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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 05-01-2006, 08:17 PM   #18316
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Decathlon: Try Hobby Habit in Adelaide. They have a number of L4 kits in stock at the moment and some parts to suit. Not sure about Chassis, but worth a call anyway. 08 8277 1111
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Old 05-01-2006, 08:18 PM   #18317
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Quote:
Originally Posted by Tekin
Does someone knows how that car performs?
It looks great indeed, but how does that front end deal with crashes, just as "good" as the old Trinity (switchblade) front end?
It also looks a bit on the heavy side, but maybe I'm wrong...
car (which i still have) was great when i ran it at a carpet track in Tuscon AZ. i ran it in mod with a 11dbl orion with 2-stage jacos pu fronts and dbl pink rears. the car steers and tracks very well. i didn't run the NTS system and went with a .080 thick t-bar from SG1. track had a good groove run into it, high traction.

they build these cars initially for you, i requested the front be set like it had 5deg suspension blocks.

the front end is actually lighter than the standard AE Dyn-frt end. Laje uses IRS lowered AE front lower arms, AE offset steering blocks, AE top suspension pivot ball link in building there front end. they have different link plates and as one can see it is infinitely adjustable.

the 4-bolt pod plates are their own design and manufacture, dampner tubes are CRC, diff is IRS. the only thing metric on my car was the center shock and pivot mounts. the SE-12 center shock is from a 18th scale offroad car.

when i asked them if anyone was driving one here in the states, they mentioned a name who later i found out was.....Odpurple....imagine that

i still have the car, due to having to move i only got 1 race on it, 5 total heats. the carpet tracks i race at now are bumpy and have no groove on them. so i run a DP fiberglass Quad-12 tape edition (pictured in post #14019 on this thread) it makes traction and does extremely well on bumpy tracks.

Last edited by fast-ho-cars; 05-01-2006 at 08:36 PM.
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Old 05-01-2006, 08:56 PM   #18318
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Quote:
Originally Posted by JRX-S Bill
I had a point???
On yer head!
(sorry, too easy)
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Old 05-01-2006, 09:11 PM   #18319
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Quote:
Originally Posted by odpurple
On yer head!
(sorry, too easy)
Again....YOU win! Geeze!
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Old 05-01-2006, 09:15 PM   #18320
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Hah! Say "Uncle"!
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Old 05-01-2006, 09:19 PM   #18321
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Quote:
Originally Posted by odpurple
Hah! Say "Uncle"!
My RDX will be "looking" for your 1/12 scale during practice rounds kid...
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Old 05-02-2006, 09:37 AM   #18322
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Quote:
Originally Posted by JRX-S Bill
My RDX will be "looking" for your 1/12 scale during practice rounds kid...
You'll have to catch me first Besides, I heard those cars have a Glass Jaw, er, A arm!
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Old 05-02-2006, 07:17 PM   #18323
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Default need some help

Hey guys, some body knows if the hitec hs81 mg fits on the associated rc12l3 with no needs to make modifications on chassis?

tks
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Old 05-02-2006, 07:49 PM   #18324
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I run the 81mg in my crc t-force and my friend runs it in his hara l4conversion. Both shoogooooood them to the chassis with no drilling or harware needed.
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Old 05-02-2006, 07:53 PM   #18325
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Quote:
Originally Posted by odpurple
You'll have to catch me first Besides, I heard those cars have a Glass Jaw, er, A arm!
Yeah...I'd heard "RDX" stands for "Really Delicate X-Ray"

Then again, the Corally guys say it's "Really Dialed X-Ray"

Would seem to be a matter of perspective.

Scottrik
still wheelin' my BMI TC3...
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Old 05-02-2006, 08:13 PM   #18326
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Quote:
Originally Posted by Scottrik
Yeah...I'd heard "RDX" stands for "Really Delicate X-Ray"

Then again, the Corally guys say it's "Really Dialed X-Ray"

Would seem to be a matter of perspective.

Scottrik
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Old 05-02-2006, 08:17 PM   #18327
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L4 Understeer question.

I know its probably burried somewhere in these 600 odd pages ( been back 25 and can't find it ) but as a 1/12 noobie I have a handling/setup question.

I have a standard 12L4 with IB3800's, LRP 10x2, 0.063 T Bar, Upper arms at 10 degrees, 0.5 degrees camber, Caster at middle position, Green rear spring, 0.020 front springs, batteries aft and was running Jaco Pink rears and Jaco Purple Fronts, all running on outdoor smooth asphalt. I had lots of oversteer with this setup, way too much steering ( had to turn steering down to 20% ). Changed to TRC Platinum rears and what a difference, car now had rear end traction, able to turn steering back up to about 80% and rear stable enough to be able to steer on throttle a bit, also rock solid rear with power off too. Able to far more confidently power on hard exiting turns. The problem I know have is that it's got a bit of front end push or understeer. Its' good at low speed, turns on a dime, but at higher speeds it understeers a lot. I tried changing to Jaco Double Pink fronts and that helped with low speed turn in but it still ploughs on at high speed. It's not that bad really, still able to get around the track no probs, its just the fast sweeper at the end of our track is
its main problem, I'm having to back off too much and loose too much time here. I have softer front springs coming ( 2 weeks away ) and will try shifting some weight forward. I tried dialling in more steering, but I think all thats doing is scrubbing the tires harder, made little effect on highspeed understeer.

Any other suggestions to cure med to high speed understeer without loosing too much rear end bite on asphalt?

Thanks

Leigh, Sydney Australia.
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Old 05-02-2006, 08:30 PM   #18328
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You might try more caster.
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Old 05-02-2006, 09:38 PM   #18329
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how much "preload" is on the center spring? tighten that (compress) spring for a little more steering. try 2 turns and see if she does how you want.

and your pinks that you cant get hooked up with - is the asphalt clean and prepped with some sort of track prep (soda, vht, etc?)
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Old 05-02-2006, 10:11 PM   #18330
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Asphalt is blown/swept clean but has no additive or prep. Center spring has very little preload at present. I shall try the caster and center spring, one at a time of course. Thanks guys.
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