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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 09-14-2009, 07:46 PM   #32101
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Here are some fresh 1/12th scale bodies just finished to birhgten up the thread, .






Thanks
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Old 09-14-2009, 08:32 PM   #32102
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Quote:
Originally Posted by theisgroup View Post
i know that there were both smc and thunderpower in the a main in mod.



there are pics of the speedo in the prototype esc thread.
I think Hupo was running the Reedy 4600
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Old 09-14-2009, 08:35 PM   #32103
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very nice paint!
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Old 09-14-2009, 08:51 PM   #32104
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Nice Paint Jim! What brand of bodies are those?
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Old 09-14-2009, 09:04 PM   #32105
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We run on an 8th scale size track, and i had a first go at running 1S lipo. Normally with 4 cell i would run a 5.5t, i put the SMC 4900 in and dropped down to a 3.5 in the hope to get the power back. Same gearing as the 5.5 on 4 cell.

The car felt nice to drive, still a little down on power, but the biggest thing was runtime was only just over 6 minutes. Unfortunately it seems all the 1s testing has been on postage stamp indoor carpet tracks, mostly in spec classes.

Can anyone offer suggestions as to where to start to gain some extra runtime?
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Old 09-15-2009, 08:11 AM   #32106
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Hupo did run a Reedy 4600 1s lipo with his LRP X-12 4.0 motor.

Randy-We all ran the Losi 180mah lipo rx pack that goes in the micro-t. Despite the conversation going on in one of the other threads, I only charged mine once a day, it was more than enough to get me trough the two runs we had each day.
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Old 09-15-2009, 05:24 PM   #32107
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Im considering getting into running 12th scale on carpet this winter. The classes would be 13.5 or 17.5 single cell. What tire shore are most guys using with those power setups?
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Old 09-15-2009, 05:51 PM   #32108
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For my BMI w/ LiPo I am digging Black fronts and Yellow Rears.

Some dont like it because it goes counter to what you would think would work. But with many tracks standardizing on Corally Jack the Gripper traction compound, blacks work great, they dont build up like the Purples or Lilac do and fuzz over. They do tend to push a little, but thats easily remedied by chassis setup. The Yellow rears are good, but I have also had success with CRC Gray-Low's and Jaco White rears. The whites wear fast, but they give a little more stability at the end of the 8 minutes.

I will say this setup is very dependent on a good chassis configuration to make it work... A guy came to our track and started running with a different chassis and setup and couldnt make that combo work.

I have my DR set down as low as 70% and still nearly traction roll the car for the first 4 minutes of the race I have so much front and rear grip.
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Old 09-15-2009, 05:54 PM   #32109
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At the IIC I was running dbl. pink fronts and yellow rears and liked that combo. Several other drivers were running lilac fronts and yellow rears. This was for the 13.5 and 17.5 class. In mod the tire setup was completely different.
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Old 09-15-2009, 08:27 PM   #32110
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Ffejdat, they are actually for a gas 1/12th scale it looks like. I don't know much about them, but they have engine cutout lines like and 1/8th scale bodies...:/

They are going to Canada for Jeff!


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Old 09-15-2009, 09:05 PM   #32111
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Quote:
Originally Posted by InspGadgt View Post
At the IIC I was running dbl. pink fronts and yellow rears and liked that combo. Several other drivers were running lilac fronts and yellow rears. This was for the 13.5 and 17.5 class. In mod the tire setup was completely different.
what traction compound? if with jack the gripper, how did you control the front grip?
for me, if i don't sauce the majority of the tire, it gums up after 4 minutes and then it pushes worse and worse. if i sauce the majority of the front then i can't control it for the first 3-4 minutes but it finishes strong.

is there is a secret middle ground?
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Old 09-15-2009, 10:55 PM   #32112
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Quote:
Originally Posted by Besercoe View Post
We run on an 8th scale size track, and i had a first go at running 1S lipo. Normally with 4 cell i would run a 5.5t, i put the SMC 4900 in and dropped down to a 3.5 in the hope to get the power back. Same gearing as the 5.5 on 4 cell.

The car felt nice to drive, still a little down on power, but the biggest thing was runtime was only just over 6 minutes. Unfortunately it seems all the 1s testing has been on postage stamp indoor carpet tracks, mostly in spec classes.

Can anyone offer suggestions as to where to start to gain some extra runtime?
If you don't have any limitations to certain brand/size batteries, you can try getting a 6000mAh 2S saddle pack like this one and just split them in two 1S packs.
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Old 09-15-2009, 11:03 PM   #32113
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So to shift the focus from that other thread, how did the new protoform body that Dale designed work on the track at IIC? Did anyone hear of any setup changes needed because of it?
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Old 09-15-2009, 11:19 PM   #32114
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Quote:
Originally Posted by Besercoe View Post
We run on an 8th scale size track, and i had a first go at running 1S lipo. Normally with 4 cell i would run a 5.5t, i put the SMC 4900 in and dropped down to a 3.5 in the hope to get the power back. Same gearing as the 5.5 on 4 cell.

The car felt nice to drive, still a little down on power, but the biggest thing was runtime was only just over 6 minutes. Unfortunately it seems all the 1s testing has been on postage stamp indoor carpet tracks, mostly in spec classes.

Can anyone offer suggestions as to where to start to gain some extra runtime?
The USA guys can probably through a few suggestions at you but I think a lot of your testing is going to have to be done on your end. It seem like you aussies like to run on FULL 1/8th scale tracks. Years ago I ran the Trinity Shoot Out at the world famous Ranch Pit Shop. This was 1/12th only and it was on the large track but it had some extra ins and outs so we only ran on about 65% of the 1/8th track. This would solve so many issues if your track owners would do that for you electric guys.

Where you running a lipo cutoff device, are you certain you dumped, and not just got soft. How much went back into the pack the next charge.

Steve
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Old 09-15-2009, 11:50 PM   #32115
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Quote:
Originally Posted by Uga View Post
If you don't have any limitations to certain brand/size batteries, you can try getting a 6000mAh 2S saddle pack like this one and just split them in two 1S packs.
If im not mistaken those saddle packs are too tall to fit under the shell
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