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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 01-11-2013, 02:34 PM   #39061
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How much roll out do you have in 10.5 blinky?

I would like to start with about 62mm roll out but have no idea what gearing I could use to achieve this
http://www.rctech.net/forum/11656705-post58.html


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It's getting much clearer for the body choice, the BA004 - Bomb R sounds like the perfect body for 10.5 blinky but I'm wondering if it's as smooth to drive compared to a BA005 or AMR12. A body that provides massive downforce can also loose it more violently in slower sections, no? Doesn't the downforce make the car less predictable?
Get both!

The BlackArt bodies are thin and will need to be reinforced if you want them to last, so having 2 is a good idea. Besides that, you can use the body as a tuning aid a lot of 12th racers do The R8c and the Bomb'R should cover you ok.
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Old 01-11-2013, 02:46 PM   #39062
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That helped a lot, thanks. I just discovered this site too http://www.gearchart.com/index.cfm?f...n=chart.create

How much runtime do you typically get from a 10.5 blinky with let's say a 6400mah 1s lipo?
You could run for a LONG time but that would not be good for your batteries. I never practice for longer than the length of a race. 6min for WGT and 8min for 1/12. I set a timer on my radio to ensure I pull off in time. The less you take out of a lipo pack the longer a battery will live and perform at a high level.

If I am practicing I run for a race length.

If I am making setup changes I drive 1-2min, note my lap times, make a change, run 1-2 min, note the change in lap times, make a change, run 1-2 min, note the change in lap times and so on for a few cycles then recharge or swap batts and let the motor cool.
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Old 01-11-2013, 03:05 PM   #39063
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http://www.rctech.net/forum/11656705-post58.html




Get both!

The BlackArt bodies are thin and will need to be reinforced if you want them to last, so having 2 is a good idea. Besides that, you can use the body as a tuning aid – a lot of 12th racers do – The R8c and the Bomb'R should cover you ok.
I'm laughing at myself for being such a noob beginning a new class . I almost forgot how great it is to discover so many things in such a short period of time, so thanks all for your patience. Nobody is running pan cars in my club so without you guys it would be MUCH more complicated.

From what I read Parma makes the thickest/ heaviest bodies then comes Protoform and Blackart.

Do you think a 10.5 is the best start for this track?
https://www.youtube.com/watch?v=6d4A7e1w9Xc

I'm not a beginner but I like to do things correctly from the beginning and not choose something too fast or slow. Right now I try to determine a good starting point of motor/ gearing/ tires and body. Considering everything is related to the other I'll have to fix a variable to begin with, maybe the motor. I'm a smooth driver and typically like progressive cars.
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Old 01-11-2013, 03:12 PM   #39064
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Parma makes their bodies in both a heavy weight and a light weight. The heavy weight ones are very thick.

As for a 10.5...well that all depends how good of a driver you are. 10.5 in a 1/12th is really fast so it may be a bit much. That track looks really tight and small so I would think a 17.5 would be ideal for that track...maybe a 13.5 but that could be pushing it.
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Old 01-11-2013, 03:21 PM   #39065
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Parma makes their bodies in both a heavy weight and a light weight. The heavy weight ones are very thick.

As for a 10.5...well that all depends how good of a driver you are. 10.5 in a 1/12th is really fast so it may be a bit much. That track looks really tight and small so I would think a 17.5 would be ideal for that track...maybe a 13.5 but that could be pushing it.
Touring cars on this track use 17.5T in 2S.

Here is a vid of me driving a cougar sv a year ago (when I just began this class):
https://www.youtube.com/watch?v=paUy93I-990

and here in 1/8:
https://www.youtube.com/watch?v=u-mcoYRamyg

maybe it will help to estimate my level in driving

The thing is I already own 10.5 motors from 1/10 offroad racing (LRP X11) but if it's too much I'll go for something smaller.
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Old 01-11-2013, 03:29 PM   #39066
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For 10,5T I think the new Mohawk Body of black-art is the 'one to get'. I've tested this body many times back to back, and at the twisty track of Mach Heemstede, or the High Grip, flowing Sipotech or Schermbeck track's it's just fastest. It's also the body with the highest down force, of all in the list ;-)

Regards Robert
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Old 01-11-2013, 03:52 PM   #39067
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1/12th is just a bit over half the weight of a TC and with the foam tires have more grip so even with half the voltage it should turn the same if not faster lap times with a 17.5 than the TCs.

Arg 1/8th nitro...I'm still trying to figure mine out after more than a year! LOL
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Old 01-11-2013, 04:02 PM   #39068
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1/12th is just a bit over half the weight of a TC and with the foam tires have more grip so even with half the voltage it should turn the same if not faster lap times with a 17.5 than the TCs.

Arg 1/8th nitro...I'm still trying to figure mine out after more than a year! LOL
I'm buying nitros and convert them in electric . The buggy you see in the 2nd vid is one of the first electric JQ (racing it since two years), the official electric JQ isn't out yet. In Belgium there is no more nitro championship in 1/8 buggy because electric has grown so fast.

Good to know for the motor, to me the TC from the vid are a bit slow. I actually drove one. Is there anyway I could tame the 10.5 or it will be overkill?
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Old 01-11-2013, 04:08 PM   #39069
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@_Pulse: Ok, you're from the UK, so either 17.5 blinky, or 10.5 blinky. I generally think 10.5 blinky is ok for someone who is average at say Stock TC. That track is on the tighter side though, compared to what I'm used to. Now, you say that no one else at your track runs pan cars. Well then, I suggest you pick whatever is most likely to get them racing with you. Generally that is the slower of two options. But also think about what the typical ability level is at your track, and who you might like to race against, who is most likely to join you, etc.
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Old 01-11-2013, 04:16 PM   #39070
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@_Pulse: Ok, you're from the UK, so either 17.5 blinky, or 10.5 blinky. I generally think 10.5 blinky is ok for someone who is average at say Stock TC. That track is on the tighter side though, compared to what I'm used to. Now, you say that no one else at your track runs pan cars. Well then, I suggest you pick whatever is most likely to get them racing with you. Generally that is the slower of two options. But also think about what the typical ability level is at your track, and who you might like to race against, who is most likely to join you, etc.
Bruxelles is in Belgium, not UK

My girlfriend will be driving with me, we have been racing together since we started rc. We just were in this club for once and people are very friendly. Most of them use 4wd TC in 17.5, but I'm not so sure it will be safe to race them with the 1/12 scale on such a small track or is it? The track is open all the week and I can get the keys so we already know we will have to drive alone quite often. It's a small facility with only two club evenings per week. This said I'm quite convincing so I've no doubt other guys will soon start to drive 1/12 too. The same happened when we started to convert our nitro cars to electric, we were alone too and some drivers soon started to do the same Funny to see electric is now dominant, it only took two years.
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Old 01-11-2013, 04:36 PM   #39071
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Bruxelles is in Belgium, not UK

My girlfriend will be driving with me, we have been racing together since we started rc. We just were in this club for once and people are very friendly. Most of them use 4wd TC in 17.5, but I'm not so sure it will be safe to race them with the 1/12 scale on such a small track or is it? The track is open all the week and I can get the keys so we already know we will have to drive alone quite often. It's a small facility with only two club evenings per week. This said I'm quite convincing so I've no doubt other guys will soon start to drive 1/12 too. The same happened when we started to convert our nitro cars to electric, we were alone too and some drivers soon started to do the same Funny to see electric is now dominant, it only took two years.
I read Buxton! :facepalm but the same thing applies to the rest of Europe.

A small club runs twice a week!? My club races onroad once a month!

I've raced with TCs, it's not ideal, if the drivers are polite you can get away with it but wouldn't want to do it regularly, F1s are better because they are more careful being open wheeled cars.
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Old 01-11-2013, 04:37 PM   #39072
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Bruxelles is in Belgium, not UK

My girlfriend will be driving with me, we have been racing together since we started rc. We just were in this club for once and people are very friendly. Most of them use 4wd TC in 17.5, but I'm not so sure it will be safe to race them with the 1/12 scale on such a small track or is it? The track is open all the week and I can get the keys so we already know we will have to drive alone quite often. It's a small facility with only two club evenings per week. This said I'm quite convincing so I've no doubt other guys will soon start to drive 1/12 too. The same happened when we started to convert our nitro cars to electric, we were alone too and some drivers soon started to do the same Funny to see electric is now dominant, it only took two years.
If the grip is decent at that little track of yours
17.5 TC's will be in the way if you're running 13.5 or more motor in 12th scale
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Old 01-11-2013, 05:09 PM   #39073
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Personally I really like 13.5 blinky for 1/12th...not too slow...not too fast. Last time I tried 10.5 was back in the 4 cell NiMh and boosted days and the car was scarey fast. 10.5 blinky might be fun...I wouldn't mind trying except for we run on asphalt and tire wear is fast enough already with 13.5.
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Old 01-11-2013, 05:20 PM   #39074
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When I said two times per week I meant there are two sessions open to everybody and members can come all the week. There is a small challenge for TC only in 17.5. One race per month.

It's quite cold inside so the grip isn't high, but we will need to be faster anyway so that everybody moves to 1/12 . Look at the track, it's meant for 1/12!
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Old 01-12-2013, 10:08 AM   #39075
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This is what I ended with:

Setup 1:

12R5.2
HW 1S ESC
Futaba 9650
GM 10.5 motor
RX451 receiver
BA005 body

Setup 2:

CRC XTi
HW 1S ESC
Futaba 9650
LRP X11 10.5
RX451 receiver
body?

Lipos: 4x Orion 6400 90C, 1x SMC 6000, 1xCRC 5400
Tires: 6 complete sets of magenta front, pink rear and once they're worn out I'll see
Radios: M11X

Is everything ok? Just need to decide for the gearing now and I should be good to go. Everything was bought used but in like new condition. Took me 3 weeks to find everything but now I'm done
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