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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 12-09-2008, 11:32 PM   #29866
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Actually tire split is pretty useful for tuning steering characteristics. Larger split = more rear grip, less turn in. Closer split = more turn in, free rear end.

2 - 3mm of split should be a pretty common number.
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Old 12-10-2008, 12:10 AM   #29867
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Thanks

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Originally Posted by Slapmaster6000 View Post
Actually tire split is pretty useful for tuning steering characteristics. Larger split = more rear grip, less turn in. Closer split = more turn in, free rear end.

2 - 3mm of split should be a pretty common number.
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Old 12-10-2008, 08:13 AM   #29868
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Quote:
Originally Posted by hairy View Post
One reason is larger tire = more speed.
Of course, that all depends on gearing / rollout. Once you find a rollout that works for you, as your tires wear, you need to adjust your gearing to maintain that rollout. If the rollout is the same, the speeds should be the same, regardless of the tire diameter.
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Old 12-10-2008, 08:17 AM   #29869
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i would like to know what people think about ride height?

3, 4, 5, what height?

car level or front low or rear low?

anything else ????

i go to different tracks No permant home track. one track is smooth and 48x100 and gets grip. the other is bumpy and 48x75 and stays low on traction.
i run stock and maybe 13.5
cars are ff07 and bmi db12r

Racin'4-fun
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Old 12-10-2008, 08:47 AM   #29870
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I'm really new to 1/12th but I can tell you what's worked for me so far.

I run a 12R5 in Stock with basically the kit setup on it. Our club's indoor carpet track is EXTREMELY bumpy (it's laid over very poorly poured concrete) and I have found that I need to run 5-5.5mm. I usually run 5.5mm on the back and 5mm on the front and it seems to work quite well.

When I went to a larger regional race last month the track was much smoother and went down to about 4.5 on the back and 4 on the front.

Cheers,
Mike

Quote:
Originally Posted by DriftDreamer06 View Post
i would like to know what people think about ride height?

3, 4, 5, what height?

car level or front low or rear low?

anything else ????

i go to different tracks No permant home track. one track is smooth and 48x100 and gets grip. the other is bumpy and 48x75 and stays low on traction.
i run stock and maybe 13.5
cars are ff07 and bmi db12r

Racin'4-fun
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Old 12-10-2008, 09:04 AM   #29871
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Quote:
Originally Posted by Trips View Post
Well I held out as long as I could. I've been running brushless in my TC for a while, but I wanted to stay with brushed motors in my 1/12 car for as long as I could because the sight of all that wiring in a 1/12 car just didn't look right to me. After this last weekend I couldn't hold out any longer. Having the only brushed 1/12 car at the regional (Region 1) didn't bother me, but the power fade after only a few laps really did... I saw a post by Carl Giordano in the Speedmerchant Rev5 thread with some pics of a car that odpurple built for him, and it was clear that it IS possible to get all that wiring hidden away. I'm nowhere near the perfectionist that odpurple is, but I at least have a brushless 1/12 car that doesn't hurt me to look at. Here's my newly converted Flexi '07, the Tekin RS makes it pretty easy to get a nice tidy job... Can't wait to run it this weekend at the Toys For Tots race at 360 Speedway in Babylon, NY

Looks good Trips...see you at the toys for tots at 360 this weekend. Going to break-in the Rev 5. Not sure if ready to go with the 1c Lipo yet, as I'll have to re-wire the car but looks promising.
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Old 12-10-2008, 09:04 AM   #29872
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I run anywhere between 3 to 4.5mm ride height. For low grip situations I go more towrd the higher side of the range, also for bumpy conditions. Smooth and high grip I keep the car at the lower end.

Low in front makes for a more aggressive feel, low in back settles the car and makes it easier to drive. I'm usually running level or very slightly low in front.

Also related to ride height is pod sag and pod droop. Pod droop is how far the rear of the pod can go below level when the shock is fully extended. You adjust this be lengthening or shortening the shock. I usually start off with the rear edge of the pod drooping around 1mm from dead level. Lengthening the shock slightly for more droop helps the car turn in more aggressively and is nicer on bumpy surfaces.

Sag is how low the hinge line between the pod and main chassis rides when the car is sitting on its wheels at full race weight. You adjust this with the spring collar on the shock. More preload = less sag. I look for my car to be level at the hinge line or very slightly low, maybe a half to one millimeter.

When the car is sitting on its wheels, I'll grab the rear body posts and lift. Between the sag and droop I can lift the rear body posts about a millimeter and a half before the rear wheels come off the ground.
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Old 12-10-2008, 02:31 PM   #29873
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Default pod droop

hey trips duz that also work for t-bar cars (the lifting of the rear body mounts )
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Old 12-10-2008, 11:07 PM   #29874
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thank you for your replies. i will be back with more question but for now THANK YOU

Racin'4-fun
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Old 12-11-2008, 04:47 PM   #29875
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Default Parma tire ?

So for those who prefer the Parma tires over the Jaco's, what compounds have you found to work well for asphalt and which for carpet? I've allways used the Jaco but might want to get a set or two just to try.

Thanks
Chris
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Old 12-11-2008, 05:00 PM   #29876
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I haven't tried the new Parma tires yet but would like to. Personally I prefer the CRC High Roller rim but at the price I get Jacos, I just gotta run them.
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Old 12-11-2008, 05:18 PM   #29877
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Originally Posted by Carl Giordano View Post
Looks good Trips...see you at the toys for tots at 360 this weekend. Going to break-in the Rev 5. Not sure if ready to go with the 1c Lipo yet, as I'll have to re-wire the car but looks promising.
Looking forward to seeing you G... it's been WAY too long...

David
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Old 12-11-2008, 05:21 PM   #29878
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Originally Posted by isuzuguy View Post
hey trips duz that also work for t-bar cars (the lifting of the rear body mounts )
Absolutely... A t-bar car will usually run a lighter spring on the shock because the t-bar supports some of the car's weight, but other than that the sag and droop are going to be similar.
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Old 12-11-2008, 05:31 PM   #29879
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Quote:
Originally Posted by chris moore View Post
So for those who prefer the Parma tires over the Jaco's, what compounds have you found to work well for asphalt and which for carpet? I've allways used the Jaco but might want to get a set or two just to try.

Thanks
Chris
On carpet, I've been using grey rear and coral front, I also recently tried coral rear with magenta front at Mike Haynes' suggestion and REALLY liked that combo. The carpet was really grippy that day, and the coral rear magenta front combo was aggressive and fast, with no hint of traction rolling. Thanks Mike!

On asphalt, (360 pulled up the rug last summer and we raced on the asphalt underneath) I ran magenta rear and purple fronts. Worked very nicely. 360's asphalt is ultra smooth and grippy... you might want to look at something different outdoors, or for less pristine asphalt... maybe pink rear with purple or magenta fronts to get the balance where you like it.
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Old 12-11-2008, 05:33 PM   #29880
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Quote:
Originally Posted by chris moore View Post
So for those who prefer the Parma tires over the Jaco's, what compounds have you found to work well for asphalt and which for carpet? I've allways used the Jaco but might want to get a set or two just to try.

Thanks
Chris
Well, when I run Parmas on asphalt out here in San Antonio, I use magenta fronts and pink rears.Also sometimes run purple fronts when tractionis high, but most of the time purples would make me push.

Last edited by CarlosG.; 12-11-2008 at 09:56 PM.
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