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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 06-04-2010, 03:58 PM   #33976
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Originally Posted by bjholz View Post
Here is my 1/12 cars so far. Almost ready to go! I have a CRC carpetknife and a BMI. Do you guys know anything about this BMI car I have??


It's a BMI SG1 12L conversion, developed by Wayne Gerber Jr. Pretty decent as far as T-Bar cars go. Dump the side shocks and get some damper tubes for it. Add a saddle LIPO and you'll have a pretty good car. Of course the CRC ride is at least as competitive, if not more so.
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Old 06-04-2010, 04:24 PM   #33977
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Where can I get the side tubes?
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Old 06-04-2010, 04:46 PM   #33978
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So can I just throw a brushless motor in my CRC and call it a day? Or do the brushless require a different rear end?
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Old 06-05-2010, 08:22 AM   #33979
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Actually, that is a conversion for the 12L4 that wayne and i worked on together. We started out as him coming to me with a design and then we worked together as i gained interest and it evolved from there. It was a T bar car and they are all very good. A 12L4 with this conversion was the highest quality car that money could buy at the time. All the manufacturers did make nice cars but this was a conversion with alot of cool features that other companies have followed. Dont be fooled by the age of the kit. You have an excellent car that will be easily top of the bunch with todays cars. I can sit here and try to sell you on the latest and greatest but i dont need to. You will really like the car.
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Old 06-05-2010, 08:29 AM   #33980
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What Jason said

A 12L4 is still a great and competitive car so that conversion should be at least as good.

The CRC car will probably work just fine the way it is but you can get a brushless pod for it. The only problem with that is that the Gen XL is so cheap, you're better off just getting the whole car

P.S. If you don't want to mess with the BMI car, I might be interested in taking it off your hands. I am a huge fan of the hole 12L series but I've never had any of the 12L conversions. It would be a nice piece for the collection and I might even race the thing.
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Old 06-05-2010, 10:38 AM   #33981
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Novak Ballistic 10.5

what's the standard timing on these motors?

what rollout for open indoor carpet track with Tekin esc

this is the venue

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 06-05-2010, 03:24 PM   #33982
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I am excited to race the BMI. So is that the concensus, is that I should remove the side shocks and put on damper tubes? Or did the conversion kit include those shocks?

Also, what brushless ESC's are you guys using for 1/12 racing? I had a GTB 4-cell but I fried it, so I was looking to scoop up another one.
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Old 06-05-2010, 04:18 PM   #33983
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Well if you use the side shocks you use those to adjust tweak and take the tweak screws out of the chassis. What is nice about that is you can change springs to change the roll characteristics of the rear pod. If you use damper tubes then you'll need to use the tweak screws and the pod roll spring rate is determined by the t-bar. Using the shocks will give you more adjustability but a higher CG.
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Old 06-06-2010, 02:13 AM   #33984
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Quote:
Originally Posted by radio_car_racer View Post
Novak Ballistic 10.5

what's the standard timing on these motors?

what rollout for open indoor carpet track with Tekin esc
Alex, see my reply in the RS thread.

Trev
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Old 06-17-2010, 07:07 PM   #33985
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Does anyone know if an Associated 12R5.1 front suspension will bolt on the XRAY XII? In other words, do the chassis holes line up??? Thanks.
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Old 06-17-2010, 07:13 PM   #33986
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Is anyone here truing their front tires to a set angle? If so, any benefits?
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Old 06-18-2010, 12:29 AM   #33987
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Quote:
Originally Posted by ElliotCanada View Post
Does anyone know if an Associated 12R5.1 front suspension will bolt on the XRAY XII? In other words, do the chassis holes line up??? Thanks.
The chassis holes are actually a different size, so no it won't. I've heard though that someone (can't remember who) makes different alloy blocks that makes it possible to fit on cars with the usual size holes.

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Old 06-18-2010, 01:36 AM   #33988
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Quote:
Originally Posted by ElliotCanada View Post
Does anyone know if an Associated 12R5.1 front suspension will bolt on the XRAY XII? In other words, do the chassis holes line up??? Thanks.
Quote:
Originally Posted by TrevCoult View Post
The chassis holes are actually a different size, so no it won't. I've heard though that someone (can't remember who) makes different alloy blocks that makes it possible to fit on cars with the usual size holes.

Trev
I think you guys are talking about the bulkheads that Hyperdrive makes, and they are available through lefthander-rc (.) com

These are the bulkheads needed to put a 12R5 front end on a 12L4 or CRC car.

Steve
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Old 06-18-2010, 10:55 AM   #33989
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Default Noval Ballastic rollouts

Plan to do the IIC in Vegas in 2010 Running 13.5 and 17.5 in 1/12th pan car. Ive no experience of these motors any advice on rollout.
Please PM me if you can help.
Thanks in advcance
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Old 06-18-2010, 11:45 AM   #33990
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Originally Posted by tellan View Post
Plan to do the IIC in Vegas in 2010 Running 13.5 and 17.5 in 1/12th pan car. Ive no experience of these motors any advice on rollout.
Please PM me if you can help.
Thanks in advcance
For 13.5 depends on the speedo. 60-85 ish roll
17.5 with no boost will be interesting, I'm guessing in the 90's maybe even high 90's

I'm thinking about these 2 classes as well.
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