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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 07-13-2006, 09:30 PM   #19306
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Quote:
Originally Posted by theisgroup
the pod is shorter. Tim and Paul both use the irs 4 post pod. to keep the same tension to the disk on top and bottom, you do need to make a change in the dampner post.
What do you have to do to the dampner post?
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Old 07-13-2006, 09:57 PM   #19307
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as apex said, you have to cut down the dampner post and compress the lower spring
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Old 07-13-2006, 10:00 PM   #19308
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Quote:
Originally Posted by theisgroup
the pod is shorter. Tim and Paul both use the irs 4 post pod. to keep the same tension to the disk on top and bottom, you do need to make a change in the dampner post.

Which Paul, and also be sure to check to see if the bulkheads are of equal height.
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Old 07-13-2006, 10:05 PM   #19309
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He's talking about a guy at our track named Paul LaPlante.
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Old 07-13-2006, 10:20 PM   #19310
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Oh, ok. Cause we both know a Paul Paras.
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Old 07-13-2006, 10:38 PM   #19311
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Quote:
Originally Posted by theisgroup
as apex said, you have to cut down the dampner post and compress the lower spring
Thanks for the info. Anyone have the length that has to be cut off or final length?

Blake
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Old 07-13-2006, 11:22 PM   #19312
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Quote:
Originally Posted by CarlosG.
Oh, ok. Cause we both know a Paul Paras.
sorry carlos, was not talking abot p2. tell clark to set a date for regionals.
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Old 07-13-2006, 11:25 PM   #19313
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Quote:
Originally Posted by dr_hfuhuhurr
Thanks for the info. Anyone have the length that has to be cut off or final length?

Blake

sorry blake, i run a bmi12. but when i saw the 4post irs pod mountedd on a chassis, there was a lot of tension on the bottom spring and the top did not even reach
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Old 07-13-2006, 11:37 PM   #19314
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does anyone have a setup thats good for med bite for a L4
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Old 07-13-2006, 11:47 PM   #19315
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Quote:
Originally Posted by protc3
i have been using the xxx w green springs with alot of success.i put a .030 verticle slot in the brush.F brushes also work good full face w/ red springs.i mostly go the xxx route though
Jason, what spur/pinion and rollout do you use the most? I know it depends on the track layout, etc. However, I am just curious as to what you typically run.
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Old 07-13-2006, 11:54 PM   #19316
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Quote:
Originally Posted by dr_hfuhuhurr
Thanks for the info. Anyone have the length that has to be cut off or final length?

Blake
Blake,

I cut the post so the top spring is 1.5mm higher than the post. You can also measure the stock setup and see how much post is below the spring, then cut the new post to match. For the bottom spring, I cut off one coil...you want very little tension on the springs. You can also stretch the springs a bit for more tension. As far as I can tell the car seems to work the same with either pod.

I'm back!
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Old 07-14-2006, 12:29 AM   #19317
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Newbie ??? for 1/12:

Why does some have receiver packs and some don't?
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Old 07-14-2006, 12:41 AM   #19318
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Quote:
Originally Posted by danjoy25
Newbie ??? for 1/12:

Why does some have receiver packs and some don't?
I've heard of people using receiver packs in some cases where they have problems with Spektrum receivers going into failsafe mode. Some ESC's have caused this to happen. I witnessed this at my local track last week where a car had to be "fished" back to the track multiple times after just taking off. Everything was attempted; capacitators, etc. Receiver packs is the best option I guess. I'm sure there are multiple reasons for people using them.
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Old 07-14-2006, 02:06 AM   #19319
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Quote:
Originally Posted by danjoy25
Newbie ??? for 1/12:

Why does some have receiver packs and some don't?
Danjoy - Andy, Denis and myself have been running 1/12th's locally to you ( at SMA and IMCC ) and so far none of us have run a receiver pack or had any issues by not running them. Equipment wise, I'm running IB3800's, Futaba 2ch 29AM receiver (R142JE), Hitech 225BB servo and an LRP Quantum Pro Sport speedy, all run with either an Orion 13x2 or an LRP 10x2 with no receiver pack and no radio issues at all. Andy is running a KO Radio with KO digital servo, QC2 or 3, same batteries and an LRP 10x2 with no radio issues either. Basically I run without one as if i don't need it, its one less thing to worry about or that can go wrong and less weight. Runtime wise, we are still left with over 1000mah out of 3800's after 8 min races and that usually includeds 4 or 5 warm up laps before everyone is gridded up, so the batts are still fairly strong voltage wise at the end of a race.

Thats just our local experience. I guess being only 4.8 volts (4 cells) in theory you could have receiver issues as the voltage runs down at the end of a race, but even Andy with the digital servo and 10x2 isn't having any probs. I think you use Feral batteries don't you? Should have no drama's with them It may vary depending on what servo and ESC you use and how much they draw. Just try it without and see what happens, you can always add an RX pack if you do have problems.

Are you thinking about getting into 1/12th? Fingers crossed the class seems to be gaining some momentum here lately The next sunday meeting at SMA there should be half a dozen of us... Come and have a run with us...
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Old 07-14-2006, 04:21 AM   #19320
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Quote:
Originally Posted by nordheim
Jason, what spur/pinion and rollout do you use the most? I know it depends on the track layout, etc. However, I am just curious as to what you typically run.

i run a 88 spur and 29 pinion w/ 1.9 inch diameter tires.
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