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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 11-29-2004, 04:33 PM   #9481
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Mark, Congrats! A job well done! see you in Feb....
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Old 11-29-2004, 07:30 PM   #9482
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At th Champs-one of the only changes I made all weekend was ditching my stock center shock and building up a new Silva shock with the new plastic bushing inside. I actually bought it direct from Dave who was right above us. So much smoother than my original shock and imrpoved greatly over the original Silva shock which could bind. Car felt more consistent with it and my laptimes dropped the run after installing it. I dont know if that was a fluke-but it did seem to help.
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Old 11-29-2004, 08:49 PM   #9483
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Default Re: spur gears

Quote:
Originally posted by smyka
hey guys for those of you looking for light weight spur gear try PRS they are qulity gears machined so they run true and they are light weight for those of you running large diff rings order the oval gears and for small ring people run the touring gears i have been running theise spurs gears and pinions since snow birds last year and this is what they have done for me tq'ed and won the birds tq'ed the nats and won the indoor champs all with the same gear so they last a long time
Hey Mark,

I have to agree about the PRS gears, but who is currently selling the PRS spur gears? I know RC4less has 108 and 88 tooth gears and other than that I have not been able to find any on the net.

Thanks, Mike
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Old 11-29-2004, 09:08 PM   #9484
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im currently using 48 pitch gears in my rc12l3 and theres no room for mesh adjustments. i can barely turn the motor coz it binds with the t bar. will a 64 pitch gears free it up a little bit ?
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Old 11-29-2004, 09:11 PM   #9485
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dakrat - Almost everybody runs 64 pitch in 12th. Not sure why all this 48 pitch stuff is coming from.... You can try grinding away some of the T-bar so you can get the mesh right with your 48 pitch stuff.
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Old 11-29-2004, 09:13 PM   #9486
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Quote:
Originally posted by rayhuang
At th Champs-one of the only changes I made all weekend was ditching my stock center shock and building up a new Silva shock with the new plastic bushing inside. I actually bought it direct from Dave who was right above us. So much smoother than my original shock and imrpoved greatly over the original Silva shock which could bind. Car felt more consistent with it and my laptimes dropped the run after installing it. I dont know if that was a fluke-but it did seem to help.
Ray,

Did you go with the hardcoated one? I only know IRS website sells the Silva stuff and not quite sure if they are carrying the latest Silva shock.

Besides IRS, where would I find the new Silva shock???

Dom
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Old 11-29-2004, 09:20 PM   #9487
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Default Damper tubes - springs or no springs?

What's the difference/benefits of running springs or no springs with tube cars?

Dom- How's the Monkey working for you?
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Old 11-29-2004, 09:22 PM   #9488
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Default Re: Re: spur gears

Quote:
Originally posted by Michal101
Hey Mark,

I have to agree about the PRS gears, but who is currently selling the PRS spur gears? I know RC4less has 108 and 88 tooth gears and other than that I have not been able to find any on the net.

Thanks, Mike
http://www.precisionracingsystems.com/catalog

You can go ahead and purchase them directly online. Hope this helps.
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Old 11-29-2004, 09:28 PM   #9489
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Default Re: Damper tubes - springs or no springs?

Quote:
Originally posted by stumper1
What's the difference/benefits of running springs or no springs with tube cars?

Dom- How's the Monkey working for you?
According to Bodine, with the tube springs, it just make the car transition quicker and "recover" back to center quicker. And you know Brian's stuff and thinking are all about handling and no nonsense!

The Monkey is amazing! I'm suprise not all Rain guys are running one, you guys all should! On another note, Ron Smith from R/C Plus will be running my CEFX (your old car) this weekend at Tri Cities.

Dom
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Old 11-29-2004, 09:31 PM   #9490
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Quote:
Originally posted by fatdoggy
dakrat - Almost everybody runs 64 pitch in 12th. Not sure why all this 48 pitch stuff is coming from.... You can try grinding away some of the T-bar so you can get the mesh right with your 48 pitch stuff.

will it affect the t bar's effectiveness?
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Old 11-29-2004, 09:35 PM   #9491
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Dom-
Cool. I've been thinking about trying springs in my CRC tubes. I've also been eyeballing the Monkey!!! Maybe soon

Did you ever run the CEFX? What did you think?
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Old 11-29-2004, 09:44 PM   #9492
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I'm not quite sure if the ASC front springs will fit on the CRC tubes....

Actually, I never did get to run the CEFX. I got the car from you during the gas season, so I didn't have the time to run down to Salem to run it and test it. So I let Ron have it since he owns the shop/track and had the time to test it out. He and Chad Kramer both runs it and like it a lot. Chad was stupidly fast on Saturday, on pace to break track record by 2 laps in the Main.

Dom
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Old 11-29-2004, 09:50 PM   #9493
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Dom,

Actually, Brian figured out that they fit perfectly INSIDE the CRC tubes. What size spring do you use?
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Old 11-29-2004, 09:53 PM   #9494
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Quote:
Originally posted by dakrat
will it affect the t bar's effectiveness?
Providing you only need to dremel a little away for the correct gear mesh it should be alright. If you cut alot away you will lessen it's durability.
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Old 11-29-2004, 09:55 PM   #9495
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Quote:
Originally posted by stumper1
Dom,

Actually, Brian figured out that they fit perfectly INSIDE the CRC tubes. What size spring do you use?
Thanks for posting that.
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