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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 12-18-2002, 07:37 PM   #2086
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Go ahead and sell it. I decided to get a new car instead. I appreciate your assistance though. Hopefully we will be racing with you guys real soon.
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Old 12-18-2002, 08:50 PM   #2087
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Default Re: Speedmerchant Xmas

Quote:
Originally posted by Doug Gaut
We need some help! What tuning parts/springs,tires for ozite carpet,body, complete setup suggestions? My racing partner and I are going to order two tonite for a race on Dec 27,28th. Any help would be GREATLY appreciated as time is not a luxury!!
Doug,

Start with purple fronts and gray rears, I've used both TRC and Jaco, I like both. I'd go with the kit spring on the shock and 30 or 40wt oil, and white side springs. Run Losi light or medium hydra fluid in the dampener tubes. Light fluid in the tubes will make the car quicker to react, but maybe a bit "nervous", thicker fluid will settle the car down, but may cause it to feel a bit lazy. If you're running the "old skool' front end, try 020 or 022 springs (the 020's will give you more steering, but may make the car feel weak coming off corners) If you're running the new Associated front end, I'd go with 020 or 018 springs, the reactive upper arm mounts, and run one caster shim in front and one in back of the upper arm. Set camber to -1.5 to start, then adjust for flat tire wear.

Ride height 3 to 3.5mm front and back. Set the shock spring preload so the chassis and pod are in a straight line with the car at rest fully loaded. Set the shock length so that when you lift the car the pod droops slightly down from a straight line with the chassis.

Hope that helps,
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Old 12-18-2002, 09:01 PM   #2088
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Is there any other items we will need for slicker tracks or spare parts that might be broke and cannot find from a local shop? Is there any need for the other types of side springs?
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Old 12-18-2002, 09:51 PM   #2089
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thanks for all the sizes trips, looks like i wont have to buy any more hudy drivers. is there anything else i should pick up for the rc12l3, the reason is im expecting the car in about four days and the lhs wont be open for a month after monday. and you guys know what its like when you've built a new car.
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Old 12-19-2002, 12:27 AM   #2090
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Thanks for the help Trips!! Jeff and I got our cars ordered tonite. Should be here Friday. Is there a site that the Speedmerchant drivers frequent to chat about their cars and setups? I went through all 70 some pages but did not see much info on setups for the car.
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Old 12-19-2002, 07:12 AM   #2091
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ausracer: I use the Hudy drivers myself. IRS makes a pro diff for the car. IRS #132 this allows you to use the thick 1/10 diff rings and 12 balls vs 6 on the 1/12. Kimbro makes diff dust covers that keep the garbage out of the diff ~$6. IRS also makes a thread kingpin that does away with the e-clips on the car. $8 Lunsfors makes a titanium axle that uses nuts vs e-clips. $10 At least buy some extra e-clips as these things fly off in the darnest places!!
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Old 12-19-2002, 07:14 AM   #2092
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ausracer,

I'd keep some extra t-bars and front springs on hand, replace the front springs whenever they get saggy, and the t-bar every three race days or so.

T
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Old 12-19-2002, 10:10 AM   #2093
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Hi Doug,
A lot of the 12th guys are on http://www.12thscale.com/ It seems to cater just to 12th scale 4-cell carpet. Click on the Forum link on the left. Hope it helps. Merry X-Mass everyone.
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Old 12-19-2002, 08:59 PM   #2094
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I've just picked up an Associated 12L (yep L not L3) to tool around with. Might get into racing with it yet even though not much local interest.

Anyways my question is regarding the rear pod on this thing. I assume I am gonna bust a T bar sooner rather than later and I think the parts are no longer available for the 12L? Is it possible to upgrade the rear pod to a model with supportable parts while keeping the same chassis?
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Old 12-19-2002, 09:12 PM   #2095
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Another question, does anybody know who makes pre-mounted tires to suit a 2 screw rear axle?
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Old 12-19-2002, 09:16 PM   #2096
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AMG- It is phyiscally possible to modify a L3 T bar to run on the L. Before you break your one and only L T bar....buy yourself an L3 T bar. Clamp the two pieces together using the screw holes for alignment. Drill out 2 new holes, cut off one length of the T.....hey presto!

Best to keep the original L T bar as the master!
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Old 12-19-2002, 09:22 PM   #2097
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AMG- Say thank you to RC Nitro...he posted this link...

http://members.willinet.net/bmurdock...hobby_shop.htm

2 bolt pre mounted wheels ON SALE!!
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Old 12-19-2002, 09:25 PM   #2098
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Quote:
Originally posted by dtm
AMG- It is phyiscally possible to modify a L3 T bar to run on the L. Before you break your one and only L T bar....buy yourself an L3 T bar. Clamp the two pieces together using the screw holes for alignment. Drill out 2 new holes, cut off one length of the T.....hey presto!

Best to keep the original L T bar as the master!
OK awesome!! I am not adverse to some dremel action
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Old 12-20-2002, 04:44 AM   #2099
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Another question. Will the 3 hole hubs off the 12L3 axle fit/work with the 12L axle assembly? I figure I can just get the hubs and convert to more readily available 3 hole rims.
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Old 12-20-2002, 09:22 AM   #2100
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Quote:
Originally posted by AMGRacer
Another question. Will the 3 hole hubs off the 12L3 axle fit/work with the 12L axle assembly? I figure I can just get the hubs and convert to more readily available 3 hole rims.
older axle and newer 12L3 axles are not compatible.
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