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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 03-08-2004, 04:59 PM   #7051
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OK cool just trying to get a feel for what yall have before I get down their for the nats.I run at The Track in Gaithersburg Md so looks like I might be trying to remove traction when I get up your way
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Old 03-08-2004, 06:27 PM   #7052
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Default Roll Out ??????

What is the formula for figuring roll out on a 1/12 pan car (RC12L3)? Also I'm running a monster pro stock. I heard that 1.6-1.8 is where I want to be. True or not?
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Old 03-08-2004, 06:33 PM   #7053
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tire diameter x pinion x pi (pie, 3.14.....) all divided by spur

ex.

1 inch x 10T x 3.14 = 31.4/100 spur = .314
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Old 03-08-2004, 06:54 PM   #7054
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Quote:
Originally posted by serpentracer1
OK cool just trying to get a feel for what yall have before I get down their for the nats.I run at The Track in Gaithersburg Md so looks like I might be trying to remove traction when I get up your way

HMmmmmm-cannot say for sure on that-but like any big race-I am sure the traction is gonna be intense!!!!
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Old 03-08-2004, 08:50 PM   #7055
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Ray, I ran at The Gate last Sunday and can say that we haven't come close to the traction level that we will experience at the Nats. Setups at this point only help you know that your car functions. It will be back to the same stuff we saw at the Indoor Champs during this Nationals. See, there isn't enough running on the carpet during the week to do anything. It takes till 10:30 in the morning on Sunday for the faintest line to show on the track. The next few weeks will have Saturday as well as Thursday and Sunday activity so things will pickup quite a bit.
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Old 03-09-2004, 12:53 AM   #7056
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Rev.2/3 Conversion to New Rev.4

http://www.teamspeedmerchant.com/sho...l/smr1406.html
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Old 03-09-2004, 02:14 AM   #7057
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Just ordered one. Hope it gets here by the weekend!!!
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Old 03-09-2004, 06:30 AM   #7058
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If anyone needs any set up advice or help with their Rev. 4, either post it on this forum or send me an email at stormperson@hotmail.com....
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Old 03-09-2004, 07:50 AM   #7059
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Storm - I have one. You just dropped your setup from the Rev 3 onto the rev 4 chassis, right? What about servo position with the old front end? Did you mount it flat on the chassis? Also, what angle are the tie-rods at?

I'm building mine this week and going to try and get a JR servo, and want to mount it right... =)
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Old 03-09-2004, 09:59 AM   #7060
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The set up is pretty similar, although because the rev. 4 handles different you can make a few changes...

1) Stiffer side springs, possibly instead of an orange you can go up to a blue or white, and not lose traction. Although because I only have like 6 packs on the car, I have not gotten to test alot of stuff that I have wanted to, although even on low traction I think i might go up to a blue side spring instead of an orange. Otherwise though the set up I ran on Sunday was the same as my rev. 3 set up (the car did have more steering though than my rev. 3 with the same set up, mostly in the middle of the corner, since the chassis edges were not rubbing, lol).

As far as servo mounting... Bruce drilled the holes in my chassis for a JR servo (3550). For the old school front end (which is all I am going to be running), I mounted it flat. The front of the case is lined up with the back of the arms and I am using the AE blue ball studs so they are slighly further forward than the ball studs on the knuckles. I am using the speedmerchant optional blue servo mounts with material dremeled off the bottom so that the servo is mounted as low as possible. I had to remove some material from the chassis though so that the servo saver doesnt rub (just dremeled a little skim layer off the top right under the servo). Unlike the rev. 3, on the rev. 4 there is no cut out extending below the servo saver, since it has a shorter cut out inbetween the arms and a peice extending from the back to the front of the cut out in the center to stiffen it up. Although the chassis overall is lighter than the Rev. 3 since it doesnt have the edges of the chassis or the o-ring braces.
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Old 03-09-2004, 11:06 AM   #7061
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Default rev4 Q??

Mark,

Whats changed to allow for more rear grip on low bite race days?

Ray
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Old 03-09-2004, 11:08 AM   #7062
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Default Re: rev4 Q??

Quote:
Originally posted by rayhuang
Mark,

Whats changed to allow for more rear grip on low bite race days?

Ray
Hopefully you'll find out Sunday.
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Old 03-09-2004, 11:11 AM   #7063
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Ian-I gotta drive your Car Sunday!! I talked to Bruce yeserday and he had so many orders for the car conversion already-swamped!!!

Ray
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Old 03-09-2004, 11:15 AM   #7064
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So do you tape the batteries in now?
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Old 03-09-2004, 11:46 AM   #7065
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The car doesnt loose traction and has better rear traction throughout the race because the sides of the chassis are not rubbing in the corners (which takes weight and thus traction off of the tire). At club racing it isnt as noticable that your chassis sides are rubbing but at big races, almost always there is a nasty black residue on the sides of the chassis from it hitting the track. I was at the Trackside USTC with bruce, and on his Rev. 4 prototype there was no black residue, while on my rev. 3 there was some. And I drove the cars back to back at that race, and his had more steering in the center and slightly more cut, as well as it seems to carry more speed through the corner; and we were running very similar set ups.

Right now you do have to tape in the batteries... Although there is enough room left on the chassis to set up a TBA system that does not use tape. I dont know any more details than that though.

BTW, when you guys build your rev. 4's, make sure not to remove alot of material for the batteries, since unlike the old rev. 3 battery trays, the rev. 4 barely needs any sanding/dremeling/filing, etc...
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