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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 05-03-2005, 08:41 PM   #12991
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hey guys looking at going to the US pan car champs in San Antonio. reviewed the rules and was wondering what you guys thought. It looks like they are going to run 4 anc 6 cell 1/12 in the same classes. The 6 cells do have to meet min weight requirements. I still don't think that will be a fair race. especially for mod. what are your thoughts.

I know there was a discussion a few weeks ago, but not sure what happened in that one.

TIA
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Old 05-03-2005, 08:45 PM   #12992
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i think it got changed to just 4 cells
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Old 05-03-2005, 08:45 PM   #12993
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Well Crashby,

I'll be looking to tell you to..... pluck off!

It's going to be a lot of fun, we may even get teo full finals worth if you three come out. Brad Murata is making sounds about joining the 12th fray, we are looking good to go.

Last Saturday Charlie had a faster lap (.02 faster) than me but didn't deal with the traffic as well in the final. It was a great day of racing. With 6 of us with a chance of top glory it will either be great or just a bloodbath.

Take it easy Steve.
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Old 05-03-2005, 08:47 PM   #12994
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Quote:
Originally posted by mtc3od
i think it got changed to just 4 cells
looking at http://www.uspancarchamps.com/forums/ they say they are running both in the same class, but they are not set on that yet. but that was about 1 month ago. no other updates
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Old 05-03-2005, 08:52 PM   #12995
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Well they say that everything is bigger in Texas... so what better place to host the 1st ever United States Pan Car Championships. The race will be held April 28-May 1 2005 at the Hobbytown USA in San Antonio.



Classes offered will be:

Pro10 6 cell stock

Pro10 6 cell modified

Pro10 4 cell 19T GT1/GTS

Pro12 4 cell stock

Pro12 4 cell modified

NASCAR 6 cell stock

NASCAR 4 cell 19T

NASCAR 6 cell modified

12th scale NASCAR 4 cell stock

12th scale NASCAR 4 cell modified




This was on another thread
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Old 05-04-2005, 08:17 AM   #12996
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A semi rookie question....

I am thinking of getting a 1/12th car purely because I'm hoping my guess is correct....

not that the racing is easier but it takes a lot less time to work on your car than my current TC does so I'll have more track time (and not have to spend hours getting a free running transmission)?

As for cars I admit I have no clue except for what looks good to me so would either of these cars....

CRC "Bloody Knife" I think it's called or an RC12L4 be suitable for racing on asphalt?

The other thing is I use 540 stock motors (and 1500mah cells) in my TC at the moment, so for a while at least I'd want to use one of these in a 1/12th car with 1500mah batteries (made into 4 cell packs of course lol).

So I'm wondering is it possible to gear a 1/12th high enough with a 540 to get,...shall we call it..."not entirely embarassing speed" out of it and make it last 8 minutes?

Thanks in advance.
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Old 05-04-2005, 09:33 AM   #12997
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Default Re: A semi rookie question....

Quote:
Originally posted by Mabuchi540
I am thinking of getting a 1/12th car purely because I'm hoping my guess is correct....

not that the racing is easier but it takes a lot less time to work on your car than my current TC does so I'll have more track time (and not have to spend hours getting a free running transmission)?

As for cars I admit I have no clue except for what looks good to me so would either of these cars....

CRC "Bloody Knife" I think it's called or an RC12L4 be suitable for racing on asphalt?

The other thing is I use 540 stock motors (and 1500mah cells) in my TC at the moment, so for a while at least I'd want to use one of these in a 1/12th car with 1500mah batteries (made into 4 cell packs of course lol).

So I'm wondering is it possible to gear a 1/12th high enough with a 540 to get,...shall we call it..."not entirely embarassing speed" out of it and make it last 8 minutes?

Thanks in advance.
You have picked out two different types of cars. One is a link car (CRC) the other is a T bar car (12L4). You have also opened the can of worms over which is better. Both cars have their positive and negative points and both will work on asphalt. I think for your needs go with what ever your local hobby shops have in stock for parts support.

As far as using 1500 mah batteries, you would have to gear it so low (numerical high) that it would be crawling around the track and would not be much fun for you. With the appearance of 3700 mah batteries, you should be able to find some really good deals on 3300 batteries. If you buy two six cell match packs of 3300 and you can be assured that the numbers on the cells are close between both packs, you can get two packs that are matched and a third pack that should be matched close enough for effective use. Three packs, if used appropriately on race day, can get you through a day of racing.
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Old 05-04-2005, 05:14 PM   #12998
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chris,

look at this link http://www.uspancarchamps.com/forums/viewtopic.php?t=68

they are running roar rules and roar says 4 and 6 cell in same class with a weight penalty for the 6 cells.

so how many of you 4 cell guys going to this race?
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Old 05-04-2005, 05:22 PM   #12999
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Quote:
Originally posted by theisgroup
chris,

look at this link http://www.uspancarchamps.com/forums/viewtopic.php?t=68

they are running roar rules and roar says 4 and 6 cell in same class with a weight penalty for the 6 cells.

so how many of you 4 cell guys going to this race?
It is being held at my local track, down here in Texas. Any questions about the track, I can probably comment. Also, I will be running a CRC Carpet Knife 3.2R at the race.

-Mike Patterson
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Old 05-04-2005, 05:26 PM   #13000
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hey mike,

this is yang in dallas. so how do you think the 4 cells are going to stack up with the guys running 6. also what is the tire combo that you guys are running down there? not sure how many of us are making it down, but I am

also in mod, what rurn motors you guys running and still make runtime. I know carpet zapps the batts a little more.

thanks
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Old 05-04-2005, 05:44 PM   #13001
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theisgroup,

I'm not going to be able to make it, I just don't have the vacation time and the money really. I'd have to drive down which would be two days each way and that would be fairly unpleasant as it's about 1700 miles. It would be fun as I'd like to meet a few people down there but it is not on the cards at the moment.

Chris
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Old 05-04-2005, 07:06 PM   #13002
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Quote:
Originally posted by mtc3od
Well they say that everything is bigger in Texas... so what better place to host the 1st ever United States Pan Car Championships. The race will be held April 28-May 1 2005 at the Hobbytown USA in San Antonio.



Classes offered will be:

Pro10 6 cell stock

Pro10 6 cell modified

Pro10 4 cell 19T GT1/GTS

Pro12 4 cell stock

Pro12 4 cell modified

NASCAR 6 cell stock

NASCAR 4 cell 19T

NASCAR 6 cell modified

12th scale NASCAR 4 cell stock

12th scale NASCAR 4 cell modified




This was on another thread
Like I told theisgroup, it's ROAR rules. Whatever it says in the rulebook, that's how we are running
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Old 05-04-2005, 07:55 PM   #13003
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Quote:
Originally posted by theisgroup
hey mike,

this is yang in dallas. so how do you think the 4 cells are going to stack up with the guys running 6. also what is the tire combo that you guys are running down there? not sure how many of us are making it down, but I am

also in mod, what rurn motors you guys running and still make runtime. I know carpet zapps the batts a little more.

thanks
Hey Yang,
I don't believe I have met you, probably would recognize you though. (were you at the champ. race at Mike's in dallas a couple months ago?) Anyways:
1) Batteries: Worried about that myself. Although some guys down here tried 4-cell versus 6-cell in there cars, and they were faster with 4 because their cars were so much more agile in the turns.
2) Tires: Mainly pinks (rear) and purples (front). I am going to run my new car this weekend for the first time, and I bought pinks, purples, and magentas. I will try all of them and let you know how it works (when I used to race 12th, I ran pinks and purples).
3) Motors: When I ran 12th, and the guys who are fast that run now, run 9x2 or 9x1's. I will be running a 10x2 at the race, just because that is all I could get my hands on...I will just gear to the moon . To answer your question though, 9x2 and you will be fine on runtime if you have decent 3300's at our track.

-Mike
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Old 05-04-2005, 08:24 PM   #13004
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hey mike

I was there. I won the b main in 1/12. I was the one that mike was making fun of on the stand. Had bad qual and never could get my head out of my butt that saturday. having a new chassis probably did not help either

I have decent batts. but I seam to dump about 7:20-7:30 with a 10x1 on carpet. hoping that the asphalt will be a little more forgiving on batteries. We don't have an outdoor track so will be there all day friday to work on setup. I only have a few pairs of magentas. on carpet for mod, that was just way too much to handle. but I can see where you might need a little more on asphalt. I will wait to here what you find out. and maybe even a setup to start from. I will be running a tbar car, but the front end should be close. also if there are guysthere with a tbar car, can you check with them if they are running the softer bar? I will have to order some of those since on carpet we run nothing but the stiffy.

thanks again.
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Old 05-04-2005, 11:16 PM   #13005
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Default Re: Re: A semi rookie question....

Quote:
You have picked out two different types of cars. One is a link car (CRC) the other is a T bar car (12L4). You have also opened the can of worms over which is better. Both cars have their positive and negative points and both will work on asphalt.
Mind if I ask what those +/- points are? And which of them would be best out of the box with a kit set up (if they have one that is)?

And do the diffs take standard 48p spurs so I could use my Yokomo spurs and pinions?
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