R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

    Hide Wikipost
Old 10-28-2016, 12:43 PM   -   Wikipost
R/C Tech Forums Thread Wiki: 1/12 forum
Please read: This is a community-maintained wiki post containing the most important information from this thread. You may edit the Wiki once you have been a member for 90 days and have made 90 posts.
 
Last edit by: fenton06
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:

Print Wikipost

Reply
 
Thread Tools Search this Thread
Old 10-13-2003, 04:29 PM   #4381
Tech Addict
 
sands's Avatar
 
Join Date: Sep 2003
Location: Iowa
Posts: 620
Default

It is actually for an xray TC. But 1/12 scale guys usually know more than TC guys. Just wondering if any of you have heard of one. I can't bring myself to shave .15 inches off $40 of touring foams. I'm gearing about .08-.12 inches too long right now and need a bigger spur.

BTW, I also run a 1/12 CK.

Sands
sands is offline   Reply With Quote
Old 10-13-2003, 04:31 PM   #4382
Tech Addict
 
sands's Avatar
 
Join Date: Sep 2003
Location: Iowa
Posts: 620
Default

oh yeah, that last post was the explanation for me looking for a larger than 128 /64p spur.

Sands
sands is offline   Reply With Quote
Old 10-13-2003, 05:00 PM   #4383
Tech Master
 
stormperson's Avatar
 
Join Date: Sep 2001
Location: MA
Posts: 1,185
Trader Rating: 1 (100%+)
Send a message via AIM to stormperson
Default

You probably want to true those tires down anyway. Normally on sedan I cut down to 2.30 before I even run them, and I shave off normally .1 on my 12th scale tire as well. Cars normally do not run well with large tires, it is like having large sidewalls on a full scale car. The car will scrub alot of speed in the corner and handle funny since its digging in, instead of floating ontop of the track.
__________________
R/C Excitement Special Projects Coordinator
Kwik | Speedmerchant | Parma PSE | KO Propo
Team Pickles
stormperson is offline   Reply With Quote
Old 10-13-2003, 05:22 PM   #4384
Tech Addict
 
sands's Avatar
 
Join Date: Sep 2003
Location: Iowa
Posts: 620
Default

you're probably right. Last season of on road that I ran was about 10 years ago. Back then we only had green and blue and a couple of other compunds. Green dots would only last about 4 race weekends. It seams as thought the purples and greys will last 1/2 season with practice thrown in.

I'll probably true them down so I can run the smallest pinions that will fit in the Xray comfortably. (The belts will hit the motor if you go too small)

sands

Sands
sands is offline   Reply With Quote
Old 10-13-2003, 08:13 PM   #4385
Tech Fanatic
 
Join Date: Nov 2002
Location: seattle, WA
Posts: 864
Default

When I accelerate from a slow speed or from a dead stop my car spins to the right. Usually not very helpful when you make a mistake and slow way down and than accelerate too hard and swing into the boards again . I was thinking I could try going up on a pinion tooth, or mabey try green springs on both sides of my motor. Currently I'm running a monster stock with red +/ green - spring combo. Very fast. But the acceleration is almost too good. What do you guys think?
racerdx6 is offline   Reply With Quote
Old 10-13-2003, 08:28 PM   #4386
Tech Elite
 
Join Date: Sep 2001
Location: Minnesota
Posts: 3,549
Trader Rating: 68 (100%+)
Default

Guys,

The new Trinity 12th scale is a BAD MUTHER. Saw Doseck's car and it is DIALED..................... Looks super trick.
RBLove is offline   Reply With Quote
Old 10-13-2003, 09:16 PM   #4387
Tech Initiate
 
XRaycer's Avatar
 
Join Date: Sep 2003
Location: Colorful midwest
Posts: 45
Default

speedxl- Thanks again for the set up insight car worked good. If I could've kept it off the pipes I'd have had a better chance. Took second in the"A" (stock).
XRaycer is offline   Reply With Quote
Old 10-13-2003, 10:04 PM   #4388
Regional Moderator
 
disaster999's Avatar
 
Join Date: Aug 2001
Location: Hong Kong
Posts: 2,842
Trader Rating: 1 (100%+)
Default

Quote:
Originally posted by sands
This is what I use for rollout. You'll need a set of calipers to get tire diameter.

Sands
thanks...i never know how to read these charts...it gives me all these roll outs but which one should i really use?
disaster999 is offline   Reply With Quote
Old 10-13-2003, 10:08 PM   #4389
Regional Moderator
 
disaster999's Avatar
 
Join Date: Aug 2001
Location: Hong Kong
Posts: 2,842
Trader Rating: 1 (100%+)
Default

Quote:
Originally posted by stormperson
You probably want to true those tires down anyway. Normally on sedan I cut down to 2.30 before I even run them, and I shave off normally .1 on my 12th scale tire as well. Cars normally do not run well with large tires, it is like having large sidewalls on a full scale car. The car will scrub alot of speed in the corner and handle funny since its digging in, instead of floating ontop of the track.
thats true...but for us college boys...every single penny counts...so im just gonna run my tires down till its so small i cant pass tech
disaster999 is offline   Reply With Quote
Old 10-13-2003, 10:17 PM   #4390
Tech Elite
 
speedxl's Avatar
R/C Tech Charter Subscriber
 
Join Date: Jun 2003
Location: Portland Oregon.
Posts: 3,876
Default

xraycer congratulations i figured you would like the setup wasnt it smooth
you might want to try a stiffer front sring if traction were to come up on the track and you start traction rolling like .22 .
other wise that set up i gave you is a good starting point were ever you go and all you have to do is minor adjustments if conditions change.


another happy prc quad 12 driver good job xraycer!
__________________
Pemberton / R1 / All out motorsports / Team Power Push
speedxl is offline   Reply With Quote
Old 10-14-2003, 04:25 AM   #4391
Tech Addict
 
Join Date: Mar 2002
Posts: 593
Default DX6,

Check your diff for smoooooth and make sure your rear end is centered onthe back of your car. Wheels should be exactly the same distance from the center of the car. You can't have too much stock motor.
David Root is offline   Reply With Quote
Old 10-14-2003, 11:10 AM   #4392
Tech Master
 
Casey's Avatar
 
Join Date: Aug 2001
Location: Md
Posts: 1,503
Trader Rating: 5 (100%+)
Default

Racer DX
your car is probally tweaked, what kind of car do you have,
tweaked means one of the rear wheels have more weight on it than the other

Casey
Casey is offline   Reply With Quote
Old 10-14-2003, 11:43 AM   #4393
Tech Addict
 
sands's Avatar
 
Join Date: Sep 2003
Location: Iowa
Posts: 620
Default

Quote:
Originally posted by disaster999
thanks...i never know how to read these charts...it gives me all these roll outs but which one should i really use?
There are a number of slides, each one is for a different spur gear. The left hand column is tire dirameter and the top row is spinion size. The middle of the matrix is the inch rollout. For tight tracks you want to be in the 0.7-0.85 range, for fast tracks from 0.8 to 0.95 ish. You need to do this from experience and what kind of motor you run. GM3s will be geared much shorter than a P2K2. Depends on where the power band is on the motor.

Anyway, measure your tire diameter, this will give you the row to look at. Then pick the rollout you want to run. You may need to look at different pages to pick the right spur gear. Once you find out where you want to be with the spur you want to run, then pick the pinion to match. With newer grey dot rears, they will wear very slowly. You can probably stick with the same pinion and spur for one race day. If you true between races, then you'll need a different gear combination to stay at the same rollout.

These charts let you run the same rollout for different tire sizes. So as your tires wear, your car will accelerate the same and have the same run time.

This is one of those details that you need to pay attention to in order to be competive on 1/12 scale class. Oh, yeah, run consistent lines and don't crash, that helps too. LOL

Sands
sands is offline   Reply With Quote
Old 10-14-2003, 11:44 AM   #4394
Tech Addict
 
sands's Avatar
 
Join Date: Sep 2003
Location: Iowa
Posts: 620
Default

BTW, the rollout chart is on page 146.

Sands
sands is offline   Reply With Quote
Old 10-14-2003, 01:45 PM   #4395
Tech Fanatic
 
Join Date: Nov 2002
Location: seattle, WA
Posts: 864
Default

I have a Carpet Knife 3.1. But I'm sure it's not that the car is tweaked. Because I just set it right before I ran the last time. But the car will only spin to the side when I accelerate hard from a dead stop or slow speed. But drives straight all of the rest of the time. I'm pretty sure the rear wheels are just slipping. But I will check the tweak and everything next time I run. But I'm pretty sure its not that.
racerdx6 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
New to the forum mig rod Electric Off-Road 1 01-05-2008 05:23 PM
hi i need help and im new to the forum racer4 Rookie Zone 4 01-21-2007 02:37 PM
Why is this forum listed under the On Road Forum? sport10 Onroad Nitro Engine Zone 0 01-11-2007 08:06 AM
Forum Changes... futureal Wisconsin & Illinois Racing 3 10-28-2002 09:26 PM



Currently Active Users Viewing This Thread: 6 (5 members and 1 guests)
Johnny Carey, Larryscooterman, RcHammer
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 06:56 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net

SEO by vBSEO 3.5.0