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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 12-01-2007, 08:16 PM   #27646
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"NOW...a 25.46 tooth pinion is a bear to find, and it usually doesn't mesh worth CRAP even if you do locate one"

that has to be the line of the day

thanks for posting that though becuase i cant tell you how many times i ask someone how to gear my car at a race.

i acutally copy and pasted that into my race notes on my computer for future ref.

thanks bud
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Old 12-01-2007, 09:23 PM   #27647
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Quote:
Originally Posted by Grenade10 View Post
You know I've already seen this, I quit reading when he said take out a Trinity Spring Thingy and check the spring tension!
That wasn't a Trinity thingy, baby!!

And you were PLENTY interested when I was bending the mil-spec ti wire with it...

Alright, back in my cave.
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Old 12-01-2007, 10:43 PM   #27648
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What about rollout for 19T...? C2 or Money from Checkpoint..?

Tire question....I heard, the new shores for the 12th are F/R Pinks...is that true? I am still stuck with Purple Front and Pink Rear, and with the new bigger rims from Jaco, CRC, Parma....I want to try some new setting...thanks.
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Old 12-02-2007, 07:40 AM   #27649
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Quote:
Originally Posted by Solara View Post
What about rollout for 19T...? C2 or Money from Checkpoint..?

Tire question....I heard, the new shores for the 12th are F/R Pinks...is that true? I am still stuck with Purple Front and Pink Rear, and with the new bigger rims from Jaco, CRC, Parma....I want to try some new setting...thanks.
Pink front and double pink rear I think.
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Old 12-02-2007, 07:45 AM   #27650
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Quote:
Originally Posted by Solara View Post
What about rollout for 19T...? C2 or Money from Checkpoint..?
This is ALMOST like asking "what gear should I run"...there is NO way to answer it accurately online. Every track is different, even every motor can be different. People online can give you a general area to start but there is NO way they can pinpoint the optimum rollout.

Best bet is to ALWAYS ask the "fast guys" at your track about what roll-out they're running. Then don't be satisfied with that--do a little experimenting up and down from there because unless you're running the same motor (same brushes, same springs) etc as they are chances are even their optimum set-up isn't yours. Even driving style comes into it. Someone who treats the throttle like a switch will have to run a lower roll-out than someone who tips into it. The temp gauge (or well-calibrated finger) will tell you if you're approaching danger and the clock will tell you if you're making improvement, slowing down or staying the same.

Example. We race on a club track so we roll the carpet out for each event and create a different track each time. The straight lenght, which is pretty much always the criteria for online guesstimates, is always 65' yet my gearing runs over a 2-3mm rollout range depending how tight we make the infield. The key is figuring out where in that range to go within the, typically, one practice pack and 3 heats before the main while your competitors are too. At a permanent track once everybody has the gearing set you don't typically see big lap time drops between heats, for us it's not uncommon for the faster drivers to improve as much as .5 sec/lap over the day as they get the gearing and other set-up items dialed in on the fly. Then it's back to it for the next race. It never changes a lot so I almost always start out where I left off last race and adjust from there. I end up running Stock in the low 40's mm and 19T in the mid 40's mm and that ranges over about 3mm. On our layouts. With my set-ups. With my driving style. Add caveat of your choice here.
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Old 12-02-2007, 12:12 PM   #27651
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scottrick
1/2 page to tell the fourmula for the roll out,imagine if i asked for the compression ratio of the suspension at a givin corner,what would that be,5 pages answer,lol,very informative post though,thx
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Old 12-02-2007, 01:02 PM   #27652
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WOW, well after i calculate all that were do how do i figure out my pinion still. i guess i am asking is where does my percent want to be.
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Old 12-02-2007, 01:04 PM   #27653
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I got to start reading before i post. What i was asking was where does my final percent usally want to be around.
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Old 12-02-2007, 06:18 PM   #27654
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Good day gents.

I have an old carpet knife v 3.1.
If there are any great setups for stock that you would be able to forward to me please do so thanks.

Tight track with one long straight.

any sites you would reccomend as well would be great.
Thanks in advance.
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Old 12-05-2007, 03:53 PM   #27655
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Tuning Guide Link. Just wanted to post a link to CRC Gen-X manual and tuning guide. Pages 16-18 even though they are meant for the Gen-X they can be applied to all 1/12th scales.




http://www.teamcrc.com/crc/downloads...manual_web.pdf

Last edited by Tire Chunker; 12-05-2007 at 07:21 PM. Reason: typo
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Old 12-05-2007, 05:28 PM   #27656
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Does anyone know where to get a 78 tooth spur gear? Seems everyone is out of the Robinson one. Greatly appreciate any help.
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Old 12-05-2007, 05:53 PM   #27657
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I have RW 78 spurs in stock
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Old 12-05-2007, 05:58 PM   #27658
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Quote:
Originally Posted by Tire Chunker View Post
Tuning Guide Link. Just wanted to post a link to CRC Gen-X manual and tuning guide. Pages 16-18 even though they are meant for the Gen-X the can be applied to all 1/12th scales.




http://www.teamcrc.com/crc/downloads...manual_web.pdf

Great post, I dident even know a guide existed for 12th.
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Old 12-08-2007, 10:26 PM   #27659
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Hey..Can someone post a pic of the wiring job in a CRC with the brushless GTB in it?

Thanks..
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Old 12-08-2007, 11:33 PM   #27660
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Here you go. Compliments of OD.

http://www.rctech.net/forum/showpost...ostcount=23820
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