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 02-05-2013, 10:36 AM   #39226
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by LloydLoar View Post
Anyone have experience running lilacs or purples instead of black fronts in higher traction conditions? If so, how do they perform? Any concerns about gumming up?
The Purple, Lilac, Dbl Pink, Magenta and to a lesser degree Pink family of tires all get gummy as they heat up.

If traction is low to medium you will be faster and get more steering with Magenta fronts.

If traction is really high and you need a more mellow feel Lilacs will work until they heat up and then your car will get hard to drive. If you are running 13.5 or Mod Magentas or Pinks are a better option. If you are running 13.5 or 17.5 Blacks are a better option.

Changing from one family of tire to another will usually require a setup change of some kind to keep the feel you like.
__________________
Adrian Martinez
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
AdrianM is offline   Reply With Quote
Old 02-05-2013, 11:26 AM   #39227
Tech Regular
 
Bikerbob's Avatar
 
Join Date: Jan 2006
Location: Ontario, Canada
Posts: 453
Trader Rating: 11 (100%+)
Send a message via ICQ to Bikerbob Send a message via MSN to Bikerbob Send a message via Yahoo to Bikerbob
Default

What about the Power cap effect on the speed??

I changed the power cap on the GTB from the Giant ass one to the smaller one that comes on the Havac, I was told it should be the same for 17.5t.

Now last night I ran the two 1s batteries I have both @10amps both dropped to 3.9v at start.. and then slowly declined. At 6min mark both were still about 3.8ish or just below.. at the 8min mark just below 3.7v - Both discharged to about 4900mah according to the ice charger - my cutoff was 3v

I have disassembled the car, motor, bearings, cleaned and will reassemble. MAYBE I missed a charge on sunday - aka I was running a battery from about 2500mah or so down.. so mid to end run I was @ about 3.4v or less??

This is different than a 7.2v battery - you can still get good power out of a motor @6.5v but when running a single cell boy do you notice it at 3.. whatever..

I will try again this weekend see what I get.

I am runnning a BMI12rr btw.. we also find at our track that car design really is not a factor in winning.. Older, newer, it comes down to setup and driver.
Bikerbob is offline   Reply With Quote
Old 02-05-2013, 11:38 AM   #39228
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

Power caps help keep you speedo cooler. Other than a cooler speed is more efficient there is no effect as far as speed.

I would suggest sitting down with a friendly local fast guy and ask for some help on a practice day.

The DB12RR is still a competitive car. There are a few of those as well as BMI Copperhead 12's that are as fast as the AE's and CRC's at my local track.

In WGT BMI Copperhead 10's are the dominant car at my track. Guys are selling their newer cars and scrounging Ebay and used for sale forums for used C10's.
__________________
Adrian Martinez
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
AdrianM is offline   Reply With Quote
Old 02-05-2013, 11:42 AM   #39229
Tech Champion
 
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,157
Default

Quote:
Originally Posted by Bikerbob View Post
6min or 8min heats? an 8min I am taking just over 2000 out.
1/12th scale heats are 8mins. I come off the track and my battery packs are right at the shut off for a storage charge.

Quote:
Originally Posted by howardcano View Post
No, the discharge curve is much more linear than what NiCads or NiMH were (they had a nice, long, flat center). The voltage will drop pretty steadily throughout a run. That's one reason why higher capacity LiPo cells are still an advantage with higher-turn motors. They have more voltage at the end of the run than a lower capacity LiPo would have.
Quote:
Originally Posted by Bikerbob View Post
SO if I am starting at 4.2v what should be my RUNNING voltage around it should drop to a certain point say 3.7v and sit there for almost the entire pack correct? then dump? is that 3.7 -6 -5.. whats average for a 1s 1/12 run?

James
What he said above.
InspGadgt is offline   Reply With Quote
Old 02-06-2013, 07:23 PM   #39230
Tech Regular
 
Join Date: Feb 2011
Posts: 304
Trader Rating: 5 (100%+)
Default 1/12 Newbie!

Hello all!

I recently bought a team associated 12r5.2, team orion r10 pro 1s, reedy sonic 4.5turn motor and reedy 6800 mah battery, and i was wondering if anyone had any tips for a new racer coming from offf road to on road racing after 2 years? setup tips? pit tips? Car build tips? and any information that would be helpful to me as iam looking foward to trying 1/12 on road racing!

Cheers Jackson.
jacko4309 is offline   Reply With Quote
Old 02-06-2013, 07:26 PM   #39231
Tech Elite
 
Join Date: Feb 2004
Location: Maitland, FL
Posts: 2,181
Trader Rating: 17 (100%+)
Send a message via AIM to Roberto Falcon
Default for sale

Corally slx 1/12 and gen x crc
__________________
Awesomatix USA - Speed Passion - Superior Hobbies
Roberto Falcon is offline   Reply With Quote
Old 02-06-2013, 07:30 PM   #39232
Tech Champion
 
Radio Active's Avatar
 
Join Date: Jun 2003
Location: Newcastle, Australia
Posts: 6,994
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by Roberto Falcon View Post
Good luck. All the serious 12th buyers have their eye on this: http://www.ebay.com/itm/rc10-0117-vi...item5d395a5c7d
__________________
Reigning NSW 4WD Group 20 Champion
Member: Maitland Radio Car Club (http://www.morcc.com.au)
twitter: @dvcotton
Australian 12th Scale hastag: #EP12AU
Radio Active is offline   Reply With Quote
Old 02-06-2013, 08:47 PM   #39233
Tech Addict
 
S.Stew's Avatar
 
Join Date: Feb 2004
Location: Michigan
Posts: 642
Trader Rating: 12 (100%+)
Default

Quote:
Originally Posted by jacko4309 View Post
Hello all!

I recently bought a team associated 12r5.2, team orion r10 pro 1s, reedy sonic 4.5turn motor and reedy 6800 mah battery, and i was wondering if anyone had any tips for a new racer coming from offf road to on road racing after 2 years? setup tips? pit tips? Car build tips? and any information that would be helpful to me as iam looking foward to trying 1/12 on road racing!

Cheers Jackson.
My suggestion? Shelf the 4.5 and run 17.5 or 13.5 for a while first. Mod 12th scale is one of the hardest classes in the RC world to master. Coming from off-road, its going to be an extreme learning curve.

Build tips, I like Mark Paynes blog:
http://markpayneblog.blogspot.com/

Everything else, I'm sure someone would link you to this thread:
12th Scale Racing is Alive and Well in So Cal

Good Luck and have fun! 12th scale is all about attention to detail and precision, but when it all comes together just right its a very rewarding class.
__________________
- Steven Stewart - Kawada USA
www.Kawada-USA.com
S.Stew is offline   Reply With Quote
Old 02-06-2013, 09:25 PM   #39234
Tech Adept
 
hunhunter's Avatar
 
Join Date: Aug 2012
Posts: 133
Default

*CLEAN* rc12 l4 pancar
__________________
Airtronics m11 2.4
Losi 8ight 2.0
Associated b4.1 wc
Hot bodies d8t
Associated sc10
hunhunter is offline   Reply With Quote
Old 02-06-2013, 11:03 PM   #39235
Tech Master
 
Join Date: Oct 2011
Location: Boulder, CO
Posts: 1,735
Trader Rating: 15 (100%+)
Default

Does anyone know what tire compounds were used by the A-main drivers for 17.5 and 13.5 12th scale at Snowbirds?

Everyone is saying the traction was unreal, so I am a little curious what tires everyone wound up using. Thanks for any help.
__________________
Chris Hillier | 5280 Raceway | www.5280raceway.com | Racing. Elevated.

Destiny | LRP America | Protoform | Xenon/JFT | Gravity RC | Motiv | Sanwa | Max.FX
LloydLoar is offline   Reply With Quote
Old 02-08-2013, 10:48 AM   #39236
Tech Fanatic
 
Join Date: Apr 2002
Posts: 793
Default

I just spoke to Ray Darroch and he said he ran JACO pink fronts and magenta rears in 13.5 to TQ. He thinks most guys ran a combination of pink and/or magenta. I will find out what Joe ran in 17.5 and post it.
We also tested some new compounds at the race with mixed success. It is nearly impossible to test tires at a major race. In fact, I didn't want them tested at the event. I simply sent them to a central location (Snowbirds) so my drivers could take them home to try. We tested 8 new compounds. Of these, we found 2 that were very intriguing. The other 6 were average. I will keep everyone up to date on these.
Ooops...just got a text from Ray....Joe ran JACO black fronts and orange rears in 17.5.
Jack Rimer is offline   Reply With Quote
Old 02-08-2013, 11:48 AM   #39237
Tech Master
 
jsinclair's Avatar
 
Join Date: Jul 2011
Location: rice lake, wi
Posts: 1,036
Trader Rating: 3 (100%+)
Default

I do belive wiita was running grey-lows and chromes.
jsinclair is offline   Reply With Quote
Old 02-08-2013, 12:27 PM   #39238
Tech Adept
 
SpeedMerchant's Avatar
 
Join Date: Jan 2005
Posts: 200
Default

Quote:
Originally Posted by LloydLoar View Post
Does anyone know what tire compounds were used by the A-main drivers for 17.5 and 13.5 12th scale at Snowbirds?

Everyone is saying the traction was unreal, so I am a little curious what tires everyone wound up using. Thanks for any help.

Hi,

Donny Lia ran JACO Pink front & rears to win the 13.5 A-main. The Pink rears give the car a little more rotation than Magenta rears.

Have a great day.-Bruce
SpeedMerchant is offline   Reply With Quote
Old 02-08-2013, 12:48 PM   #39239
Tech Master
 
Join Date: Jul 2011
Location: Austin, TX
Posts: 1,117
Trader Rating: 13 (100%+)
Default

I did some asking around at the Birds for tires in 17.5, just trying to find something that worked.

Wiita and Tony Block were on CRC Chrome/GreyLows. Ehrlich was on CRC Black/GreyLow(or at least was after his initial TQ run in Round 1). Stephen Boice was on Jaco Lilac/Orange. I heard Trandell was on Jaco Black/Orange, but do not know for sure. I believe Smyka was on BSR Grey/White(same as CRC Yellow). Robbie Dodge and Craig Xavier were running the Gravity tires... Robbie mentioned he was running Hard fronts/Soft rears. Not sure what Craig was running.
JamesL_71 is offline   Reply With Quote
Old 02-08-2013, 03:08 PM   #39240
Tech Champion
 
Radio Active's Avatar
 
Join Date: Jun 2003
Location: Newcastle, Australia
Posts: 6,994
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by JamesL_71 View Post
I did some asking around at the Birds for tires in 17.5, just trying to find something that worked.

Wiita and Tony Block were on CRC Chrome/GreyLows. Ehrlich was on CRC Black/GreyLow(or at least was after his initial TQ run in Round 1). Stephen Boice was on Jaco Lilac/Orange. I heard Trandell was on Jaco Black/Orange, but do not know for sure. I believe Smyka was on BSR Grey/White(same as CRC Yellow). Robbie Dodge and Craig Xavier were running the Gravity tires... Robbie mentioned he was running Hard fronts/Soft rears. Not sure what Craig was running.
Sounds like it was a case of pick your favourite tyre and run that.
__________________
Reigning NSW 4WD Group 20 Champion
Member: Maitland Radio Car Club (http://www.morcc.com.au)
twitter: @dvcotton
Australian 12th Scale hastag: #EP12AU
Radio Active 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: 4 (0 members and 4 guests)
 
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 11:47 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