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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 02-24-2004, 12:00 PM   #6886
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tracky you need to empty out your message box i cant pm you because your box is full!
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Old 02-24-2004, 01:59 PM   #6887
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Default Bump Steer

Can anyone tell me how bump steer effects a 12th car?? I'm guessing that it isn't a good thing, hadn't really noticed how much my car had actually got until the other day.
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Old 02-24-2004, 08:02 PM   #6888
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Quote:
Originally posted by gijoe64
Hello guys, I have just fin my IRS Rugrat with the IRS front end and Silva spring steel T_bar.
If anyone is familar with this car and can help me with setup's I thank you. I will be running this car in stock class. I race TC's so this is my first 1/12.
gijoe64 - I saw the pictures of your car... nice. I'm not sure which class or surface you run in. For stock racing on ozite my setup for the rugrat is as follows: irs front end (10 degree reactive angle, all caster shims foward, .020 springs, 1.5 degrees camber, trinity red stuff lube on king pins), silva spring steel t-plate with 3 pod screws, silva center shock with 35 wt and blue associated spring, tweak screws and no springs on damper tubes, 10,000 silicone in damper tubes, batteries in rear position, 3.5mm ride height, Jaco Grey rears and Jaco purple fronts. I run the servo flat on the chassis with mid-height ball studs on the steering blocks and kimbrough mid-size servo saver. I noticed your servo is angled - some people like it mounted that way, but I liked the handling better with the servo flat.
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Old 02-24-2004, 08:13 PM   #6889
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Quote:
Originally posted by rayhuang
trackdesigner-very cool!!

PM me back-would ya-Got some things to yack at you about.
hey ray. My PM box was full so try to send me one again. I just cleaned it out
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Old 02-25-2004, 08:33 AM   #6890
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Quote:
Originally posted by trackdesigner71
hey ray. My PM box was full so try to send me one again. I just cleaned it out
Nothing really more to add!!
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Old 02-25-2004, 10:19 AM   #6891
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Default Rugrat

Mike D

Thanks for your setup.
Please clarify where you ballstuds are located on the servo saver.
Outside top, outside middle?

Thanks
Dave
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Old 02-25-2004, 11:42 AM   #6892
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I just drove my Rev3 that I got last week. Man that car is sweet. I got it used and I think there is somthing amiss in the rear end.

It could be tire spin or the rear end is not equal. When I really get on it the car pulls hard to the left. The tires are brand new, and the tweak is spot on..

Anyway, it was a blast!

Clint
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Old 02-25-2004, 11:52 AM   #6893
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Read a few posts up. There was another guy with the same problem. I was experiencing the same issue. Your rear axle may not be centered.
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Old 02-25-2004, 12:11 PM   #6894
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yes sir, plan on doing that tonight... the car rocked when I was easy and smooth on the throttle...

Quote:
Originally posted by dr_hfuhuhurr
Read a few posts up. There was another guy with the same problem. I was experiencing the same issue. Your rear axle may not be centered.
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Old 02-25-2004, 01:20 PM   #6895
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hello everyone as you all know the trackdesigner and i are putting on an event call the US pancar championships, we are moving the event to april or may and would like for you to voice your opinions on our thread, we would also like to get your feed back to hold the event memorial day weekend. please participate your presence will be noted thanks!
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Old 02-25-2004, 01:43 PM   #6896
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Quote:
Originally posted by speedxl
hello everyone as you all know the trackdesigner and i are putting on an event call the US pancar championships, we are moving the event to april or may and would like for you to voice your opinions on our thread, we would also like to get your feed back to hold the event memorial day weekend. please participate your presence will be noted thanks!
Memorial Day weekend would ROCK.
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Old 02-25-2004, 01:47 PM   #6897
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Quote:
Originally posted by Mike D
gijoe64 - I saw the pictures of your car... nice. I'm not sure which class or surface you run in. For stock racing on ozite my setup for the rugrat is as follows: irs front end (10 degree reactive angle, all caster shims foward, .020 springs, 1.5 degrees camber, trinity red stuff lube on king pins), silva spring steel t-plate with 3 pod screws, silva center shock with 35 wt and blue associated spring, tweak screws and no springs on damper tubes, 10,000 silicone in damper tubes, batteries in rear position, 3.5mm ride height, Jaco Grey rears and Jaco purple fronts. I run the servo flat on the chassis with mid-height ball studs on the steering blocks and kimbrough mid-size servo saver. I noticed your servo is angled - some people like it mounted that way, but I liked the handling better with the servo flat.
Mike D, Thanks for the info.
This will put me on the right track.
By the way I am running carpet.
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Old 02-25-2004, 01:53 PM   #6898
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Mike D are you running this front end?
Attached Images
File Type: jpg pdrm0088.jpg (99.4 KB, 188 views)
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Old 02-25-2004, 01:58 PM   #6899
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Default 1:12 Mod Brushes...

What brushes are you guys running in modified? I've been running the 728's in a Reedy Pt and seem to be ok. But I just wanted to find out what other people are running??
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Old 02-25-2004, 03:41 PM   #6900
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Default Trinity dynamic strut style front end

I wanted to try and experiment on my reflex 12 and put a dynamic strut front end on it....I know that trinity used to make a dymanic strut front end...I do not rember what it was called I had it on a revolver a bunch of years ago.

Does anyone no the name, part number or where to pick one up...trinity does not list it on their website and they are not overly responsive to emails so I figured I would consult a wider audience :-)

Cheers

Jamie
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