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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 11-07-2007, 02:24 AM   #27331
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Quote:
Originally Posted by odpurple View Post
There are many 19t motors, all of which require different gearing. Post which motor you are using and someone will give you a rollout.
PS your batteries need to be replaced
I just wanted a ballpark number but I will either be running an Atlas-based or Checkpoint-based 19T.
Thanks,
Kane

PS- I know my batteries need to be replaced but the twenty-thousand dollars I spend on RC a year is dwindling right now! (I don't need new batteries until January anyway)
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Old 11-07-2007, 05:34 AM   #27332
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Quote:
Originally Posted by Quante
And what proof do you have that these "chemically stable" Orion cells are better then lets say IB4200wc or the almighty GP4600
just a heads up Quante, that in Europe CML (main UK distrubuter) has stopped supplying certain cells, until these "blow ups" have been resolved.
Heres some more from Oople forum: http://www.oople.com/forums/showthre...?t=6186&page=1
and the Norwegian event that was cancelled due to batteries exploding:
http://www.motorsportforbundet.no/rc...6&x=1&a=210833
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Old 11-07-2007, 07:24 AM   #27333
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Quote:
Originally Posted by jbsmith1 View Post
just a heads up Quante, that in Europe CML (main UK distrubuter) has stopped supplying certain cells, until these "blow ups" have been resolved.
Heres some more from Oople forum: http://www.oople.com/forums/showthre...?t=6186&page=1
and the Norwegian event that was cancelled due to batteries exploding:
http://www.motorsportforbundet.no/rc...6&x=1&a=210833
I know, its getting bad nowadays. Here at the local tracks there's also the exploding cell problems but as far as I know its just IB4200WC that have this nasty habit. So what to chose next... I tried GP4600, very expensive Orion packs and as I said, after 2 months of use and good maintenance they's down to some 3500mAh in, 2800 out with a voltage way lower then my 2 year old IB4200s.
Been reading good things from EP so I'm trying these next , as far as the new Orion cells. I'm not saying they're bad or anything but I was also told 4600 were a lot better but look where that got me.

Does it ay anywhere what cells CML has stopped distributing??
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Old 11-07-2007, 07:39 AM   #27334
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I'm going to be running ep4600's for the 1st time this weekend. Will see how they hold up.
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Last edited by SRW141; 11-07-2007 at 05:15 PM.
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Old 11-07-2007, 08:17 AM   #27335
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Originally Posted by SRW141 View Post
I'm going to be running gp4600's for the 1st time this weekend. Will see how they hold up.
All I can say is mine were terrible. Make sure you put a lot in them when you store em. 1000mAh held only a few days with me! Very high self discharge.
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Old 11-07-2007, 09:22 AM   #27336
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So what cell is everyone going to be running in Cleveland this year?
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Old 11-07-2007, 09:26 AM   #27337
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Quote:
Originally Posted by Quante
Does it ay anywhere what cells CML has stopped distributing??
The CML info has come from my local model shop in convidence, but this company is not alone in the way they process these Chinese cells to acheive the low IR and high voltages.
The problem is some of these blow ups can be attributed to miss use, over charging, even re-peeking at high currents, and others to soldering over the vent holes or distorting the end plate seal, from too much heat when soldering, then theres always the un-explained incidents.
This all threatens the future of these cells with the BRCA/EFRA boards(as you will have read in the links on my other post), with club racing and national events being cancelled for safety, the TeamOrion cells, could be the first of a new bread of cells legalised for the 2008 season.

ygpm Quante
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Old 11-07-2007, 01:06 PM   #27338
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Quote:
Originally Posted by Kane-o View Post
I just wanted a ballpark number but I will either be running an Atlas-based or Checkpoint-based 19T.
Thanks,
Kane

PS- I know my batteries need to be replaced but the twenty-thousand dollars I spend on RC a year is dwindling right now! (I don't need new batteries until January anyway)
OK ballpark would be about 50mm
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Old 11-07-2007, 01:17 PM   #27339
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ae 12th scale the same as pan cars or are they differnt, if so what cars do people generaly use?
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Old 11-07-2007, 01:19 PM   #27340
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I'm new to 1/12, does anybody run Lipo?
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Old 11-07-2007, 01:25 PM   #27341
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All this talk about exploding batteries is reminding me why I prefer nitro. Can't wait for Mugen to release a 1/12th nitro on-road car...

I wish Sanyo was still in the RC market.
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Old 11-07-2007, 01:32 PM   #27342
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Quote:
Originally Posted by jbsmith1 View Post
if you are looking into some new cells, might be worth hanging on to see how these new "Chemically Stable" Super high output cells from Orion are, when they come out in a couple of weeks...
Full article Here
yeah i'm thinking of doing that!

will be interesting to see some discharge rates on those
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Old 11-07-2007, 02:06 PM   #27343
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Quote:
Originally Posted by odpurple View Post
OK ballpark would be about 50mm
Thank you very much.
-Kane
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Old 11-07-2007, 03:10 PM   #27344
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Quote:
Originally Posted by Carl Giordano View Post
I wish Sanyo was still in the RC market.
1200mAh SCR!!!!
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Old 11-07-2007, 03:19 PM   #27345
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IMO: Mike O'Donnell is the best 1/12th builder, hands down. Check out a few photos of my Rev 4.5 brushless chassis he just finished.

For me, his building service is worth it and I look forward to his completion of my Rev 5.

Enjoy
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