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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 12-28-2004, 06:35 AM   #10006
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Default Re: Re: Re: Question

Quote:
Originally posted by G Mills
I actually got this car for carpet racing. Would the L4 have been a better choice for carpet?

What would be a good tire compound to start with for carpet racing?
You should be able to make it work on carpet. The only difference between the Yokomo and a 12L3 is the battery spacing on the chassis. The Yokomo battery spacing is a little wider than the 12L3. I do not know about the 12L4. I have not purchased one of those, yet.

Popular opinion seems to be a T bar car works best for modified and a link car works best for stock racing. I use a link car for all carpet classes. I feel that for carpet you need the weight of the car as close to the center line as possible. For asphalt I want the weight as far from the center line as possible to better transfer weight to the outside wheels when cornering. Grip always seems to be an issue when racing on asphalt. That's why I use the Yokomo on asphalt.

For tires I would use gray rears and purple fronts. It really depends on the condition of the carpet you are racing on and or, the amount of traction available from that carpet. If the carpet is old or worn out, you may have to use pink rears and purple fronts or double pink fronts.
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Old 12-28-2004, 07:25 AM   #10007
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The diffrences between masami's worlds car and a stock l4 are that the chassis had some extra cutouts and it was more flexable, also he is running the yokomo rear pod that blackstock and lufaso also got as a suvernior from the worlds, lol. I think the front end is pretty much standard stuff though, maybe a ti upper turnbuckle or something.

And if anyone does know the part # for those bulkheads and the alum ride height spacers he was using (since in other pictures u can see that they are running alum ride height spacers) LMK! lol.
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Old 12-28-2004, 07:59 AM   #10008
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Quote:
Originally posted by nmt6789
Should there be a lot of play in the front axles of the 12l4? I was just putting the finishing touches on my kit and it seems that there is too much play in the fronte axels (wheels move too much)
i did the same thing, not knowing i needed flanged bearings or i had to run jacos, i baught some parma tires. i also had to reshim the rear axle to get the rear tires to fit. to get the fronts to fit was a big steaming pile of work.

first off the front axles were too big in diameter for the supplied kit bearings, so because i was frustrated(having the car for a month and still not having tires on it) i sanded the front axles down till the bearings fit. then i had that 1/4 inch of play on the front, and i couldnt get flanged bearings at my 3 LHS's so i said screw it, and shimmed the bahjesus out of em till there was very little play.

now this isnt the best solution im sure but the wheels spin freely and i can now run my car untill i can get my hands and the cash to get my hands on the proper equipment
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Old 12-28-2004, 08:07 AM   #10009
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what tires are you guys runin outdoor on asphalt? And are you having to change much on setup? Im runnin an l3 with grey rears and green fronts and it was awesome on carpet
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Old 12-28-2004, 09:30 AM   #10010
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Quote:
Originally posted by stormperson
The diffrences between masami's worlds car and a stock l4 are that the chassis had some extra cutouts and it was more flexable, also he is running the yokomo rear pod that blackstock and lufaso also got as a suvernior from the worlds, lol. I think the front end is pretty much standard stuff though, maybe a ti upper turnbuckle or something.

And if anyone does know the part # for those bulkheads and the alum ride height spacers he was using (since in other pictures u can see that they are running alum ride height spacers) LMK! lol.
HG makes the aluminum rear axle ride height adjusters and they are available online. They come in 8 different ride heights.

http://www.1hg.com/home/Indexnf.htm
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Old 12-28-2004, 09:32 AM   #10011
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Quote:
Originally posted by John_S
what tires are you guys runin outdoor on asphalt? And are you having to change much on setup? Im runnin an l3 with grey rears and green fronts and it was awesome on carpet
A good place to start is pink rears and purple fronts. You can also try white rears, green rears & double pink fronts. Depending on the type of asphalt and if they spray something on the track.
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Old 12-28-2004, 09:39 AM   #10012
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Quote:
Originally posted by stormperson
The diffrences between masami's worlds car and a stock l4 are that the chassis had some extra cutouts and it was more flexable, also he is running the yokomo rear pod that blackstock and lufaso also got as a suvernior from the worlds, lol. I think the front end is pretty much standard stuff though, maybe a ti upper turnbuckle or something.

And if anyone does know the part # for those bulkheads and the alum ride height spacers he was using (since in other pictures u can see that they are running alum ride height spacers) LMK! lol.
One thing I forgot to add... be prepared to replace your axle bearings a lot more often as the aluminum ride height adjusters place more stress on the bearings.
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Old 12-28-2004, 11:25 AM   #10013
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Default Re: Re: Masami's Car

Quote:
Originally posted by RobS
I am not sure of the exact specs but from this picture it looks like his car was mostly associated.

if that is Masami's car in the picture that he won the worlds with, then i would say the 12L4 with a few aftermarket parts won the worlds. not the Yokomo we were all thinking of.

he has won the worlds before with AE 12ths, but due to a partial fall out Yok and AE supposedly had over AE introducing the TC3 and AE getting Barry Baker from Yok to drive the TC3.....i guess Masami didn't want to admit he wasn't driving a Yok????????

Last edited by fast-ho-cars; 12-28-2004 at 11:35 AM.
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Old 12-28-2004, 12:00 PM   #10014
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Quote:
Originally posted by AdrianM
Parma has the coolest looking wheels now...

i like the look of them also. haven't seen them up close yet.....

are the rims made of the same hard plastic as the CRC or Jaco's?

or are they a nylon like the TRC's?
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Old 12-28-2004, 12:06 PM   #10015
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Is that you Greg?

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Wow, you found me!

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Old 12-28-2004, 12:13 PM   #10016
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I just got a new truer for Christmas. I knew it was coming so I saved all my new tires to true. I trued 2 sets of Jaco's, 3 set's of Parma, and 1 set of TRC. Out of those, the TRC were only rims not round, which really surprised me, they were Cyan fronts. I finally squeezed them enough to get them fairly round but they probably won't stay.
I really like the look of the Parma rims. I got Pink and Grey rears and Magenta fronts. Very nice workmanship right out of the box and appear to be glued very good. My biggest complaint with Jaco's is the outside starts ripping away after a couple races.


take care
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Old 12-28-2004, 12:23 PM   #10017
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I found TRC wheels to be a bit on the wobble side as well. I personally love Jaco tires and really would prefer to run their rubber only, but their wheels are not something I like, so I use Yokomo black wheels (the ones you see on masami's rear tires at the worlds), they are very strong, yet light and best of all, round and not brittle like Jaco wheels.

What also bothers me about TRC wheels is that they have a different offset.

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Old 12-28-2004, 12:31 PM   #10018
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Jaco's are ass.

They are light, but they oval the inside bearing ring on the first tap of a wall. They also seem to shread foam faster than any other tire mfg I have used.

CRC so far has my vote. Not only have their wheels been more consistently round and resistant to any kind of wobble after many hits, but they also rarely chunk (or atleast I havent been able to chunk a couple sets now). I have dropped my tire consumption and purchases by like 50% since going to CRC goods just based on how long their foams and rims last even with the punishing driving I put them through.

TRC are nice but do tend to bend and wobble more faster. Parma's are my 2nd favorite to CRC, they also are very strong, and pretty resistent to building a wobble or throwing foam it seems.

my Ranking

1. CRC
2. Parma
3. TRC
4. Jaco ( I will never buy Jaco fronts again!!!!!!)
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Old 12-28-2004, 12:47 PM   #10019
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Yes, that was just a small example. Not often i have that many new sets to compare. I've had a couple sets of CRC's. I love the looks of them, but the rears seem to pull away from the rim worse than Jaco.

take care
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Old 12-28-2004, 01:07 PM   #10020
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do you guys have any experience with the yokomo ms1 body? As i have just orderd one
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