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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 03-30-2011, 11:55 AM   #35701
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Been using Magenta and pink combo makes the car feel good.. also Magenta and Magenta..

Has anyone tried this combo on an outdoor track? or is there a good combo which works good on an outdoor track
Las time I ran on a soda preped asphalt track XXpink all around worked well for 1s 13.5 but that was prior to the new boosted esc's.
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Old 03-30-2011, 11:59 AM   #35702
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I don't normally run asphalt but the local parking lot club had a test and tune last weekend. Since I broke my nitro car early on, I pulled out the 1/12th just for fun. Mod with magenta all around. It worked pretty darn well. I just had to be careful on the trigger as it would spin the tires and get loose if I pulled too hard. Maybe a bit more rear grip, like a pink or white and I think it would be dialed.
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Old 03-30-2011, 12:44 PM   #35703
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Originally Posted by chris moore View Post
Las time I ran on a soda preped asphalt track XXpink all around worked well for 1s 13.5 but that was prior to the new boosted esc's.
Quote:
Originally Posted by wingracer View Post
I don't normally run asphalt but the local parking lot club had a test and tune last weekend. Since I broke my nitro car early on, I pulled out the 1/12th just for fun. Mod with magenta all around. It worked pretty darn well. I just had to be careful on the trigger as it would spin the tires and get loose if I pulled too hard. Maybe a bit more rear grip, like a pink or white and I think it would be dialed.
Shalll invest in some white and some double pink
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Old 03-30-2011, 02:03 PM   #35704
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magenta is what 90% use out door at my local
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Old 03-30-2011, 02:15 PM   #35705
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It varies a lot...even on the same track. A couple years ago I was able to run double pinks all around on a sugar water treated asphalt parking lot track. Last year on the same track I had to go to magenta rear and double pink front. Now at our new track treated the same way I'm going to pink rear and double pink front.
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Old 03-30-2011, 05:00 PM   #35706
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Originally Posted by Me_MrTyson View Post
Shalll invest in some white and some double pink
I would advise against the white, that compound is very soft and will wear very fast on asphalt, even really smooth asphalt. Try XXpink or magentia first, it may take some time but once you figure a setup I think these compounds will give you the best wear and grip.
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Old 03-31-2011, 01:05 AM   #35707
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So the Turnigy Boosters I ordered from Hobbyking has arrived.

On the instructions it says one end connects to the battery and the other (output) connects to the receiver. Can I replace the battery input source with the JST plug coming from the ESC instead?

If anything goes wrong with the booster does it make a difference if I have it connected between the battery or the esc? (Any way to minimize damage to other components in case it fails?)

Thanks!

Also, is there anything bad if I use more caps on the esc instead of one? (I have a 4-cap cap bank just wondering the difference)

Last edited by rc_square24; 03-31-2011 at 01:35 AM.
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Old 03-31-2011, 06:14 AM   #35708
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Originally Posted by rc_square24 View Post
So the Turnigy Boosters I ordered from Hobbyking has arrived.

On the instructions it says one end connects to the battery and the other (output) connects to the receiver. Can I replace the battery input source with the JST plug coming from the ESC instead?

If anything goes wrong with the booster does it make a difference if I have it connected between the battery or the esc? (Any way to minimize damage to other components in case it fails?)

Thanks!

Also, is there anything bad if I use more caps on the esc instead of one? (I have a 4-cap cap bank just wondering the difference)
if you power the booster with the speedo then the speedo will not see the boosted voltage. i don't know about all esc's but for mine (tekin rs) the speedo needs to see the boosted voltage to operate. so you need to power the booster from the battery.

an old servo lead or axtension works fine, you just need to solder it to the battery posts on speedo. if you want to get fancy, hitec has a small switched extension. you just cutoff the female plug and solder it to the esc's battery posts
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Old 03-31-2011, 04:13 PM   #35709
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I have been running db/ magenta on the front and yellow on the rear, but wanted to change to something on the rear that lasts a bit longer, so went for pink rears. The problem is now it feels quite loose on entry and some times kicks out. The car is perfect with the yellows but they ware so quick.should I just stick with pink rears and try and get used to it or change to something else. I have a set of magenta rears that I could try maybe.
Any advise would be great please.
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Old 03-31-2011, 04:42 PM   #35710
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Try a lil harder front tire to balance out the loss in traction at the rear. Maybe a black, lilac, or purple front instead. Or soften up the rear suspension some.
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Old 03-31-2011, 04:52 PM   #35711
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Originally Posted by InspGadgt View Post
Try a lil harder front tire to balance out the loss in traction at the rear. Maybe a black, lilac, or purple front instead. Or soften up the rear suspension some.
Ok got some lilacs and purples sat in my tyre box doing nothing so will give them a shot.

Cheers for the help.
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Old 03-31-2011, 05:53 PM   #35712
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Originally Posted by Monkeys punk View Post
I have been running db/ magenta on the front and yellow on the rear, but wanted to change to something on the rear that lasts a bit longer, so went for pink rears. The problem is now it feels quite loose on entry and some times kicks out. The car is perfect with the yellows but they ware so quick.should I just stick with pink rears and try and get used to it or change to something else. I have a set of magenta rears that I could try maybe.
Any advise would be great please.
This is a similar issue to what happens at one of our outdoor tracks.
Pink, or any other rubber type compound do not work on the rear.

How ever, gray, orange and yellow work great, you might try gray rears for longer life and similar grip to the yellow.
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Old 03-31-2011, 06:35 PM   #35713
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Originally Posted by rc_square24 View Post
So the Turnigy Boosters I ordered from Hobbyking has arrived.

On the instructions it says one end connects to the battery and the other (output) connects to the receiver. Can I replace the battery input source with the JST plug coming from the ESC instead?

If anything goes wrong with the booster does it make a difference if I have it connected between the battery or the esc? (Any way to minimize damage to other components in case it fails?)

Thanks!

Also, is there anything bad if I use more caps on the esc instead of one? (I have a 4-cap cap bank just wondering the difference)
What ESC are you using? Some of them can not have the (+) connected to the boosted voltage (LRP Sphere), and some require it to be connected (Tekin).
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Old 03-31-2011, 11:12 PM   #35714
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Originally Posted by RedBullFiXX View Post
This is a similar issue to what happens at one of our outdoor tracks.
Pink, or any other rubber type compound do not work on the rear.

How ever, gray, orange and yellow work great, you might try gray rears for longer life and similar grip to the yellow.
Our carpet track is like that. Whites and Oranges, and Yellows are dialed, but you can't make a set of pinks work to save your life in the rear. I have always suspected the dust on the carpet, and possibly at this track the OP runs at , is the reason one family of foam works but not the other of the same shore rating.
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Old 03-31-2011, 11:18 PM   #35715
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Originally Posted by andrewdoherty View Post
Our carpet track is like that. Whites and Oranges, and Yellows are dialed, but you can't make a set of pinks work to save your life in the rear. I have always suspected the dust on the carpet, and possibly at this track the OP runs at , is the reason one family of foam works but not the other of the same shore rating.
One of the guys I run with has been experimenting with Pink rears also with mixed results on dusty carpet(right next to an indoor off-road track). His thinking is that while the pinks are a touch more slippery; if/when you get off line into the heavy dust the pinks "clean" themselfs off faster than yellow or orange's seem to due to the different level of natural rubber in them.
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