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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 12-03-2002, 08:39 PM   #1981
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Default COXY!!

I JUST BUILT MY YOKOMO 1/12TH SCALE ITS PRACTICALLY LIKE THE ASSOCIATED CAR..
I HAD A PROBLEM WITH MY DIFF.. UNABLE TO ADJUST.. AND REAL GRITTY, THE CONE WASHER FOR ADJUSTMENT BOTTOMED OUT AGAINST THE BEARING.. I INSTALLED 2 WASHER TO FIT ONLY ON THE INNER RACE OF THE BEARING.. THIS MADE THE DIFF TOTALLY COME TO LIFE.

MAKE SURE THE WASHER AND/OR SHIM DOESNT TOUCH THE OUTER BEARING AND YOU SHOULD BE OK.
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Old 12-04-2002, 03:09 AM   #1982
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Hi

Where is the best place to by Trinity Switchblde cars, cant find a store that have them in stock?? Does the Jaco rims fit??

Regarding the CRC carpet knifes rear with problem, i did get a reply from. They have problems with the rear end. It is wider on the left side and cant be schimmed away (the car becomes to wide then ) I grind the small nub away from the left wheel hub.
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Old 12-04-2002, 10:02 AM   #1983
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You can buy direct from Trinity. Get their # from teamtrinity.com, but you are gunna pay FULLLLLL retail @$299.99. I bought my from local shop in Enfield, CT. If you want a kit, call Chris Marcy @ 860-741-6501. Tell him Raul sent you. He's got the best pricing.
Good luck.
I get mine this weekend.
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Old 12-04-2002, 11:58 AM   #1984
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Practically like an L3???
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Old 12-04-2002, 03:39 PM   #1985
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Who went to Cleveland...and how did you do???
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Old 12-04-2002, 06:12 PM   #1986
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Hello Dragon,

I went to Cleve. again this year. Ran mod taxi and mod 12th. First year for both. I ended up in the E in 12th and lead most of it until I parked it 3 laps from the end. Tried to pass the leader on the last corner, last lap and turned in too early. Ended up third as I got passed while waiting to be marshalled. Ah well, not bad for my first year and not getting as much practice as I needed. My heart wasn't in it enough either but I lost my grandmother on the 19th to lung cancer so you can understand why I was distracted.

Kevin,

I think Tigger ended up either in the D or F, I'm not sure. We ran our first two quals together and I don't remember passing him either time so his car must have been ok. The pace to get in to the A was incredible! Most guys were running 8s and I think Josh and Paul ran 7s a couple times. Talk about rip! Hats off to Dosie, he drove a smart race and avoid crashes. He wasn't the fastest car out there but that doesn't matter when you cross the line first.

Socko
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Old 12-04-2002, 07:45 PM   #1987
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Socko......Im sorry to hear about your loss my heart goes out to you and your family. Sometimes racing does wonders to get your mind off of things but reality is always there when its over.
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Old 12-04-2002, 09:33 PM   #1988
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Socko...sorry to hear about your loss....

How was Cleveland........did you get any sleep????......you goin' to Snowbirds?????how about the on-road Nats?????we are gonna run foams in stock class,to get ready for the snowbirds.
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Old 12-04-2002, 10:37 PM   #1989
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Kev- maybe will be up at Venture this Sat but not sure because i have a lot to do. Regarding a race report at cleveland let's just say that i only finished my first and second qualifier with the first one seeing me railed into the boards three straight times by the same backmarker and losing a slow 42 and third place which at the time was decent. The second qualifier i missed something on the car and the car pushed terribly in the left hand corners. My third qualifier i had massive radio hits after the re-shuffle and only ran two minutes and the fourth qualifier was going decently well with another third place run on a slow 43 when someone ran up the back of my car on accident at full speed and broke the car 5min into the run. The carpet neccessitated some...ummm... very different setups from normal because there was no groove for the 12th mod rounds. I later found out that many had gone to thin t-bars and different tire compositions such as pink rears and magenta fronts. I had made some changes for my third Practice run that got the car driveable by going to white rears, a 072" t-bar (down from my 078" t-bar) and only doing half of my purple fronts. In the midst of all that went on i didn't adjust the chassis as well as i should have. I drove well all weekend, just didn't get the car dialed in to the unique track conditions. I learned a lot though regarding that issue and that should help in the future.
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Old 12-04-2002, 10:52 PM   #1990
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Socko- My condolences, it was good to see you at cleveland.
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Old 12-04-2002, 11:12 PM   #1991
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Socko- that would explain why you didn't seem like you were enjoying yourself now that i think about it. Good job in the main.

Ammendment- most people that i talked to ran white rears (jaco) which are similar to TRC and T.M. Grays and it varied from what i was told on fronts and front springs used. One of the points about being fast on a national level is that you must be able to recognize, adapt, and overcome because you will find different circumstances from what is normaly found at the local track(s) and the Factory Guys are awesome at doing this along with their driving skills. That's why i keep talking about needing to learn more, to test more, because when i face what i'm not use to then i will need to adjust and experience will count for a lot. Let's keep up the discussions about different setups and track conditions so we all keep getting faster.
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Old 12-05-2002, 07:14 AM   #1992
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How was the new style of carpet they used?

Was that one of the resons for the change in tire?
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Old 12-05-2002, 08:46 AM   #1993
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does anybody use the Lunsford Ti front axles?
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Old 12-05-2002, 11:02 AM   #1994
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newracer
Mike, I put them on my carpet knife. I now don't have to use a shim with the Jaco wheels. They have a shoulder on them to space them out from the hub.
Hobbytown Ft Collins has some.
Dave
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Old 12-05-2002, 11:46 AM   #1995
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Quote:
Originally posted by Fiddle Fadel
newracer
Mike, I put them on my carpet knife. I now don't have to use a shim with the Jaco wheels. They have a shoulder on them to space them out from the hub.
Hobbytown Ft Collins has some.
Dave
that shoulder is what I was worried about, I wonder how it will work with other wheels, specifically CRC's.

Dave are you racing this weekend? Have you been down to practice yet? What's the cost for practice? I am going to race this weekend for the first time.
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