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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 01-05-2004, 06:49 AM   #5956
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Quote:
Originally posted by xxxgrumpxxx
Tres, Do you have a link or part number? Thanks Phil
www.teamcobra.com

www.stormerhobbies has them in stock

good luck P2
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Old 01-05-2004, 07:13 AM   #5957
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bob- Defenently! lol. You might collapse a spring every once and a while, but thats normal on any 12th scale. I can hit walls and it really doesnt mess the car up nearly as much as it would with a new style, and its much simpler.

The only "mod" I do is just to make working on it easier. Instead of using the e-clips that come with it, I take the travel limiters (the plastic sticking out of the front of the steering block) cut them off, and then drill a hole and run a set screw through it so that the set screw holds the kingpin instead of the e-clips. Also to keep the shims from catching on the grooves on the stock kingpin (for the e-clips) I just take an AE offroad hingepin or strut kingpin, and cut it down (so it is not even close to the wheel, since you dont need a wicked long one like on the strut) and flatspot it so that the set screw will really hold it. You dont have to do this at all, but its nicer to work on, IMO.
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Old 01-05-2004, 09:39 AM   #5958
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stormperson - Thanks - Sounds like the front end to run.

One more question - Will the old skool front end screw in to the same holes that the new style front end uses ?

IE - Is it a straight swap without cutting the chassis ?
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Old 01-05-2004, 10:32 AM   #5959
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Quote:
Originally posted by Bob The Builder
stormperson - Thanks - Sounds like the front end to run.

One more question - Will the old skool front end screw in to the same holes that the new style front end uses ?

IE - Is it a straight swap without cutting the chassis ?
It's a straight bolt-on. The dynamic strut was originally released as a bolt-on hop-up for the 12LW which came with the old front-end.
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Old 01-05-2004, 11:27 AM   #5960
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Quote:
Originally posted by Randman
That's cool, is it any stiffer than the blue chassis do you know?
you know going by all the talk, i am guessing that the black is stiffer, but i am not sure, worked great though
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Old 01-05-2004, 11:27 AM   #5961
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Ian-where were you and PUlfer, Delanos..... Sunday? We had a Great time-but it would have been better with you guys there!!!
Track is NICE!!!
Mo looked Darn good with the Assasin.


Question for David Lee Dave-I dont know when your coming back to the Gate-so I need to ask you this here. To run the IRS front end on my Speedmerchant Rev.3, do I need to run the servo up on mounts (at an angle) or flat? Do you have a pic of that front end on your old Rev3?

Btw-your Rugrat looked awesome in the Main.
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Old 01-05-2004, 12:04 PM   #5962
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Default Receiver Packs?

How do you wire a a receiver pack and a personal transponder to a three channel receiver?
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Old 01-05-2004, 12:12 PM   #5963
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Default Re: Receiver Packs?

Quote:
Originally posted by Ted B.
How do you wire a a receiver pack and a personal transponder to a three channel receiver?
Ted,

If you have a 3 channel reciever you can plug the reciever battery into the battery spot and the personal into the 3rd channel. You are only using the positive and negative from the 3rd channel to power the personal. The reciever pack will provide power to all 3 channels.

Brian
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Old 01-05-2004, 12:14 PM   #5964
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If this was patented a year ago.. is it available?
Does it fit on a CRC 3.2?
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Old 01-05-2004, 12:20 PM   #5965
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Brian- I was wrong about the receiver, it's a 2 channel XXL. Any thoughts???
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Old 01-05-2004, 12:24 PM   #5966
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Quote:
Originally posted by Ted B.
Brian- I was wrong about the receiver, it's a 2 channel XXL. Any thoughts???
You will probably need a Y adapter (splitter) then.

http://www.servocity.com/ServoCity/P...harnesses.html

Plug it into the Batt plug, then plug your personal into one part of the 'Y' and your receiver pack into the other part.
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Old 01-05-2004, 12:47 PM   #5967
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Quote:
Originally posted by rayhuang
Ian-where were you and PUlfer, Delanos..... Sunday? We had a Great time-but it would have been better with you guys there!!!
Track is NICE!!!
Mo looked Darn good with the Assasin.


Question for David Lee Dave-I dont know when your coming back to the Gate-so I need to ask you this here. To run the IRS front end on my Speedmerchant Rev.3, do I need to run the servo up on mounts (at an angle) or flat? Do you have a pic of that front end on your old Rev3?

Btw-your Rugrat looked awesome in the Main.
Helped Pulfer work on his new house, He wussed out on going and I'm too old to make that Road Trip by myself. I'm hoping on next weekend, if not then the following week. I really can't wait to get there.
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Old 01-05-2004, 01:35 PM   #5968
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racenut123

check your pm and mail. it is about my gt7 I've noticed you have been on this forum for the past three days and have yet to respond to my email.

Last edited by jswinkos; 01-05-2004 at 04:09 PM.
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Old 01-05-2004, 06:14 PM   #5969
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Default CRC Rear bottom pod plate

Does anyone have a line on a hobby store that currently has a CRC Rear bottom pod plate or 2 in stock. Please let me know! (grump_munoz@charter.net) I am in need!!! LHS had 2 but by the time I arrived they were gone. ANYONE

David and Stormperson Thanks for The Info, I ordered old front from calandra.

P.S. They didn't have any pod plates, They were waiting on carbon fiber.
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Old 01-05-2004, 06:18 PM   #5970
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Default 3.2 Rear Pod

I broke the rear pod on My 3.2 also Saturday. It broke where the hex ball is on the left side. The pod was not in stock at LHS but the hex balls were. The new ones are silver instead of read, Are the different???
Jeff
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