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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 11-24-2005, 10:04 PM   #15826
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Bill........try RC4Less.com
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Old 11-24-2005, 10:08 PM   #15827
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Bill,

I'm told Murdock has the best prices. Whatever you do, let me know, I need some we can split the shipping.

Chris
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Old 11-24-2005, 10:12 PM   #15828
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Bill,

Check this out.

http://members.willinet.net/bmurdock...OBBY_SHOP.html

near the bottom of the page $3.50 each, great price.

Chris.
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Old 11-24-2005, 10:24 PM   #15829
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Quote:
Originally Posted by jrrc
Bill........try RC4Less.com
Betcha that Michael bought them out...
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Old 11-24-2005, 10:44 PM   #15830
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Quote:
Originally Posted by crimson eagle
Bill,

Check this out.

http://members.willinet.net/bmurdock...OBBY_SHOP.html

near the bottom of the page $3.50 each, great price.

Chris.
Looks like a winner. Actually, Murdock offers "Pan Car Ceramic Bearing Kits" that include 9 bearings and diff balls (all ceramic) for only $35/set.

Kewl!
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Old 11-25-2005, 12:18 AM   #15831
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Quote:
Originally Posted by Grub_Maker
OD or Crashby,

Where can I get thoes IRS rear ride height adj. The ones that go into the rear pod plates ??

Thanks .....
I buy them directly from IRS. You may find them at KT Hobbies or Stormer for less,though. Or you can do what Steve did and buy the Xenon ones from from Speedtech for a Kazzillion dollars (but they are smaller increments).
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Old 11-25-2005, 12:21 AM   #15832
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Quote:
Originally Posted by JRX-S Bill
Looks like a winner. Actually, Murdock offers "Pan Car Ceramic Bearing Kits" that include 9 bearings and diff balls (all ceramic) for only $35/set.

Kewl!
Wow! that's a good deal. I've been using Murdock tires for a while and they are the best. Jaco rubber on Yokomo rims-super!
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Old 11-25-2005, 06:18 AM   #15833
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Default Where is the Roll Centre on an Ass L4 Front End?

Hi All

http://www.rcracechat.com/vb/showthread.php?t=20120

Over on RC Race chat we are having a discussion on L4 front tyre diameters vs Roll Centre changes.

Anyone care to get us closer to the truth of it?

Cheers

Mark

Here is the starting point but there is more in the thread.


Thinking......

I know how to find the roll centre on a 1/10th touring car so I can picture the changes that top and bottom link angles make.

I have no idea how to "see" this on the front end of a 1/12th using the associated reactive (L4) type suspension on my CRC . Anyne care to enlighten me?

OK ... I guess it's is obvious where the RC is on the back ... its the rear pivot ball.... then it occurs to me....

As the rear tyres get smaller the rear RC does not change.

As the front tyres get smaller we take shims out of the whole suspension and lower the RC at the front?

So rear mechanical grip due to roll moment does not change at the rear but increases at the front as the tyres get smaller yes?

I like to keep with the same set of tyres through the day if they are working for me so understanding these changes I guess is more important than if you are rotating tyres to keep things more on the level.

Do people have any opinions on tyre diameters in general? In my second year of racing, I am tending to use smaller tyres because..... my tyres are smaller!

I am now using the IRS lowered associated arms so I can get more life out of my fronts also. Do others use these things? How small do you run your fronts?

Cheers

Mark
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Old 11-25-2005, 11:22 AM   #15834
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Thanks dsrbltoys. I found them on the site.
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Old 11-25-2005, 07:21 PM   #15835
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Default help

can someone give me a link to something on tunning a 1/12. like a download of a million papers telling mean how to setup a 1/12. something that can tell me what happens if i go to a stiffer spring, add more dope, thet kind of stuff.
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Old 11-25-2005, 07:38 PM   #15836
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Quote:
Originally Posted by ae_scott
can someone give me a link to something on tunning a 1/12. like a download of a million papers telling mean how to setup a 1/12. something that can tell me what happens if i go to a stiffer spring, add more dope, thet kind of stuff.
You can try Mike Lufaso's site:

http://home.sc.rr.com/mlufaso/rc/

He as listed the most info at one place than anyplace I know. Well, except maybe for this thread. If you still have questions after reading through all of Mike's stuff, post your question here. I am sure one of us will get an answer for you.
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Old 11-25-2005, 07:44 PM   #15837
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Quote:
Originally Posted by odpurple
Wow! that's a good deal. I've been using Murdock tires for a while and they are the best. Jaco rubber on Yokomo rims-super!
od,

I just checked the tires out on Murdock.

Do you know what the designations of "Standard", "Exotic" and "Natural" foam mean?

Bill

EDIT...MURDOCK HAS DISCONTINUED PREBUILT WHEELS/TIRES FOR 1/12TH.
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Last edited by JRX-S Bill; 11-26-2005 at 08:49 AM.
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Old 11-26-2005, 03:04 AM   #15838
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Quote:
Originally Posted by Crashby
You can try Mike Lufaso's site:

http://home.sc.rr.com/mlufaso/rc/

He as listed the most info at one place than anyplace I know. Well, except maybe for this thread. If you still have questions after reading through all of Mike's stuff, post your question here. I am sure one of us will get an answer for you.
shoot you did not show up at hobbyworld today. we had a B-main.
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Old 11-26-2005, 08:57 AM   #15839
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Quote:
Originally Posted by Taz_S
shoot you did not show up at hobbyworld today. we had a B-main.
No. Building a new car and did not get it finished in time. See you at Stockton next Saturday.
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Old 11-26-2005, 09:45 AM   #15840
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http://cgi.ebay.com/Yokomo-YRX-12-Wo...QQcmdZViewItem

This Yok YRX12-WE sale on eBay is closing out in a few more hours. Crashby pointed it out earlier; but, the deadline is near folks!
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