003, 04:03 PM   #4358
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When I ordered my Jaco foam tires a while ago, I got the old style rear ones. And now the centerbead is coming apart. But I do have a couple chunks in the set of tires anyway. I need to get some lowered rear pods so I can run the smaller rear tires on my car. That will help bring my lap times up.

The new trinity car does look cool. I hope they make a version thats not blue graphite though, I personally don't like it. The silver graphite that yokomo makes looks cool. But the blue just looks wierd to me. Although I don't think I will buy the new trinity car because its make by trinity. I sometimes have a problem doing that .
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Old 10-12-2003, 06:55 PM   #4359
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Default SHIM under Front T-bar pivot

i used to add one AE aluminum washer under the front pivot when i raced a 12L years ago on asphalt. this causes a preload of the fiberglass t-bar. it enabled me to run a really soft shock set-up to set the car suspension really soft. especially helped in keeping the chassis from hitting when the power was hammered down.

6-cell car at the time
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Old 10-12-2003, 06:57 PM   #4360
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I am just taking a shot at this but I think adding the shim under the front pivot ball on the T-bar is like adding anti squat to the car. It makes the car turn in better (reducing rear side bite in the rear) and more traction coming out of the turn. I hope this is correct.
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Old 10-12-2003, 08:54 PM   #4361
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Default T-Bar

Whats a T-Bar do........and why the hell do you need a big hunk of fiberglass in the center of your car????

SpeedMerchant
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Old 10-13-2003, 05:30 AM   #4362
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Hey Casey,

I have been running losi 40wt with a black spring lately. It works well.

Are you going to South Shore this weekend. I have a slot car race in L.I. again and will be racing some R/C also.

Hey Ian,

You missed some great racing sunday. Too bad you could not make it. I TQed 1/12 and Mo won. I drove like a bone head in the main and wrecked myself a couple times. Mo was fast as usual. See you next week.

Paul
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Old 10-13-2003, 06:57 AM   #4363
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Quote:
Originally posted by chicky03
Hey Casey,

I have been running losi 40wt with a black spring lately. It works well.

Are you going to South Shore this weekend. I have a slot car race in L.I. again and will be racing some R/C also.

Hey Ian,

You missed some great racing sunday. Too bad you could not make it. I TQed 1/12 and Mo won. I drove like a bone head in the main and wrecked myself a couple times. Mo was fast as usual. See you next week.

Paul
Yeah, talked to Mo on the way home from Cinci last night. You guys put it on Blackstock, that's pretty cool. Mo said you were dialled. I think we'll be up next weekend, but it looks like you're gonna be outta town, but that's good for me I guess because it's one less guy to outqualify me! LOL. Good Luck at the slot car event!!!
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Old 10-13-2003, 07:11 AM   #4364
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Quote:
Originally posted by Casey
Cypress,
what handling charecteristics have you noticed when changing oil in the center shock,
at the TRACK in Md. I built it up with 70 and put the copper spring on, this helped settle down the reare end over the bumps,

have you ever tried to go lighter with the oil ?

Casey
The lighter oil helps over sharp little bumps in the rug, but makes the rear suspension slightly more "reactive" in that the weight can and will transfer more quickly fore and for aft. If the track is ripply, (lots of small bumps closely spaced) I'll go to a lighter oil to help it recover more quickly, but I generally stay in the 70-100 wt. range.
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Old 10-13-2003, 07:12 AM   #4365
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Default Re: T-Bar

Quote:
Originally posted by Chrisgt2
Whats a T-Bar do........and why the hell do you need a big hunk of fiberglass in the center of your car????

SpeedMerchant
Preach that Gospel brother Chris!!!! AMEN!!!
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