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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 01-10-2007, 04:09 PM   #23056
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Morosis, what track are you racing at? the Barn, or something down by Rochester? Always looking for new tracks...
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Old 01-10-2007, 04:37 PM   #23057
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Get to work Joe
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Old 01-10-2007, 04:40 PM   #23058
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Mike, I am at work damnit.
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Old 01-10-2007, 04:44 PM   #23059
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RC Tech isn't part of your job Joe
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Old 01-10-2007, 04:49 PM   #23060
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My Chief said its ok. I only get 1 hour a night though.
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Old 01-10-2007, 04:50 PM   #23061
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I'm sure you will watch the clock then
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Old 01-10-2007, 05:26 PM   #23062
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Quote:
Originally Posted by Mike Ellis
I'm sure you will watch the clock then
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Old 01-10-2007, 06:20 PM   #23063
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Quote:
Originally Posted by odpurple
We set our throttle so the car rolls at neutral.
Hi odpurple!

I was really interested in that point.

We do not race stock in the UK, its 19T Spec or open modified (including brushless). Our nationals are arranged as a 19T meeting on the Saturday and Modified on the Sunday. The general feeling is that "1/12th is made for modified". Part of this I am sure is due to the way the car rolls on with the reduced motor drag of a modified or brushless motor.

When you back off on a 19T there is all of this false weight transfer that happens due to the motor cogging etc. It must be worse with a stocker. I must admit that I do not understand why you would want to run these rubbish motors! Ok I agree that a 4.5 star brushless in a 12th is a handfull but the j o y of it!

That aside, your approach of running the speedo so dead stick is making the car drive forward slightly is something I should have tried a long time ago in 19T! I actually did this last weekend.... yes there is something in it.

It felt strange sitting on the start line with the stick pulled back waiting for the go. Is this what you do also? Feels clumsy getting away. You do this for finals also?

Cheers

Mark
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Old 01-10-2007, 06:22 PM   #23064
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4.5 is a handful but you should try the 3.5 talk about fast,ran it in asphalt and it was pretty good but im going to try it on carpet just for the fun of it , i know its an overkill but oh well i just hope that i dont hit any bumps or it will go airborne
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Old 01-10-2007, 06:30 PM   #23065
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Quote:
Originally Posted by Mark Payne
Hi odpurple!

I was really interested in that point.

We do not race stock in the UK, its 19T Spec or open modified (including brushless). Our nationals are arranged as a 19T meeting on the Saturday and Modified on the Sunday. The general feeling is that "1/12th is made for modified". Part of this I am sure is due to the way the car rolls on with the reduced motor drag of a modified or brushless motor.

When you back off on a 19T there is all of this false weight transfer that happens due to the motor cogging etc. It must be worse with a stocker. I must admit that I do not understand why you would want to run these rubbish motors! Ok I agree that a 4.5 star brushless in a 12th is a handfull but the j o y of it!

That aside, your approach of running the speedo so dead stick is making the car drive forward slightly is something I should have tried a long time ago in 19T! I actually did this last weekend.... yes there is something in it.

It felt strange sitting on the start line with the stick pulled back waiting for the go. Is this what you do also? Feels clumsy getting away. You do this for finals also?

Cheers

Mark


Mark,

I won't answer for OD but I can tell you that we recently started running stock 1/12 here at our local track and it seems like the racing is better. When we ran modified it seemed like the field was too spread out and there wasn't much racing going on.

I do run forward throttle when I run stock (for our regional event) and it seemed a bit clumsey but I got used to it. I had to keep the brake on until we left the line. I do this for as much corner speed as I can get. I also do it in 19t but not as much.
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Old 01-10-2007, 06:41 PM   #23066
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I noticed when I started running fwd throttle in stock, it was good for about 2 1/10ths. I also know guys that say not to do it that are really fast. It all depends on your driving style.
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Old 01-10-2007, 07:27 PM   #23067
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Quote:
Originally Posted by GrandeGixxer
I noticed when I started running fwd throttle in stock, it was good for about 2 1/10ths. I also know guys that say not to do it that are really fast. It all depends on your driving style.

Yep, driving style will dictate that. I heard a while back that it also helps the racer who lifts completely for a turn rather than a racer that lifts just a bit to keep the corner speed up.

I do it and I have found that my lap times are better with fwd roll.
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Old 01-10-2007, 07:28 PM   #23068
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Quote:
Originally Posted by Mark Payne
Hi odpurple!

I was really interested in that point.

We do not race stock in the UK, its 19T Spec or open modified (including brushless). Our nationals are arranged as a 19T meeting on the Saturday and Modified on the Sunday. The general feeling is that "1/12th is made for modified". Part of this I am sure is due to the way the car rolls on with the reduced motor drag of a modified or brushless motor.

When you back off on a 19T there is all of this false weight transfer that happens due to the motor cogging etc. It must be worse with a stocker. I must admit that I do not understand why you would want to run these rubbish motors! Ok I agree that a 4.5 star brushless in a 12th is a handfull but the j o y of it!

That aside, your approach of running the speedo so dead stick is making the car drive forward slightly is something I should have tried a long time ago in 19T! I actually did this last weekend.... yes there is something in it.

It felt strange sitting on the start line with the stick pulled back waiting for the go. Is this what you do also? Feels clumsy getting away. You do this for finals also?

Cheers

Mark
Mark,
We have seen little interest in running mod here the last few years, I never used to run stock until I was asked to by the local race track owner to help bolster entries in the 1/12th program. Now we run a lot of 19t as well as stock. I have come to enjoy stock racing because it is a challange of a different sort to keep a car rolling and hit dead perfect lines in order to be competetive; you can't save yourself with a squeeze of the throttle (cuz there's nuttin' there! )
Yes, I do sit on the grid with the brake on, you get used to it. The worst part is when you need to do something with your left hand (like scratch your...nose) I suppose it might be worse with those funny radios you guys use over there
We use this technique in stock as well as 19t; practice, qualifying and mains (finals)!
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Old 01-10-2007, 07:33 PM   #23069
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Quote:
Originally Posted by Mark Payne
Hi odpurple!

I was really interested in that point.

We do not race stock in the UK, its 19T Spec or open modified (including brushless). Our nationals are arranged as a 19T meeting on the Saturday and Modified on the Sunday. The general feeling is that "1/12th is made for modified". Part of this I am sure is due to the way the car rolls on with the reduced motor drag of a modified or brushless motor.

When you back off on a 19T there is all of this false weight transfer that happens due to the motor cogging etc. It must be worse with a stocker. I must admit that I do not understand why you would want to run these rubbish motors! Ok I agree that a 4.5 star brushless in a 12th is a handfull but the j o y of it!

That aside, your approach of running the speedo so dead stick is making the car drive forward slightly is something I should have tried a long time ago in 19T! I actually did this last weekend.... yes there is something in it.

It felt strange sitting on the start line with the stick pulled back waiting for the go. Is this what you do also? Feels clumsy getting away. You do this for finals also?

Cheers

Mark

Here in Florida we run 19T 1/12th. Most are too scared to run Mod and 27T is too slow for the tracks we run on (~140'x70').

However up North US drivers run on 60'x40' tracks (or smaller), on carpet with traction compound where you lift to half throttle for hairpins which are just the end of a 2" pipe. 27T motors seem pretty fast, 19T are REALLY fast and Mod is only for guys like Cyrul and Blackstock.

Oh and we run roll throttle (car rolls slowly at neutral trigger) all the time in 27T and 19T.
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Old 01-10-2007, 10:22 PM   #23070
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A bit off the current topic (though its a great one, much to learn from here)... But does anyone know if the standoffs for the L4 and the T-Fource are the same size? 4-40 3/4 and 4-40 1/2 ? and are the damper tubes interchangeable? thanks!
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