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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 07-30-2011, 07:54 AM   #36136
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Default C.Andy conversion

The issue i see with molded CF is the difficulty in doing it which will drive up cost. I'm sure this conversion is not inexpensive.

CFR,
Any chance you're working on one for a CRC car?
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Old 07-30-2011, 01:09 PM   #36137
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Quote:
Originally Posted by wingracer View Post
It's interesting but it looks like you have to swap shims to change gear mesh. That means gear range will be limited, changes will also slightly change wheelbase and generally be a pain in the rear. No thank you.
Not only that but every time you change gear ratio your wheel base changes.
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Old 07-30-2011, 01:10 PM   #36138
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Quote:
Originally Posted by bkspeedo View Post
The issue i see with molded CF is the difficulty in doing it which will drive up cost. I'm sure this conversion is not inexpensive.

CFR,
Any chance you're working on one for a CRC car?
Especially when it could easily be done without the molded CF and keep the costs lower.
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Old 07-30-2011, 01:26 PM   #36139
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Quote:
Originally Posted by InspGadgt View Post
Not only that but every time you change gear ratio your wheel base changes.
I believe I mentioned that.
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Old 07-30-2011, 02:32 PM   #36140
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Ooops...missed that...darn pics made the screen too wide and cut off some of what I saw.

Still it is a cool idea and I'd like to see more development on it
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Old 08-01-2011, 08:43 AM   #36141
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Quote:
Originally Posted by InspGadgt View Post
Ooops...missed that...darn pics made the screen too wide and cut off some of what I saw.

Still it is a cool idea and I'd like to see more development on it
Are you going to Las Vegas IIC

Wait until you see my Car

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Old 08-01-2011, 11:45 AM   #36142
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I will be there Alf! Looking forward to seeing the changes you have made...haven't seen you post anything in awhile and I was beginning to wonder what was up. See ya there!
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Old 08-01-2011, 01:58 PM   #36143
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Question for all of the 1/12 scale racers out there: What was the scariest corner section you ever had to race around? The one where taking it right promised the glory of untouchable lap times but taking it wrong, even once, sawed the car in half and the difference was inches? The scariest one I ever saw was a carpet track that at the end of a 100' straight it sported sharp chicane which fed into a 270 degree sweeper right that was entirely made of rooted 2x4's and the lane was effectively about 5' wide, and in order to go fast you had to enter the first corner at top speed. It was a car-breaker.
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Old 08-06-2011, 01:02 AM   #36144
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I race an old CRC 3.2R with the short links, one of the advantages or disadvantages of this is it is possible to tune in some rear steering by angling the links up or down, but which would be better, none or minimal rear steer, rear steer that would angle the back end out (like a four-wheel-steer would) or rear steer that would angle the back in? Any thoughts?
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Old 08-06-2011, 10:00 AM   #36145
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Rear steer is only an advantage in oval racing where you only turn left. If you add rear steer in you will have a slight advanage for turning one way but have a disadvantage when turning the other way. So in effect you would be canceling out any advantage and having to fight the car half of the track.
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Old 08-06-2011, 06:52 PM   #36146
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Oval guys create rear steer by angling the whole rear pod so that the rear axle is no longer at 90' to the centerline of the chassis. If you add a bit of rear steer by angling the links it gives equal effect in both directions. We used to raise the front of the T-bar which among other things produces a bit of rear steer. You would have to try it to see how you prefer it or if you can feel it at all. I never tried it on a link car.
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Old 08-07-2011, 02:42 AM   #36147
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Just don't forget, angling the link up or down also raises/lowers the rear rollcenter significantly.
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Old 08-07-2011, 10:18 PM   #36148
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Quote:
Originally Posted by Der Dicke View Post
Just don't forget, angling the link up or down also raises/lowers the rear rollcenter significantly.
I'm not so sure, I would be angling the front mount of the link where it is bolted to the chassis, not the rear.
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Old 08-08-2011, 02:54 AM   #36149
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Hi Guys,

Need a little bit of help, I need to know what would be the best Pion gears to use for a 4.5 turn engine and what Spur gears can you run on a
Serpant S120 link?

Thanks
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Old 08-08-2011, 06:58 AM   #36150
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Quote:
Originally Posted by driver24 View Post
Hi Guys,

Need a little bit of help, I need to know what would be the best Pion gears to use for a 4.5 turn engine and what Spur gears can you run on a
Serpant S120 link?

Thanks
For mod on indoor carpet we run large spurs, 94-96t
small pinions, mid to low 20t range

PRS make very solid gears.
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