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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 08-15-2010, 05:59 PM   #34261
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Quote:
Originally Posted by nitrodude View Post
Yeah, its asphalt. Weather here today is beatiful! What I call perfect RC racing weather, sunny, not too hot, a little breeze, just nice. Except I have to work and they are having a big SCT race on the offroad track. It will be a few weeks before I get the electronics for the car, so when I get the car(hopefully by wednesday) Ill take it appart and go tru it. I jusr realized I've never built a ball diff before either.

Whats a good speedo and 17.5 motor? Ive been reading up a bit and the speedo I would buy not knowing much is the Tekin RS. I love the fact that its software is upgradeable and you can hook it up to the laptop and set it up. Opinions and advice?
In WA australia there is generally a base starting tire choice for asphalt, i myself dont tend to use much else.. purple fronts and pink rears.. setup wise i looked at a pro drivers sheet online as a starting point then talked with guys at the track if i needed further help. If i need more steering how to get it, or how do i raise the ride high at the front..
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Old 08-15-2010, 07:54 PM   #34262
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I run a 12R5.1 built exactly how the directions recomend then tune with tires and sauce. That was the advice I was given and it seems to work. I'm still pretty new to the 12th scale as well. As for the steering I just turn my expo way down. That works for me. Theres probably a a lot of guys with more experience then me so hopefully more will chime in so we can both get some tips.

Last sunday we had a pretty full heat.

Pretty much everyone is willing to answer questions and help out. You should check it out this coming Sunday the 22nd. Even if you dont race you can pick peoples brains.
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Old 08-15-2010, 10:34 PM   #34263
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Nitro, which kit are you going to use ?
J-Vet is giving you good advice for Camarillo.
R5.1 base settings and the right tires is a good setup most everywhere.
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Old 08-15-2010, 10:57 PM   #34264
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As mentioned above if you are running asphalt it is best to start with soft rears like pinks. Then go a shore or two harder on the front but with higher rubber content tires like magenta or purple. I played around with the Exceed pro tires for a bit and they worked well with soft rear/med fronts or med rear/hard fronts. I recently changed to CRC's and they seem to provide better balance used the same way with pink rears/magenta fronts or magenta rears/purple fronts.

As for these cars having lots of steering thats not really the case. While I am new to 12th I have found that the problem is getting the power down out of a corner far more than into a corner (I can even lock the rears into a turn and not spin out!). Once you get that down you will be looking for more and more steering.
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Old 08-16-2010, 08:08 AM   #34265
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Hey all,

Having a small issue with my 12scale.

Running tekin RS with 17.5 tekin
Novak Booster
Reedy 1cell lipo.

I ran 10.5 and it ran fine, I switched to 17.5 and after about 3 minutes, speed decreased and motor became super hot.

I changed my tekin settings to what others were running and also changed my gearing accordingly.

I changed the Tekin and booster and even the motor same problem

Has anyone had this issue before, could my battery be faulty or maybe I missed something in the Tekin software?

thanks

s
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Old 08-16-2010, 09:58 AM   #34266
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Either too much timing, too much gear or both.
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Old 08-16-2010, 11:40 AM   #34267
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If you check the Tekin website--you can get a LOT of settings for different setups for your 1/12 car. I had nothing but trouble trying my car w/ 13.5 motor on 1S until I used some of the suggestions off the website. Now the car's ballistic---motor stays cool--and I can run 9 minutes no problem---so a little warm up time and an 8 minute race are a no-brainer!!
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Old 08-18-2010, 08:21 PM   #34268
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I am really trying to understand this 12 scale thing. Can anybody tell me the effects of the different bodies. ie more push, more steering, more speed, more downforce.Are some just for pavement and others for carpet etc.

List of bodies would be:

AMR 12
Speed 12
Speed 12b
EE1
Speed 8
Speed 8 HD
CRC Bomb er

I would also assume mounting the body forward or aft would make the same changes so would it be fair to say most bodies are mounted to center the front wheel and the rear wheel position would change with the wheelbase.
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Old 08-18-2010, 08:53 PM   #34269
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Quote:
Originally Posted by Cammer View Post
I am really trying to understand this 12 scale thing. Can anybody tell me the effects of the different bodies. ie more push, more steering, more speed, more downforce.Are some just for pavement and others for carpet etc.

List of bodies would be:

AMR 12
Speed 12
Speed 12b
EE1
Speed 8
Speed 8 HD
CRC Bomb er

I would also assume mounting the body forward or aft would make the same changes so would it be fair to say most bodies are mounted to center the front wheel and the rear wheel position would change with the wheelbase.
In my experience.
17.5 is so slow, that traction is not an issue
So i don't see the point in dragging a body with more downforce around the track than necessary, such as the, CRC Bomb er or the AMR 12
For Mod, or in situations where traction is low, more downforce makes sense.

At the ROAR On Road Nationals in practice, I drove an entire lap at Full Throttle with 17.5 boosted, just to see if it was possible.
It wasn't my fastest lap, but it was surprisingly easy to do

For Stock I like the Protoform Speed 12


and the BlackArt Audi
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Old 08-18-2010, 11:34 PM   #34270
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Quote:
Originally Posted by Cammer View Post
I am really trying to understand this 12 scale thing. Can anybody tell me the effects of the different bodies. ie more push, more steering, more speed, more downforce.Are some just for pavement and others for carpet etc.

List of bodies would be:

AMR 12
Speed 12
Speed 12b
EE1
Speed 8
Speed 8 HD
CRC Bomb er

I would also assume mounting the body forward or aft would make the same changes so would it be fair to say most bodies are mounted to center the front wheel and the rear wheel position would change with the wheelbase.
for mounting, i just try to place the front tires centered.

the AMR and Speed8HD have more rear downforce and less steering than the speed8EXP and CRC R8 (closedcockpit)

i havent' tried the EE1, or speed12's.

for spec motors on carpet i prefer the speed8EXP or R8. the extra downforce AMR or HD might be useful for mod carpet or maybe even stock on loose asphalt?

all things equal, on carpet i would 'prefer' to use a harder rear tire (2xpink vs yellow/grey) and a looser body as opposed to a highdownforce body that locks the rear end.

mind you the last race i ran an AMR body and yellow rears, because that was the best arrangement for me that day. another consideration might be durability, a lightweight Protoform equals a heavyweight Parma in terms of weight and durability. a lightweight Parma needs reinforcement to match my driving style.
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Old 08-19-2010, 11:39 AM   #34271
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2006 front end is in fashion again ?
This looks like the best A-arm design of the "new tech" so far.
Throw some pod links on this and you've got a sweet ride eh.
SP12X

http://www.corallyusa.com/sp12x.htm
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Old 08-19-2010, 12:11 PM   #34272
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Quote:
Originally Posted by RedBullFiXX View Post
2006 front end is in fashion again ?
This looks like the best A-arm design of the "new tech" so far.
Throw some pod links on this and you've got a sweet ride eh.
SP12X
http://www.corallyusa.com/sp12x.htm
There is no upper arm in that design though...the king pin is solidly fixed to the A arm so it will have a lot of camber change and no caster adjustment. Best A-arm design of the new tech in my mind is the new BMI front end
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Old 08-19-2010, 12:51 PM   #34273
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Quote:
Originally Posted by RedBullFiXX View Post
2006 front end is in fashion again ?
This looks like the best A-arm design of the "new tech" so far.
Throw some pod links on this and you've got a sweet ride eh.
SP12X

http://www.corallyusa.com/sp12x.htm
That was Corally's new car in 2006 and David Spachett won the worlds with a prototype of this car that had the 2006 Associated 1/12th front end which later became an option for the kit. The front end in the picture posted was the original front end which did not work well. They also offered a US version that had the standard 1/12th rear axle so other 1/12th wheels could be used as the original version could only use the old Schumacher wheels. These cars where updated and rebadged Schumacher cars.

1/12th community, correct me if I am wrong.
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Old 08-19-2010, 01:40 PM   #34274
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Sorry to correct you, but:

These cars are certainly not rebadged Schumacher cars.
They are genuine Corally cars from the Netherlands.

The original wheels look a bit like the old Schumacher ones, but they are
different.
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Old 08-19-2010, 02:12 PM   #34275
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Quote:
Originally Posted by Crashby View Post
That was Corally's new car in 2006 and David Spachett won the worlds with a prototype of this car that had the 2006 Associated 1/12th front end which later became an option for the kit. The front end in the picture posted was the original front end which did not work well. They also offered a US version that had the standard 1/12th rear axle so other 1/12th wheels could be used as the original version could only use the old Schumacher wheels. These cars where updated and rebadged Schumacher cars.

1/12th community, correct me if I am wrong.
It was never badged a Schumacher, but...

The Schumacher C car used that style of front suspension in 1984, the first time it was seen on a 12th car. It was a great car, and won the European Champs in 1985 and 1986 - over 20 years before Corally did the same thing in aluminium. And lets not forget that CEFX did the same thing with the C12 in 2004!

Corallys have always been Corallys, and they sold at their best when driven by one David Spashett, who won them their only two IFMAR WCs. David has retired now, and Corally sales seem to have retired with him! It is also worth pointing out that David was soundly beaten in the 2005 European Champs using that front end, but wiped the floor with everyone at the 2006 Worlds using the same car with an Associated front end - 'nuff said!! HTH
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