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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 01-20-2005, 12:21 PM   #10396
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It's been my experience that both the speed 12 and the Ascari have too much downforce for stock. The speed 12 seemed to be better for me but your results may vary.

CEFX has a new body that works really well but it may not be available everywhere yet.

The Parma speed 8 is still the best body that I've found for stock.
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Old 01-20-2005, 12:26 PM   #10397
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Pro Ten if you really have that much traction.I would recommed,going to a 5degree caster block instead of the 10 degree block(going to the 5degree will take out alot of the initial bite going in the turn,so that should help some and widen the frt should do the rest).also if you put the calandra front axels on the car that has the nut on it you can widen the frt end(placing shims behind the wheel to bring it out) and that will help alot with the traction rolling.and once you do that you can try narrowing the rear abit to get the car to rotate quicker.
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Old 01-20-2005, 12:34 PM   #10398
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I have the CRC axles on the car. The CRC front rims are a pain to put on with the C-clips. I will try narrowing the rear. I'll also try some heavier grease in damper discs, combined with some more traction compound up front. This might help, altough I'm afraid I will need to use more throttle to keep the speed up in the corners (run time, run time, run time).
I will experiment with all of your suggestions next sunday.
Thanks for the advice guys!
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Old 01-20-2005, 12:57 PM   #10399
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Only 5 months until the US Pan Car Championships!! I hope many of you 12th scalers are considering coming out and showing the world just what they are missing with pan car racing.
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Old 01-20-2005, 01:04 PM   #10400
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Pro-widen the frt end put .040 on each of(ive also used a flanged bearing on the inside too to help widen the frt) the axle and than the wheel Ive had mine as wide as .060 on each side and it stopped the traction rolling along with using 5degree caster blocksdont try narrowing the rear until you get the frt settled first it might frustrate you
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Old 01-20-2005, 01:40 PM   #10401
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I had an ascari and found that it was perfect going straight but when you want to make a sweeping turn on the throttle it couldnt make it.
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Old 01-20-2005, 01:45 PM   #10402
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Quote:
Originally posted by nmt6789
I had an ascari and found that it was perfect going straight but when you want to make a sweeping turn on the throttle it couldnt make it.
try cutting those hole out in the rear wing of the car. It helped mine a lot. Bascially in a fast sweeper, the rear had soo much down force it was pulling the front of the car up. this made it inconsistent lap to lap and lost a lot of steering. Cutting the holes out of the rear, reduces that downforce and settled the car down in fast sweepers.
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Old 01-20-2005, 02:46 PM   #10403
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I used to race the ascari body and I really liked the handling of it. I then switched to the speed 12 body and gained 2 laps from my personal best run. The speed 12 had better downforce all the way around and suits my driving style well.
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Old 01-20-2005, 08:44 PM   #10404
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hey guys. it time to replace my L3. and im undecided on which one to get. im leaning towards the corally sp12 anoheim edition since thats what the fast guys are running at my local track. do u guys have any recommendations? whats the fast car in ur track?
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Old 01-20-2005, 08:49 PM   #10405
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Default IRS has done it again!

IRS has new .015 front suspension spacers, PN IRS4017. With their new rear ride height adjusters and .030 front suspension spacers ride height adjustments will be easier. Not to mention save us money in the long run, due to not having to true tires down as often.
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Old 01-20-2005, 09:34 PM   #10406
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Quote:
Originally posted by dakrat
hey guys. it time to replace my L3. and im undecided on which one to get. im leaning towards the corally sp12 anoheim edition since thats what the fast guys are running at my local track. do u guys have any recommendations? whats the fast car in ur track?

12l4 cheap and fast
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Old 01-20-2005, 10:09 PM   #10407
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Default Re: IRS has done it again!

Quote:
Originally posted by P2
IRS has new .015 front suspension spacers, PN IRS4017. With their new rear ride height adjusters and .030 front suspension spacers ride height adjustments will be easier. Not to mention save us money in the long run, due to not having to true tires down as often.
If you don't feel like being overcharged $2.00 for 8 washers, you can go to www.mcmaster.com and order part number 98017A624 Stainless steel washers 0.174"ID, 0.375"OD, 0.014" thick, and the best part is the price. Only $8.92 for 500 washers!!

-James
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Old 01-20-2005, 11:23 PM   #10408
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Default Re: Re: IRS has done it again!

Quote:
Originally posted by JamesArluck
If you don't feel like being overcharged $2.00 for 8 washers, you can go to www.mcmaster.com and order part number 98017A624 Stainless steel washers 0.174"ID, 0.375"OD, 0.014" thick, and the best part is the price. Only $8.92 for 500 washers!!

-James
Hi James,

The ones you gave me are great. I see several applications for these washers. Can I get something like a hundred of them this Saturday. Will be most happy to pay for your lunch too!

Many thanks.
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Old 01-21-2005, 11:23 AM   #10409
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Default T-bar Pod mount

I was just looking through some old setup sheets and came across one of Mike Lufaso's from 2002 Snowbirds.
On that sheet he went from 3 washers with 0.125" spacing, then to 2 washer 0.090" to washers. Wasn't any comments about the different setup's.
I need to play with this adjustment some more and get the feel of it.

take care
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Old 01-21-2005, 01:44 PM   #10410
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Default Re: Re: IRS has done it again!

Quote:
Originally posted by JamesArluck
If you don't feel like being overcharged $2.00 for 8 washers, you can go to www.mcmaster.com and order part number 98017A624 Stainless steel washers 0.174"ID, 0.375"OD, 0.014" thick, and the best part is the price. Only $8.92 for 500 washers!!

-James
Yeah but the steel washers weigh twice as much
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