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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 01-23-2006, 03:44 PM   #17011
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Quote:
Originally Posted by azmio
matt

the scoop helps. just like you wrote before, the fan will be just below the bodyshell. by making some opening, the fan can have some breathing space to discharge the hot air. My friend suggested me this and I thanked him a lot for the idea because it solved my thermal shutdown problem. With 5.5 running at full blast, I need more than a fan to solve my problem.

Perhaps, with 4 cells and an air scoop, you may not need a fan anymore.
Thanks for the information. Now that I moved the GTB right next to the center shock mount, the body fits. I will be curious to see what temps I get (I will find out this weekend) but right now the rollout is pretty low. That should help keep the temps down.
Thanks,
Matt
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Old 01-23-2006, 03:47 PM   #17012
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Quote:
Originally Posted by alf.skaar
What version off the software are you runing in the radio Nomadio Sensor
and what servoe are you using digital og analog
and are you using the v2 reciver (Transceiver)

Thanks
Alf
Hi Alf,
Using the beta software available on the Nomadio site. Steering servo is digital. And yes, I am using the V2.
Let me know if you have anymore questions.
Thanks,
Matt
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Old 01-23-2006, 03:52 PM   #17013
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I want a dollar for everytime gearchart.com is mentioned in this thread.....
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Old 01-23-2006, 04:39 PM   #17014
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Quote:
Originally Posted by mpetrich
I want a dollar for everytime gearchart.com is mentioned in this thread.....
I betcha harshguy does as well, it's O.K. though, he's already rich
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Old 01-23-2006, 05:49 PM   #17015
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Quote:
Originally Posted by MattW
Can anyone tell me how to easily build/bleed a Silva centre shock?? I can't seem to get the correct amount of oil in it. Either too much and it obviously locks, or too little and clearly plenty of air - anyone got a good method.

If i can get this sorted, i have to admit it seems like a much better quality shock than the std one.

Cheers
1. I always start by filling the shock up to the point on the inside of the shock where the threads start.
2. Then I ever so gently push the shock rod and piston down into the shock body filled with oil. Donít forget to soak the foam in the same weight oil.
3. Once the piston is bottomed out, I slowly move the piston up and down in the shock to make sure I have moved any trapped air bubbles to the top. Be careful not to bring the piston too far out of the shock body as you will suck air in and have to start over. You might cause oil to flow out the top in this process but that's ok.
4. Then just place on the threaded shock body cap over the piston rod and start to thread the cap into the shock body. Only thread the cap on about one turn or so. This will cause oil to bleed out but that's ok.
5. Then push the piston down to the bottom of the shock body while the cap is slightly threaded into the shock. If the piston rod does not come back out by itself, then screw the cap down a little more until the piston rod starts to move out on itís own.
6. Press the piston rod back down a couple of times to force out any excess oil.
7. Then thread the cap down into the shock body a little more. When the piston rod starts to automatically come out the top, stop and push the piston rod back down into the shock body a couple of times. If you thread the cap down too far, the piston rod will not go down into the shock body. If this happens, just back the cap out slightly until the piston is able to easily bottom out in the body.
8. Repeat this process over and over until the shock cap is treaded down finger tight and the piston rod will slowly back out of the shock body after you press it down into the shock.

It takes a little practice but it's not bad once you get the hang of it.
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Old 01-23-2006, 07:46 PM   #17016
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Are 2 bolt wheels still available? If not, my smokin deal just went up in smoke! That 3 bolt axle out of a 12L3 I was given doesn't line up... it's wider than my pod and it looks like the tires will hit... new pod pieces would fix it, but I might as well pick up a used 12L3 for the difference.

Whats the oppinion on the 12L3 axle? Is it junk? I see the 12L4 has gone back to a solid with a clamp. Is it worth spending the extra to get a 12L4 over the 12L3? I am only club racing with about 8 other cars.

Thanks for the help
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Old 01-23-2006, 07:48 PM   #17017
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how do i shim the rear axle so that it is in the center of the car and to the proper width.
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Old 01-23-2006, 08:29 PM   #17018
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You can put thin shims up against the bearings on the axle...I hope I'm answering your question?
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Old 01-23-2006, 09:44 PM   #17019
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Scott, you could just use a straight edge down the middle of the car and then mark that on the bottom of the pod. Now just measure how far each side (tire) is out from that center mark. Or measure the outside of the tire to the rear chassis body posts. They should be equal on both sides.
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Old 01-23-2006, 10:08 PM   #17020
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Great description of setting up a shock Crashby. Even I got it!

One other contribution that needs to be credited is from Mark Payne's 1/12th Scale RC Notes at http://markpayneblog.blogspot.com. Mark's article on "Building the Associated L4 Type Front End" is absolutely spot on.

Mark describes using the best parts and what to do to them to build an outstanding front end for your 1/12th scale. Made a big improvement for my Rev 4 when I went from the old style to new style front end. Many thanks Mark.
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Old 01-24-2006, 03:37 AM   #17021
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Crashby, cheers for that, the problem i had, was that as i screwed the cap in, even when not fully there, the seal was making a near full seal and wouldn't let any oil bleed out. I've got it sorted now i think.
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Old 01-24-2006, 05:32 AM   #17022
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Quote:
Originally Posted by mpetrich
Hi Alf,
Using the beta software available on the Nomadio site. Steering servo is digital. And yes, I am using the V2.
Let me know if you have anymore questions.
Thanks,
Matt
Thanks
one more

What type off servo is it ?

Alf
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Old 01-24-2006, 05:50 AM   #17023
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gmintimidator,

I had the hollow axel on my CK and hated it. It was too fragile for someone of my skill level. Any decent hits on a board will crack them and there is no way that I have found to repair them.

The new larger D ring diff with the solid axel is pretty much bullet proof and the diff action is silky smooth with just a little sanding on the rings.

Greg
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Old 01-24-2006, 06:42 AM   #17024
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Quote:
Originally Posted by gmintimidator
Are 2 bolt wheels still available? If not, my smokin deal just went up in smoke! That 3 bolt axle out of a 12L3 I was given doesn't line up... it's wider than my pod and it looks like the tires will hit... new pod pieces would fix it, but I might as well pick up a used 12L3 for the difference.

Whats the oppinion on the 12L3 axle? Is it junk? I see the 12L4 has gone back to a solid with a clamp. Is it worth spending the extra to get a 12L4 over the 12L3? I am only club racing with about 8 other cars.

Thanks for the help
BSR makes tires that will work on both 2 and 3 bolt hubs. You can get them from www.lefthander-rc.com
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Old 01-24-2006, 06:52 AM   #17025
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Where is the best place to order parts for my yokomo 1/12? Also what body should I order. THanks
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