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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 10-25-2005, 06:19 PM   #15166
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is there any performance difference between the regular Reedy 19T and the Reedy 19T Dyno?

http://www2.towerhobbies.com/cgi-bin...dy&FVPROFIL=++
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Old 10-25-2005, 06:28 PM   #15167
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Quote:
Originally Posted by tom235
what would i need to make the l4 chassis fit on my l3
CHassis and battery trays.
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Old 10-25-2005, 06:39 PM   #15168
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hey guys

looking to get a body for my crc 3.2, what are the good bodies in 12th scale???

thanks
chris
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Old 10-25-2005, 06:42 PM   #15169
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parma speed 8 or protoform speed 12.
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Old 10-25-2005, 06:46 PM   #15170
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Quote:
Originally Posted by thunderbt3
is there any performance difference between the regular Reedy 19T and the Reedy 19T Dyno?

http://www2.towerhobbies.com/cgi-bin...dy&FVPROFIL=++
Not much the dyno version is just tested, less chance of getting a dud.
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Old 10-25-2005, 06:51 PM   #15171
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How big of a chance that i might buy a dud?

Also, how would I go breaking it in?
Do comm drops actually work? should i get some?
Is motor spray the same as break cleaner?

Sorry, total nitro guy getting into electrics for the first time

Thanks for the info tho
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Old 10-26-2005, 01:15 AM   #15172
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Quote:
Originally Posted by thunderbt3
How big of a chance that i might buy a dud?

Also, how would I go breaking it in?
Do comm drops actually work? should i get some?
Is motor spray the same as break cleaner?

Sorry, total nitro guy getting into electrics for the first time

Thanks for the info tho
I break in my motors by letting them run with no load at two cells (with alligator clips and an old pack) or with a motor checker at approx 2volts untill there are wear marks on the entire brush face of both brushes. This is usually after 10 minutes, but may take longer.
As a newbee to electric, I'd advise you not to concern yourself with comm drops. If used the wrong way, they will give you only headaches.
I use brake cleaner for motorspray, although it's not 100% the same. It does the job for me.
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Old 10-26-2005, 05:21 AM   #15173
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Quote:
Originally Posted by ooge
As long as the LiPo goes to the ESC and the ESC connects to the receiver, you should be okay. Most of the popular ESCs reduce the voltage to a level that the receiver and servo can handle (5 or 6 volts usually)
For those using conventional 4 cell packs, I'm working on a solution to the problem. Anyone interested in being a beta tester?

I recommend the product of VXR Racing. There is a LDO regulator which keeps voltage constant in their product. servo is provided with 6.7V no matter what load may be applied. Visit their page for more detail

http://www.vxrracing.com/
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Old 10-26-2005, 09:41 AM   #15174
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For someone looking at getting into 12th scale...

check this out..
http://cgi.ebay.com/Yokomo-YRX-12-no...QQcmdZViewItem

if the link doesn't work go to ebay and put this in the search section (6008660942) minuse the ( )

I just didn;t have the time to get going in this class.
The servo alone is worth $99.99 so I think the price is quit fair.

-Shookie <><
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Old 10-26-2005, 10:34 AM   #15175
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I just brought Mr. Shookie's 12th scale....he said it is YRX-12 Yokomo (and look like one).......however, I know nothing about Yokomo, does YRX-12 only has the WORLD EDITION (with the silver SSG chassis) only? There are no regular standard black carbon fiber YRX-12?

Just wondering....from those who know Yokomo....thanks.
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Old 10-26-2005, 10:44 AM   #15176
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Howard, you know these cars don't have nitro motors in them, right?
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Old 10-26-2005, 10:52 AM   #15177
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Howard.....If you are going to race that car on carpet I would suggest getting another chassis for it. The stock one is a too soft and makes the car a hand full on carpet when the bite is high like at IRP. I have seen a few guys try to race them and they work ok until the traction level gets high like how it normally is at IRP now. You can get the CRC T-Force chassis for 35 bucks and maybe rear brace and then you will have a better car for carpet or higher bite carpet. Anyway good luck with the car and if you need any help stop by and see me.
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Old 10-26-2005, 11:33 AM   #15178
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Quote:
Originally Posted by ApexSpeed
Howard, you know these cars don't have nitro motors in them, right?
Wait a minute....they are NOT..? I can't mount the tank and the dual chamber pipe on them...?
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Old 10-26-2005, 11:36 AM   #15179
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Quote:
Originally Posted by Kevin K
Howard.....If you are going to race that car on carpet I would suggest getting another chassis for it. The stock one is a too soft and makes the car a hand full on carpet when the bite is high like at IRP. I have seen a few guys try to race them and they work ok until the traction level gets high like how it normally is at IRP now. You can get the CRC T-Force chassis for 35 bucks and maybe rear brace and then you will have a better car for carpet or higher bite carpet. Anyway good luck with the car and if you need any help stop by and see me.
Kevin....once I am ready to be back at IRP, I will constantly bothering you about almost everything of 12th scale...just like last year with the pro 4.
(p.s....I might need idea about foam TC....right now, I have no cars and don't know what to get...)
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Old 10-26-2005, 12:30 PM   #15180
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Quote:
Originally Posted by Rookie Solara
I just brought Mr. Shookie's 12th scale....he said it is YRX-12 Yokomo (and look like one).......however, I know nothing about Yokomo, does YRX-12 only has the WORLD EDITION (with the silver SSG chassis) only? There are no regular standard black carbon fiber YRX-12?

Just wondering....from those who know Yokomo....thanks.
I think the YRX-12WE (silver chassis) is the best asphalt 12th car available!! This is the car that OD, JRRC and I run at all the asphalt races. The reason it works so well on asphalt is that the batteries are placed out from the centerline of the car further than any other 1/12th car. By moving the weight out away from the centerline of the car, you get better traction on surfaces with less grip due to better weight transfer to the wheels on the outside when cornering. On carpet, which has much higher grip that asphalt, you want to move the weight closer to the centerline of the car. Yokomo does make a black chassis for the YRX-12, which has the batteries in closer to the centerline of the car. I will check my inventory when I get home and see if I have one still in the package with a part number
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