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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 11-15-2006, 02:28 PM   #21916
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Whats up guys, got a diff question for the experts on how to get these things dialed. I'm running the IRS diff with the lightened IRS rings. I sanded the rings to get them flat, and basically installed them with everything else stock, to break in a groove into the rings (I will be using ceramic balls and wanted to get them a little more grip on the rings) However, with the stock stuff I had a major high spot in the diff.

I'm going to be changing out everything that I used however, I bought Boca ceramic bearings and diff balls, PRS gear, and a Slapmaster thrust. Hopefully that stuff will take care of the high spot I had, but I'm just wondering if there is anything I should check for that is known to create a tight spot on the diff action?
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Old 11-15-2006, 02:33 PM   #21917
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Randy, I had a high spot once in my diff and it was due to the spacer between the hub and the thrust bearing being off. Also check the diff nut and make sure it's not crooked.

Good choice with the Slapmaster thrust bearing, it will make your diff butter!
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Old 11-15-2006, 02:36 PM   #21918
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I was kinda guessing it was the nylon nut not being perfectly flat on the spacer. Cant wait to get the Slapmaster thrust, I'm hoping it will cure my problem.
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Old 11-15-2006, 02:52 PM   #21919
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I've given up on nylon nuts sitting as flat as I want, even when I brace and thread them with a tap. I use aluminum nyloc nuts exclusively--what very little weight penalty there is is concentrated at the very center of rotation so it's effect is minimized. The key is they sit as flat as flat can be on the thrust bearing without loading one side or the other.

My nut of choice are the Niftech 5071 Low Profile Aluminum Axle Nuts, but your run-of-the-mill Associated/whatever aluminum 8-32 nyloc nuts will work.

If you INSIST on using nylon nuts AND on "threading" them by running them onto the axle, at the very least you need to remove the nut after "threading" it and use a sharp knife to remove the dimple of material that you'll find raised on the mating surface of the nut.

Oh, an 8-32 tap is under $3...works great on lower arm mount screw holes too.

Scottrik
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Old 11-15-2006, 03:03 PM   #21920
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Randy, it should be in the mail today. Seattle to Cali shouldn't take that long. I tossed it that direction as hard as I could. With all the wind and rain we're having, I am sure blew in sometime this afternoon

Take a peek at the diff ring seats on the hub and the axle to make sure a high spot is not left behind from machine work.

If all else fails, drop in a 6T and go burn a pack. It'll go away!
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Old 11-15-2006, 04:55 PM   #21921
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I'd like to get this settled before I hit the track, but if a 6 turn is what its gonna take, I'll get one ready
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Old 11-15-2006, 05:55 PM   #21922
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Quote:
Originally Posted by Slapmaster6000
Asphalt is different enough from the regular carpet that I run on. But if I had to take a guess: 24/100 with a 1.85 (47mm) tire. Timing always seems to be happy right around 10-12 degrees.

I want to give a 'holer out' to our Hawaiian racers. I just packed up an order for Tropics. The way it's been pissin' rain in Seattle, I want to hand deliver that one!

Aloha! I heard we got a mention over hear and just had to stop by and say thanks! Recieved my order last week and got to run the new thrust bearing this past friday. Man was I impressed. 1 sold allready and the others are being considered but definately everyone was impressed with how smooth my diff was using the thrust bearing. I think the rest of the racers here will pick one up from me...if not I'll put them on my site and sell them...and if they don't sell then, well I guess I'll have to build myself some more 1/12th scales! LOL

Definately great products! Thank you!
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Old 11-15-2006, 06:09 PM   #21923
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Arrow bearing

It is nice !!!!! love mine!!!!! did a mini body today match the 1/12
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1/12 forum-s4010204mini-03.jpg  
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Old 11-16-2006, 12:16 AM   #21924
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That's not a beer stain on the new black leather is it? Lookin' good... did you color out side the lines a bit?

I could so easily be in Hawaii right now. The weather guys are saying that we hit a record rain fall for the month of Nov already in Seattle... and it's the 15th of the month.
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Old 11-16-2006, 06:12 AM   #21925
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Quote:
Originally Posted by radio_car_racer
Checkpoint 10x2

tuning the motor for 12th

what's the hot ticket for these motors on IB42's
Anyone???
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Old 11-16-2006, 09:48 AM   #21926
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does anyone have a profile reccomendation for running a GT7 for 4 cell 19t racing?

I typically run an Atlas motor

Thanks
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Old 11-16-2006, 09:56 AM   #21927
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Quote:
Originally Posted by rinkrat99
does anyone have a profile reccomendation for running a GT7 for 4 cell 19t racing?

I typically run an Atlas motor

Thanks
Program 6 is specifically for 4 cells... only thing was it's 2hz, my motor didn't like that and i ended up using program 3 or 4....
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Old 11-16-2006, 10:13 AM   #21928
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Yeah my motor hated the profile 6 also. Thats why I am asking.

Why did you not choose Profile 1 or 2 or even 7?
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Old 11-16-2006, 02:17 PM   #21929
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Quote:
Originally Posted by rinkrat99
Yeah my motor hated the profile 6 also. Thats why I am asking.

Why did you not choose Profile 1 or 2 or even 7?
I didn't try those... The thing is, i was at an amazingly short track so i needed all the bottom speed i could get.. this means i went for the low frequency where my motor wouldn't do weird things
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Old 11-16-2006, 03:24 PM   #21930
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Quote:
Originally Posted by radio_car_racer
Checkpoint 10x2

tuning the motor for 12th

what's the hot ticket for these motors on IB42's

Hey Radio_Car _Racer try this setup for 1/12th scale Checkpoint Mod :

Atlas 4-cell Brush by checkpoint
Copper springs
12* Timing
gearing 28/100

Try that Bro, Hope this Helps
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