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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 03-16-2002, 12:14 AM   #721
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Sorry to hear about the real motor blues dude. Look forward to seeing you at Norrca Nat's even if it just pitting for your brother. Well guys, it's been a loooonnng week up at the office just got in so time for that 11:00 report on the Indy race that I promised.
First basics: My car was setup with all stock parts save for the Associated T-bar and front .20springs. Started off doping tires for about 30min which worked well. Unfortunately by the second day (Fri.) I should have gone down to 5min on and 5min off like I did at Cleveland. I figured that the TQ8+ stuff didn't have enough traction compared to Paragon so I kept leaving it on too long and didn't correct for this mistake until Dave Chester told me mid-way through Sat. The result was that it aggrivated the traction roll problem that started coming on late Fri. as well as the "on edge" super quick reaction steering. Next: Integy motors were good. Even though this was course was more about chassis you still needed the power. I would have like to have seen a little more bottom end torque but considering the chassis delima I didn't focus on it but springs/timing/brush cut could have solved that issue I think. Tires: I re-learned that when the traction gets nasty at the big races several runs per set is a no-no especially doping them as long as I was doing for Thurs, Fri, and half of Sat. You must clean them out with motor spray after the first run and let them sit overnight to dry out so that you can get that last run on them the next day because more than twice gets them gummy so you increase your chances of traction rolling and also slow your car down some and lose some run time (if you think this is bad, rubbers are worse at big races because all of this is magnified). So tire strategy comes in a little bit and having a couple of sets to practice on and a couple to race on is a wise investment if possible. This doesn't mean that they can be run several times it only means that if you want a shot at the big boys don't plan on it. Initially I only made a damper shock spring change from my normal silver spring setup to the green spring due to the bumpy surface especially at the end of the straight and it really helped. Then begining on Sat. Dieter told me to change out the fiberglass spacer that I was using which is an Associated part or you take an old t-bar and cut off the "t" part and he had me replace it with the kit plastic washers. This helped by softening the rear some and giving it more traction. It still wanted to flip but not as bad. Next we took out the washers that I had under the pivot balls which lowers the rear roll center and this gave a little more rear traction and helped some more. Then Dieter gave me some harder Gray rears to try along with some harder front purples and this really helped to take the edgeyness away. Finally we lowered the rear roll center some more and that along with not letting the tire traction compound sit for so long did the trick. Unfortunately after all of this work I was accidently center punched into a board making a pass while being on a run that would have kept me in the "A" with only 2min to go in the 4th qualifier. This came after I had been accidently rammed from behind going around a crashed car into a board having to be marshalled in the first minute of the race of the same 4th quallifier. No biggey, just one of those racing deals and hopefully better stuff is in store at the Nat's this upcoming week. Any questions, thoughts, etc. post them and I will attend before I leave out on Wed at 5am for the Nats.-Dave Arnold. Again thanks to Dieter and Chester for all of their help and Sonny and his crew for a good time race.
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Old 03-16-2002, 12:19 PM   #722
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Up^^^ BTW, hope everyones racing goes well this weekend.
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Old 03-16-2002, 01:04 PM   #723
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what gearing would i use for a 12t motor running 4 cell and 6 cell
thanks
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Old 03-16-2002, 02:09 PM   #724
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hello dave.
IKE
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Old 03-16-2002, 02:36 PM   #725
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Hey guys, I got a SP12M Corally and was wondering what setups i should use. I ran the car box stock with heavy syrup. Here are a bunch of questions that I hope some of you could help me out with.

1. Car is pushing like crazy, what do i need to adjust to eliminate push?

2. How much syrup should I use on the rear pod?

I guess thats all I have for now, please email me your answers, will be very much appreciated for helping me out. Thanks!
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Old 03-16-2002, 06:48 PM   #726
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Darnold....sounds like a frustrating weekend......but, as they say...a bad day of racing is better than.....heck...pretty much anything......good luck at the Nats.....

Everybody post on Monday how your racing went...sound good?

The cross brace on the front end of my Assoc. reallly stiffens things up...gonna try it for the first time this weekend....
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Old 03-17-2002, 12:07 AM   #727
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wiley- for 4cell try a 28t pinion and 100 spur with 1.85" rears(for every .0500" up or down in size go up or down 1 tooth on the pinion to compensate). For 6cell I can only guess since I haven't run it in so long and as such I would try a 25t pinion and go from there based upon runtime with decent to good cells.

Boy I just re-read my post from Friday and all I can say is don't let my professor see it. All types of grammar/spelling mistakes, I really need to wait until I'm coherent when I post or maybe I should get home a day earlier from the office.heheheh

Foams- How'd it go? See you at the Nat's, let's go go-karting some? BTW who are you staying with at the hotel? Have room for another just in case? E-M me and let me know please.

Alfred- without knowing your camber/castor/spring/spring pre-load/ T-bar front ball position/ tweak screw use/ride height and tire doping scheme it's really hard to say.My guess would be this: 1 degree camber for this car then adjust based upon tire wear (should be close to even if not even) and 2deg castor. If they give you additional front springs try the second most firm set with light pre-load. Dope 3/4-all of the front tires along with all of the rears. For the rear damper setup only put syrup on the two damper pucks and DO NOT fill up the encasing. Lighter syrup will give more steering so if you "filled" up the encasing or used really heavy stuff try some Losi Medium Hydra fluid or even their Light Hydra fluid and this will also increase steering. Ultimately the setup sheets should tell you a good starting point and if that's not enough call or e-m Superior Hobbies in Florida and they will be glad to help you out.

Dragon S- Thanks, still lots to learn and gain experience in doing, your encouragement is greatly appreciated and at least I left faster than I came in. Tomorrow I will be replacing the T-Bar with a slightly thicker one (.077") and going through tires to try and match them up according to firmness and getting them trued for prep for the Nat's. Also a little fun practice and seeing what happens when I leave the .010" gap vs. shimming it under the springs to take leave in/take out play. Will also be replacing some of the purple screws in the rear pod section just in case. I tried the 10th scale front arms which raise the roll center on the front this past Monday before heading to the office and it made the car even easier to drive and would be really welcome when the grip gets nasty as it normally does at big races. I also found out when I put them on that I had "reamed" the normal 12th lower arms out too much and that's why my bottom pivot balls kept coming out on bad impacts like that 4th qualifier at Indy and in the main. We'll see how it runs.
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Old 03-17-2002, 12:26 AM   #728
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dave, you have a e-m screaming your way.
IKE
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Old 03-17-2002, 12:38 AM   #729
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Foams- Returned that serve with a backhand. hehehe
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Old 03-17-2002, 12:39 AM   #730
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**returns with a running backspin one-handed backhand**
ike
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Old 03-17-2002, 12:41 AM   #731
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Foams- Wow! Good thing I don't play tennis anymore. But Golf... how about a low stinger punch out... LOL
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Old 03-17-2002, 12:46 AM   #732
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**opens stance way up** **strikes ball well behind lie and pops it straight up in the air** **ball lands ten feet past the cup and violently accelerates back to the cup where it proceeds to make the most lovely plunk noise***
heheheh hows that?????? hehe
IKE

Last edited by FoamDonuts; 03-17-2002 at 12:51 AM.
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Old 03-17-2002, 12:47 AM   #733
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oh yeah and you have another email too if you didnt follow that last little riff.
IKE hehe
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Old 03-17-2002, 12:56 AM   #734
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Foams- I use less tire with the Trinity car than I did with the 6pack. It seems that I found out at both the Connecticut Jan. Jam race and the Indy race that the old 1.95" starting point is just too high at big races and so I am going down to 1.90" which is virtually what Josh is doing. Another critical point I found out is to keep the car level and keep it's ground clearance around 3mm. To do this with 1.90" rears I run the #1 cams down but once they get to about 1.83" for the rears I run the #4 cams down. For the fronts I was running the stock washer under the arm for 1.75" front tires. At the big races for the speeds we run in Mod I am finding that 1.72" fronts to start out with are better because they calm the car down some. As a result I am running a few thin washers that give about 1/8" more clearance to compensate for the smaller tires. I am also thinking that since I don't have magentas to run for the front tires that I will run soft purples in their place but only once so that means that I will save 4 sets for qualifying purposes plus another 3 for my last 3 practice runs. The initial practice runs on Wed/Thurs will be normal purples that I will re-run twice total.
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Old 03-17-2002, 12:59 AM   #735
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I thought you used a 1.85 starting point for the rears? Geez I guess my car is way off then. I can post your setup that you gave me originally so you can crosscheck it if you like.
IKE
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