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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 03-07-2005, 10:48 PM   #11746
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How is that flu O'D?
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Old 03-07-2005, 10:51 PM   #11747
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Quote:
Originally posted by JRX-S Bill
How is that flu O'D?
the flu's doin great, it's kickin' my ass.
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Old 03-07-2005, 10:56 PM   #11748
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Quote:
Originally posted by odpurple
the flu's doin great, it's kickin' my ass.
Sorry to hear that. Really wanted to show you my 12L4 car *before* the California Carpet Championships this coming weekend.

Just got all this IRS stuff to take advantage of everything I know.

Will test on Wednesday night at Stockton.
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Old 03-07-2005, 11:16 PM   #11749
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I may be out there for a visit wed night
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Old 03-07-2005, 11:18 PM   #11750
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Quote:
Originally posted by odpurple
I may be out there for a visit wed night
Only if you wear a surgical mask...he, he...
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Old 03-07-2005, 11:19 PM   #11751
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Od, can you post some pics of your cars. They are sexy
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Old 03-07-2005, 11:20 PM   #11752
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Quote:
Originally posted by tc3stocker
Od, can you post some pics of your cars. They are sexy
Especially, a 12L4 with the wiring routed looooow.
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Old 03-07-2005, 11:21 PM   #11753
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all of them, please, unless you don't want to

You should do a picture trail for all your cars. If you are interested send me all the pictures and I will make it.
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Old 03-08-2005, 12:15 AM   #11754
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Quote:
Originally posted by tc3stocker
all of them, please, unless you don't want to

You should do a picture trail for all your cars. If you are interested send me all the pictures and I will make it.
Most of the cars worth viewing have already been posted. Cars from my Museum are mostly older spec cars. I'll post new builds as they are completed, if you like.

I don't know what a picture trail is, but if you want to do one, I'll send you photos. PM me or whatever.

Thanks for your interest, guys. Since I'm not a fast driver, I get my jollies from building, so it's fun to share how I put them together.

Bill-
I'm actually working on my first 12L4. I'll post pictures when it's done (with the the looww wiring).

O'D
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Old 03-08-2005, 01:30 AM   #11755
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Quote:
Originally posted by picco007
Fire,

JRX-S Bill is correct. There are many things that can make a 12th scale car feel tweaked. First you need to make sure that your tires are the same diameter from side to side. Also it would be a good thing to check ride height at this point too. Second, you need to make sure that your car is in a race mode, meaning the batteries and all race equipment that should be in the car is in the car.

In a 12 th scale car, you should feel even more if there is a tweak in the car. Being that it is small, it's less stabile in my opinion. I hope this helps....
Also...make sure the Diff isn't too loose, as an unloading Diff will send the car to the left on acceleration.
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Old 03-08-2005, 07:35 AM   #11756
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Quote:
Originally posted by Soviet
Also...make sure the Diff isn't too loose, as an unloading Diff will send the car to the left on acceleration.
Speaking of diffs again, another thing I learned from the 12th scale gurus at the track is to add endplay on the diffs. I laterally tighted the diffs too much by slamming the hubs to the axle plates too close. I never lasted the whole race. I'm running new batts btw.
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Old 03-08-2005, 07:42 AM   #11757
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so you wanna leave a lil play when you put the clamp on?

also how loose is too loose?
cause i certainly noticed my car pulling left when i nail it, but if i dont just hammer it, im fine

i only tighten the thing enough to where when i grab the tires i cant turn the spur
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Old 03-08-2005, 07:56 AM   #11758
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Quote:
Originally posted by primusblowsgoat
so you wanna leave a lil play when you put the clamp on?
Yes, but mine is only a few thousandths of play. Some others have several thousandths; but, that seems excessive to me.

Quote:
also how loose is too loose? cause i certainly noticed my car pulling left when i nail it, but if i dont just hammer it, im fine
Not sure if you are asking about endplay or the diff here. Think I answered the endplay above and diff below.

Quote:
i only tighten the thing enough to where when i grab the tires i cant turn the spur
Exactly. I have recently installed 1/8" IRS ceramic balls in the spur and a Slapmaster bearing outside the right hub to make my diff really smooth.

Bill
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Last edited by JRX-S Bill; 03-08-2005 at 08:02 AM.
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Old 03-08-2005, 12:14 PM   #11759
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Im picking up a second hand L3 to try some 12th scale, do most of the L4 parts carry over as spares for the kit. Or are spares going to be a problem?
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Old 03-08-2005, 12:17 PM   #11760
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they will work on the 12l3. spares will not be a problem
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