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 12-16-2008, 06:01 PM   #29926
Tech Champion
 
robk's Avatar
 
Join Date: Aug 2001
Location: Macho Business Donkey Wrestler
Posts: 7,402
Trader Rating: 22 (100%+)
Default

Quote:
Originally Posted by SteveL View Post
Speaking of tires.....I've been out of racing for a while and I come back only to find a huge variety of compounds and wheel diameters to choose from. I see a bunch of guys running the new larger rims and cutting the foam down to nothing and saying that my old small rim stuff will not compete. CRC, Jaco & Parma brands, yellow, pink, grey, white & black rears. Magenta, Pink, Double Pink, Purple, ect. fronts.

What is everyone running these days (on a local level) for rim size and do you see a big difference from the older small rims? Seems crazy to me to buy something that is smaller out of the box than I would usually run. Is the extra $$ really worth it?

I was always under the impression that all the rubber came from the same manufacturer and that the harder stuff just came from the outter edges of the sheets and the softer from the center. Is it different now?

I've been running old Purple fronts and Pink rears for the last couple of weeks with good results but need to start thinking about new and not sure which direction to go. Your thoughts?
I have actually seen guys go back to the small rim stuff for club races where the traction was not cuckoo. I also have used a lot of the small rim stuff just to burn it up at club races. That being said i think the major advantage is at large events where the traction will be very high.

Here's a good explaination of the rubber:
http://www.teamcrc.com/crc/modules.p...article&sid=27

The Jaco yellow rear is a really good tire for 17.5/13.5. It sort of fits in between gray and white. CRC also sells the same rubber with an outer ring of gray to help with chunking, which is common especially on bumpy tracks.

The lilac front (kind of a soft purple) and dbl. pink fronts are good with the yellow rear for 17.5/13.5.

I have run dbl. pink-fr. and pink-r. for 10.5 quite a bit too. Just depends on the amount of traction at your track.
__________________
A mutually re-enforcing cascade of failure

"Failior [sic] crowns enterprise." Robert Goddard

I-Lap Scoring Systems http://www.rclapcounter.com/
robk is offline   Reply With Quote
Old 12-16-2008, 06:39 PM   #29927
Tech Fanatic
 
Join Date: Nov 2006
Location: St. Louis, MO
Posts: 904
Trader Rating: 23 (100%+)
Default

Traction at the local track is actually pretty good the first day on a new layout and after a week or two can rival a big race bite. The guys that went to Cleveland this year said that we have more bite at home than they did there. I can't imagine needing anything softer than Purple fronts. If anything, I would like to free up the rear a little as I'm running a t-bar car. Everyone else run links cars so I can't just go by what they run.
SteveL is offline   Reply With Quote
Old 12-16-2008, 07:15 PM   #29928
Tech Elite
 
theisgroup's Avatar
 
Join Date: Apr 2002
Posts: 3,191
Trader Rating: 10 (100%+)
Default

the jaco lilac and yellow combo is probably the best combo on track right now. It works both in high tracktion major races as well as club races. Most companies went to the large wheel because they are lighter. less rubber make the entire wheel lighter. also most are not cutting them real small anymore. at the IIC the "magic" size was 43.5 for the rear.

I have run the "old" tires as well as the jaco lilac/yellow combo. the lilac/yellow combo is faster, but I am still competative with the old tires. with the new brushless 17.5, the purple/gray combo seam to push. you can run a gray rear, but the yellow actually frees the rear end up. also the biggest that I would run would be a 46.5. anything bigger will rub a well mounted body.
__________________
yang lai

Team Tamale | Team Tekin | RCAmerica | Speedmerchant | Speedzone RC | EA Motorsports | Ko Propo USA | eXpress Motorsports | Parma/PSE
theisgroup is offline   Reply With Quote
Old 12-16-2008, 07:50 PM   #29929
Tech Champion
 
robk's Avatar
 
Join Date: Aug 2001
Location: Macho Business Donkey Wrestler
Posts: 7,402
Trader Rating: 22 (100%+)
Default

As the isgroup said, the softer rubber sometimes frees up the car. This happens with pinks sometimes too, the softer rubber twists more.
__________________
A mutually re-enforcing cascade of failure

"Failior [sic] crowns enterprise." Robert Goddard

I-Lap Scoring Systems http://www.rclapcounter.com/
robk is offline   Reply With Quote
Old 12-17-2008, 10:05 PM   #29930
CFR
Tech Regular
 
CFR's Avatar
 
Join Date: May 2007
Posts: 327
Default Grip Roll

if you use less addy on the rears, ie say 90% from the inside so that the outside edge has no addy do you think it would help stop grip roll?
CFR is offline   Reply With Quote
Old 12-18-2008, 01:07 AM   #29931
Tech Champion
 
Matt Howard's Avatar
 
Join Date: Aug 2001
Location: Abilene TX
Posts: 5,952
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by CFR View Post
if you use less addy on the rears, ie say 90% from the inside so that the outside edge has no addy do you think it would help stop grip roll?
superglue the sidewall of the front tires
__________________
Official member of The Guild of Calamitous Intent and proud supporter of Conjectural Technologies.
Serpent S411 LE kit #192
RCTech #361
Matt Howard is offline   Reply With Quote
Old 12-18-2008, 11:13 AM   #29932
Tech Apprentice
R/C Tech Elite Subscriber
 
Join Date: Apr 2006
Location: Poland Warsaw
Posts: 71
Default

I don't know how the softer tire can free the rear end. I would rather say that this would be the feeling of the rear end swinging.

In experience rather the change of tire compound helps sometimes ( same firmness but different tire composition) Ex . I use bsr tires . Last race we experienced that pink tires ( 30sh long life) that in most conditions provide a lot of grip were a complete mistake , the right choice was bsr WHITE ( 30sh carpet compound) but on most tracks white feels like freeing the rear end more.

But i never come across the situation that softer tire of the same compound family was freeing the rear end.

Last edited by blazeblazucki; 12-18-2008 at 11:47 AM.
blazeblazucki is offline   Reply With Quote
Old 12-18-2008, 11:27 AM   #29933
Tech Elite
 
theisgroup's Avatar
 
Join Date: Apr 2002
Posts: 3,191
Trader Rating: 10 (100%+)
Default

yellow and grays are different compound tire. so that is why a softer shore frees the rear end up
__________________
yang lai

Team Tamale | Team Tekin | RCAmerica | Speedmerchant | Speedzone RC | EA Motorsports | Ko Propo USA | eXpress Motorsports | Parma/PSE
theisgroup is offline   Reply With Quote
Old 12-18-2008, 02:44 PM   #29934
Tech Prophet
 
Randy Caster's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2003
Location: Irvine, CA
Posts: 16,665
Trader Rating: 45 (100%+)
Default

Does anyone have a suggestion for a good file for rounding the edge of tires?
Randy Caster is offline   Reply With Quote
Old 12-18-2008, 02:54 PM   #29935
Tech Master
 
JamesArluck's Avatar
 
Join Date: Jul 2003
Posts: 1,232
Trader Rating: 52 (100%+)
Send a message via AIM to JamesArluck
Default

Quote:
Originally Posted by Randy Caster View Post
Does anyone have a suggestion for a good file for rounding the edge of tires?
Perma-grit files..
JamesArluck is offline   Reply With Quote
Old 12-18-2008, 04:06 PM   #29936
Tech Prophet
 
Randy Caster's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2003
Location: Irvine, CA
Posts: 16,665
Trader Rating: 45 (100%+)
Default

Thanks James. On their website they have hand files in coarse and fine grits, I am assuming those would be the ones to use?

The only other thing I see would be the large needle file which looks like it has a different grit material on it...
Randy Caster is offline   Reply With Quote
Old 12-18-2008, 04:13 PM   #29937
Tech Master
 
JamesArluck's Avatar
 
Join Date: Jul 2003
Posts: 1,232
Trader Rating: 52 (100%+)
Send a message via AIM to JamesArluck
Default

I have the large flat file without a handle that has the coarse grit on one end and the fine grit on the other. Typically the fine grit is enough, but sometimes the coarse side helps for harder tires like Purples. They also make an "L" bent file that's a bit narrower that helps get into tight areas on some truers.

What 12th scale are you planning on running?
JamesArluck is offline   Reply With Quote
Old 12-18-2008, 04:19 PM   #29938
Tech Regular
 
DPowell's Avatar
 
Join Date: Apr 2003
Location: Denver, CO
Posts: 454
Trader Rating: 3 (100%+)
Default

Quote:
Originally Posted by Randy Caster View Post
Does anyone have a suggestion for a good file for rounding the edge of tires?
A "shoe rasp" from Home Depot. Inexpensive and effective.
__________________
www.powellracingcomponents.com
**Record setting carbon fiber**

Speedmerchant and TOP USA dealer.
DPowell is offline   Reply With Quote
Old 12-18-2008, 05:07 PM   #29939
Tech Master
 
Join Date: Nov 2003
Location: Arlington, Texas
Posts: 1,052
Trader Rating: 16 (94%+)
Default

Quote:
Originally Posted by Randy Caster View Post
Does anyone have a suggestion for a good file for rounding the edge of tires?
What you need is a Carbide Grit Half Round File. One came with my used Hudy Truer. The "Half Round" works well since you get a flat surface on one side and round on the other.

Here is an example I found on the web:
https://www.buckandryan.co.uk/produc...25/sn/DRP29390


Carbide Dragon Stick
http://www.kamikazetoysandhobbies.co...od=DRAGONSTICK
__________________
KSN
kn7671 is offline   Reply With Quote
Old 12-18-2008, 05:50 PM   #29940
Tech Addict
 
Join Date: Nov 2001
Location: Minot, ND
Posts: 717
Trader Rating: 5 (100%+)
Default file for rounding tires

We found a good file for rounding the edges and taking the gator tread or grit off of the surface of the tire is a carbide tile file available at Menards and probably other places. Very similar to what kn7671 has a link to at buckandryan. Some people like to use a diamond sanding pad or plate to put a final finish on the tires and get them to perform like they would after running them for a few minutes and not aggressive like they would be if you just cut them and put them on the track.
buttsy 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 07:38 AM.


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

SEO by vBSEO 3.5.0