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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 05-19-2009, 06:43 PM   #31411
avs
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A 1s pack is really 2 cells in parallel, not in series. If the cells were in series the voltage would be 7.4 not 3.7.
fyi, the 1s indicates the number of cells in series. there are some battery packs that have a configuration defined as XsYp, X cells in series and Y cells in parallel.

the # of cells in series sets the voltage and need to be balanced while the cells in parallel set capacity and are balanced automatically (2 cells in parallel see the same voltage during charge and discharge)
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Old 05-19-2009, 07:54 PM   #31412
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fyi, the 1s indicates the number of cells in series. there are some battery packs that have a configuration defined as XsYp, X cells in series and Y cells in parallel.

the # of cells in series sets the voltage and need to be balanced while the cells in parallel set capacity and are balanced automatically (2 cells in parallel see the same voltage during charge and discharge)
I completely understand that but since this is a 1/12 scale thread I assumed we were talking about the only 1s pack used in our cars. It is a 2 cell pack in parallel not series to double the capactiy not the voltage.
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Old 05-19-2009, 08:03 PM   #31413
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A 1s pack is really 2 cells in parallel, not in series. If the cells were in series the voltage would be 7.4 not 3.7.
Your right my bad.
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Old 05-19-2009, 09:00 PM   #31414
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Hey Yang, Chris-
I don't want to get in the middle of your "discussion" but for what it is worth, in the testing we have done here the guys seem to agree that single cell 13.5 is faster that 4 cell 17.5.

It's a moot point, the two are not compatible and shouldn't be run together, IMO. Whether we choose it, or it is just being forced on us, single cell will be the class going forward
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Old 05-19-2009, 11:10 PM   #31415
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Hey Yang, Chris-
I don't want to get in the middle of your "discussion" but for what it is worth, in the testing we have done here the guys seem to agree that single cell 13.5 is faster that 4 cell 17.5.

It's a moot point, the two are not compatible and shouldn't be run together, IMO. Whether we choose it, or it is just being forced on us, single cell will be the class going forward
Hmm... you'd think that more people would see that difference and we'd not have the unnecessary but good for the soul discussions
E
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Old 05-20-2009, 12:24 AM   #31416
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Originally Posted by odpurple View Post
Hey Yang, Chris-
I don't want to get in the middle of your "discussion" but for what it is worth, in the testing we have done here the guys seem to agree that single cell 13.5 is faster that 4 cell 17.5.
Hey Michael,

Was this testing done at the same weight (865g or thereabout) or were the LiPo cars being allowed to take advantage of weight savings?

Thanks,

Scottrik
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Old 05-20-2009, 12:44 AM   #31417
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Hi Guys,

13.5 Lipo is about 2-3 tenths quicker than 4-cell 17.5. That's with the Lipo car at 730 grams and the 4-cell at 865.

When we first started testing, it seemed like they were pretty even, but as we've tweaked on the Lipo cars (both electronically & chassis set-ups), they are definitely quicker than 17.5 4-cell now.
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Old 05-20-2009, 01:14 AM   #31418
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Originally Posted by Scottrik View Post
Hey Michael,

Was this testing done at the same weight (865g or thereabout) or were the LiPo cars being allowed to take advantage of weight savings?

Thanks,

Scottrik
No, we didn't want to put a cinder block on the lipo car, there would be no point in that. The lipo cars were less than 730g, the 4 cell was less than 865g, but both were in their respective ballparks. Personally, I like my 4 cell car, but that is not reality, 1 cell will be the new standard.

Out here we race 1/12th outdoors on parking lot tracks a lot with low bite during the summer. T bar cars are what we like for these conditions, so a 1cell set up will be tested. I would hate to relegate 1/12th racing to indoor carpet only, my first tests with 1 cell would indicate that it will be great on our parking lot tracks also
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Old 05-20-2009, 01:21 AM   #31419
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(originally directed at SpeedMerchant, but Michael chimed in while I was "writing")

Yes, but it really seems like you're comparing apples with oranges with that much weight disparity. Would adding 135g to the LiPo cars weight bring the lap times back to more or less parity? I fully acknowledge that adding weight gives up a lot of the "nice things" going to lighter LiPo cars gains (livelier feel, less tire wear, "softer" impacts, etc) but many of us are looking at CAN there be reasonable parity AT THE CLUB LEVEL for the transitional period?

What (very) little "testing" (and it really is notable only for a) it's absolute brevity and b) didn't "explore" much beyond what an undergeared LiPo 13.5 car would do against a well-driven, well-sorted 4-cell 17.5) gives me hope that we can find that here but we plan to schedule a couple real live test sessions before making any sort of decisions for our next season.
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Old 05-20-2009, 01:22 AM   #31420
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Hmm... you'd think that more people would see that difference and we'd not have the unnecessary but good for the soul discussions
E
Hey Eric,

True, you are so right, but good for the soul is, well, good for the soul, yes?
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Old 05-20-2009, 01:31 AM   #31421
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Originally Posted by Scottrik View Post
(originally directed at SpeedMerchant, but Michael chimed in while I was "writing")

Yes, but it really seems like you're comparing apples with oranges with that much weight disparity. Would adding 135g to the LiPo cars weight bring the lap times back to more or less parity? I fully acknowledge that adding weight gives up a lot of the "nice things" going to lighter LiPo cars gains (livelier feel, less tire wear, "softer" impacts, etc) but many of us are looking at CAN there be reasonable parity AT THE CLUB LEVEL for the transitional period?

What (very) little "testing" (and it really is notable only for a) it's absolute brevity and b) didn't "explore" much beyond what an undergeared LiPo 13.5 car would do against a well-driven, well-sorted 4-cell 17.5) gives me hope that we can find that here but we plan to schedule a couple real live test sessions before making any sort of decisions for our next season.
Agreed, but the lipo car is what it is, and the 4 cell the same. There are more issues than just the weight disparity. I wouldn't argue with anyone trying to find parity during the transitional period, but I don't think that it will last very long (the transitional period) the way things are going.
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Old 05-20-2009, 01:35 AM   #31422
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I don't think that it will last very long (the transitional period) the way things are going.
Agreed...my thought is the "transitional period", at least at the national level, will pretty much be over Dec. 31. I'm pretty sure 2009 will see the last National-level races with brushed motors and I'll not be surprised at all if the last round cells are seen this year as well. ROAR have made provisions for both classes (round cell and LiPo, and as separate classes) in the rules for next year, but I think most can see the writing on the wall.
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Old 05-20-2009, 01:39 AM   #31423
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Originally Posted by Scottrik View Post
Agreed...my thought is the "transitional period", at least at the national level, will pretty much be over Dec. 31. I'm pretty sure 2009 will see the last National-level races with brushed motors and I'll not be surprised at all if the last round cells are seen this year as well. ROAR have made provisions for both classes (round cell and LiPo, and as separate classes) in the rules for next year, but I think most can see the writing on the wall.
yes
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Old 05-20-2009, 06:24 AM   #31424
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at our club it seams that the transition is happening pretty quick. in the last 2 months we went from all 4 cell cars to this past weekend we had 15 pan cars and only me running a 4 cell in stock. and that is because I could not find another pack anywhere before the weekend.

I think the tracks with low turnout will transition faster because well, there are less people with round cells. and it brings people back out to race to see what the hype is all about. for the seasoned tracks with lots of pan car drivers, the transition maybe a little slow. our club has descided that we will run motor for motor and eventually all the racers will be on the same power plant. so I think this past weekend will be our last test of round cells to lipo. at one point we thought about running separate classes. But in reallity the guys that go to the big races were the only ones that were holding on to the round cells. now that ROAR and IIC have gone lipo, that transition happened the night scotty posted the IIC rules. Or at least that is what it seams like.

one thing I did notice was the line for the round cell and the line for the lipo cars were completely different. so even if you find a partity with lap times, how a racer attacks a corner will be different and may make for more disparity then parity on the track.
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Old 05-20-2009, 06:27 AM   #31425
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Originally Posted by odpurple View Post
Hey Yang, Chris-
I don't want to get in the middle of your "discussion" but for what it is worth, in the testing we have done here the guys seem to agree that single cell 13.5 is faster that 4 cell 17.5.

It's a moot point, the two are not compatible and shouldn't be run together, IMO. Whether we choose it, or it is just being forced on us, single cell will be the class going forward
+1

But what do you know?
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