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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 12-22-2012, 02:35 PM   #38836
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Originally Posted by Matthew Bailey View Post
So I am planning to get back into 1/12th. The last car that I ran in that class was a 12L3. Since I will be running at CRC, I will buy one of their cars since set-up help will be plentiful for it. What classes are popular for 1/12 there?

Also I run nitro buggy in the summer, any idea if the turn out is any good at the offroad track?
For 12th there is pro stock which is 17.5 blinkly and there is stock which is 21.5 blinkly..... there are only a couple of more weeks of running onroad thought, towards mid January we run indoor offroad till the spring then we go outdoors, there is a pretty good crowd for offroad. The most popular class being 2wd sct..... there is also always a nitro buggy crowd
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Old 12-22-2012, 10:19 PM   #38837
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In 17.5 you can drive around the whole track and never lift. 21.5 must be really like paint drying, and a massive underutilization of what you bought.
Did you mean stock is 17.5 and super stock is 13.5?
Does it bother anybody else that 1/12 went faster with cells and silver cans than it does today with a 21.5? Really... how slow is slow enough?
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Old 12-23-2012, 02:53 AM   #38838
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I remember running 1/12 on six cells with stock motors. Granted the cells were only 2000 mah and if you were rich you ran 3000 panasonics, but they were a lot faster than even 17.5 with a single LiPo.
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Old 12-23-2012, 02:57 AM   #38839
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I remember when 1/12th was what you graduated to when you got really good in another class. It was kind of an expert only class. I think that is what killed it. It was just too hard to drive for a beginner. By reducing voltage, the cars got a lot easier to drive for a beginner, and that makes it a lot more attractive especially since it is cheaper to run than TC.
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Old 12-23-2012, 07:25 AM   #38840
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I'm returning to 1/12 after taking about 16yrs off from racing. I mostly ran 27t stock with 1700 4-cell sanyos back in the mid 90's and going to 17.5t blinky is a step back in terms of performance. Don't get me wrong I love the idea of virtually no motor maintenance and batteries (lipos) with competitive performance without constant matching and paying $$$ but the US really needs to consider higher performance motors for 'stock'. In Europe the 10.5T blinky class is the lower 'stock' class together with full mod. When it's all said and done we have $600-800 tied up in a 1/12 car and the only item that really wears more when using higher watt motors are the tires. A set of tires are $20???. I don't really get it. Back in the day you had to have connections to get the good mod motors and batteries and there was a ton more maintenance than stock. Is is no longer the case. I would love to follow the Europeans lead and make stock=10.5T and mod=open. If the concern is speed go watch a YouTube video of 10.5T, it's equivalent to a v.mild brushed mod motor (19T) which I can assure you is a ton more fun to drive than 17.5T and you will have punch out of a corner and have to lift.

Rant over.....

Jon.
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Old 12-23-2012, 09:43 AM   #38841
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I believe your memories of how fast 1/12th scale was in the 90's may be a little off. Those cars have gotten faster in your memories over the years. We need to remember that the chassis' are much better now and the battery capacity is two to three times higher. I remember never touching the throttle before the racing started. We geared our cars to the capability / capacity of our batteries not to the cars or the drivers ability. We all hoped that the car would go like hell for 8 minutes then dump right after the finish line.

The chassis' and tires today are so good that you can run flat out all the way around the track in 17.5 blinky. The old chassis' and tires couldn't hold. A big part of that is the reduction in weight with the lipo battery. If you can find some old race videos, you don't see a black groove like you do today.


Check out this 1/12th worlds video. These cars are 6 cell modified. I think a modern 17.5 blinky could scare them and boosted would beat them.

http://www.youtube.com/watch?v=rs94vDnc2TA

Sean Cochran commented on the "1992 IFMAR 1/12th WORLDS VIDEO thread. (02/09/2012)

A couple of things for everyone to consider regarding the speed.
1. The batteries then, if I remember correctly, were Panasonic P170s, 1700mah.
Most peoples Tx packs have more run-time than what was available then.
2. Most racers were probably running 18-20 turn motors.
3. There was no way in the World that normal people could get equipment comparable to what was run by those racers.
Now days everyone can buy the "best stuff" from any hobby shop and be competitive at the WCs. If they have the skill.
4. The cars were almost 200 grams heavier than what we have now.

After watching the 12th mod cars at Snowbirds I am convinced that 12th scale was much more rewarding "back in the day". The cars are so flipping fast and no one has to even think about dumping, the skill set required to run 12th is much different. Now you simply pull the trigger and hang on, emphasis on hang on! I'm not denying the talent that it takes to get a 12th car around now days but just stating it requires a different type of skill.

While I think lipo and brushless has made general RC racing much better for the masses it has also ruined some areas of racing, with 12th scale and possibly to some degree oval being less fun because of the endless run-time.

Also the type of back and forth action you can see in the video just isn't possible with the cars today due to the speed. It seems to me that today if you don't have a 2 foot "bubble" of free space around your car there is going to be a crash. Things are just happening too fast for even the "best reflexes in the business" to be able to keep up for an entire race distance.

I'm sure others will have differing opinions on this but I have watched and participated in 12th scale racing for 24 years, yes I'm getting really old, and just wanted to give some observations on what I have been seeing happen over the last few years. It just takes looking at old videos to really drive home the point.

I'm now going to go grab a fire extinguisher and wait.

Long live 12th scale.
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Old 12-23-2012, 10:04 AM   #38842
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I have been racing 1/12TH even longer than Jason, and I have to agree with his comments. The cars in that video may, and I say only MAY, have been faster for the first minute but that is all. Did you see them struggling to finish? At the very worst, after the 4 minute mark a 17.5 boosted car would start to eat them up, badly. A modern 1S mod can dump a 6000+ pack in 8 minutes. That is very serious power and would cream those cars. 17.5 blinky is bringing racers into the class because it is slow enough to be driveable. If you want to go faster, pop a 3.5 in there and let her rip.
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Old 12-23-2012, 10:39 AM   #38843
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Originally Posted by LloydLoar View Post
Do you know of a method to get Mobgums for those of us who live in the US? I am having trouble finding a retailer who has a decent selection and will ship to the US, but I also haven't spent too much time looking...

I like trying out tires
Give Markus Mobers an E-mail (www.speedtechRC.DE). I think he will ship around everywhere. I really like them!

Quote:
Originally Posted by gti5notrkt View Post
I'm interested in giving the Mobgums a try. What compounds have you found that work well for med-high bite carpet in the lower power classes (13.5T/17.5T)?

Thanks,
Jon.
Jon I mostly drive 13,5T boosted, 10,5T blinky 10,5T boosted and Mod (4T), so I'm not quite sure. But, Magenta's all arround work really wel on mostly all the track I run, with all the classes. Also have a look at Yellow - Black, which is really good for stock blinky!
For high bite, you should look out for Pink all around.

Regards Robert
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Old 12-23-2012, 11:08 AM   #38844
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Originally Posted by RacinJ View Post
I believe your memories of how fast 1/12th scale was in the 90's may be a little off. Those cars have gotten faster in your memories over the years. We need to remember that the chassis' are much better now and the battery capacity is two to three times higher. I remember never touching the throttle before the racing started. We geared our cars to the capability / capacity of our batteries not to the cars or the drivers ability. We all hoped that the car would go like hell for 8 minutes then dump right after the finish line.

The chassis' and tires today are so good that you can run flat out all the way around the track in 17.5 blinky. The old chassis' and tires couldn't hold. A big part of that is the reduction in weight with the lipo battery. If you can find some old race videos, you don't see a black groove like you do today.


Check out this 1/12th worlds video. These cars are 6 cell modified. I think a modern 17.5 blinky could scare them and boosted would beat them.

http://www.youtube.com/watch?v=rs94vDnc2TA

Sean Cochran commented on the "1992 IFMAR 1/12th WORLDS VIDEO thread. (02/09/2012)

A couple of things for everyone to consider regarding the speed.
1. The batteries then, if I remember correctly, were Panasonic P170s, 1700mah.
Most peoples Tx packs have more run-time than what was available then.
2. Most racers were probably running 18-20 turn motors.
3. There was no way in the World that normal people could get equipment comparable to what was run by those racers.
Now days everyone can buy the "best stuff" from any hobby shop and be competitive at the WCs. If they have the skill.
4. The cars were almost 200 grams heavier than what we have now.

After watching the 12th mod cars at Snowbirds I am convinced that 12th scale was much more rewarding "back in the day". The cars are so flipping fast and no one has to even think about dumping, the skill set required to run 12th is much different. Now you simply pull the trigger and hang on, emphasis on hang on! I'm not denying the talent that it takes to get a 12th car around now days but just stating it requires a different type of skill.

While I think lipo and brushless has made general RC racing much better for the masses it has also ruined some areas of racing, with 12th scale and possibly to some degree oval being less fun because of the endless run-time.

Also the type of back and forth action you can see in the video just isn't possible with the cars today due to the speed. It seems to me that today if you don't have a 2 foot "bubble" of free space around your car there is going to be a crash. Things are just happening too fast for even the "best reflexes in the business" to be able to keep up for an entire race distance.

I'm sure others will have differing opinions on this but I have watched and participated in 12th scale racing for 24 years, yes I'm getting really old, and just wanted to give some observations on what I have been seeing happen over the last few years. It just takes looking at old videos to really drive home the point.

I'm now going to go grab a fire extinguisher and wait.

Long live 12th scale.
Dang and I left my flamethrower in my other suit, to be sure memories tend to remember more of what we want vs what really happened. I started in the mid 80's and at that time here you only had two choices, 12th or 1/8th gas. And those days were 1200 cells, not even as fast as todays 17.5 cars, the only things I really miss about the old days was the larger turnouts and the strategy that came into play to make run time. I guess thats why I liked boost so much, it brought back some of the mental part of racing.
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Old 12-23-2012, 12:01 PM   #38845
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Quote:
Originally Posted by Robert_K View Post
Give Markus Mobers an E-mail (www.speedtechRC.DE). I think he will ship around everywhere. I really like them!
Regards Robert
Do you know whether the foam on the mobgums is different from Jaco, or whether they are identical but with a grey rim? I notice some of the compounds are different (eg red), but I am wondering whether Markus renames an already existing Jaco compound or whether he actually puts different foam on dyed Jaco rims. Any ideas?
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Old 12-23-2012, 12:10 PM   #38846
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There is a reason the Europeans go with a 10.5 for stock class...their tracks are much bigger than tracks in the US so they can handle the power and the cars still seem slowish.
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Old 12-23-2012, 01:12 PM   #38847
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Quote:
Originally Posted by InspGadgt View Post
There is a reason the Europeans go with a 10.5 for stock class...their tracks are much bigger than tracks in the US so they can handle the power and the cars still seem slowish.
I agree that the US tracks are smaller in general, however due to the fact that nearly every 1/12 event is run is conjunction with USGT/touring car the tracks are way more open and flowing that ever were 10-15 yrs ago.

Jon
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Old 12-23-2012, 04:36 PM   #38848
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Quote:
Originally Posted by DesertRat View Post
In 17.5 you can drive around the whole track and never lift. 21.5 must be really like paint drying, and a massive underutilization of what you bought.
Did you mean stock is 17.5 and super stock is 13.5?
Does it bother anybody else that 1/12 went faster with cells and silver cans than it does today with a 21.5? Really... how slow is slow enough?
No that's what I meant.... 21.5 will teach you how to drive more than driving a faster car and smashing it...... its also a spec motor so its all driver..... And just to let you know frank Calandra and Brian Wynn them self's drove with 21.5's today
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Old 12-23-2012, 05:01 PM   #38849
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17.5 blinky is going faster at most tracks than we used to with 27t brushed and 4 cells. Cars, setups, adapting to oderless sauce have made the cars smoother and easier to drive than ever so they seem slower.

At the last snowbirds I went to 7 years ago I could drive my 27t car at full throttle for as many laps as I wanted. It's was terrible for my motor to do so and would lead to motor fade late in a run but I could do it.

The latest motors have made racing so close. I think its great. To win in Spec 1/12 (17.5 or 13.5) or WGT (13.5 or 10.5) you have to drive every lap perfectly, no crashes or blown corners and be able to pass and lap traffic cleanly. I love the challenge of racing today.
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Old 12-23-2012, 05:56 PM   #38850
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In the early days of 17.5 blinky, the cars felt terribly slow. Lap time wise they were actually ok but with those motors and batteries, they just had no punch so they felt slower than snot. Now motors and batts have improved so not only are the lap times quick but they have a fairly quick feel to them as well. Feels a lot like my brushed days when we ran procar (21t) motors. Still not quite as punchy and fast feeling as 19t racing (I LOVED 19t with 4600 4 cell), though 13.5 will get you there.
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