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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 12-19-2014, 01:32 PM   #41836
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Nice Video!
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Old 12-26-2014, 01:22 AM   #41837
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Decided to give futaba servos a try in my 1/12th. I've been a Savox user for all my vehicles and thought it was time to upgrade. I ended up getting Futaba BLS671SV S Bus.2 servo for a a really good deal. Hopefully this will improve the steering department of my 1/12th.
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Old 12-27-2014, 04:21 PM   #41838
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Default Guess it's time.

We'll after about a year of building and messing around I guess I am finally ready to try racing again. Let'er rip tater chip!
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Old 12-28-2014, 12:04 AM   #41839
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Quote:
Originally Posted by NCOHOG View Post
We'll after about a year of building and messing around I guess I am finally ready to try racing again. Let'er rip tater chip!
Interesting build
well done
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Old 12-28-2014, 12:58 AM   #41840
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Question for pro's:

- what are the advantages of a roll shock VS side damper tube?

I was told by D. Spashett the damper tube are a bit more precise but they loose their consistancy all over the run. Any idea about this?
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Old 12-28-2014, 03:46 AM   #41841
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Can anyone give me a source of the square ball mounting things... usually held together by 4 little screws?

Bit like this -
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Old 12-28-2014, 05:21 AM   #41842
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Roll over antenna or not. That is the question...
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Old 12-28-2014, 09:55 AM   #41843
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Thanks redbullfixx

It started as a 12R5.2 then I made the parts to change what I didn't like. I don't know if I made it better or worse but at least I like it now
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Old 12-28-2014, 10:04 AM   #41844
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Quote:
Originally Posted by EDWARD2003 View Post
Roll over antenna or not. That is the question...
If your racing against a bunch of jam cars go for it, if you have clean racers dont use it.
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Old 12-28-2014, 10:14 AM   #41845
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Quote:
Originally Posted by ShadowAu View Post
Can anyone give me a source of the square ball mounting things... usually held together by 4 little screws?

Bit like this -
Here

http://www.teamcrc.com/crc/modules.p...prodID=7718871
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Old 12-28-2014, 12:09 PM   #41846
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.

Last edited by Josh Keller; 12-28-2014 at 03:46 PM.
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Old 12-28-2014, 12:31 PM   #41847
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Does anyone have the instructions for the Slapmastertools Thrust Bearing Kit? I can't remember which way the washers are supposed to face the thrust bearing, grooved or flat?[/QUOTE]

The grooves face the bearing on both sides, the Delrin spacer also has a lip on one side, that faces the bearing in the hub.
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Old 12-28-2014, 12:55 PM   #41848
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Quote:
Originally Posted by G-rem View Post
Question for pro's:

- what are the advantages of a roll shock VS side damper tube?

I was told by D. Spashett the damper tube are a bit more precise but they loose their consistancy all over the run. Any idea about this?
David is a friend and I have told him this number of times... (!)

A side shock has friction and it has 'pack'. Pack is when the the shock is asked to move, but doesn't because the initial movement is the piston against a 'wall' of fluid which resists the initial roll. It is worse when you increase the weight of the oil.

Friction is between the piston rod, the o rings and the plastic guides that hold it all in a straight line.

Side dampers have virtually no inertia and no 'pack'. The oil is 'sheared' by the action of the movement of the piston in the cylinder and there is no resistance to it compared to the initial 'pack' of the side damper. There is no friction between the piston and the cylinder - the piston is held in place by the oil.

David always takes a side damper and moves it in and out a lot to show how it loses its effect. However, in the car, the damper never moves more than 2mm or 3mm and it never rotates. If you do that it will not lose any effect after 20 minutes of fiddling with it, let alone 8 minutes of racing.

In practice most top drivers find that they can run three or four races before rebuilding the side tubes.

The side tubes are easier to tune using the wide range of oils available. Side shocks are more difficult to tune as eventually that suffer from 'pack' as the oils get heavier. Side shocks need new o rings every rebuild as the o rings expand over time.

David may love his side shocks, but all the other top drivers in the UK use tube dampers and they have tried both in many cases. AE went from their side shock
to side dampers, and every other manufacturer sells side dampers. The reasons for this are as described above. HTH

Quote:
Originally Posted by EDWARD2003 View Post
Roll over antenna or not. That is the question...
Always an antenna. No antenna means the car goes upside down, skids at unabated speed across the track, jumps the lane barriers and usually ends up broken as it hits the walls or other cars.

For me it is a safety issue - I don't want to be hit by a car skidding across the track into me when I am marshalling. It's happened twice and it hurts! Our (BRCA) rules now make a roll-over antenna mandatory with a minimum length of 150mm from the ground. HTH
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Old 12-28-2014, 01:02 PM   #41849
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Hey Josh,

Here's a more visual of how the thrust bearing goes together.
Hope this helps.









Quote:
Originally Posted by Josh Keller View Post
Just thought I would bump this question...I would like to hear some opinions as well.

Does anyone have the instructions for the Slapmastertools Thrust Bearing Kit? I can't remember which way the washers are supposed to face the thrust bearing, grooved or flat?
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Old 12-28-2014, 01:03 PM   #41850
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Quote:
Originally Posted by EDWARD2003 View Post
Roll over antenna or not. That is the question...
Hi,

If you decide to race with, let the antenna cable inside the body it's safer.
I had it on today was hit by a flying car broke my antenna and spripped the antenna cable race over.

Claude
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