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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 10-03-2003, 10:36 AM   #4246
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SANDS - moves the hinge pin farther inside

SEAN - IRS is making some new front end pieces for 1/12th scale. there is a photo a couple pages back in this thread
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Old 10-03-2003, 11:43 AM   #4247
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thanks Chrisgt2
- I am just looking for a little more from the car, The car is very comfortable to drive, but comfort does not always equal being fast, that is why the new front end is on now.

Casey
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Old 10-03-2003, 03:02 PM   #4248
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Quote:
Originally posted by fast-ho-cars
SANDS - moves the hinge pin farther inside

SEAN - IRS is making some new front end pieces for 1/12th scale. there is a photo a couple pages back in this thread
i went back a couple of pages and all i found was a link to the IRS web site. and on the web site all i found were the same castor blocks i have.
go to www.towerhobbies.com type irrgang in the search box and it will be on the second page-blue aluminum castor blocks for cars with the dynamic front suspension. i cant give you a link right to it, it wont work for some reason. are those the ones?
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Old 10-03-2003, 03:06 PM   #4249
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The current IRS offerings are for 1/10 oval cars. They do not have ractive caster options (as far as I know, need to send a note to IRS to find out.)

Try going to about page 135-137. Should be something there from what looks like a trade show.

Sands
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Old 10-03-2003, 05:42 PM   #4250
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Quote:
Originally posted by sands
The current IRS offerings are for 1/10 oval cars. They do not have ractive caster options (as far as I know, need to send a note to IRS to find out.)

Try going to about page 135-137. Should be something there from what looks like a trade show.

Sands
i must be retarded or something, did not see it still.whatever i will look again later. BTW i am currently setting up my first 1/12 car-12l3. i have never even driven one before.i was wondering if some one could give me a starting gear ratio for a 19 turn (chameleon) i have a 75 spur 17 pinion right now,will that work? also i was wondering about ride height and what axle spacers to use. with my 10l3 i had a bad spin out problem wich only went away when i gave the car a rearward rake-wich led to an understeer and pushing problem-i mean this car had NO rear traction without a rearward rake, it did not matter what tires or suspenion set up i had. is rear bite a problem with the 12l3? i will be starting with green compound tires(jaco) and running on an indoor carpet track-its a pretty big track,but only one real straight-lots of turns,tight ones. any help to get me set up right would be appreciated, i am waiting for my electronics to arrive and trying to get a head start
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Old 10-03-2003, 05:46 PM   #4251
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see page 134 post by BACHOFNER date 9-19-2003 12:09pm

there is a photo link, look real close at the front end.

yes these parts are not out yet. IRS will have them on their site way before Tower even thinks about carrying them.

i talked to Dave at IRS when i got my Rugrat Conv kit. he mentioned, that he would be coming out with a new frontend for 1/12th and the only part that was AE would be the lower arms.
he also mention he might release a complete IRS 12th Kit prior to the 12th season
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Old 10-03-2003, 07:23 PM   #4252
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Default Hi Sean

Repeat after me Purple fronts and grey Rears. that is all there is to 1/12 scale. Forget the greens, just purple fronts and grey rears.

Nice to see you are racing 1/12 scale too. Monday night I ran the 10L3 on carpet and my carpet knife. The 10L3 felt like a boat after the carpet knife. I use purple/grey. on the 1/12 scale. Just got a pair of pinks for my L30, and will let you know how they worked on blacktop after Sunday. I think they are the answer.

David Root

I am going to Racing City in South Glens falls on the day after Thanksgiving. Going to CRC some time soon too. They have an awesome indoor track. Nice guys to deal with too.
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Old 10-03-2003, 08:56 PM   #4253
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Default Re: NEW vs. OLD

Quote:
Originally posted by Chrisgt2
I run a Speedmerchant Rev. 3


MONSTER STOCK GEARING
on most tracks I run a 27/100 give or take a tooth
767 with purple spring on the + and a 769 with green spring on the -
What kind of amp draw are you using with that gearing? I am using 31 or 32 / 100 with about 5 amp draw, cut down Putnam brushes, and small tires. I will have to measure everything and get a roll-out number. The car is a little flat at the end of a run but makes time just fine.

Ted
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Old 10-03-2003, 09:18 PM   #4254
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Monster Stock gearing, I friend gave me a roll out number to start with 1.80 Anyone have a starting point a 19t C2? Thanks

Last edited by akrcracer; 10-03-2003 at 10:55 PM.
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Old 10-03-2003, 11:11 PM   #4255
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Default AMP DRAW??

Hmmmm......I dont think I can measure than with my Ear Dyno!
I do know this....you can pull 10-12 ams on the dyno.....but honestly the best running Monsters pull about 6-8 on the Fantom dyno, dont know why that is....we just did some testing

I was never one for rollout either man, too many variables. (motor always changing, tires changing, driving styles) I do what feels right for me and looks good on the lap printouts. We run some really tight tracks and it is really easy to overgear a Monster and not know it. You'll just shave some rpms off. I gear it so it sounds like a 19 turn at the end of the straight and its perfect. I Have run as high as a 30/100......but only on the big freeway tracks. Punch is a very important thing to have out of the corner.

-Chris
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Old 10-04-2003, 01:46 PM   #4256
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whats the tire of choice for 1/12? Jaco or TRC? or a some other brand?
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Old 10-04-2003, 01:57 PM   #4257
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Jaco, TRC or CRC.
__________________
Team CRC, Access Race Place, US Indoor Champs, CD SUPERPRO, RK Designs, Cypress, Founder and lead instructor of the Ian Ruggles Negative Reinforcement Driver Training Program, enroll now.....
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Old 10-04-2003, 04:39 PM   #4258
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Quote:
Originally posted by sean
whats the tire of choice for 1/12? Jaco or TRC? or a some other brand?
Tires for 12th scale is easy JACO-- purple front and grey rears.
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Old 10-04-2003, 06:01 PM   #4259
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Bobby and Ted-when are you guys coming to the gate to warm-up for the Classic?

We havea Mod Touring class now as well as a VEry competitive 12th and Sedan stock. Its like the Champs every Sunday-I kid yu not!!

Ray
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Old 10-04-2003, 08:54 PM   #4260
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Quote:
Originally posted by rayhuang
Bobby and Ted-when are you guys coming to the gate to warm-up for the Classic?

We havea Mod Touring class now as well as a VEry competitive 12th and Sedan stock. Its like the Champs every Sunday-I kid yu not!!

Ray
Ray,

Bobby is coming to the Classic, I will be out of town (again). Our inside season just started last week so we will probably stay closer to home most weekends.

Thanks for the invite!

Ted
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