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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 12-15-2009, 01:56 PM   #32926
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we only run ground effects.
Yes !
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Old 12-15-2009, 01:58 PM   #32927
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Apex thanks for the reply. for some reason orange are really hard to find around here. I have one set of yellow left though i try and glue them, and maybe they'll last long enough till the orange one avail around here.
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Old 12-15-2009, 02:06 PM   #32928
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Can you explain this? I always thought rounding the tire helps preventing from chunking.
Rounding the edge provides more side bite causing more load on the rounded edge which in turn will chunk easier.
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Old 12-15-2009, 04:03 PM   #32929
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Rounding the edge provides more side bite causing more load on the rounded edge which in turn will chunk easier.
Thats not how i understand it. on a square tire, the tire edge will literally fold under as the tire changes shape under the lateral forces, and tear the side wall, and chunk. On a rounded tire, the contact patch on the sides is lesser, and doesnt necessarily provide side bite, it eliminates the square edge from rolling under (not the right way to say it, the car and tire will roll up onto the square edge alot easier) when the car rolls up on a rounded edge, its harder to tear the side wall as there is alot more foam support and rim support (hard to explain without a diagram) and you can actually get some grip flipping without chunking anything. This is as i understand it from touring, to 1/8th onroad. Ive done it literally for years and square edge tires always chunk way way easier than a nicely rounded tire. My 12th tires, i round right to the rim. I dont leave any square side wall and my cars have plenty of traction and hardly chunk.
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Old 12-15-2009, 04:25 PM   #32930
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I have an interesting delima since I just switched to bl/lipo this past weekend. I am running a t-bar car with the pack running lengthwise and the electronics on the other side. Everything fits nicely and reasonably balanced with some added weight. The problem is that the car starts out driving great and then at the 7 minute mark, starts pushing in one direction and hooking the other. I've tried a variety of different tire combination and it is the same for all of them. I tried running larger tires, 44mm rear/42 frt only to have the car traction roll right off the start. I 've tried thin and thick t-bars with the same results. Changed frt springs and same results.

The only thing I can think of is that our layout has ONE right hand 180* turn and everything else is left including the sweeper into a left 180*, and I'm wondering if the right front tire is getting abused and picking up traction to the point that it starts to dig and make the car hook on left hand turns? We are using good old regular Paragon but the predominant classes are rubber tire VTA & TC so there's lots of rubber in the groove. When you come off after 8 min. the frt tires are caked with build up on the areas that you do not apply any Paragon. ANd don'y suggest doping the eniter frt tire as I tried that too.

It's frustrating in that the car is very fast and easy to drive early, only to become a bag of crap and almost undriveable at the end. This is the same feeling that I always got when I tried link cars in the past.

What should I try next? Jack on the front tires, even stiffer frt springs, more caster, a pit stop tpo change frt tires............ Maybe 24 frt springs with black tires dopped all the way accross?

Thanks for any input as I'm headed to the track Thursday night for more testing.
I suspect the tires are getting hot and picking up the rubber. You'd have to try gray or similar type rubber as was suggested.
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Old 12-15-2009, 04:41 PM   #32931
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Originally Posted by axle182 View Post
Thats not how i understand it. on a square tire, the tire edge will literally fold under as the tire changes shape under the lateral forces, and tear the side wall, and chunk. On a rounded tire, the contact patch on the sides is lesser, and doesnt necessarily provide side bite, it eliminates the square edge from rolling under (not the right way to say it, the car and tire will roll up onto the square edge alot easier) when the car rolls up on a rounded edge, its harder to tear the side wall as there is alot more foam support and rim support (hard to explain without a diagram) and you can actually get some grip flipping without chunking anything. This is as i understand it from touring, to 1/8th onroad. Ive done it literally for years and square edge tires always chunk way way easier than a nicely rounded tire. My 12th tires, i round right to the rim. I dont leave any square side wall and my cars have plenty of traction and hardly chunk.
+1 - Ever since I started rounding the sidewalls, I haven't had a problem with tires chunking...
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Old 12-15-2009, 06:20 PM   #32932
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Hello,

Hopeing someon can help me out. I found this battery at work, it has the following details on it.

3.75v
.589Wh
Lithium Ion Poly

Could this be used to power the servo on a 12scale?

I currently run the Novak booster, but due to space limits I am finding it difficult to put everything on there nicely. so basically want to remove the booster and try this battery.

Any help would be great... thanks

s
i haven't had any trouble with the hobbycity or tqcells boosters, but if someone wants to run a receiver pack, then wouldn't a small pair of A123 cells be the best bet? they can handle very high charge rates like 10C and put out a reasonable voltage at 3.6 each max? this seems like the most convenient battery choice because you can just 'zap' it in the last few minutes before a run. (if you happen to forget to do it until the last minute!)
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Old 12-15-2009, 09:12 PM   #32933
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For those using the Airtronics receivers, do 2C lipo packs work with these? I realize according to Airtronics the receiver is not BEC equipped and can only handle 6V. Experiences?
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Old 12-15-2009, 10:11 PM   #32934
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anyone else waiting on the 1's saddle packs
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Old 12-15-2009, 10:27 PM   #32935
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Originally Posted by Apex View Post
Some of the problem could be the rubber tires from the sedans. They tend to build up a fuzz on the track which causes the 1:12 cars to have very inconsistent handling. I don't know if you have any foam sedan racing there, but you could try having their heats run right before the 1:12 heats to somewhat clean the fuzz on track.

No foam touring at this track although I wish there was.

I think you're going to have the swapping end problem running a 1S on a t-bar car regardless of your setup especially when the grip is high. The thing is you'll probably be able to fix the swapping end issue, but also sacrificing performance of the car at the same time.

Curious why you think that? As long as the car is balanced properly, there should be no advantage for a link or t-bar based on the type of battery and motor. You can change springs, I can change t-bars.

Also, is the track strictly a paragon track or all types of additives being used? If you can get everyone to commit to a one or two it might lead to more consistent track conditions.
Only good old fashion Paragon. I am going to a track this weekend that only runs Jack, so we will see what happens there.

Quote:
SteveL,

Here's my .0001 cent idea. Try the black fronts again, sauce the whole front tire but then wipe off some of the paragon off the front outside tire after a few minutes, leaving on the paragon on the inside of the tire the normal amount of time. It might work.

Steve
Been there, done that. I actually wiped the outside 1/4 immediatly after applying. That was the run that had waaaay too much steering!

Josh....I actually use to run mine setup a lot more like yours when the track first opened and and I changed it as we had little to no traction. I just never changed it back. It is now! Went through the front end tonight and found that the camber on the right frt was more than the left which is backwards of what we need. New tie rod ends, changed caster setup and realigned everything. We will see if it makes a difference Thursday.
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Old 12-15-2009, 10:44 PM   #32936
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anyone else waiting on the 1's saddle packs
Why yes, yes we are!
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Old 12-16-2009, 12:29 AM   #32937
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Why yes, yes we are!
Quote:
Originally Posted by rosko View Post
anyone else waiting on the 1's saddle packs
Speedzone 3.7v Lipo 4800mAh 30C
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Old 12-16-2009, 03:58 AM   #32938
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For those using the Airtronics receivers, do 2C lipo packs work with these? I realize according to Airtronics the receiver is not BEC equipped and can only handle 6V. Experiences?
If your speed control only allows up to 6V to the receiver, then your fine. Otherwise, you'll have to run a receiver pack. I know IP and Epic have released a 6.6v LiFE receiver pack which is what I'm using and works great. No need for a voltage regulator either.
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Old 12-16-2009, 04:28 AM   #32939
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SteveL - This is my .$02. The car is balanced left to right, but the weight is too far forward with the 1S positioned on the left side in parallel with the chassis (if I recall that's how it's positioned, right?). Traditionally, most of the 1:12 designs have the majority of the weight behind the t-bar's front pivot point\shock front pivot point to get a consistent 8 min handling car. You'll probably get the car to work in medium grip situations, but when grip comes up and you've already done everything to keep the car from swapping ends, it'll just be a whole lot of frustration.

Any chance you can post your setup?
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Old 12-16-2009, 06:48 AM   #32940
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That does make some sense now that I think about it. I will let you know what my findings are after tomorrow night. Lots of things to try. Thanks!
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