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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 01-03-2009, 09:06 PM   #30166
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well you could try letting your son drive to confirm this problem of yours sir.

lol tag got you back!
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Old 01-03-2009, 09:07 PM   #30167
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Quote:
Originally Posted by hanulec View Post
Does anyone know if the shock shaft on the new Silva HPS2 is the same diameter as the Hot Bodies shock? I just measured a Hot Bodies shaft and it has a diameter of 1.95mm. I had some issues when breaking the threaded end of the shock end cap on the Hot Bodies. It would be great to replace these end caps w/ the very inexpensive Silva model.
The shafts are the same size. FWIW the shocks are so similar that they look like they are made by the same manufacturer, so the shock end may not be any better
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Old 01-03-2009, 10:04 PM   #30168
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Originally Posted by hanulec View Post
Does anyone know if the shock shaft on the new Silva HPS2 is the same diameter as the Hot Bodies shock? I just measured a Hot Bodies shaft and it has a diameter of 1.95mm. I had some issues when breaking the threaded end of the shock end cap on the Hot Bodies. It would be great to replace these end caps w/ the very inexpensive Silva model.
Quote:
Originally Posted by odpurple View Post
The shafts are the same size. FWIW the shocks are so similar that they look like they are made by the same manufacturer, so the shock end may not be any better

The good old Associated end fits right on with two minutes of work with a 5/64 drill bit... If you want to get fancy, the IRS ends come in black anodized to match the original HB part. If you want the ultimate badass HB shock, the IRS nickel/teflon end is a perfect match to the HB shock body anodizing... The IRS ends are only $4.50 and I've never managed to break an IRS end (or an Associated end for that matter)

Again, you'll need to drill the hole with a 5/64, but it's a pretty easy job.
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Old 01-03-2009, 11:08 PM   #30169
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+1
It works! Or drive an associated and run the factory shock! j/k
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Old 01-04-2009, 01:52 AM   #30170
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Good win Saturday Andrew! The R5 is running better for you. What was your rollout for the Main?
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Old 01-04-2009, 04:25 AM   #30171
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That Mugen is one cool looking car, double deck old school style!!!

I'm going through my 12L4 since I shelfed it who knows how long ago and want to reroute the wires. Does anyone have a picture or 2 of a good clean t-bar specific installation? I'm running brushed for now (Novak GTS, 4mm gold plugs, 16g wire).

Also, I read a post a few days ago about running the positive wire from the battery to the motor first and having the jumper going to the ESC rather than the way I've usually done it with the jumper going to the battery....? I'm having a little trouble picturing how to do this cleanly, anyone with a pic?

Thanks in advance!!!
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Old 01-04-2009, 04:53 AM   #30172
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Adam, I don't have a picture of a brushed install handy, but I'll get one today at the track if possible and post from there. I think my buddy Alex has a car still wired up with a brushed system in it.
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Old 01-04-2009, 05:47 AM   #30173
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'Preciate it, thanks Trips.
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Old 01-04-2009, 03:26 PM   #30174
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Good win Saturday Andrew! The R5 is running better for you. What was your rollout for the Main?
Thanks David. I was running a SpeedPassion 17.5. I was trying to keep it rolled out at 90 mm or so. It still only came off at 138-140* so I will try going up a tooth or two and temping again this week as well as watching lap times.
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Old 01-04-2009, 07:44 PM   #30175
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ok sorry but what is roll out im new to 1/12 scale but with my r5 wish i would have got to the party sooner love that car handles like a dream
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Old 01-04-2009, 07:51 PM   #30176
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ok sorry but what is roll out im new to 1/12 scale but with my r5 wish i would have got to the party sooner love that car handles like a dream
It is how far the car will move for one rotation of the motor. So when you see someone state they had a 90mm rollout, that means their car would move 90mm for a single motor rotation.

The calculation requires knowing tire diameter, spur, and pinion.
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Old 01-04-2009, 07:53 PM   #30177
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ok sorry but what is roll out im new to 1/12 scale but with my r5 wish i would have got to the party sooner love that car handles like a dream
All rollout is the amount the car moves forward (rear tires roll) for one revolution of the motor shaft. Rollout only takes into account gear ratio and tire size (circumference). Since it is much easier to measure tire diameter with calipers, everyone uses that.

I posted an Excel spreadsheet in the BMI DB12R thread that allows you to easily find your rollout.

See this post: http://www.rctech.net/forum/4792583-post5349.html

For a given spur size, the left hand column is pinion size, the top row is tire diameter, and the rest of the data is the rollout. So, after entering your spur size, measure your tire diameter, go down that column until you find your desired rollout, and the go across to find the pinion you should use. The top chart is rollouts in mm, the bottom is rollouts in inches. Both tables have the tire diameter listed in mm and inches, so it doesn't matter what units someone else gives you the rollout in, you can easily find it.
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Old 01-04-2009, 08:24 PM   #30178
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Quote:
Originally Posted by CarbonJoe View Post
All rollout is the amount the car moves forward (rear tires roll) for one revolution of the motor shaft. Rollout only takes into account gear ratio and tire size (circumference). Since it is much easier to measure tire diameter with calipers, everyone uses that.

I posted an Excel spreadsheet in the BMI DB12R thread that allows you to easily find your rollout.

See this post: http://www.rctech.net/forum/4792583-post5349.html

For a given spur size, the left hand column is pinion size, the top row is tire diameter, and the rest of the data is the rollout. So, after entering your spur size, measure your tire diameter, go down that column until you find your desired rollout, and the go across to find the pinion you should use. The top chart is rollouts in mm, the bottom is rollouts in inches. Both tables have the tire diameter listed in mm and inches, so it doesn't matter what units someone else gives you the rollout in, you can easily find it.
Very handy , thanx
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Old 01-05-2009, 04:47 AM   #30179
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hey i'm new to link cars, and i'm not sure if i've asked this question earlier and just forgot... but anyway...

i've got a 12r5, and adjusting from box setup, exiting corners, it seems want to do 360s, this is when i'm putting the power on while steering throught the corner. I have to counter steer or go slower to get it to go where i want, didnt used to have to do this with my corally t-bar car, and don't know how to adjust for this handling issue with a link car.

I'm using standard springs front and side (just purchased all side springs today), using 20 weight side oil.

I'm pretty sure it has got to do with the side springs, should i got softer or harder, or do they just need more tention.

any advice is much appreciated.
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Old 01-05-2009, 05:43 AM   #30180
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The general rule is softer side springs for more rear grip. In m opinion, run the side springs just touching, no preload. Or back each one off from just touching by the same amount in some cases. I never pre-load the side springs, I don't believe there's any point to it.

Are you runnign the same tires and on the same surface as the Corally?
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