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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 03-02-2010, 03:12 PM   #33691
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What does that voltage booster do?
Do you use it instead of an extra battery just for the reciever and servo?
And does it work better than an extra battery?

I have a LRP SXX Competition ESC, and the manual says that it has an BEC output voltage of 6.0volts. But is this only if it has 4,8volts or more connected from the battery?

If it deliveres an BEC of 6volts regardless of how many volts the battery gives, then it should not be necessary with a booster or extra battery?

Can anyone help with this?
I only need to work this problem out, to get my car running.
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Old 03-02-2010, 03:43 PM   #33692
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If you know anyone looking for a BMI 1/12 in mint condition and very fast. I habve a great deal on one here: BMI DB12RR LE(lipo edition)
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Old 03-02-2010, 08:29 PM   #33693
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Quote:
Originally Posted by Frank-DK View Post
What does that voltage booster do?
Do you use it instead of an extra battery just for the reciever and servo?
And does it work better than an extra battery?

I have a LRP SXX Competition ESC, and the manual says that it has an BEC output voltage of 6.0volts. But is this only if it has 4,8volts or more connected from the battery?

If it deliveres an BEC of 6volts regardless of how many volts the battery gives, then it should not be necessary with a booster or extra battery?

Can anyone help with this?
I only need to work this problem out, to get my car running.
The voltage booster "boosts" the voltage to provide your other electric equipment (receiver, servo and transponder) with a useable voltage. It is for those running a 3.7 single cell LiPo battery.

I have been using a TQ boost module for 6 months and have had zero problems wtih it.
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Old 03-02-2010, 08:42 PM   #33694
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Hi Everyone, thanks a lot for all the comments!

I think im gunna get my hands on some of the manutech ones and give them ago. Good to see im not the only person who liked the fit of the hotbodies ones (although i havent broken one yet, touch wood... actually maybe hope not to touch the wood).

BTW i did actually look at HBOnline because they had some kind of moving sale unfortunately they dont even list the part im looking for, those are the old ride height adjusters which only come in 1mm increments
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Old 03-02-2010, 08:47 PM   #33695
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Wanted to put a couple paint pics in here to add some color, hope you guys don't mind, . These are "simple level".

...sorry that they are cell phone pics though.






...Jim
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Old 03-02-2010, 10:08 PM   #33696
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Quote:
Originally Posted by W.E.D.Jim View Post
Wanted to put a couple paint pics in here to add some color, hope you guys don't mind, . These are "simple level".

...sorry that they are cell phone pics though.

W.E.D.
www.wedjim.com
good lookin' stuff Jim!!!
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Old 03-03-2010, 02:24 AM   #33697
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Originally Posted by CypressMidWest View Post
good lookin' stuff Jim!!!
+1

Nice looking bodies and indeed they brought some colour into this topic
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Old 03-03-2010, 12:16 PM   #33698
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Default Another Servo ???

I am trying to decide between 2 different servos. Futaba S9650 & Airtronics 94819.
The specs on the Airtronics is 1.26 x .63 x 1.26, .92oz, 33oz/in, .07/60.

The specs on the Futaba are 1.4 x .6 x 1.1, .9oz, 63oz/in, .11/60.

Airtronics stated that the 94819 is the new replacement for 94141 & 94145 (noted in the GenXL instruction manuel).

I see most are using the Futaba. Are the specs on the Airtronics acceptable?I also notice a little size difference. Need to know if any alterations would be needed to make it fit?
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Old 03-03-2010, 12:39 PM   #33699
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[QUOTE=svines1972;7085643]I am trying to decide between 2 different servos. Futaba S9650 & Airtronics 94819.
The specs on the Airtronics is 1.26 x .63 x 1.26, .92oz, 33oz/in, .07/60.

The specs on the Futaba are 1.4 x .6 x 1.1, .9oz, 63oz/in, .11/60.

Airtronics stated that the 94819 is the new replacement for 94141 & 94145 (noted in the GenXL instruction manuel).

I see most are using the Futaba. Are the specs on the Airtronics acceptable?I also notice a little size difference. Need to know if any alterations would be needed to make it fit?[QUOTE]

I run a JR and love it! If I had to chose between the two you have listed, I would go with the Airtronics. Both of these will fit without modifications to the car.
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Old 03-03-2010, 01:21 PM   #33700
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Quote:
Originally Posted by svines1972 View Post
I am trying to decide between 2 different servos. Futaba S9650 & Airtronics 94819.
The specs on the Airtronics is 1.26 x .63 x 1.26, .92oz, 33oz/in, .07/60.

The specs on the Futaba are 1.4 x .6 x 1.1, .9oz, 63oz/in, .11/60.

Airtronics stated that the 94819 is the new replacement for 94141 & 94145 (noted in the GenXL instruction manuel).

I see most are using the Futaba. Are the specs on the Airtronics acceptable?I also notice a little size difference. Need to know if any alterations would be needed to make it fit?
I think one of the main differences is in the price. The futaba is most likely less expensive and works extremely well. I've been running one for a couple of years with no issues.

I like the JR servo as well. I don't have any experience with the new airtronics servo.
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Old 03-03-2010, 01:53 PM   #33701
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Airtronics 94819 - $36.99
Futaba S9650 - $59.95
JR Z3650 - $89.99

The reason I am questioning this is the price. Would they all be equal in durability in 12th car? The price on the Airtronics is quite a bit cheaper.
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Old 03-03-2010, 02:51 PM   #33702
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Quote:
Originally Posted by svines1972 View Post
Airtronics 94819 - $36.99
Futaba S9650 - $59.95
JR Z3650 - $89.99

The reason I am questioning this is the price. Would they all be equal in durability in 12th car? The price on the Airtronics is quite a bit cheaper.
Hm, my bad, the airtronics used to be the servo to use back in the day, I recall my first 1/12 (assoc. L3) I used the 94145 or something like that which I changed to the JR since CRC drilled their servo holes for that servo.

For $37 go ahead and give it try. Like I said I haven't used them in a while. Mostly JR and Futaba.
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Old 03-03-2010, 03:34 PM   #33703
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Can anyone help me with a little discussion i'm having with a fellow racing buddy..?

He says that the following setup will never work. I say it will..

Setup is:
LRP SXX Competition with 16AWG motor wires, and 14AWG battery wires.
LRP Vector X12 4Turn.
Reedy 3,7Volt 40C 4600mAh LiPo Battery.
96T Spurgear
19T to 27T Pinion

Does this setup work or will the ESC get overloadet with that motor?
LRP specs say Motorlimit at 6,0Volts: 4 Turns.
But i only use 3,7Volts (4,2Volts when fully charged).
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Old 03-03-2010, 11:36 PM   #33704
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Hi M8 in run 1/12, what is the tyre roll out,this is what is needed,with a 4 turn motor you should run 28-30 mm rollout.I ran a LRP X12 but 4.5 the other day,ower track is outdoors and ended up running 32 mm rollout.Also to run this 4-4.5 motors you really need to look at what settings you are running on the speedy,the first time my settings caused the motor to cog, I had not felt this before ,the motor was like a 10.5.So after resetting my speedy up (KO- BCM) ,it was good just need to reset the car up went from a 10.5 to a 4.5.
To work out the rollout use this link http://www.rcracing.com/Gear_Ratio_Program_1100.cfm

Cya
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Old 03-04-2010, 07:09 AM   #33705
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Sorry M8 but i don't understand much of that

I am prettym new in 1/12 racing.

Rollout, is that tire diameter?

My ESC and motor are brand new. So i haven't done anything to it yet.
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