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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 10-30-2006, 11:07 AM   #21571
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Default 380 size BL in a 12th

Vision

05 sized BL with 05 size brushed motors, are currently allowed in 12th Mod class. sometimes they win...sometimes they don't

ROAR over here has a 05 size motor limit, i believe it has to be exact size equivilent. but if that is the maximum only, are we allowed to go smaller? loop hole?

Tekin article is interesting, many pages back in this thread there was a post showing a 540/05 to 380 downsize adapter some company made. this would preclude having to mount a 380 motor in a 12th with one screw. i don't see a mention of how much weight this 380 system dropped from the car and if they added it back?

12th scale has been coming back lately and i don't beleive adding 380's BL or Brushed to the class would help. 12th which is still fragile class when it comes to local racing attendance would become like sedan, which is being oversplit up based on tires, cells, etc. etc.

one guy recently converted a 12th at our track to a 380 motor, 4 months back, he used 6 IB 1400 cells. the car was lighter, incredibly fast and made 8min no problems.

there is already a whining in TC threads concerning redesigns if 4-cell TC gets adopted.

if allowed....12th scales would get redesigned fast with a much smaller pod for 380 motors, there would be no reason to still run the current size 4200/4300's. 1/2 2000+mah or 3/4 3000+mah sub-C's could be used, even the IB1400 cells used in the 18T classes. due to a lighter car and rear end the t-bar would end up getting downsized, with overall less weight the rear diffs would end up on a diet and maybe look like something like a Mini-z diff axle size.

www.laje.se has made a 1/18th scale 380 motor pancar called the Track Drooler, it's a link car pretty neat. something like that could be used on small tracks. who knows what could happen?

Last edited by fast-ho-cars; 10-30-2006 at 11:25 AM.
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Old 10-30-2006, 11:24 AM   #21572
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actually i think it won't happen. 1/12 ever works with 540 size. 4 elements are great. it's unuseful to come back to 6 elements (even if 1400mA).
I was just curious about the performance of a mini BL system with 4 elements. I like tekin and i would like to bielive what they say but i keep cool with commercial article.
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Old 10-30-2006, 11:58 AM   #21573
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I also don't think that's going to happen, atleast I'd hope so because it could just kill the 12th class. I think you should use the same motors and batteries as the TC's are using. The 12th class is to small for companies to make special motors and batteries for them.
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Old 10-30-2006, 12:44 PM   #21574
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Ah cool. they arent on the jaco web site so I figured they werent out yet. The ones I had were a donut on the jaco rims so i had to grind the sides down but esentially they are the same thing
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Old 10-30-2006, 01:19 PM   #21575
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Can someone please give me a good starting rollout for a 9 turn Checkpoint and the timing for the motor. I ran a 22t pinion with a 100t spur and 48.4mm diameter tires with the motor timed at 18 degrees and dumped brand new 4200's!!! What am I doing wrong!!!
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Old 10-30-2006, 02:11 PM   #21576
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JACO

Black 2stages front
Yellow 2stages rear

Switchblade- Do you race those tires combo in stock or 19t?

I have use this combo in 19t with good results.

Thanks
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Old 10-30-2006, 02:37 PM   #21577
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Quote:
Originally Posted by jjmudd
Can someone please give me a good starting rollout for a 9 turn Checkpoint and the timing for the motor. I ran a 22t pinion with a 100t spur and 48.4mm diameter tires with the motor timed at 18 degrees and dumped brand new 4200's!!! What am I doing wrong!!!
your driving... definately your driving lol.
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Old 10-30-2006, 05:27 PM   #21578
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Quote:
Originally Posted by axle182
your driving... definately your driving lol.
I'm going to spank you like the $.25 hussy you are!!!!
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Old 10-30-2006, 05:42 PM   #21579
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Quote:
Originally Posted by jjmudd
Can someone please give me a good starting rollout for a 9 turn Checkpoint and the timing for the motor. I ran a 22t pinion with a 100t spur and 48.4mm diameter tires with the motor timed at 18 degrees and dumped brand new 4200's!!! What am I doing wrong!!!
Make sure your cars not pushing, roll the entire infield with the least amount of quick on/off on the throttle and dont pull it 100% on the straight the first few laps. Make sure your coming off with a clean bottom chassis. If your chassis is all black (assuming carpet) your probably driving to hard in the corners or you need to make your car run flatter or make ride height a little bit higher.

The pro mod guys running brushed motors still dump with new packs too-btw.
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Old 10-30-2006, 06:11 PM   #21580
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Quote:
Originally Posted by Thraex
I also don't think that's going to happen, atleast I'd hope so because it could just kill the 12th class. I think you should use the same motors and batteries as the TC's are using. The 12th class is to small for companies to make special motors and batteries for them.
i think you meant 18th on that last sentence, well looks like it's happening anyway. i just got this notice about the new 2007 Robotronic 1/18 pan car called the Scalpel. took me by surprize, i had no clue when i did my post earlier today
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1/12 forum-scalpel-18th-scale.jpg   1/12 forum-scalpel-18th-scale-.jpg  
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Old 10-30-2006, 06:18 PM   #21581
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Oh that little thing is bad ass. I love it. It would be sweet to buy 10 of these and let newbies race them by renting them for the race night. Not to mention the possibility of running them in smaller areas like your basement or garage.
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Old 10-30-2006, 06:19 PM   #21582
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Quote:
Originally Posted by fast-ho-cars
i think you meant 18th on that last sentence, well looks like it's happening anyway. i just got this notice about the new 2007 Robotronic 1/18 pan car called the Scalpel. took me by surprize, i had no clue when i did my post earlier today
Bud Bartos (BRP racing) has been selling and racing 1/18th kits for years. They have a following in pockets all over the country. Very fun and require the exact same sort of driving as a 1/12th at an ridiculousley low price to buy and maintain. They run on AA or 2/3rdC cells (receiver pack cells) last time I raced them.
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Old 10-30-2006, 08:51 PM   #21583
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Quote:
Originally Posted by Mart42
JACO

Black 2stages front
Yellow 2stages rear

Switchblade- Do you race those tires combo in stock or 19t?

I have use this combo in 19t with good results.

Thanks
I ran them in stock. I brought purple and whites and up till the practice heat they worked good but then the grip got too high and they just had too much bite. So I got ahold of one set and ran them the entire rest of the classic. The car turned just as good and had just as good grip as the whites and pruples did before, but the car was very smooth. But by the b main I could tell that they also had built up probobly a little too much grip since my car started to push like it didnt in the last qualifier. Still I had to do it but they worked awesome. I was thinking maybe double pink/double pink for 19t but maybe ill give them a try.
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Old 10-31-2006, 08:24 AM   #21584
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PARMA VIOLET FRONT TIRES

Ive been getting asked this via PM quite a bit so I finally asked Chicky the part number. It is 16022 It is not on there website for some reason.

I've been runing them lately on my 3.2r and have found them to be no harder to drive, but faster. I sauce Purples about 3/4 to 7/8 , but on the violets I stop where the magenta meets the purple (about half).


also-Parma introduced a revised Speed 8 body at the Halloween Classic. Its just plain faster than the Speed8 in my mind in stock or mod on carpet. More stable is the way everyone described it. Paul is putting some final touches on it this week. No part number or name for it yet that I know of. I'll keep everyone informed and if I go to track to pick up my body-then I'll snap a sneak peek pic of it. Its got some trick aero on it that should please not only the eye, but the handling!!

Ray

Last edited by rayhuang; 10-31-2006 at 09:34 AM.
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Old 10-31-2006, 08:29 AM   #21585
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They come in packs of 17

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