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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 06-26-2008, 06:24 PM   #28921
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Quote:
Originally Posted by Fred_B View Post
As much as I'd like to think that LiPo is getting closer for 12th it's not. Until we have a LiPo pack that can run with the 4 cell NiMh stuff head to head just like 6 cell it just doesn't make sense. I can't see a good way to mix LiPo with 4 cell when the voltage is so different.

I think that if we decide to go with LiPo it's got to happen for the entire class. We can't mix these things and we don't need another class out there.

My personal feeling is that we need to start with a capacity limit (frozen for a set time with the battery manufacturers involved) and run 6 cell voltage. Also, I think we need a standard cell size that will fit saddle and inline cars.

By limiting the capacity to say 2000 mAh we will limit the speed of the cars. You'll have to gear to finish the race and use strategy to get to the end just like we did in the old days. No more running flat out for 8 minutes and more driving and strategy will make the class more interesting. The beauty of limiting the capacity is that LiPo runtime is fairly stable so there isn't as much difference between the "big names" and the average joe.

Just my thaughts.
Good thoughts. My thought is that, since we have had battery run time that means anyone can go fast for eight minutes, 12th has increased in popularity. I, for one, wouldn't want to go back to a time when people tried 12th, and gave it up because they found making run time so difficult, it spoilt their racing.

LiPo as a technology is great stuff, but it is really a solution to a TC problem, not any other electric class. Off-Road can't take advantage of its light weight, and 12th/Oval can't use its voltage. If I look across all electric racing, LiPo is still a minority usage, with little possibility for expansion.

We've found EP and EnerG cells to be as good as the old NiCads used to be - don't lose voltage in storage, don't mind a bit of heat in use, and last a long time. 12th and NiMh have a good future, especially if people like Fred_B can be so positive about it.
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Old 06-26-2008, 07:01 PM   #28922
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Quote:
Originally Posted by vafactor View Post
At some point (maybe soon and maybe not) somebody may come forth with a lipo powered 1/12th scale solution that's fast and that handles great. If and when that happens, then it will be time to discuss if or how to accommodate such a ride within the racing rules. But that has yet to happen. On the upside, at this time there's more great 1/12th scale cars than ever to choose from and the class does seem to be growing and building some momentum and interest. I choose to celebrate that this is happening and to welcome the new participants to the class. For me, I'll stick with my CRC car(s) because they work great, the quality is there, and the support is unmatched. But I enjoy and appreciate all other designs. The main thing is that we get together and have good solid competitive racing at a sensible cost. And right now, 1/12th scale is better than ever with respect to affordability, ease of operation, and available choices. Long live the little cars! Let's race.
Quote:
Originally Posted by SlowerOne View Post
You know of only two, perhaps those of us telling you that the issue is weight might know of more? And, perhaps, that means we are answering your question correctly by saying that LiPo has no current future in 12th until it solves the weight and size issues?

Just because a technology works in one area, does not mean it works in every area. LiPo is a technology that works replacing NiMh as a power source. However, from a handling point of view it doesn't work! In Off-Road, everyone over here is having to add weight to the car to retain handling. In TC, they are also adding weight to make it work.

I suppose we are a bit short with some of these replies, so apologies. However, when we tell people it won't work, we get the never-ending replies telling us that LiPo is the future and it must work. Please accept that LiPo as a technology is not the future for pan cars.
oh, I hung onto my cell cycling gear for a while. And then I woke up and started running lipo. In the North East, Lipo is dominating the TC and Dirt scene. Throwing on some weights isn't a big deal and actually gives you more adjustability.

Just look around and try to find GOOD cells.... And by good I don't mean looking at whatever number was thrown on the pack. Cells are getting harder to get and once a 1/12th pack is produced you'll all be talking about weight distribution and adapting just like everyone else.

2 cents.
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Old 06-26-2008, 08:25 PM   #28923
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The new cells are sooo much better than what we had. Things got better around Cleveland time last year and the cells are holding up a lot better. A lot of guys were running one pack at the big races and you only need two for club racing.

I'm all for running LiPo in 12th but it needs to have an advantage over what we have now. And that doesn't mean that they need to go faster than NiMh. Stock is already fast enough that most new people can't handle it.
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Old 06-27-2008, 04:22 PM   #28924
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JASON, Thank you for all of your information reguarding your DB12R. Many people have given their opinion on you car and I have got nothing but praise on your coustomer service and quality. I will be ordering a DB12R for this upcoming season within a week. Just on a courious note, do you plan on coming out with a newer version or any hopups for the car so I am not ordering to soon. Thanks kindly, WIITA
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Old 06-27-2008, 05:57 PM   #28925
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Thanks alot buddy. I really appreciate the kind words.


We are not looking at anything new at the moment. I have always had a problem with keeping new parts secret so you guys will know when i have new stuff happening.

Our existing car was really carefully developed early on so we could keep any changes to a minimum. I like to try to get it as close to perfect on the 1st shot.
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Old 06-27-2008, 07:45 PM   #28926
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thank god, i dont have the money to buy a new 1/12th every few months.
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Old 06-27-2008, 08:08 PM   #28927
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Old 06-28-2008, 05:22 AM   #28928
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Default lipo for 1/12

does anynone run 12th with lipo?
Or know one lipo which coulld fit into on a 12th or dimension ?
nimh make me crazy, i'm upset whith sell of nimh which dy after 30 cycles or blow up!
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Old 06-28-2008, 07:35 AM   #28929
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Read back 2 or 3 pages, there was a big discussion on it.
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Old 06-30-2008, 03:31 PM   #28930
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Just a general tech question (new to 12th) regarding the center shock.

What effects happen on the car when running the shock with more or less spring tension?

I run on Asphalt and we run only stock class.
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Old 06-30-2008, 03:36 PM   #28931
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Lighter spring = more rear traction, better for bumpy tracks
Stiffer spring = less rear traction, better for smooth(carpet) track
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Old 06-30-2008, 03:39 PM   #28932
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Here is a link to a site the explaines this and other 1/12 adjustments.

http://richardchang.com/hobby.php?topic=112setup
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Old 07-02-2008, 12:13 PM   #28933
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Default -- :: -- vantomme e12 -- :: --

Hi,
proud to present the new vantomme e12 :

rctech / vantomme car designs

Grtz,
Benedict.
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Old 07-02-2008, 12:19 PM   #28934
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Does your tyres wear faster in the front or the rear?
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Old 07-03-2008, 07:31 AM   #28935
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Quote:
Originally Posted by Benedict View Post
Hi,
proud to present the new vantomme e12 :

rctech / vantomme car designs

Grtz,
Benedict.
Hi,
Two more pics :-)
grtz, B
Attached Thumbnails
1/12 forum-vantomme-e12-6-.jpg   1/12 forum-vantomme-e12-7-.jpg  
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