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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 09-19-2003, 02:07 PM   #4021
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Default Batteries

I need to pick up some 3300 cells. Should I go with Sanyo or GP what are the pro's and Con's of both.

tia

Rob
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Old 09-19-2003, 02:11 PM   #4022
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romac the gp's have higher voltages than the sanyo plus we dont use them as much so the quantity is not there to get better packs so for now i'd say 99.9% of the racers here would agree with me and say go with the gp 3300 pluss they take a good beating almost comparable with the old 2000's we all ran.
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Old 09-19-2003, 03:30 PM   #4023
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Bob Z,
You might be driving to the track I can't make on Friday and I will be driving to the one you can't make on Sunday Both are top notch.

Accord,
CK on ashpault: Pink rears, purple fronts Hooked up like I couldn't believe. With the bigger track from the indoor carpet one I raced on, What a ball. Don't let anybody kid ya, try the CK on the black top, its great.

David Root
Getting ready for 1/12 season!
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Old 09-19-2003, 04:31 PM   #4024
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Default CRC CK

I agree with David Root!
To lower the roll center in the rear works incredible, take a look on the pic!
Attached Images
File Type: jpg ce12crchubertsusp.jpg (83.8 KB, 254 views)
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Old 09-19-2003, 05:25 PM   #4025
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backofner- The roll center is still pretty high in that picture it seems, although the car is very nicely polished .
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Old 09-19-2003, 07:11 PM   #4026
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CMW - That was the first run on a motor that was just taken out of the package and broken in. The springs were the stock springs that come on the motor and the brushes were Quasar (Reedy 766). And why don't you tell them how the car responded?

MikeD - I am away at the IFMAR 1.8 I.C. World Championships. I am one of the referees. It is very intense with a lot of pressure to make the right call. I will look at your extensive list of questions next week after I return home. I don't know if I can answer them all, but I can say the your car has a lower roll center than mine because the pivots on your t-bar are lower to the chassis than the stock REV3 mono-ball. Let's analyze this a little bit and see if there can be some apples to apples comparisons.
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Old 09-19-2003, 08:08 PM   #4027
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On my SpeedMerchant, when I ran the low roll center, the car had an extreme amount of rear bit.. it was like I could put enough steering into the car, I ran the stiffest center spring, but that made the car a little skittish on any thing but the smoothest tracks.
Now this is for me and my feel. I think for me it took some effieciency away from the car, made it feel like the car was just sucking up the batts. Now this is a very slight feel, but that last .1> or .2 secs makes a big difference.

I am just looking for the right balance, can you guys post your setups on the Rev3, springs ,front end type, castor, camber
and for the CK, and the 12l3
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Old 09-19-2003, 08:12 PM   #4028
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I remember when I ran the 12LC I shimmed up the T bar, to get the car to react quicker, therfore reducing rear bite.
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Old 09-19-2003, 09:01 PM   #4029
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DavidL- I saw a picture of you at the worlds, I was wondering what you were doing since I didnt see your name on the entry list.

On roll centers... In 4wd i am pretty sure that when you lower the roll center it takes away traction, because it keeps the chassis from rolling and transfering the weight in the corner, so the chassis stays flat. I would assume the same is true for 2wd (unlike castor...).
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Old 09-20-2003, 08:16 AM   #4030
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Talking QUAD 12

I'm with you speedxl the quality in workmanship is excellent, customer service is great! I'm still working on it however I'm sure handling will be phenominal (there is a couple guys locally running them and they are dialed!). Expect to see this chassis at the TOP of the roster sheet.
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Old 09-20-2003, 08:53 AM   #4031
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I picked up a 2nd hand Carpet Knife, it's in pretty good condition but one of the main axle bearings must have jammed because the axle is worn down and wobbles quite a lot. It definitely needs replacing but I'm also thinking of upgrading. It's got the standard 6 ball diff, can someone point me in the direction of an IRS axle/diff combo that would fit (part # if possible)?
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Old 09-20-2003, 09:01 AM   #4032
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Default RC4less.com

Best Prices and reasonable shipping. Great service.

No affiliation yadda yadda
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Old 09-20-2003, 09:12 AM   #4033
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thanks
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Old 09-21-2003, 05:57 PM   #4034
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you guys have a pic of this Quad car ?
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Old 09-21-2003, 06:03 PM   #4035
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Quote:
Originally posted by Casey
you guys have a pic of this Quad car ?
There are a couple pictures of the Quad12 on page 130 of the 1/12 forum. I'll post a picture of the car with wheels and a front end also.

D.P.
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