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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 09-26-2005, 10:51 AM   #14596
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Quote:
Originally Posted by AdrianM
Actually, with your servo mounted flat 1/12th cars have terrible bump toe-in. you need to mount you ball studs as far in as possible on your servo saver and use long offset or lots of washers under your ball studs on you steering spindles to correct for this.

So you are trying to get the turnbuckles straight across, is this why you would put a bunch of washers under the ball stud??

Thanks!
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Old 09-26-2005, 10:56 AM   #14597
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Quote:
Originally Posted by scoobydo
Yikes, I just bought some Parmas for my L4 but haven't opened them.
What size Flanged bearings does it use? Also, do I need to shim the Parmas or just the TRC's?
You will need 1/8" x 5/16" Flanged bearings for the TRC or the Parma tires. The Jaco tires use the unflanged bearings.

The Parma wheel offset is exactly the same as the TRC's.
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Old 09-26-2005, 10:56 AM   #14598
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Adrian, please explain further. 12th scale doesn't encounter bumps like an offroad vehicle would. Our bumpsteer is minimal at best. You are saying our bumpersteer gives a toe in. I could see that during a turn, the outside front suspension compresses a little causing the tire to turn in a little more, but that would feel nearly the same every time.

BTW, have you found any servo mounts that will work for mounting flat? I really don't want to use servo tape and/or superglue.
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Old 09-26-2005, 11:00 AM   #14599
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Quote:
Originally Posted by Katana Man
BTW, have you found any servo mounts that will work for mounting flat? I really don't want to use servo tape and/or superglue.
You can use one of the servo mounts from a TC3 with a little help from a dremel... This method will require you to drill a hole in the chassis and countersink it. Also, due to the location of the servo between the suspension blocks, you will only be able to use one set of ears on the servo case.
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Old 09-26-2005, 12:54 PM   #14600
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Default BMI Announces the BMI-12A

The BMI-12A is an asphalt optimized version of BMI's successful 1/12th carpet conversion.

Features:

.078" chassis with lightening holes to reduce stiffness for asphalt.
The narrowest possible chassis for fast transitions.
Long cell slots for weight distribution adjustments.
Pod Top plates for Damper Tubes or Damper Plates are both included
BMI Damper plate center tube and all standoff included.
Counter sunk 2-56 screws for the pod top plate to lighten it up and for lower body mounting.
New lowered axle pod side plates.
Motor wire port in the left pod plate.

It's light, its fast and it sticks to asphalt like a scared cat on shag carpet
Attached Thumbnails
1/12 forum-bmi-12a-1-sm.jpg   1/12 forum-bmi-12a-2-sm.jpg   1/12 forum-bmi-12a-3-sm.jpg   1/12 forum-bmi-12a-5-sm.jpg   1/12 forum-bmi-12a-pod-sm.jpg  

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What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
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Old 09-26-2005, 12:59 PM   #14601
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Here are some bare chassis shots...

The chassis shots show the damper plate top plate and the BMI center tube.

Note that the chassis come out of the bag finished...no beveling or rounding is necessary....just CA the edges.
Attached Thumbnails
1/12 forum-chassis-1sm.jpg   1/12 forum-chassis-2-sm.jpg   1/12 forum-plate-pod-2-sm.jpg   1/12 forum-plate-pod-sm.jpg   1/12 forum-bmi-damper-post-sm.jpg  

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What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
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Old 09-26-2005, 05:31 PM   #14602
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Is that the "new" car you were running Sunday? It seemed to be running good, but what happened in the main, you had 2nd then I did..... Then you came back not sure sure where you ended up but it was sure hard to keep up with in the qualifiers.

One more question how is it you can fit a 37t pinion in your car? I can fit a 33 maybe 34 max and that is after shaving the t-bar down for more clearance.... You are running a 96t spur right....
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Old 09-26-2005, 08:14 PM   #14603
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I was experimenting with tire sauce and it ...uh...didn't work out. Vasaline on the rear tires would have been better. I pretty much wasted the entire day.

After the race I ran two more packs through it with the right sauce and it was just as good or better than my Hyperdrive. It seemed better in the chicanes.
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What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
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Old 09-26-2005, 11:12 PM   #14604
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Hi all,

a couple of pics on my new carpet car for this year's rug season, I'm trying something a little different. If you are curious, it's 8awg solid copper.

I still have work on some of the wiring and electronis positioning left to do

Chris
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Old 09-26-2005, 11:22 PM   #14605
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Hey I was wondering if anyone knew any good places or brands of 14 gauge wire, or maybe 16 gauge? I only run stock, I just want some good flexible stuff to make the car tweak more consistantly.
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Old 09-26-2005, 11:27 PM   #14606
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Castle creations has great 16 gauge wire.
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Old 09-26-2005, 11:55 PM   #14607
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Quote:
Originally Posted by crimson eagle
Hi all,

a couple of pics on my new carpet car for this year's rug season, I'm trying something a little different. If you are curious, it's 8awg solid copper.

I still have work on some of the wiring and electronis positioning left to do

Chris
Chris,
Just got back from the IIC, and saw the shots of your new car.
You are one sick puppy.
O'D
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Old 09-27-2005, 01:58 AM   #14608
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Quote:
Originally Posted by crimson eagle
Hi all,

a couple of pics on my new carpet car for this year's rug season, I'm trying something a little different. If you are curious, it's 8awg solid copper.

I still have work on some of the wiring and electronis positioning left to do

Chris
Wow , I agree that is very sick. It's sick in a very cool way . And I thought 12awg was too big lol.
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Old 09-27-2005, 02:33 AM   #14609
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C.E.

You go to all that work for lower resistance and your still using connectors??????????
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Old 09-27-2005, 06:28 AM   #14610
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Hey all...Need some gearing help! I'm new to 1/12th and have NO IDEA where to start or target for gearing. Will be running Monster Stocks and Quad Mag 19t with a Corally SP12M on carpet. 1 Track is large and flowing, the other is short and tight. 4 cell, 8 minutes...Can someone point me in a direction? Some basic ratio's would be a huge help.
Thanks!
Joe
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