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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 12-12-2003, 09:14 PM   #5551
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Mike D, are those the IRS extended pod plates or the regular ones?
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Old 12-12-2003, 09:42 PM   #5552
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Conversion kit for $164?

Geesh... You can get a full car kit with wheels, tires, axle, bearings, front end and pod plates for $160. Assc 12L3, CRC Six Pack or Carpet Knife sell for about that much... seems that the Rug Rat is way over priced.
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Old 12-12-2003, 10:02 PM   #5553
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Quote:
Originally posted by Kraig
Mike D, are those the IRS extended pod plates or the regular ones?
Kraig - Those are the standard IRS pod plates. They are lowered .090" more then the stock associated geometry so you can use smaller tires and not run out of rear hide height adjustment room. I think the extended wheelbase plates are intended more for oval... I haven't heard of any road course guys using them.
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Old 12-12-2003, 10:25 PM   #5554
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Quote:
Originally posted by Junkie
Conversion kit for $164?

Geesh... You can get a full car kit with wheels, tires, axle, bearings, front end and pod plates for $160. Assc 12L3, CRC Six Pack or Carpet Knife sell for about that much... seems that the Rug Rat is way over priced.
https://www.ssl-stormerhobbies.com/c....pl?pn=IRS4000
https://www.ssl-stormerhobbies.com/c...l?pn=IRS4000BL

It's cheaper here.
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Old 12-12-2003, 10:44 PM   #5555
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Too bad the black kit is out of stock at stormer. At least the blue kit is still in stock. $119.95 is a decent price. I might just pick one of these up for myself after christmas.
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Old 12-12-2003, 10:49 PM   #5556
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Default trinity reflex 12

Hey guys, what can you tell me about the trinity reflex 12? I looks like a good car, but is it?
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Old 12-13-2003, 06:52 AM   #5557
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Quote:
Originally posted by racenut123
Well,being that our track is run on county property,we can only run Tq "orange" becuase of the smell the carpet would have in the storage area and the fact the county doesnt want the wintergreen smell in the building where the carpet is laid.they use the exhibit hall for other events.We are running on the same carpet going on the 2rd season and all we have used is Tq orange.Personally no complaints in regard to degredation of the carpet.We run Fainfair so I dont know if that makes a difference.
It dries out fairly quickly but if alot of people run on it the grip goes through the roof.The track owner is pretty anal about people wiping off tires thoroughly before putting down so any excess is either on a burnout mat or wiped off at your pit.As of now I see no reason to run Paragon as everyone at the track runs the same stuff.And I mean everybody.We know that paragon works better,but what can we do.Jack the gripper is pretty wicked stuff
Since you guys actually roll the carpet up there's probably more opportunity for it to escape the carpet. Permanent tracks that are laid directly on concrete are the most susceptible to degradation from TQ.
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Old 12-13-2003, 08:42 AM   #5558
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Default Hello!!!

Hello from Manila! Just happy that 1/12th will be back here in 2004, A new tracks is popping out here beside a Big Mall that is Good for 1/12th and our old Home track will be re-asphalted!!! Good things to come this 2004!

Here is a pic of the coming track.
http://www.rctech.net/forum/attachme...?postid=625489

tracks has been tested for smoothness, a mini-z going around the track with out twitching a bit, which is good for 1/12th!!!!

Which leads me to my question: what is the ideal tire for asphalt for my 12L3. Weather here is like Florida, texas and very humid.

Thanks!!

Lem
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Old 12-13-2003, 09:06 AM   #5559
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Default RE: Stronger Servo Saver

Thanks Dave, Greg and Mike D for the info.
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Old 12-13-2003, 09:12 AM   #5560
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foam tires are not really that sensitive to heat (unlike rubber tires). Normally on asphault guys run purple fronts (i think) and and pink rears. Although I would mess with other tires as well, also try TRC granites rears, or possibly double pink fronts or cyan fronts.
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Old 12-13-2003, 09:39 AM   #5561
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Quote:
Originally posted by stormperson
foam tires are not really that sensitive to heat (unlike rubber tires). Normally on asphault guys run purple fronts (i think) and and pink rears. Although I would mess with other tires as well, also try TRC granites rears, or possibly double pink fronts or cyan fronts.
Thank You Very Much!!!
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Old 12-13-2003, 12:22 PM   #5562
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Default Re: Minimum tire size?

Quote:
Originally posted by P2
When do 12th scale tires become too small?? 1.70" front and 1.80" rear?? How low do you go??
P2
I have run the to 1.575 rear in practice but you have to run a 96 spur because the 100 spur is 1.589 or something like that and the 96 is 1.537. the traction goes away pretty bad down there but the car is driveable with stock. I was running a 9x2 TI I was using every tire I could find to wear to practice with before going to cleveland this year. I would say that anything below 1.65 though you wouldn't want to use in a race. plus I wasn't held to any ride height. 3mm is standard rules. I think I was a bit lower.

speaking of does anybody have the distance of the associated ride height adaptors and what each one changes it to? given the size of your tire someone should be able to make a chart of tire size and adjuster and a 3mm ride height minimum taken into count the .090 on the IRS, Niftech and CRC lowering pods if you use those also.
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Old 12-13-2003, 03:39 PM   #5563
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Default Re: trinity reflex 12

Quote:
Originally posted by picco007
Hey guys, what can you tell me about the trinity reflex 12? I looks like a good car, but is it?
Picco007,

12L3 baby......32 laps !!!!!!

Seriously the Trinity reflex 12 looks promising but is a little more work setting it up.

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Old 12-13-2003, 10:00 PM   #5564
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Robert I swapped some and checked the ride height and if I remember correctly it was right at 1.5mm. The front washers are 1.6mm
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Old 12-14-2003, 05:23 AM   #5565
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Quote:
Originally posted by Mike D
lowbugit - and the blue IRS front end too...
That front-end is trick.

I have a question... do any of you guys run the hard anodized aluminum pivot balls in your front end? I know the oval guys do, was wondering if these were less prone to slop.

Thanks!
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