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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 10-25-2006, 05:04 PM   #21466
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pic of the track
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Old 10-25-2006, 05:04 PM   #21467
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Quote:
Originally Posted by P2
Me too,
Took a break from RC in 97 and raced for Santa Cruz Japan from 00-03. Moved back to the US and started RC again, the guy behind me won...I was the first looser
See you next month
Damn i wish i was fast enough to need one, i must train harder .....
And do more blacks runs on steve peats training ground.
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Old 10-25-2006, 05:09 PM   #21468
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Batts are on their way, it was a little embarassing loosing 10-12ft a lap down that 80ft straight. Hopefully the 42s will keep the lap traffic from ramming me the 2nd 1/2 of the race.

Mark
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Old 10-25-2006, 05:17 PM   #21469
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Quote:
Originally Posted by rogtsaamokin
Great info guys, what size track are you running on for those combos? We run on a ultra smoothe 100x48 track @ Omaha-HobbyPlex, and we were in the 1.75 range with 767's trimmed also, will have to try the f-brush, how does it hold up back to back? I remember the days in spring combos that was trinity tear-downs with blue springs boy those days are over Anyone try the new Jaco yellow / black tires yet?

Yes we did tried the Yellow/ black and it is okay...the car is easy to drive and some little push from the begin.( if you can't make misstake, the front tire cool off and it will push even more ,you'll have to run a few laps to get the grip traction back......The Super fast Trav was using the yellow /DD pink and he was so fast the car turn on the dime..
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Old 10-25-2006, 05:18 PM   #21470
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Quote:
Originally Posted by mtveten
Batts are on their way, it was a little embarassing loosing 10-12ft a lap down that 80ft straight. Hopefully the 42s will keep the lap traffic from ramming me the 2nd 1/2 of the race.

Mark
Ya got me some batteries too
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Old 10-25-2006, 05:40 PM   #21471
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this is the track i run 47mm roll out on
Attached Thumbnails
1/12 forum-b_bon-road-20010.jpg  
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Old 10-25-2006, 05:58 PM   #21472
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Quote:
Originally Posted by GrandeGixxer
This was at the Parma booth at the IHobby show, Is it a new body or an old one. The one on the right looks a lot like a speed 12. I dont think they would use a protoform body in their display though. Even though the JRXS in the horizon tent had an LRP speedo in it.
The shell seen on the left is the Zytek. This has been out for a couple of years, and its what pretty much everyone uses in the UK, as the pf speed 12 and parma speed 8 aren't legal.
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Old 10-25-2006, 05:59 PM   #21473
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and it held up all the way throughout the 8 minutes pretty well.didnt really fall off at all


Race# 4 -- 12 scale 19 turn - Heat #1 round 2 --
Pos Car Laps time name id
1 3 36 8:10.97 Jason breiner 19
2 2 34 8:09.05 Mason McCombs 14
3 1 34 8:11.88 John Chance 12
4 5 32 8:02.58 Mark Burt 5
5 4 31 8:08.01 Mike Martin 17


-- RACE #4 - 12 scale 19 turn - Heat #1 Round 2 --
Car-> __1__ __2__ __3__ __4__ __5__
1 5/16.8 3/15.0 1/14.0 4/15.4 2/14.4
2 5/14.8 3/14.2 1/13.6 4/15.1 2/14.4
3 4/15.4 2/14.6 1/13.6 3/14.9 5/23.5
4 4/15.5 2/14.1 1/14.3 3/14.9 5/15.0
5 4/14.9 2/14.4 1/14.3 3/14.8 5/13.6
6 4/13.9 2/14.2 1/13.2 3/15.4 5/14.7
7 3/13.9 2/14.1 1/14.1 4/15.6 5/13.8
8 3/14.3 2/14.5 1/13.3 4/14.8 5/
9 3/13.8 2/16.7 1/13.5 4/15.5 5/16.1
10 3/17.0 2/14.3 1/13.9 4/14.3 5/13.8
11 3/ 2/14.0 1/13.3 4/ 5/16.1
12 3/15.2 2/14.6 1/13.1 4/15.4 5/14.8
13 3/13.9 2/14.2 1/13.2 4/14.8 5/13.8
14 3/14.1 2/14.2 1/13.4 4/14.3 5/15.3
15 3/14.3 2/14.4 1/13.3 4/15.9 5/
16 3/14.7 2/ 1/13.4 4/15.1 5/31.3
17 3/13.9 2/13.8 1/13.6 4/ 5/
18 3/14.1 2/14.3 1/13.5 4/19.2 5/14.6
19 3/14.4 2/14.0 1/13.3 4/14.9 5/13.8
20 3/13.7 2/13.9 1/13.2 4/14.9 5/14.0
21 3/14.0 2/14.0 1/13.3 4/ 5/13.8
22 3/13.7 2/14.4 1/13.5 5/34.1 4/13.5
23 3/14.0 2/14.0 1/13.4 5/14.5 4/14.1
24 3/14.2 2/14.3 1/13.8 5/14.5 4/14.0
25 3/14.2 2/14.1 1/13.5 5/ 4/13.5
26 3/14.6 2/14.0 1/13.5 5/15.4 4/14.6
27 3/14.1 2/14.1 1/14.4 5/14.4 4/14.3
28 3/13.7 2/14.3 1/13.9 5/14.5 4/14.0
29 3/14.3 2/14.0 1/13.4 5/14.8 4/13.3
30 3/14.0 2/14.1 1/13.5 5/14.4 4/13.8
31 3/13.7 2/14.8 1/13.6 5/14.8 4/13.7
32 3/ 2/14.1 1/13.6 5/14.5 4/13.7
33 3/15.2 2/14.4 1/13.6 5/14.5 4/13.7
34 3/13.7 2/14.9 1/13.8 5/16.2 4/14.1
35 3/13.8 2/14.3 1/13.5 5/14.8 4/13.6
36 3/14.2 2/ 1/13.4 5/ 4/
_____ _____ _____ _____ _____ _____ _____ _____ _____ _____
laps 34 34 36 31 32
time 491.8 489.0 490.9 488.0 482.5
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Old 10-25-2006, 06:09 PM   #21474
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Quote:
Originally Posted by protc3
full face F brushes with red springs + and - and roll it out at 47mm.this is the fastest combo i have found and it has been sickening fast.
what do you think of green springs,and ya 47 seems to be the ball park.
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Old 10-25-2006, 06:33 PM   #21475
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Ooookay.

Basically im looking for a new 12th scale chassis. I am running an old 3.1 but its seen better days.

Which car were CRC running at vegas this year? is it available?

And also, i remember seeing a slapmaster? still around?

And does anybody have any recommendations on a chassis. i am looking for a decent quality chassis preferably with a big ring diff.

Whats this diff that has been mentioned that lasts "ages"?

Thanks
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Old 10-25-2006, 06:36 PM   #21476
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Quote:
Originally Posted by pheyhoe
Ooookay.

Basically im looking for a new 12th scale chassis. I am running an old 3.1 but its seen better days.

Which car were CRC running at vegas this year? is it available?

And also, i remember seeing a slapmaster? still around?

And does anybody have any recommendations on a chassis. i am looking for a decent quality chassis preferably with a big ring diff.

Whats this diff that has been mentioned that lasts "ages"?

Thanks
IM waiting for this car too,i hear soon.
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Old 10-25-2006, 06:37 PM   #21477
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Default 1/12th chassis

The SP12 Corally has a big ring diff dosen't it??




Losi Truck - Xray Tourer - Mugen Buggy - Associated 1/12
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Old 10-25-2006, 07:43 PM   #21478
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Quote:
Originally Posted by rogtsaamokin
pic of the track
That is the present layout for the race this weekend? Or a past snap shot?? Looks like a ton of fun!

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Old 10-25-2006, 07:50 PM   #21479
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Quote:
Originally Posted by wallyedmonds
what do you think of green springs,and ya 47 seems to be the ball park.

green springs will generate alot of rpm but with the voltage in todays cells,they genrate too much heat.i went away from them after the 36 and 3700 cells and went to reds to eliminate power loss generated from arcing and the heat created from this.
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Old 10-25-2006, 08:05 PM   #21480
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David , We ran that layout in the spring race this year, I am sure Tim will have something pretty tricky up his sleave , He usually likes to copy some version of a big race in the past, so be prepared!! Is this your first time to the Plex????
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