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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 10-03-2009, 03:28 AM   #32326
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That will work if you plan on using a 2 cell lipo receiver pack.

The thing you are looking for is the Novak Booster.
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Old 10-03-2009, 05:18 AM   #32327
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Hey guys, I'm looking for a starting gearing for 17.5 with a Tekin RS Pro with 200 software. I will be running full size Jaco's for the first little bit until my truer gets here.

Thanks
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Old 10-03-2009, 07:18 AM   #32328
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Originally Posted by Scottmisfits View Post
That will work if you plan on using a 2 cell lipo receiver pack.
Thanks
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Old 10-03-2009, 08:02 AM   #32329
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Originally Posted by Scottmisfits View Post
Hey guys, I'm looking for a starting gearing for 17.5 with a Tekin RS Pro with 200 software. I will be running full size Jaco's for the first little bit until my truer gets here.

Thanks
76/40
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Old 10-03-2009, 09:10 AM   #32330
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Originally Posted by andrewdoherty View Post
76/40
Quote:
Originally Posted by Scottmisfits View Post
Hey guys, I'm looking for a starting gearing for 17.5 with a Tekin RS Pro with 200 software. I will be running full size Jaco's for the first little bit until my truer gets here.

Thanks
You would get a more solid number if you could include a tire size. I don't have a new set of Jaco's to measure, are they about 51.00mm? With the previous answer of 76/40, that would give you a Rollout = 84.33mm.

I'm still running the GTB 4-cell (upgrading to the Tekin RS soon) and I know there are some differences in the Rollout between the two. I also would like to get some more information as I'm switching to 1S Lipo with my GTB.

Other important points would be: Are you on a short/tight layout or a long/open layout. Are you still using round cells or have you changed over to 1S Lipo?

With the GTB on Round cells/brushless 17.5, the typical Rollout range would be from the low 60's to the upper 70's (depending on track layout) while trying to get your motor temperature to about 160F.

How does the Rollout for a GTB 4-cell compare to the Tekin RS? How does the Rollout for round cell 17.5 compare to Lipo 17.5?

Maybe we can get some more input here and help us both out? Without knowing which battery your running and an exact tire size, a gearing choice would be a random guess.

Aaron
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Old 10-03-2009, 09:36 AM   #32331
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Scott,

I haven't run this setup yet but this is what I'm going to start with next week at the CARCAR track.

Drag: 50
Rev: Off
Brake: 50
Motor: BL FW
Throttle: 4 (I don't want it too aggressive)
Push: Off
Boost: 25
Turbo: 20
Turbo Delay: 0.5
Sensored Only

Rollout ~90-92mm so whatever spur/pinion you'd need to get to that rollout with the full-sized Jaco's (I think they're about 51mm out of the box).

We can compare notes when we're at the track at the same time!

Cheers,
Mike

Quote:
Originally Posted by Scottmisfits View Post
Hey guys, I'm looking for a starting gearing for 17.5 with a Tekin RS Pro with 200 software. I will be running full size Jaco's for the first little bit until my truer gets here.

Thanks
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Old 10-03-2009, 10:54 AM   #32332
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Originally Posted by Scottrik View Post
Honestly...I'll bet you don't let your food touch on your plate either.
You let your food touch? ewww!
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Old 10-03-2009, 11:06 AM   #32333
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Originally Posted by InspGadgt View Post
The Blackhawk tires and rims are made by Jaco for Parma...however I find the Blackhawk front rims have an extreme amount of play in the front bearings where the Jaco rims do not. I would like to stay with black rims too but not with that much bearing play...stick with the Jaco rims, you will be better off.
This is a problem that happened on the latest batch of Blackhawk rims and will be corrected. I've seen this problem and worse on the white rims too.

If you are stuck with some of the Blackhawk rims with the sloppy bearing holes here is an easy trick to employ so you can use them: Take an old decal and cut a small square out that will fit over the bearing hole. Press it onto the hole and cut an "x" with your xacto across the center, then push the bearing in. Trim the excess if you don't like your food to touch, the bearing will fit perfectly and the wheel will run true (if the rim is true)
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Old 10-03-2009, 11:08 AM   #32334
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Originally Posted by VRacing View Post
You would get a more solid number if you could include a tire size. I don't have a new set of Jaco's to measure, are they about 51.00mm? With the previous answer of 76/40, that would give you a Rollout = 84.33mm.

I'm still running the GTB 4-cell (upgrading to the Tekin RS soon) and I know there are some differences in the Rollout between the two. I also would like to get some more information as I'm switching to 1S Lipo with my GTB.

Other important points would be: Are you on a short/tight layout or a long/open layout. Are you still using round cells or have you changed over to 1S Lipo?

With the GTB on Round cells/brushless 17.5, the typical Rollout range would be from the low 60's to the upper 70's (depending on track layout) while trying to get your motor temperature to about 160F.

How does the Rollout for a GTB 4-cell compare to the Tekin RS? How does the Rollout for round cell 17.5 compare to Lipo 17.5?

Maybe we can get some more input here and help us both out? Without knowing which battery your running and an exact tire size, a gearing choice would be a random guess.

Aaron
Ther is no magic rollout numbers as the track size make a huge difference. But in my experiance with 1s these guidlines are in the ballpark:
1s non timming advace esc:
17.5 - 100mm+ rollout
13.5 - 90mm+ rollout
1s with tekin running 200:
17.5 - 90mm rollout
13.5 - 80mm rollout

I'm no pro but these are good starting points to which you can adjust depending on the track size, grip, and layout.
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Old 10-03-2009, 11:15 AM   #32335
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You would get a more solid number if you could include a tire size. I don't have a new set of Jaco's to measure, are they about 51.00mm? ...
New Jacos/Blackhawks are 48mm out of the box
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Old 10-03-2009, 12:04 PM   #32336
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You let your food touch? ewww!
I let my food touch, but to make up for that social faux pax I only eat one thing at a time, starting with the thing that tastes worst cold or tastes best hot. Potatos top that list.

After 22 years and change together my wife still shakes her head about that.
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Old 10-03-2009, 01:21 PM   #32337
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This is a problem that happened on the latest batch of Blackhawk rims and will be corrected. I've seen this problem and worse on the white rims too.

If you are stuck with some of the Blackhawk rims with the sloppy bearing holes here is an easy trick to employ so you can use them: Take an old decal and cut a small square out that will fit over the bearing hole. Press it onto the hole and cut an "x" with your xacto across the center, then push the bearing in. Trim the excess if you don't like your food to touch, the bearing will fit perfectly and the wheel will run true (if the rim is true)
Well that's good to hear...I always used tape for that, no need to ruin a perfectly good decal

Only reason I run the Jaco rims though is the cost. I prefer other rim designs but at 30% more cost I can't justify buying the more expensive rim.
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Old 10-03-2009, 02:58 PM   #32338
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Thanks Chris, that info will help us get started with our own experimentation. Appreciate the help!

Aaron
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Old 10-03-2009, 08:18 PM   #32339
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[QUOTE=chris moore;6416968]Pics say it all


Can someone help me find the hobbywing booster. I found the hobbywing site but could not find the booster.

Thanks
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Old 10-03-2009, 08:27 PM   #32340
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[QUOTE=Fastforward;6425012]
Quote:
Originally Posted by chris moore View Post
Pics say it all


Can someone help me find the hobbywing booster. I found the hobbywing site but could not find the booster.

Thanks
http://www.hobbyking.com/hobbycity/s...idProduct=7884
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