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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 06-11-2009, 01:13 PM   #31576
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Quote:
Originally Posted by theisgroup View Post
... i hear OD might know a thing or 2 about that as well.


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Old 06-11-2009, 06:24 PM   #31577
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Glad to see you stopped using that blue surgical towel for your back drop, Show Off!!

Have you finished gluing my chassis yet? Stop messing around on the internet and get back to work, damn it!!!!
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Old 06-11-2009, 07:45 PM   #31578
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Hi guys, I have run a 5x cell, 50mAh , '1/4 A' RX pack for a long time now and it works great. I just wired up the cells and stuck the red futaba battery connector to the top of the steering servo to turn on and off just by plugging it in. I also use this connector to charge the pack also, really easy. It easily last a 8 minute run with about 18-25 mAh left after. I charge it up at .7amp and it peaks out after around 8 minutes. Just thought I'd put what I do on here, hopefully to help out. Cheers, Chris.
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Old 06-11-2009, 07:49 PM   #31579
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Hope the pic makes more sense!
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Old 06-11-2009, 10:37 PM   #31580
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Hey guys, I'm getting my 1/12th scale going again and was wondering what the "hot body" to run is. mostly running on asphalt but hope to find a carpet track somewhere close by.
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Old 06-12-2009, 07:28 AM   #31581
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Wingman, what car is that you posted a picture off, looks like it has a single tube rear damper?


I remember seeing a pic years ago of a 1/12th with microshocks instead of tube dampers, why dont more people run that setup? The microshock should be less maintenance than the tube and if you used it with springs you should be able to adjust the tweak on the car as well, no?
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Old 06-12-2009, 07:39 AM   #31582
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Hey guys, I'm getting my 1/12th scale going again and was wondering what the "hot body" to run is. mostly running on asphalt but hope to find a carpet track somewhere close by.
on carpet
speed 12
speed 8hd
blackarts
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Old 06-12-2009, 09:21 AM   #31583
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CRC/blackart 4167 - Audi R8C Lightweight 1/12th Racing body


http://www.teamcrc.com/crc/modules.p...prodID=7719024

Best eva!!
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Old 06-12-2009, 10:37 AM   #31584
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anywhere from 85mm to 95mm. it all depends on motor and speedo.

Ok-- So I have the car running. How do you know the car is over geared? (1s 13.5) Lets just say I am way above 95mm rollout and motor is hardly warm (125ish). I would say I could use a little more on the infield but the car tops out on the straight pretty quick. I am trying to find steering after about 2-3 min as the car goes into super push mode. It has good speed throughout the run though. I have not gone for a full 8 min yet (as far as I know, just practice right now.)

In offroad we gear up until the motor gets hot and this is about the most you can go. Not sure this is the right thing for these little guys.

steering help woud be appreciated as well. Gen X car with magenta fronts and grey rears. JTG sauce.
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Old 06-12-2009, 11:58 AM   #31585
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Originally Posted by Casper View Post
Ok-- So I have the car running. How do you know the car is over geared? (1s 13.5) Lets just say I am way above 95mm rollout and motor is hardly warm (125ish). I would say I could use a little more on the infield but the car tops out on the straight pretty quick. I am trying to find steering after about 2-3 min as the car goes into super push mode. It has good speed throughout the run though. I have not gone for a full 8 min yet (as far as I know, just practice right now.)

In offroad we gear up until the motor gets hot and this is about the most you can go. Not sure this is the right thing for these little guys.

steering help woud be appreciated as well. Gen X car with magenta fronts and grey rears. JTG sauce.
You can't gear based on temp in 1/12th 13.5 or 17.5 so much, and definitely not with a 1s LiPo. There just isn't enough battery voltage or weight to reliably get the motor up to the same temps as you would in Sedan or Off-Road.

Instead, gear your 1/12 1s LiPo car based on laptimes and feel, but while also checking the motor temps to make sure they are not out of line.
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Old 06-12-2009, 12:09 PM   #31586
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Quote:
Originally Posted by Casper View Post
Ok-- So I have the car running. How do you know the car is over geared? (1s 13.5) Lets just say I am way above 95mm rollout and motor is hardly warm (125ish). I would say I could use a little more on the infield but the car tops out on the straight pretty quick. I am trying to find steering after about 2-3 min as the car goes into super push mode. It has good speed throughout the run though. I have not gone for a full 8 min yet (as far as I know, just practice right now.)

In offroad we gear up until the motor gets hot and this is about the most you can go. Not sure this is the right thing for these little guys.

steering help woud be appreciated as well. Gen X car with magenta fronts and grey rears. JTG sauce.
What is your full car setup? If you can cure your push problem and get more cornerspeed throughout the run, the gearing problem will take care of itself because the car slows down less in the infield.
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Old 06-12-2009, 01:48 PM   #31587
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Basically kit setup with 10 deg caster, 3 shims back and .045 front springs, are the only things I have changed so far.

I need to check my center droop as I think that is off (too much). I am still kind of working the kinks.

ride hieght is 4.5 everywhere.

Things I want to change. Stiffer center shock (spring and damping) stiffer side springs, and lowering the front end .5mm.

Any other suggestions would be welcomed!
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Old 06-12-2009, 02:00 PM   #31588
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Basically kit setup with 10 deg caster, 3 shims back and .045 front springs, are the only things I have changed so far.

- I need to check my center droop as I think that is off (too much). I am still kind of working the kinks.
- ride hieght is 4.5 everywhere.
- Things I want to change. Stiffer center shock (spring and damping) stiffer side springs, and lowering the front end .5mm.
- Any other suggestions would be welcomed!
Casper - you running on Carpet?
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Old 06-12-2009, 02:06 PM   #31589
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Basically kit setup with 10 deg caster, 3 shims back and .045 front springs
Just trying to be helpful and keep others from being misinformed. The springs you refer to as .045 are actually .45mm, which is equal to an Associated type .018". spring.
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Last edited by kn7671; 06-12-2009 at 02:19 PM.
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Old 06-12-2009, 04:36 PM   #31590
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yes carpet. Sorry about the typo on the spring.
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