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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 10-06-2008, 01:45 PM   #29431
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Originally Posted by chicagokenji View Post
Our local hobbyshop is making their indoor small scale track larger. It looks like we'd have a 55-60 foot long track but lane width on the straight looks like it might be at about 5 feet due to to columns. We raced Recoils and 1/18th last year when the track dimensions were smaller.

I've raced 1/12th scale but always on 1/10th scale sized tracks.

Would this new track be able to run 1/12th?

What's the dimensions of the smallest tracks you race 1/12th at?
I've ran 1/12th at a 60 by 40 track. It runs fine.
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Old 10-06-2008, 02:17 PM   #29432
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Originally Posted by chicagokenji View Post
Our local hobbyshop is making their indoor small scale track larger. It looks like we'd have a 55-60 foot long track but lane width on the straight looks like it might be at about 5 feet due to to columns. We raced Recoils and 1/18th last year when the track dimensions were smaller.

I've raced 1/12th scale but always on 1/10th scale sized tracks.

Would this new track be able to run 1/12th?

What's the dimensions of the smallest tracks you race 1/12th at?
The overall dimensions are fine...the lane width will be OK but I would prefer wider. At that small you'll probably want to limit the number of cars per heat to about 5.
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Old 10-06-2008, 02:23 PM   #29433
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Quote:
Originally Posted by chicagokenji View Post
Our local hobbyshop is making their indoor small scale track larger. It looks like we'd have a 55-60 foot long track but lane width on the straight looks like it might be at about 5 feet due to to columns. We raced Recoils and 1/18th last year when the track dimensions were smaller.

I've raced 1/12th scale but always on 1/10th scale sized tracks.

Would this new track be able to run 1/12th?

What's the dimensions of the smallest tracks you race 1/12th at?
chicagokenji we've been running 12th on a track with lane width at a 5ft max for the past 15 + years, currently we are all running either 5.5 or 6.5t motors so you'll find there will be plenty of room for your car, just put abit of neg expo on your steering.

Steve
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Old 10-06-2008, 02:25 PM   #29434
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The overall dimensions are fine...the lane width will be OK but I would prefer wider. At that small you'll probably want to limit the number of cars per heat to about 5.
Agree you don't want more than 5 unless your planning on having a demolition derby
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Old 10-06-2008, 07:23 PM   #29435
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I finally got my Bloody Knife back to rolling chassis status.





There are still a few bits and pieces I need to get, but they aren't a necessity right now. Beyond that, a new steering servo and ESC and I'm in business.
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Old 10-06-2008, 08:26 PM   #29436
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Quote:
Originally Posted by chicagokenji View Post
Our local hobbyshop is making their indoor small scale track larger. It looks like we'd have a 55-60 foot long track but lane width on the straight looks like it might be at about 5 feet due to to columns. We raced Recoils and 1/18th last year when the track dimensions were smaller.

I've raced 1/12th scale but always on 1/10th scale sized tracks.

Would this new track be able to run 1/12th?

What's the dimensions of the smallest tracks you race 1/12th at?
Our club track(s) are 40' wide by 65' long. We generally have a full-length straight. We run MOSTLY 10' lane widths to cater to the Touring Car crowd (and watch 'em struggle to keep 'em off the rails with those Interstate lane widths) though the odd chicane, etc, may be a bit narrower. For my own preferences I'd like to see us run 8'.

The Indoor Champs at Cleveland (at least last year) ran an 8' front straight and the rest of the track was actually narrower than that (6-7' iir).

The tightest track I've raced on? The Great Falls, MT club (a GREAT bunch of guys!!) run their track two rolls wide (24') by probably 40' long (maybe a bit less). They run 6' (for the most part) lane widths. THe action is tight and you really have to be patient to make clean passes, but it's always a GREAT time.

Scottrik
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Old 10-06-2008, 08:33 PM   #29437
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shoot...last years champs had 10' straightaway with 8 foot interior. It was a freeway with hardly any boards on track. first time in a while I saw more than 5 mod sedans finish a race?
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Old 10-07-2008, 04:15 AM   #29438
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Originally Posted by Sunshine86 View Post
I finally got my Bloody Knife back to rolling chassis status.





There are still a few bits and pieces I need to get, but they aren't a necessity right now. Beyond that, a new steering servo and ESC and I'm in business.
Nice car. Be careful with the rubber band as I have experienced it extremely warping or bowing the chassis.
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Old 10-07-2008, 02:21 PM   #29439
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what good quality all around servo are you guys running in your 12th scale?
I am putting a 12r5 together.
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Old 10-07-2008, 02:22 PM   #29440
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Originally Posted by Micro-Man View Post
what good quality all around servo are you guys running in your 12th scale?
I am putting a 12r5 together.

Do we have a place to race....
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Old 10-07-2008, 02:29 PM   #29441
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Originally Posted by Micro-Man View Post
what good quality all around servo are you guys running in your 12th scale?
I am putting a 12r5 together.
Jr 3650 and Futaba s9602 and s9650. I forget the KO numbers...
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Old 10-07-2008, 03:19 PM   #29442
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John....Not yet, haven't heard anything back from CRC. Setting up a 12th scale for the carpet season this year....I need some 4 cell packs, got any yet? I need them for this weekend at Mimi's.

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Old 10-07-2008, 03:34 PM   #29443
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Jr 3650 and Futaba s9602 and s9650. I forget the KO numbers...
KO is the PDS949
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Old 10-07-2008, 05:40 PM   #29444
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However their is a updated version of the PDS949 servo called PDS-951 ICS and cost just abit more.
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Old 10-07-2008, 07:42 PM   #29445
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Default Stagger???

Just wanted to know how much is too much/too little.....what's the optimal stagger to run? Does stagger change depending on track layout/surface/grip level? I normally run a .10" difference but that's just what I've been told to do a few years ago. No one has ever given explanations on staggers' effect before, as far as I know......
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