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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 01-23-2012, 01:09 AM   #37591
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Default Mini metal lathe for truing tires

A wile back I posted questions about this project. HarryLeach gave me some good info starting out, thanks Harry. Well I finally finished it and happy with the results. It took a ridiculous amount of time because of screw ups and all the different wheel sizes. It would of been way easier to buy a purpose built tire truing machine, but why miss out on the fun and frustration of diy. Heres the photos of the results.
Attached Thumbnails
1/12 forum-imag0114-large-.jpg   1/12 forum-imag0115-large-.jpg   1/12 forum-imag0117-large-.jpg   1/12 forum-imag0118-large-.jpg  
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Old 01-23-2012, 04:34 AM   #37592
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Pete awesome job!!!
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Old 01-25-2012, 09:16 AM   #37593
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Does anyone make 'upgraded' rear ride height spacers for the CRC GenXL?

I have broken two of them in three weeks by sliding sideways into the boards.

One of my fellow racers has some red ones that are made of a different material, but they were given to him, and he has no idea who makes them or where to get them.

Thanks
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Old 01-25-2012, 09:48 AM   #37594
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Quote:
Originally Posted by luckyhomes View Post
A wile back I posted questions about this project. HarryLeach gave me some good info starting out, thanks Harry. Well I finally finished it and happy with the results. It took a ridiculous amount of time because of screw ups and all the different wheel sizes. It would of been way easier to buy a purpose built tire truing machine, but why miss out on the fun and frustration of diy. Heres the photos of the results.
That's the most over built tire truer I've ever seen.

Glad I could give you some help.

On your saw blade holder, you might get a smoother cut, and less chance of chunking the foam off the wheel if it were angled 30-45 degrees off vertical, makes the foam cut profile more of an angle, and will let you get tires down to size in fewer passes.
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Old 01-25-2012, 10:10 AM   #37595
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Okay, I found a Silva and an Encore (Bladder) shock from Stormer Hobbies.

Guess I'll have to do a shock build-off for dummies once they all come in.

Thanks again for all the recommendations. Jim
I had a chance to build both the Silva and Encore shocks. Both shocks are great but here's what I like best about each.

The Encore shock uses a threaded shock shaft instead of the typical lower spring keeper with a set screw. In addition, they offer an adapter allowing you to use the standard size ball cup. I also like the semi-clear bladder which makes it easy to see air bubbles.

The Silva shock threaded ends already accept the standard size ball cups.

Both shocks were easy to build/bleed and both are very smooth. I look forward to testing both and now changing shock oil as a tuning option will no longer be a pain in the rear. Thanks everyone for your suggestions...

Jim
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Old 01-25-2012, 11:22 AM   #37596
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Quote:
Originally Posted by ebruce View Post
Does anyone make 'upgraded' rear ride height spacers for the CRC GenXL?

I have broken two of them in three weeks by sliding sideways into the boards.

One of my fellow racers has some red ones that are made of a different material, but they were given to him, and he has no idea who makes them or where to get them.

Thanks
IRS makes some good ones with .5mm adjustments
http://teamirsrc.com/index.php?main_...0mo4jl4qr1j0k5

xenon makes like .25mm ones but cost a bit more if you can find them

http://xenon.ocnk.net/product/414
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Old 01-25-2012, 04:31 PM   #37597
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The CRC ones are the best I have found. The IRS ones are more brittle IMHO. The HB ones are made of a higher rubber content plastic and have .25 increments, but I like the way the CRC ones fit better and have a larger selection. Best bet would be a Team Tamale/Speedmerchant rear pop that eliminates the pill all together. Plus the larger bearings are super beefy and free.
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Old 01-25-2012, 04:53 PM   #37598
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I have yet to break a ride height adapter and have had side impacts hard enough to blow out the bearing. I've been using the IRS ones now for at least 4 of my last 1/12th cars and my WGT cars.

I saw the Team Tamale pod at the IIC and was pretty impressed with it. Unfortunately they don't make it for my BMI car But BMI has their own new pod in the works that uses spacers similar to the TOP car.
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Old 01-29-2012, 08:56 PM   #37599
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Which brand tires are most of you using? CRC,Xceed,Jaco,Contact. I'm pretty new to 1/12 and the tires that came with my car are pretty beat. Just curious what most guys are running.
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Old 01-29-2012, 09:00 PM   #37600
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Which brand tires are most of you using? CRC,Xceed,Jaco,Contact. I'm pretty new to 1/12 and the tires that came with my car are pretty beat. Just curious what most guys are running.
CRC, BSR, or Jaco/Parma are the tires of choice at virtually every track I go to.
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Old 01-29-2012, 09:03 PM   #37601
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CRC, BSR, or Jaco/Parma are the tires of choice at virtually every track I go to.
How are the CRC's with the larger rim?
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Old 01-29-2012, 09:15 PM   #37602
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How are the CRC's with the larger rim?
They're excellent. The wheels are light, stiff, and extremely true.
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Old 01-29-2012, 09:22 PM   #37603
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Quote:
Originally Posted by elex300 View Post
How are the CRC's with the larger rim?
Quote:
Originally Posted by CypressMidWest View Post
They're excellent. The wheels are light, stiff, and extremely true.
However, they are brittle. If you crash a lot, be aware of this. The offset of the rear rims are different from Parma/Jaco, so if you switch between them, you need to change the amount of axle shims to maintain legal width.
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Old 01-29-2012, 09:49 PM   #37604
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new to 1/12 and Im using Jaco tires. Ive recently purchased HUD102374 Arbor. Will this arbor fit front and rear Jaco tires? Or do I need another arbor?
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Old 01-29-2012, 09:52 PM   #37605
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new to 1/12 and Im using Jaco tires. Ive recently purchased HUD102374 Arbor. Will this arbor fit front and rear Jaco tires? Or do I need another arbor?
Yes, it will fit.


However, this is a better choice. If fits just about everything one the market today.

http://teamcrc.com/crc/modules.php?n...prodID=7719061
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