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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 09-27-2005, 06:41 AM   #14611
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Quote:
Originally Posted by crimson eagle
If you are curious, it's 8awg solid copper.
Chris
why would you use solid cable? it has more resistance the stranded wire. 8 awg stranded id mucho better then 8 awg solid
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Old 09-27-2005, 07:12 AM   #14612
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Jim,

I use connectors for convenience. But voltage drop is about three things - load (we can't change that), cable size and cable length. A connector has no length, for voltage drop it's not such a big deal. i mentioned a good while ago now, i did a voltage drop test on various pieces of wire, 12g 14g and 16g, they were all 2.5 inches long and the test was at 30A.

12g vdrop = 0.09v

14g vdrop = 0.12v

16g vdrop = 0.17v

So I would ask all you, how much wire do you have in your cars and what size is it. we will allpay an extra $20 for cells with .04v extra. most of the time you can get this for free.

theisgroup,

a few reasons.

1. I don't have any stranded 8 gauge.

2. I didn't want it to move around.

3. It looks really sick.

4. Last year my car was 20g underwieght, this year i wanted to use it on something useful rather than a lead weight which does not give me anything but weight.

Chris
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Old 09-27-2005, 07:18 AM   #14613
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so based on reason 1, you are saying that it was a lazyness factor
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Old 09-27-2005, 10:44 AM   #14614
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Theisgroup,

if I had used stranded wire, the insulation would be thicker which would mean that I could not get my cells to sit down over it properly. So to get my cells over it I'd have to use smaller stranded wire which would have a higher voltage drop etc etc
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Old 09-27-2005, 10:49 AM   #14615
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i am just giving you a hard time chris.

but actually smaller guage of stranded does not necessarily product higher voltage drop. as a matter of fact, you will have less voltage drop from stranded cable, then from the same guage of solid.
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Old 09-27-2005, 10:56 AM   #14616
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The is group,

I could believe that comparison of stranded / non stranded and I may test it some day, but the important point here is the size for size issue. I don't think I could do this with the same size stranded wire, I'd have to go down in size to make it work.

I am confident that it is an improvement on 16 gauge stranded which is what I was running and I think my COG will be a fraction lower too.

Most of all however, I would never find out if I don't try and it's really easy to change back.

I'll let you know how it goes.

Chris
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Old 09-27-2005, 03:23 PM   #14617
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Hi All,

I got interested in the "skin effect" of the current travelling along the outer skin of a conductor as we have been talking about this a little so I did some research and got some interesting results. The best site I found was this one:-

http://www.allaboutcircuits.com/vol_2/chpt_3/6.html

But it basically says that in DC circuits there is no "skin effect" the whole cross sectional area can conduct electricity. The skin effect is in AC circuits and mainly at high frequencies.

This is obviously good for my 8 gauge copper wire, but it's bad for the theory of brush serrations which I had completely bought. I still think serrations work it's just now I don't know why.

Chris
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Old 09-27-2005, 03:40 PM   #14618
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Hey crimson eagle did you get my pm I have a question for ya
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Old 09-27-2005, 04:49 PM   #14619
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Quote:
Originally Posted by mike ivy
Hey crimson eagle did you get my pm I have a question for ya
You have to wait till he translates it first. You see he's British and doesn't speak our language very well
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Old 09-27-2005, 06:19 PM   #14620
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Mike,

92827 (I think)

Matt,

Thats a good one, haven't heard it put like that before.

Chris
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Old 09-27-2005, 07:03 PM   #14621
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Quote:
Originally Posted by crimson eagle
The skin effect is in AC circuits and mainly at high frequencies.
Well, our motors are DC but the current is switched at a high frequency....between 1.5 kHz to 20 KHz depending on how your speedo is set so I believe there is something to shin effect in out application. Certainly when we get to the brushless realm. BL motors are AC motors
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Old 09-27-2005, 07:12 PM   #14622
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Race my 12L4 the first time sunday.
It has CRC milled front lower suspension, crc pod plates and .050 spring steel t-bar and stock front springs.
Purple fronts and pink rears.
The problem is after a couple laps the tires "tack" up real good, it pushes worst than a 2whl buggy with a 9 turn.

I have to almost stop to get the car to turn.

Any suggestions?
Thanks
Dayton
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Old 09-27-2005, 07:44 PM   #14623
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Quote:
Originally Posted by AdrianM
Well, our motors are DC but the current is switched at a high frequency....between 1.5 kHz to 20 KHz depending on how your speedo is set so I believe there is something to shin effect in out application. Certainly when we get to the brushless realm. BL motors are AC motors

I lost my eybrows into my hairline with that one.
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Old 09-27-2005, 08:01 PM   #14624
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Quote:
Originally Posted by crimson eagle
Thats a good one, haven't heard it put like that before.

Chris
Only once or twice an hour when we pit together!
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Old 09-27-2005, 08:12 PM   #14625
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Quote:
Originally Posted by odpurple
Only once or twice an hour when we pit together!
And you guys weren't even pitted near Barry Baker at Vegas...

Who is going to Stockton on Saturday???
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