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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 07-11-2007, 10:04 AM   #26191
aca
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Hey Guys I need a little info on tire selection. I've been running purple fronts and double pink rear on my 12l4 for the last 4 races and it's time to try a new set out. The track is a large ( 160 ft. straight a way ) ,flowing asphalt track with I'd say med bite. Is there some other comb I could try that might give me a little more turn in and rear grip? I'm new a 1/12 scale and don't have a big budget for tires. Any info would be helpful.
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Old 07-11-2007, 03:40 PM   #26192
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Hey aca, though I have not raced asphalt 1/12th in years I race my L4 on carpet but here Is what I would try.

Your on point with the tire's but try this:

Front:
Jaco 2 stage double pink little softer than purple
Associated .20 spring
1 degree camber
10 degree caster

Center spring Olive w 20 or 25w associated oil
T-Plate .63 take the center screw out of the T plate just run the outer ones

Rear tires Jaco 2 stage double pink
Now for traction compound try this:

Use paragon let it sit for 15 min while the paragon is still on the tire massage Copper tone # SPF 45 suntan lotion on the tires and let that sit for 15 min

What the coppertone does is hold the traction on longer I think that should help your traction problems

again I have not raced asphalt in years but that setup i posted should put you in the right direction.

Hope this helps
Mike
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Old 07-11-2007, 04:56 PM   #26193
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We run magentas or double pink fronts and pink rears on outdoor asphalt.
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Old 07-11-2007, 07:44 PM   #26194
aca
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Thanks Mike and Carlos for the tire tips, the car handles pretty well now but I wanted to try for a little better. I'll give this a try.
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Old 07-11-2007, 08:11 PM   #26195
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Hey aca post your setup so we know what you are runnning and can help you out alittle more. If you want alittle more steering try a silver spring on rhe center shock and then try adding 1 mm of droop in the rear. Also try different lubes like the Ofna diff lube on your disk. The thicker you go the more steering you will get. I have used from 3,000wt. ofna diff lube to 10,000wt. mugen diff lube. It is just trial and error to find out what works for your style of driving.
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Old 07-11-2007, 09:24 PM   #26196
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Carlos, I'm running the same setup that Mike posted above, but I've never tried lubing the disks. I've been advised to try some Ofna 5,000 lube on the disks and the king pins, and I've already got some ordered. The car already handles pretty good to me, but I didn't think I hit on the perfect setup on the first try! I've had one other 1/12 before, a 12l3, and I couldn't drive it for crap! So I sold it, never that I'd race a 1/12 scale ever but I'm having fun with this one!
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Old 07-12-2007, 10:15 PM   #26197
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I'm getting back to 1/12 with stock 12L4 to give it a try again. My current track is small indoor asphalt with medium traction, and I probably will run 23T stock motor. I think pink or double-pink is the choice of tire. What else I should start with on setup?

Btw, should I change 12L4's damping disc to damping rod from begining? As seems most of ride nowday are using damping rod rather than disc.

Thanks.
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Old 07-12-2007, 10:35 PM   #26198
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Hey ttso, You can try my setup and start from there use this for more of a guide line and eventually you will find a setup that suits you.

Im not sure for 23t setup I've never ran them just 27t,19t and Mod over here in the States. I know there is a 23t thread on here somewhere I think someone posted there 1/12th motor gearing/setup there.

As for dampner tubes it seems more popular than disks the car is bit more consistant.

Hope this helps
Mike







Quote:
Originally Posted by mike ivy View Post
Hey aca, though I have not raced asphalt 1/12th in years I race my L4 on carpet but here Is what I would try.

Your on point with the tire's but try this:

Front:
Jaco 2 stage double pink little softer than purple
Associated .20 spring
1 degree camber
10 degree caster

Center spring Olive w 20 or 25w associated oil
T-Plate .63 take the center screw out of the T plate just run the outer ones

Rear tires Jaco 2 stage double pink
Now for traction compound try this:

Use paragon let it sit for 15 min while the paragon is still on the tire massage Copper tone # SPF 45 suntan lotion on the tires and let that sit for 15 min

What the coppertone does is hold the traction on longer I think that should help your traction problems

again I have not raced asphalt in years but that setup i posted should put you in the right direction.

Hope this helps
Mike
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Old 07-13-2007, 08:51 AM   #26199
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Can someone tell me where I can find the metric sized screws used for the front end so I can get rid of these dreadful phillip screws?
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Old 07-13-2007, 08:56 AM   #26200
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Are you sure they're metric and not 8-32?

If they're 8-32, Lunsford makes some nice titanium flathead socket cap ones. 7/16" or 1/2" long.
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Old 07-13-2007, 08:59 AM   #26201
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Well this is what I'm looking at but I don't know what I'm looking for... page 5

http://cefxraceway.net/?mainURL=/sto...b8yi/CEFX.html
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Old 07-13-2007, 09:02 AM   #26202
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these are not metric but are TI and use allen wrenches

http://www.lunsfordracing.com/mm5/merchant.mvc?
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Old 07-13-2007, 09:06 AM   #26203
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Default hpi 1/12th pan car

hey all;What's the latest on the release of the new hotbodies 1/12th pan car?Also what does this meen for the future of the hara racing products hammer 1/12th scale car?Thanks for the info
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Old 07-13-2007, 09:14 AM   #26204
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You are correct Micky B, they are 8-32. I found them on Cyrul's site. Thanks
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Old 07-13-2007, 01:22 PM   #26205
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Hey Guy's

Last year I've driven several races with a brushed 1:12. 4 cell (9 and 7T).
It went very well. This year I’m willing to go for brushless.
I’ve got a TC spec in my TC. But that’s really NOT gonna fit in a 1:12.
So I’m looking for a new Brushless Speedo for my CRC Gen X.
I cant make up which one I should choose:

LRP Sphere Competition 2007 (80700)

Nosram Matrix Evo 2007 (90700)

I know that both ESC compare to each other, bot I’m not sure I’m really taking the right one. So I just wanted to ask some of you guys. Which one do you prefer, and most of all.. Why?

Greetings from The Netherlands,

Robert
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