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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 07-07-2011, 06:16 AM   #36046
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Many thks to all those who answered my question.
Regards,
Brad
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Old 07-07-2011, 10:37 PM   #36047
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Default Jaco Yellow

I am starting to believe that Jaco is purposely producing Yellow-compound rear tires slowly to inconvenience us. Is the only way to get some to order and pay ahead of time and wait until Stormer or some other online hobby shop gets them in? My current set has 1400+ racing laps on them (thats no typo) and I need some new ones. If you guys have a source who still has some, I would appreciate the info.
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Old 07-07-2011, 10:58 PM   #36048
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Have you tried orange? A lot of carpet racers switched from yellow to orange in the rear. Orange is the same tire except it has a harder band on the outside edge.
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Old 07-07-2011, 11:35 PM   #36049
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Originally Posted by DesertRat View Post
I am starting to believe that Jaco is purposely producing Yellow-compound rear tires slowly to inconvenience us. Is the only way to get some to order and pay ahead of time and wait until Stormer or some other online hobby shop gets them in? My current set has 1400+ racing laps on them (thats no typo) and I need some new ones. If you guys have a source who still has some, I would appreciate the info.
Quote:
Originally Posted by InspGadgt View Post
Have you tried orange? A lot of carpet racers switched from yellow to orange in the rear. Orange is the same tire except it has a harder band on the outside edge.
Orange is good for stock racing, but I find that yellow is what I need to lock in the car for 8 mins of mod carpet racing.

Yellow Jaco are very hard to find.
Not sure they are selling 12th scale tires at all lately...

I believe GS Hobby and A-Main had a few left.
Unless you want to go the HK route.
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Old 07-08-2011, 12:48 AM   #36050
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I don't know whether it is the carpet/additive we use but pretty much everyone runs pink or magenta rears in the UK nowadays. Yellow hardly gets a look in.

Trev
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Old 07-08-2011, 12:50 AM   #36051
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Quote:
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If anyone has any experience with any zero timing 1S set-up at all, I'd really like to hear thoughts on rollout. Just need a starting point...
I've answered you on the Tekin forum.

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Old 07-08-2011, 07:21 AM   #36052
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Quote:
Originally Posted by TrevCoult View Post
I don't know whether it is the carpet/additive we use but pretty much everyone runs pink or magenta rears in the UK nowadays. Yellow hardly gets a look in.

Trev
I agree with you there Trev, although I have found that CRC yellow's last longer through the 8 minutes than Jaco yellow's do. Pink rears are what I generally use on the back here in the UK.
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Old 07-08-2011, 07:32 AM   #36053
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Originally Posted by TrevCoult View Post
I don't know whether it is the carpet/additive we use but pretty much everyone runs pink or magenta rears in the UK nowadays. Yellow hardly gets a look in.

Trev
I wish we could use those as they have much less wear, but at our track they heat up too much, and loose grip at 5mins.
They used to work on our carpet, but something changed in the last 6 months or so.
We can get away with mag in stock, but the car will not be consistent for 8 mins.

Perhaps if we were allowed to use Paragon instead of JTG it would be different..

I'm sure at iic they will be the ticket.
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Old 07-08-2011, 09:41 AM   #36054
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I wish we could use those as they have much less wear, but at our track they heat up too much, and loose grip at 5mins.
They used to work on our carpet, but something changed in the last 6 months or so.
We can get away with mag in stock, but the car will not be consistent for 8 mins.

Perhaps if we were allowed to use Paragon instead of JTG it would be different..

I'm sure at iic they will be the ticket.
We had an inconsistent issue 2 winters ago and last winter we went and rented a steam cleaner and used a really diluted simple green solution to clean it with and we are now using Pinks with 10.5 Timing and Mod

traction lasts now up to 11 min with Paragon FX II
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Old 07-08-2011, 10:02 AM   #36055
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We had an inconsistent issue 2 winters ago and last winter we went and rented a steam cleaner and used a really diluted simple green solution to clean it with and we are now using Pinks with 10.5 Timing and Mod

traction lasts now up to 11 min with Paragon FX II
This has been suggested before, we'll have to see if we can talk the track owner into it.
Thanks for the Simple green tip.
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Old 07-08-2011, 11:09 AM   #36056
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When a JTG track on older carpet starts to get hot > 70 deg and has a lot of compound worked into it, it starts to get gummy and clogs up the higher rubber content foam tires like CRC Mag and Pinks.

This issue won't be as bad on new carpet which is why at most big races it's not an issue. If anyone has gone to IIC i believe this is why Scotty keeps the room cool.

Switch over to CRC Gray or Black front's and yellow or gray rears, you should be good. Gray\yellow do wear fast but that's the price we pay to be fast.

Cleaning the track will definitely help the problem for awhile. If the carpet gets run on a lot with foam tire cars it will start to happen again in about 4-5 weeks. Our local track cleans the carpet every 8 weeks, which is a blessing that they take the time to do this as during the summer it makes for a much better racing surface.
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Old 07-08-2011, 11:11 AM   #36057
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When a JTG track on older carpet starts to get hot > 70 deg and has a lot of compound worked into it, it starts to get gummy and clogs up the higher rubber content foam tires like CRC Mag and Pinks.

This issue won't be as bad on new carpet which is why at most big races it's not an issue. If anyone has gone to IIC i believe this is why Scotty keeps the room cool.

Switch over to CRC Gray or Black front's and yellow or gray rears, you should be good. Gray\yellow do wear fast but that's the price we pay to be fast.

Cleaning the track will definitely help the problem for awhile. If the carpet gets run on a lot with foam tire cars it will start to happen again in about 4-5 weeks. Our local track cleans the carpet every 8 weeks, which is a blessing that they take the time to do this as during the summer it makes for a much better racing surface.
This is exactly our issue, though only us 12th scale mod guys really notice it.
And those are the tires that work best for us now too.
Not as fast as Magenta or pink in the first few minutes, but much more stable for 8 mins.

Our CRC rug has about 18 months of racing now.
Last week it was 96 deg ambient, but I'm sure it gets much hotter on the days they are closed with no air circulation.
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Old 07-08-2011, 11:53 AM   #36058
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This is exactly our issue, though only us 12th scale mod guys really notice it.
And those are the tires that work best for us now too.
Not as fast as Magenta or pink in the first few minutes, but much more stable for 8 mins.

Our CRC rug has about 18 months of racing now.
Last week it was 96 deg ambient, but I'm sure it gets much hotter on the days they are closed with no air circulation.
You should notice in the evening after the sun goes down and the air temp starts to decrease the track get a little faster. Of course in So Cal the temp may not drop much from 8 to 10pm. This winter you should be able to switch back to Mag\Pink.

Are you racing at TQ?
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Old 07-08-2011, 12:37 PM   #36059
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You should notice in the evening after the sun goes down and the air temp starts to decrease the track get a little faster. Of course in So Cal the temp may not drop much from 8 to 10pm. This winter you should be able to switch back to Mag\Pink.

Are you racing at TQ?
Yes at TQ.
We had the same issue starting around December with the tires, even on cold nights.
But it wasn't always this way, last fall and before that, Magenta was still the go.
Took a while to sort out what was happening.

Up at Nor-Cal where they use Paragon it's not an issue.
I didn't need Yellow up there.
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Old 07-08-2011, 01:04 PM   #36060
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Yes at TQ.
We had the same issue starting around December with the tires, even on cold nights.
But it wasn't always this way, last fall and before that, Magenta was still the go.
Took a while to sort out what was happening.

Up at Nor-Cal where they use Paragon it's not an issue.
I didn't need Yellow up there.
Paragon is the S$#&, it's to bad so many people complain about it's smell.

When i was out there in Feb the grove was quite black and gummy looking. It was great for TC. I saw Bob's 12th scale after a race and the tires where completely glazed. If you can get the owner to try cleaning the carpet every 3 - 6 months it will definitely help with this problem.
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