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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 10-13-2004, 12:06 AM   #8821
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Default crc3.1 front bearings

anyone know what size the front wheel bearings are for a crc3.1?

also am I correct in thinking jaco foams use standard and trc foams use flanged bearings?

thanks.
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Old 10-13-2004, 12:13 AM   #8822
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1/8 x 5/16

Flanged for TRC
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Old 10-13-2004, 01:14 AM   #8823
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Quote:
Originally posted by stumper1
1/8 x 5/16

Flanged for TRC
thanks.....
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Old 10-13-2004, 06:43 AM   #8824
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Quote:
Originally posted by davepull
hands down the best tape to use is 3m fiberglass renforce strapping tape in is like 5/8 wide and I buy it at home depot in the paint section
thank you DAVE !!!
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Old 10-13-2004, 08:08 AM   #8825
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Hey 12L4 drivers,

Check out the for sale area here for the chassis that Paul Ciccarello, myself, Jones and RIce used for the Halloween Classic.

Do a search on rayhuang in the for sale thread and it should come right up.

Ray
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Old 10-14-2004, 02:08 AM   #8826
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Default Re: Tire & motor questions

Quote:
Originally posted by Blue Sky
Hi all, wonder if you can help with some of the following questions:

1. What size front and rear should I true the tires to for racing?

2. I usually use purple front and grey rear. What will happen if I use magenta fronts?

3. I will be running 19T motor. I have the Chameleon and Reed Quad mag. Which one would be better and what roll-out/gear ratio should I start at?

Thanks a bunch.
Blue Sky I was going to post those same questions myself tonight. I think I am going to go back up to a 19 turn for awhile until I improve in mod. The 11 turn is to powerful for me. Can anyone answer the question above we would appreciate your help. Thanks
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Old 10-14-2004, 07:00 AM   #8827
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cut your tires down to 1.800 front and 1.900 rear. If you put magenta fronts on it will give the car mores steering as for the motor I couldn't tell yah .
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Old 10-14-2004, 07:45 AM   #8828
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Blue sky...
On my BMI chassis I ran 1.75" diameter front and rear at the Holloween Classic at a high bite track... that gave me 3mm clearance front and 3 1/4mm clearance rear. I run purple fronts and grey rears, for me the magenta fronts gave a push to the car, but it was consistant, the purples heat up and get stickier as the race goes on and gives more bite. I don't know anything about the motors...

Wayne
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Old 10-14-2004, 11:10 AM   #8829
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Hey Blue Sky last year I ran my chamelon between 94/31 to 33 turned my best laps geared at 94/32 and was able to run pretty close with the mod guys who ran 56 laps. Good thing I keep notes on each race or I would have never remembered this. I couldn't figure out the Reedy but now I know I need to gear up so I am going to try that out next week.
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Old 10-14-2004, 11:25 AM   #8830
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Hey thanks all for your answer. They're all good.

11, I'm racing 1/12 this weekend in Canada and they're using 19T. That's the reason I asked. Yeah, maybe I should jog down the good info too. Thanks again.

I'll be practicing at the Rain tonight. Probably be a while before I hit the Rain again. Tried FW last Sun and was a blast with the gas sedan. Probably will do again after this wkend.
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Old 10-14-2004, 01:51 PM   #8831
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Default 4 Cell Maintenence?

Ok...what are you guys doing to maintain your cells? Charge/Discharge/tray, etc? What order and what products/Settings do you use along the way.

Thanks,
Blake
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Old 10-14-2004, 07:43 PM   #8832
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1-I discharge them a night before to .9 per cell with a NovaK Smart tray to let them cool down and match drain them.
2-Race day I charge them up
3-Race them
4-I will give them a couple minutes of charge after I run them just to store them.
5-I then go back to #1 for the next time.

If you race weekly, this is a good routine for me.
If you store your batteries longer, you may have to charge and equalize them a couple of times to get the max out of them.
As far as charge rate, thats also up to you. No more than 5A I would say for 3300's.

This works for me. However, everybody is different.
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Old 10-14-2004, 08:31 PM   #8833
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im new at 12th scale and having some trouble with my crc bloody knife .it dont track strait it will pull left then pull right then not its wierd someone said it is my servo but it seems to work perfectly

do i need to buy a fancy digatal servo to fix it or can i try somthing else
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Old 10-14-2004, 08:34 PM   #8834
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Quote:
Originally posted by cain921
im new at 12th scale and having some trouble with my crc bloody knife .it dont track strait it will pull left then pull right then not its wierd someone said it is my servo but it seems to work perfectly

do i need to buy a fancy digatal servo to fix it or can i try somthing else
I had the EXACT same problem last two weeks. Was getting really mad about it. Turns out-I was running a plastic gear servo for the first time-ever (JR3550) and I tightened the servo saver on too tight. Like I wold for my metal geared servos.

Try loosening it and see if your problems go away. It worked charms for me.

Ray
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Old 10-14-2004, 08:35 PM   #8835
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OH-also-the servo feels no different on the bench with it tight or just snug, but you'll know immediately on the track if it is solved.
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