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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 11-22-2005, 08:16 PM   #15736
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Quote:
Originally Posted by _nick_
I run lowered and extended pods, and the "pro" diff, the dif just makes you car run smoother, and the lowered pod just let you run you tires longer, if you get extended and lowere it will help you turning alot.
ahh...so the lowered pod is actually farther off the ground so you can run smaller tires?
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Old 11-22-2005, 08:19 PM   #15737
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no, lower to the ground...
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Old 11-22-2005, 08:26 PM   #15738
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Quote:
Originally Posted by 12l4newb
thanks, so far I am very happy with the car. it reacts quickly and predictably to inputs. I just have been noticing everyone talking about the lowered pods and figured maybe that made the car even more stable.

I also read somewhere about replacing the diff with a thrust bearing which was suppose to be virtually maintenance free..anyone have experience with these. I believe it was from slapmaster. Which when you go to their website and dont even see a way to order their stuff.
The main thing lowered pods do is allow you to run smaller tires.

The Slapmaster thrust bearing is a redundant thrust which does not replace the diff. Since the outer right side bearing on the stock diff is used as the thrust it wears out rapidly (it's not really a thrust bearing). The Slapmaster unit doesn't wear out and the diff will stay smooth much longer as a result. I just use a regular thrust since the only difference is more maintanence.
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Old 11-22-2005, 08:34 PM   #15739
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i have ran the same berring in the diff for 2 years now, and have had no problem, my diff is still real smooth.
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Old 11-22-2005, 09:24 PM   #15740
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is the jr z3550 servo digital or analog?
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Old 11-22-2005, 09:33 PM   #15741
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The JR 3550 is analog. I've been happy with them--they seem to work well and are priced reasonably. I've got them in all three of my 1/12 racers.

Scottrik
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Old 11-22-2005, 09:37 PM   #15742
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Quote:
Originally Posted by TimPotter
I recently started running a mask I make , and it fits the 12th sized bodies great.... Tiger like....
That is sweet, you selling those masks?
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Old 11-22-2005, 09:43 PM   #15743
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Default Hitec HS225MG servo

Guys, I am not sure if this has been covered before.... I have the Hitec HS225MG mini servo and planned to use it in my 1/12th scale car..(M300SP).
Is this servo okay to use??

Another thing is, the gear ratio for 1/12. Is it calculated just by spur/pinion??

Thanks..
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Old 11-22-2005, 09:46 PM   #15744
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spir/pinion/tires....
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Old 11-22-2005, 09:54 PM   #15745
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Quote:
Originally Posted by Seano
That is sweet, you selling those masks?
Thanks Seano, you can get our masks at PDUB racing, and other shops.

http://www.pdubracing.com/products5.htm

BTW, sorry about the plug... back to 12ths
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Old 11-22-2005, 09:55 PM   #15746
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i had my airtronics94145 glued down on my t fource because the servo doesnt fit the mount (aluminum). what servo did team crc use as a layout for their kits? wasnt it jr? is the ko propo 949 a direct fit?
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Old 11-22-2005, 10:04 PM   #15747
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The servo is fine - I've used the same one for about 2 years.

Rather than using just gear ratio, roll out is a better measure of gearing when the tire diameter can vary. The calculation is like this:

Tire Diameter X 3.1416 (PI) X pinion / spur = roll out

Sample 1/12 rollout for a stock motor:

1.8" rear tire X 3.1416 X 30 tooth pinion / 96 tooth spur = 1.767 inches of travel per motor revolution.

I carry a calculator in my tool box just for this purpose. You could also use a spreadsheet to do a chart - maybe somebody can post one.
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Old 11-22-2005, 10:23 PM   #15748
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Quote:
Originally Posted by billdapart
I seem to remember reading about someone who was running a mamba brushless system for the micros in his 1/12 car. Does anybody know who that was? I've been searching but I haven't been able to find anything. Just got a 1/12 car and need to outfit it.. have extra mamba sitting around.. but don;t want to fry it.

thanks,
Bill
i am the MAMBA of castle creations and yes with our adapter plate you can run our 5800 system in any 12th scale. if you have any ? ypu can email me at rcteamboca@yahoo.com
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Old 11-22-2005, 10:33 PM   #15749
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The Three Wise Men are evil...

In only two weeks, I have purchased three new cars to build...RDX (thanks jrrc), Speedmerchant (thanks OD) and now the Yok 12WE (thanks Crashby).

Now have too much work to do...Posts may be sporadic for awhile.

Happy Thanksgiving all!
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Old 11-22-2005, 10:45 PM   #15750
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OD thanks for the info, Ive been out of the 12th scale loop for awhile and forgot some of the setup bit and pieces. Iam still running the L4 I trued the rears to 49 fronts 47 set ride height to 3.5 . There has been a pretty good turnout to last few Fri. nights,maybe 6-8 guys in stock. I will give this a try Fri. Thanx Big Bill
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