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 11-26-2006, 04:53 PM   #22036
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

Jason didn't mention that BMI DB12's finished 2-3-4 at this race.

1. JR Mitch (Factory AE Driver)
2. Jason Breiner (The "B" in BMI)
3. Adrian Martinez (me)
4. Tim Caporal (Owner of Fast Track Hobbies in Orlando
__________________
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 11-26-2006, 05:00 PM   #22037
Tech Lord
 
protc3's Avatar
 
Join Date: Jun 2003
Location: Spring Hill,Florida
Posts: 10,813
Trader Rating: 13 (100%+)
Default

my bad Adrian. everyone was friggin fast in 1/12th.jr mitch,mike bruce,shad galante,mark burt,tim,you.man,my nerves were shot after the main bro.that was some race.i almost got em in the end if those pipes didnt get in my way .i missed it by 1 second. it was close from 1st-4th.congrats to you tim and jr.you guys were all smokin fast
__________________
Jason Breiner
BMI Racing
Team Associated
J Concepts
protc3 is offline   Reply With Quote
Old 11-26-2006, 08:10 PM   #22038
Tech Champion
 
JayBee's Avatar
 
Join Date: Mar 2004
Location: 12TH-MAN COUNTRY
Posts: 6,803
Trader Rating: 31 (100%+)
Default

Quote:
Originally Posted by Anthony.L
Offer it minus the front end so we can order the new CRC Pro-Strut front end.
Can you buy the CRC Pro-Strut front end complete?
__________________
R C 3 G R A F I X _ F U S I O N . G R A P H I X _ S E A T T L E - R/C - R A C E R S _ E M E R A L D C I T Y R C . C O M

A E - 12R5.2 _ S M - REV8 PRO
JayBee is offline   Reply With Quote
Old 11-26-2006, 10:01 PM   #22039
Tech Champion
 
JayBee's Avatar
 
Join Date: Mar 2004
Location: 12TH-MAN COUNTRY
Posts: 6,803
Trader Rating: 31 (100%+)
Default

I have a couple of pics for you gurus out there of my electronics layout on a car I ran at a big 2-day'r a weekend ago. The car was good but I couldn't overcome the glitchin' problems all weekend (I did try a few things to remedy this). The car is fine with a fresh pack but about 5-6min into the run, I would gun the throttle and nothing; a sec later the car would take off. As long as I was on throttle somewhat the car 'seemed' okay but trying to go full-off to full-on was a no-no. The car was freshly built for this race series w/ new electronics so maybe you guys can point out something I'm not seeing. I'm almost at the point of taking everything out and replacing with fresh gear
__________________
R C 3 G R A F I X _ F U S I O N . G R A P H I X _ S E A T T L E - R/C - R A C E R S _ E M E R A L D C I T Y R C . C O M

A E - 12R5.2 _ S M - REV8 PRO

Last edited by JayBee; 09-12-2008 at 10:33 PM.
JayBee is offline   Reply With Quote
Old 11-26-2006, 10:06 PM   #22040
Tech Adept
 
Join Date: Dec 2003
Posts: 102
Default

Quote:
Originally Posted by tff014
I am new to 12th scale and am looking for some advise regarding what kit to buy. I'm sure this has been done many times over but i'd like some input. I am interested in the following kits any info would be much appreciated. I've raced sedan for many years but a carpet track has popped up in my area so on to 12th scale. Thanks

1. CEFX c12 (newest version with the assc. front end)
2. CRC Generation X
3. CRC T fource
4. Associated 12l4
The Gen-X kit is awesome. My car went together real easy. The new front end is extremely simple to build and super smooth. I like the quick battery changes with the O-ring and the cool transponder mount area.

T-bar cars are so fragile, one shot in the wall with the rear tire usually results in a broken t-bar. The Gen-X is the car to have in 1/12th.
insideline is offline   Reply With Quote
Old 11-26-2006, 10:08 PM   #22041
Tech Elite
 
odpurple's Avatar
 
Join Date: Dec 2002
Location: San Francisco
Posts: 2,187
Default

Quote:
Originally Posted by JayBee
Can you buy the CRC Pro-Strut front end complete?
#3240 - CRC Pro Strut Front End 1/12th
__________________
TOP Racing USA--OD Racing--Novak--Power Push--J Spec
odpurple is offline   Reply With Quote
Old 11-26-2006, 10:24 PM   #22042
Tech Addict
 
Join Date: May 2005
Location: California
Posts: 605
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by JayBee
I have a couple of pics for you gurus out there of my electronics layout on a car I ran at a big 2-day'r a weekend ago. The car was good but I couldn't overcome the glitchin' problems all weekend (I did try a few things to remedy this). The car is fine with a fresh pack but about 5-6min into the run, I would gun the throttle and nothing; a sec later the car would take off. As long as I was on throttle somewhat the car 'seemed' okay but trying to go full-off to full-on was a no-no. The car was freshly built for this race series w/ new electronics so maybe you guys can point out something I'm not seeing. I'm almost at the point of taking everything out and replacing with fresh gear
Might have something to do with your rear t-bar pivot
__________________
www.freerice.com
Help hungry people while learning.
smojoe is offline   Reply With Quote
Old 11-26-2006, 10:35 PM   #22043
Tech Champion
 
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,157
Default

Quote:
Originally Posted by JayBee
I have a couple of pics for you gurus out there of my electronics layout on a car I ran at a big 2-day'r a weekend ago. The car was good but I couldn't overcome the glitchin' problems all weekend (I did try a few things to remedy this). The car is fine with a fresh pack but about 5-6min into the run, I would gun the throttle and nothing; a sec later the car would take off. As long as I was on throttle somewhat the car 'seemed' okay but trying to go full-off to full-on was a no-no. The car was freshly built for this race series w/ new electronics so maybe you guys can point out something I'm not seeing. I'm almost at the point of taking everything out and replacing with fresh gear
I see no reason why you should be glitching. The Spektrum system should smooth all that out. The only thing I did notice is the new micro Spektrum reciever that you are running allready has internal capacitors so the external one is not needed.
InspGadgt is offline   Reply With Quote
Old 11-26-2006, 11:24 PM   #22044
Tech Champion
 
JayBee's Avatar
 
Join Date: Mar 2004
Location: 12TH-MAN COUNTRY
Posts: 6,803
Trader Rating: 31 (100%+)
Talking

Quote:
Originally Posted by smojoe
Might have something to do with your rear t-bar pivot
Brian Bodine of Slapmaster fame would have my azz in a sling if I let the cat outta the bag of a new prototype part we're experimenting with
__________________
R C 3 G R A F I X _ F U S I O N . G R A P H I X _ S E A T T L E - R/C - R A C E R S _ E M E R A L D C I T Y R C . C O M

A E - 12R5.2 _ S M - REV8 PRO
JayBee is offline   Reply With Quote
Old 11-26-2006, 11:29 PM   #22045
Tech Champion
 
JayBee's Avatar
 
Join Date: Mar 2004
Location: 12TH-MAN COUNTRY
Posts: 6,803
Trader Rating: 31 (100%+)
Talking

Quote:
Originally Posted by InspGadgt
I see no reason why you should be glitching. The Spektrum system should smooth all that out. The only thing I did notice is the new micro Spektrum reciever that you are running allready has internal capacitors so the external one is not needed.
Yeah I know but the glitching is with AND w/o the external Spektrum cap. I've ran with Spektrum from day one and outta 10-12 cars I've ran the system in, this is a first
__________________
R C 3 G R A F I X _ F U S I O N . G R A P H I X _ S E A T T L E - R/C - R A C E R S _ E M E R A L D C I T Y R C . C O M

A E - 12R5.2 _ S M - REV8 PRO
JayBee is offline   Reply With Quote
Old 11-27-2006, 12:24 AM   #22046
Tech Elite
 
odpurple's Avatar
 
Join Date: Dec 2002
Location: San Francisco
Posts: 2,187
Default

Quote:
Originally Posted by JayBee
Yeah I know but the glitching is with AND w/o the external Spektrum cap. I've ran with Spektrum from day one and outta 10-12 cars I've ran the system in, this is a first
Mr B
I'm sure, from our conversation, that you are experiencing a voltage drop upon acceleration. Why this is I am not sure. Maybe someone on the thread has seen this before and can help. I would try a different reciever and/or esc to see if one or the other is out of spec. I've built maybe fifteen cars with Spektum without this problem, so I don't think its endemic.
__________________
TOP Racing USA--OD Racing--Novak--Power Push--J Spec
odpurple is offline   Reply With Quote
Old 11-27-2006, 01:40 AM   #22047
Tech Elite
 
nashrcracer's Avatar
R/C Tech Charter Subscriber
 
Join Date: Nov 2001
Location: LA - Lower Antioch
Posts: 4,849
Trader Rating: 1 (100%+)
Default

cefx takes stock 12th and 19t 12th andwas leading mod at the us indoor champs. t bar cars rule
discuss
__________________
RC50 As you come into this world, something else is also born. You begin your life, and it begins a journey towards you. It moves slowly, but it never stops. Wherever you go, whatever path you take, it will follow never faster, never slower, always coming. You will run, it will walk. You will rest, it will not. One day, you will linger in the same place too long you will sit too still, or sleep too deep. And when, too late, you rise to go, you will notice a second shadow next to yours. Your life will then be over.
nashrcracer is offline   Reply With Quote
Old 11-27-2006, 02:24 AM   #22048
Tech Addict
 
Thraex's Avatar
 
Join Date: Nov 2004
Posts: 518
Default

Quote:
Originally Posted by JayBee
Yeah I know but the glitching is with AND w/o the external Spektrum cap. I've ran with Spektrum from day one and outta 10-12 cars I've ran the system in, this is a first
About the voltage drop OD spoke about.
Maybe you could try a capacitor on the esc to smooth out the voltage ripple.
The capacitor should be a 'High frequency Low impedance' version with a working voltage greater than 10v and a capacitance of about 2200uF.
You can buy it at your local electronics store.
In case you don't know how to connect it, the leg nearest the grey stripe is the cathode and should be soldered to the - from the battery, the other leg should be soldered to the + from the battery.
I have no experience with Keyence esc's so I don't know if it works, but it should work with every esc. And it's worth to try since they are so cheap.
__________________
Thijs van M[HPI/HB]
Thraex is offline   Reply With Quote
Old 11-27-2006, 09:26 AM   #22049
Tech Elite
 
Mr. Shookie's Avatar
R/C Tech Charter Subscriber
 
Join Date: Sep 2004
Location: The Wilderness
Posts: 4,713
Trader Rating: 9 (100%+)
Send a message via AIM to Mr. Shookie Send a message via MSN to Mr. Shookie
Default

Hey Jay......

I had the same issue runnig four cells with my KO VFS.
I had to go into the program and set the voltage differently to allow for the lower voltage of the 4 cells. Not sure if that makes much since but since I put in a receiver pack in I haven't had a problem.
I got a sweet ultra light lipo receiver pack but roar hasn't made up their minds about that yet...Still holding my breath..LOL

Hope your killa em Jay....
-Shookie <><
__________________
All who love the LORD JESUS I praise with you.1 Cor 10:31
Team HOLY Rollers (Team Manager)
The Church is a Hospital for Sinners not a Museum for Saints.
RcTech Feedback <>< RC Tech Subcriber #92
Mr. Shookie is offline   Reply With Quote
Old 11-27-2006, 11:11 AM   #22050
Tech Fanatic
 
fast-ho-cars's Avatar
 
Join Date: Sep 2003
Location: it's a dry heat
Posts: 781
Default

Quote:
Originally Posted by nashrcracer
cefx takes stock 12th and 19t 12th andwas leading mod at the us indoor champs. t bar cars rule
discuss
what type car did the winner use in mod? masters?

are the final results posted anywhere?

as for discussion...there was alot of talk about the track last year favoring link cars (bumps, etc.) and from the talk/posts in the 2006 Indoor Champ Thead, it appeared that the track was sub-par.....? i am now surprized to see your post....i thought the links would rule again.

anyone know out of the 40 cars used in the 4 different class a-mains what the car type/brand choice breakdown was? Tires? Motors? Batterys?
fast-ho-cars 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: 1 (0 members and 1 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 01:03 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