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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 09-20-2009, 10:42 AM   #32161
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Quote:
Originally Posted by ds400 View Post
My question is as follows:

On asphalt how do I setup my screws on my tbar?
On the book its more for carpet racing and states to set the screw so that the slightly touch the chassis. Is that the case for asphalt racing as well???

Now when I look from underneath the rear pod, and push on the left rear tyre, then on the right does the rear pod need to "spring" back flat to the main chassis???

Thanks
Screws are the same for carpet and asphalt....rear pod should spring back to center.
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Old 09-20-2009, 05:19 PM   #32162
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Originally Posted by odpurple View Post
One of the main reasons front tires "gum up" is from heating up due to excess scrubbing. Too much rear traction may cause you to use too much steering (dual rate) which will heat up the fronts and cause the tires to glaze over. Try to get the amount of steering you need with as little steering input at the front as possible, this usually means freeing up the rear with a harder compound or stiffer set up. This is critical in stock classes since scrubbing tires slow the car down in the corner.

In Vegas I ran Gray rears and Lilac fronts. That was plenty of front tire for me and the rear was still stuck
Quote:
Originally Posted by avs View Post
thanks, losing speed in the corners is why i have been trying to use a softer front with less dual rate. i have been using black/yellow, i will try grey. if i stiffen the rear then it diffs out.
maybe i am misusing the term "gum up", what happens is that the untreated part of the tire gets a build up, which reduces the front grip (i mention this because others have described a 'gum up' and resulting grip increase) . on the softer tires this 'gunk' does not seem hot when it comes off the track, however on a purple tire it can be a little warm, this may be the 'gum up' effect you described?

Even a magenta tire gets this buildup on the untreated portion of the tire. this buildup will cause the front to lose traction thru the run. is this consistent with the overheating problem you mentioned?

i will try a further reduction in rear traction as you suggested, but i wanted to confirm we were describing the same situation.

Last edited by avs; 09-22-2009 at 07:57 AM.
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Old 09-20-2009, 06:27 PM   #32163
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After MANY years away from 1/12-(runnin anything from 1/8 to touring)I have the itchDo you think a 12l3 can be somewhat competitive in 17.5 carpet?
I know the car is an antique but my skilz are too.
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Old 09-20-2009, 07:17 PM   #32164
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Quote:
Originally Posted by CarbonJoe View Post
Joe,

That looks like a good solution, but do you think that a voltage regulator is really necessary? Servos and receivers in TC run off a 7.4v battery pack without a problem. Shouldn't our servos and receivers be okay in a 1/12?
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Old 09-20-2009, 07:38 PM   #32165
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Quote:
Originally Posted by Fuzzy View Post
Joe,

That looks like a good solution, but do you think that a voltage regulator is really necessary? Servos and receivers in TC run off a 7.4v battery pack without a problem. Shouldn't our servos and receivers be okay in a 1/12?
Servos and Rx run off 6v in TC. The BEC in your ESC converts the 7.4 to 6v.
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Old 09-20-2009, 07:48 PM   #32166
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Quote:
Originally Posted by Fuzzy View Post
Joe,

That looks like a good solution, but do you think that a voltage regulator is really necessary? Servos and receivers in TC run off a 7.4v battery pack without a problem. Shouldn't our servos and receivers be okay in a 1/12?
As Clegg indicated, the BEC in the ESC regulates the voltage down to 6V in the TC case. The difference here is that you are providing 7.2V directly to the Rx, which doesn't have a BEC. Thus, the answer to your question is more than likely yes. Some servos and Rx are more tolerant to voltages above 6V than others. To be safe, you should use one.
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Old 09-21-2009, 12:04 AM   #32167
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Default 1cell

A mate of mine just bought a bunch of these....
Anybody used these yet?

http://cgi.ebay.com/Intellect-Lipo-B...d=p3286.c0.m14

Where would i be able to get one cheaper? or is this the cheapest i will get it?

thanks
Alex
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Old 09-21-2009, 12:23 AM   #32168
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what voltage regulator would you recommend ?
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Old 09-21-2009, 01:42 AM   #32169
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http://www.shopatron.com/products/pr...=NOV5460/135.0
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Old 09-21-2009, 01:50 AM   #32170
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I'm looking for a 1/12 scale. Got a offer on a CORALLY SP12M, but how is it with 1s Lipo? Looks like the chassi won't hold a 1s.
Don't want to go back to nimh again.

Should i get another car or is there some modification that works to make 1s fit?
Is it possible to get parts for it still? Had a quick look on ebay and not much parts for it for sale.

It's either 1/12 or WGT... Not sure what to get.
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Old 09-21-2009, 05:19 AM   #32171
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Quote:
Originally Posted by RossoTorro View Post
I'm looking for a 1/12 scale. Got a offer on a CORALLY SP12M, but how is it with 1s Lipo? Looks like the chassi won't hold a 1s.
Don't want to go back to nimh again.

Should i get another car or is there some modification that works to make 1s fit?
Is it possible to get parts for it still? Had a quick look on ebay and not much parts for it for sale.

It's either 1/12 or WGT... Not sure what to get.
You can put it on 1 side of the chasis:

http://www.rc50.com/modules/coppermi...9/PICT9869.JPG
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Old 09-21-2009, 06:42 AM   #32172
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Quote:
Originally Posted by HaraR40 View Post
A mate of mine just bought a bunch of these....
Anybody used these yet?

http://cgi.ebay.com/Intellect-Lipo-B...d=p3286.c0.m14

Where would i be able to get one cheaper? or is this the cheapest i will get it?

thanks
Alex
I'm judging by your sig info that you're from Oz so this likely doesn't affect you, but it MAY be very significant to some racers here in the US and Canada.

As far as I can tell this battery is not currently on the ROAR approval list, and even if it were it would need the Trinity label on it as Trinity are the approved importer here. If your club doesn't rely on ROAR insurance it's a non-issue, but if your club DOES rely on that insurance this is one of those things with which compliance MUST be insisted upon. I don't know about your club, but ours doesn't have enough funds to re-build the Shrine should we manage to burn it down.

The current list of approved LiPo batteries is at http://www.roarracing.com/approvals/lipobattery.php

I can only identify three approved 1s batteries, the SMC 4000, the Fantom 5000 and the Thunder Power 5000. This isn't to say there isn't another one or two in there that aren't identified "single cell". This list is also likely to change between now and the end of the year as ROAR are allowing "open approval" of 1s until then.

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Old 09-21-2009, 06:52 AM   #32173
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Default hmmm

yeah i'm from OZ. we dont have a club that races 1/12th yet. Just a few of us are starting to get stuff together and trying to sort everything out. i am running 4 cell as OZ rules have no lipo class at all, let alone approved 1 cells. i thought the roar approved sticker on the battery would mean it had been through all the procedures with roar though.....

I will stick with 4 cell for a while anyway since i have 4 new packs. just looking towards the future. for the extra few dollars though i might get the SMC packs when i do go lipo. i like the way the have the ribs to fit in the battery slots.... not sure if intellect have this.

thanks
Alex
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Old 09-21-2009, 07:45 AM   #32174
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Quote:
Originally Posted by Scottrik View Post
I can only identify three approved 1s batteries, the SMC 4000, the Fantom 5000 and the Thunder Power 5000.
I thought few people ran SMC4900 pack at ICC.
Did ICC used different rules to ROAR?
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Old 09-21-2009, 12:23 PM   #32175
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I believe ROAR's website has not been updated with the current batteries. I ran the SMC 4900 packs with the internal bullet connector at the IIC and they ran very well.
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