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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 03-15-2003, 09:17 AM   #2581
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C'mon, can't have this thread falling to page 2 now...

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Old 03-15-2003, 09:21 AM   #2582
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ok page two
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Old 03-15-2003, 11:18 AM   #2583
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Is the Speedmerchant Road Kill any good on carpet? I've read good things about their cars but this is the only 6 cell I can find. I've narrowed it down to either the L3, CRC 6 Pack or the Roadkill. I want a change from the Corally for next season.

I race on a VERY small carpet track, it's about 10x14m.
so a responsive car is essential. The Corallys seem to be slower than the L3s through the switchback turns because of the extra slop in the steering. I'm also going to get a good servo, is the KO digital worth it?

Thanks
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Old 03-15-2003, 05:15 PM   #2584
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louis- thats a micro track! lol. no one really runs 6 cell 12th scales anymore since it really kills the tires (the car is so heavy) and you mind as well run mod to get more speed, or 19t (which all of tracks do now).

i would highly suggest the speedmerchant (either 6 or 4 cell version) since it does the best what you are looking for (quick transitions). also with the new front end coming out it will have plenty of steering to get around that track (right now the old style front end is great, but the v-force should be alot more adjustable to tune to each track, which in your case will help you out alot, since its far from your standard carpet track)
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Old 03-16-2003, 12:29 AM   #2585
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hi! Just got 1/12th RC12L30!!!
From Ultimate Hobbies!!!!!!!!!

Hehehehehehe! Just could not resist even if I think its cheaper back home!!!! Could not wait to build it when I get back home!

1/12th here we come!!!!

GUYS: any build tips? Parts that I have to buy or change?

Thanks!!

Lem
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Old 03-16-2003, 01:57 AM   #2586
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Quote:
Originally posted by stormperson
louis- thats a micro track! lol. no one really runs 6 cell 12th scales anymore since it really kills the tires (the car is so heavy) and you mind as well run mod to get more speed, or 19t (which all of tracks do now).

i would highly suggest the speedmerchant (either 6 or 4 cell version) since it does the best what you are looking for (quick transitions). also with the new front end coming out it will have plenty of steering to get around that track (right now the old style front end is great, but the v-force should be alot more adjustable to tune to each track, which in your case will help you out alot, since its far from your standard carpet track)
Thanks stormperson, We are allowed to run either 4 cell mod or 6 cell stock. Some people tried 4 cell but because the track is so small it's nearly impossible to keep smooth and they kept on running out of juice. It's not that difficult to dump a 6 cell pack of 2400s with a stock motor on that track!

The carpet is not ozite, it's english Primafelt which works great with UFRA pink medium fronts and pink soft rears. I've done 10 meetings so far, 320 mins racing and I've gone through 1 pair of front tires and I'm still on the rears I started with.

Do you think Speedmerchant will come out with a 6 cell car with the new front end?
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Old 03-16-2003, 06:30 AM   #2587
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they are not coming out with a new car, just a new front end (kinda different than all of the other companies, but the chassis's are both solid and proven, and really dont need much improvement, and then again there arent many things you can do). the front end will pretty much work on any car (speedmerchant or not) out there, the only thing that will be diferent for non speedmerchant cars is the piece that mounts onto the chassis.

if you can run 4 cell mod i would highly suggest it, since you will be faster (less weight) and with a track like that which requirs quick transitions i would highly suggest it. can you run 3300's? (since the GP's are probably cheaper than the packs you are currently running) if so i would highly suggest it, and maybe run a 19t motor instead of a full blown mod if you are still dumping.
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Old 03-16-2003, 06:50 AM   #2588
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Thanks, there's only 1 race to go this season and 33s will be legal for use well before the next championship. I'll ask around at the club to see what peoples' experinces with 4 cell have been like.
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Old 03-16-2003, 03:40 PM   #2589
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!!Dave Spashett-British 1/12th National Champion 2003!!
Dave won on max points followed by Phill Davies-2nd & Andy Griffens 3rd-which was exellent reult for Andy & Team Corally has its been his first season back after a cou[le of years long, brake.It was a shame for Phill Davies has he has seem to had trouble/bad luck what with back makers etc all season,but still did well to come 2nd!But man of the match for me this season is Andy Griffen's!!

(i came 2nd in the F3 championship-at my first season with 1/12th)

well thats it for us Brits,
hope to speak to you next season/October

Over and out
stevie

P.s.Its 4 cell all the way for me,who has ever won the A with 6 cell.?.in 2003?
* also you are living in the 90s by not using tyre addertives and you are not using a 12th to its full capacity with out tyre addertives,full stop**!

at the micro track above LOL try a 8-9double at 33mpr,50mm tyres

Last edited by Stevie; 03-16-2003 at 04:01 PM.
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Old 03-16-2003, 04:00 PM   #2590
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Stevie,
who one the F3 mate?
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Old 03-16-2003, 04:05 PM   #2591
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some bloke from bath ?@:"%*

over and out
stevie.

Loiuis:the bl**dy track we raced on today was tighter than your track & was twice has big..

Last edited by Stevie; 03-16-2003 at 04:19 PM.
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Old 03-16-2003, 04:13 PM   #2592
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No its not, but i do know him.
I take it he won the F3 then?
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Old 03-16-2003, 04:20 PM   #2593
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Yep
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Old 03-16-2003, 04:22 PM   #2594
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Most Excellent!
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Old 03-16-2003, 05:37 PM   #2595
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Quote:
Originally posted by lem2
hi! Just got 1/12th RC12L30!!!
From Ultimate Hobbies!!!!!!!!!
Hehehehehehe! Just could not resist even if I think its cheaper back home!!!! Could not wait to build it when I get back home!
1/12th here we come!!!!
GUYS: any build tips? Parts that I have to buy or change?
Thanks!!
Lem
I'm surprised to hear that there's enough oval racing in the Philippines that you'd buy a dedicated oval car. Are there banked oval tracks there?

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