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 05-29-2008, 11:24 PM   #28786
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 The Bear View Post
speed 12 for 17.5 vegas?
17.5 is pretty much the same speed as 27T, so i'd go with the 8 over the 12.
JamesArluck is offline   Reply With Quote
Old 05-30-2008, 04:42 AM   #28787
Tech Champion
 
hanulec's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2007
Location: @ the post office
Posts: 8,015
Trader Rating: 23 (100%+)
Default

Quote:
Originally Posted by JamesArluck View Post
17.5 is pretty much the same speed as 27T, so i'd go with the 8 over the 12.
at vegas I'm going to bring both speed 8 and 12 but a body is really fine tuning and personal preference as both are great. I'd like a more realistic body but the speed bodys work the best.

if you have never run 1/12 17.5 I'd recommend building up your 76t to 82t spurvand 47t to 53t pinion collection. I have different irs axles for each spur to continue to match rollout with tire wear.
__________________
FJ / ROAR #2-122945 / Shop@ Awesomatix USA / Wild Turbo Fan / Mon-Tech Racing / RocheRC USA / Side Piece /
LRP / John's BSR Tires / TeamEAM / TQ Wire / R1 / Team Scream / PCR / MIX
RacerLog wiki Awesomatix A700 / 2wd offroad 4 life
hanulec is offline   Reply With Quote
Old 05-30-2008, 08:08 AM   #28788
Tech Elite
 
theisgroup's Avatar
 
Join Date: Apr 2002
Posts: 3,191
Trader Rating: 10 (100%+)
Default

playing with bodies next week, but I think 12 for me at vegas as well.

so far an 80-81mm roll out is where my 17.5 novak likes. the lrp seams to be 79-80mm
__________________
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 05-30-2008, 09:05 AM   #28789
Tech Regular
 
danthrc's Avatar
 
Join Date: Jan 2007
Location: Katy Texas
Posts: 468
Trader Rating: 2 (100%+)
Default

Pardon me for being dumb about this but I dont exactly understand the "roll out" terms. I know its a combination of Tire diameter, spur, and pinion calculations.
Can it be simplified to just get a gear ratio?

I'm new to 1/12 and will be running the 17.5. My spur is 100, and I think the only pinion that I have at the moment is a 34. We run on asphault and run the tires un cut for wear longevity. I'm not running the pro cut wheels yet. So I have alot of foam out of the box which is a larger tire diameter.

I think my gear only drive is around 2.94. How critical are the "roll out" numbers?
danthrc is offline   Reply With Quote
Old 05-30-2008, 09:27 AM   #28790
Tech Elite
 
theisgroup's Avatar
 
Join Date: Apr 2002
Posts: 3,191
Trader Rating: 10 (100%+)
Default

Quote:
Originally Posted by danthrc View Post
Pardon me for being dumb about this but I dont exactly understand the "roll out" terms. I know its a combination of Tire diameter, spur, and pinion calculations.
Can it be simplified to just get a gear ratio?

I'm new to 1/12 and will be running the 17.5. My spur is 100, and I think the only pinion that I have at the moment is a 34. We run on asphault and run the tires un cut for wear longevity. I'm not running the pro cut wheels yet. So I have alot of foam out of the box which is a larger tire diameter.

I think my gear only drive is around 2.94. How critical are the "roll out" numbers?
roll out is basically how far the car rolls with one turn of the motor. You can not just use gear ratio because the tire size changes over the life of the tire. our of the box, the tires are 50mm diameter, by the time they start working ok is 46mm and by the time they actually give you the best conditions, they are 43-44mm. as you can see the change in tire diameter also changes how far the car rolls with one revolution of the motor. just counting linear distance, one revolution of the tire for 50mm is 314mm and one revolution of 43mm tire is 270mm. here is a simple spread sheet you can use to calculate roll out. You would put in 1 as the internal gear ratio.


with what you have you will never get that 17.5 up to the right setup. running that low of a ratio could potentially hurt the motor. undergear is just as bad as overgear.
Attached Files
File Type: zip rollout.zip (3.0 KB, 62 views)
__________________
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 05-30-2008, 11:29 AM   #28791
Tech Champion
 
hanulec's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2007
Location: @ the post office
Posts: 8,015
Trader Rating: 23 (100%+)
Default

Quote:
Originally Posted by theisgroup View Post
playing with bodies next week, but I think 12 for me at vegas as well.

so far an 80-81mm roll out is where my 17.5 novak likes. the lrp seams to be 79-80mm
80-81mm -- interesting. I've been running as high as 88mm on both a novak and hacker 17.5. how big or how tight is the track you race on currently?
__________________
FJ / ROAR #2-122945 / Shop@ Awesomatix USA / Wild Turbo Fan / Mon-Tech Racing / RocheRC USA / Side Piece /
LRP / John's BSR Tires / TeamEAM / TQ Wire / R1 / Team Scream / PCR / MIX
RacerLog wiki Awesomatix A700 / 2wd offroad 4 life
hanulec is offline   Reply With Quote
Old 05-30-2008, 11:39 AM   #28792
Tech Elite
 
theisgroup's Avatar
 
Join Date: Apr 2002
Posts: 3,191
Trader Rating: 10 (100%+)
Default

Quote:
Originally Posted by hanulec View Post
80-81mm -- interesting. I've been running as high as 88mm on both a novak and hacker 17.5. how big or how tight is the track you race on currently?
way too high for us. this is carpet. www.mikeshobbyshop.com and go to the new track cam. it is 3 pieces of ozite with i think 100' back straight. I have run up to 85mm, but the car was not quick enough out of the corners. I found that with the novak on our track 80-81mm was the fastest. also I am running tires in the 44mm range. I think if I go down to a 42mm rear tire, that I should be able to run a 84mm or so. the taller tire take more for the motor to turn the extra meat.
__________________
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 05-30-2008, 01:55 PM   #28793
Tech Master
 
fpart's Avatar
 
Join Date: Apr 2003
Location: NJ
Posts: 1,902
Trader Rating: 38 (100%+)
Send a message via Skype™ to fpart
Default

Anyone have any feedback on the Associated 12R5?
__________________
teamYokomo.com teamTrinity.com Sweepracingusa.com
スクービーは私のヒーローです!
Why is Scooby so slow, you might ask?
fpart is offline   Reply With Quote
Old 05-30-2008, 05:36 PM   #28794
Tech Regular
 
danthrc's Avatar
 
Join Date: Jan 2007
Location: Katy Texas
Posts: 468
Trader Rating: 2 (100%+)
Default

Thank you or the chart. I will pick up some pinions at the track tomorrow and get a better set up.

We run on Asphalt with about a 60' straight
danthrc is offline   Reply With Quote
Old 05-30-2008, 05:54 PM   #28795
Tech Elite
 
theisgroup's Avatar
 
Join Date: Apr 2002
Posts: 3,191
Trader Rating: 10 (100%+)
Default

I believe that p2, carlosG, and picco run on an asphault track about the same size. and if I remember, they say 78-80mm

Quote:
Originally Posted by danthrc View Post
Thank you or the chart. I will pick up some pinions at the track tomorrow and get a better set up.

We run on Asphalt with about a 60' straight
__________________
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 05-30-2008, 06:24 PM   #28796
P2
Tech Fanatic
 
P2's Avatar
 
Join Date: Aug 2003
Location: Oahu, Hi
Posts: 865
Trader Rating: 15 (100%+)
Default

Quote:
Originally Posted by theisgroup View Post
I believe that p2, carlosG, and picco run on an asphault track about the same size. and if I remember, they say 78-80mm
On our track w/Novak 17.5 we are rolling out at 81mm. This is for a med-large asphault, lap times are around 14 seconds. I tried 85mm and the car would bog down out of the corners and the motor would ge very hot
81mm seems like a good start.
__________________
TopRacingUSA | Team EPIC | Thunder Power | OD Racing
P2 is offline   Reply With Quote
Old 05-30-2008, 07:38 PM   #28797
Tech Champion
 
hanulec's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2007
Location: @ the post office
Posts: 8,015
Trader Rating: 23 (100%+)
Default

im surprised to hear about the slightly lower roll outs. I felt like my car was never fast enough at that gearing, not just straight line but overall lap time.

what speedo are you guys running? im running the LRP 07 sphere. did you try changing the physical timing at all?
__________________
FJ / ROAR #2-122945 / Shop@ Awesomatix USA / Wild Turbo Fan / Mon-Tech Racing / RocheRC USA / Side Piece /
LRP / John's BSR Tires / TeamEAM / TQ Wire / R1 / Team Scream / PCR / MIX
RacerLog wiki Awesomatix A700 / 2wd offroad 4 life
hanulec is offline   Reply With Quote
Old 05-30-2008, 08:08 PM   #28798
Tech Elite
 
theisgroup's Avatar
 
Join Date: Apr 2002
Posts: 3,191
Trader Rating: 10 (100%+)
Default

Quote:
Originally Posted by hanulec View Post
im surprised to hear about the slightly lower roll outs. I felt like my car was never fast enough at that gearing, not just straight line but overall lap time.

what speedo are you guys running? im running the LRP 07 sphere. did you try changing the physical timing at all?
i am using the original sphere from 3 years ago and running the stock setup with a little less drag brake
__________________
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 05-30-2008, 09:09 PM   #28799
Tech Elite
 
andrewdoherty's Avatar
 
Join Date: Jan 2005
Location: ★Wylie, TX★
Posts: 3,763
Trader Rating: 47 (100%+)
Default

I'm running the same rollouts as theisgroup with a 4 cell GTB. The ESC is set to whatever the default settings are. We should have some good info about any differences there may be between the Novak, LRP, Hacker/Losi, and SP 17.5 motors after this weekend.
__________________
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
|◤Hobbywing◢|◤SpeedzoneUSA.com◢|◤Pro-One◢|
|◤ReflexRacing.net◢|◤Protoform◢|◤AVID R/C◢|
andrewdoherty is offline   Reply With Quote
Old 05-30-2008, 09:34 PM   #28800
Tech Adept
 
Join Date: May 2008
Posts: 110
Send a message via AIM to Creature
Default

Has anyone tried running a 1s4p pack yet?

I'm considering getting 4 Maxamps 3000 LiPo cells and building one, giving me a 12000 pack. See, I have a 4.5r motor that I can use, but its gonna be way too much and the loss of voltage should help (getting another motor is out of the question). My fear is that it will be too big.

Can mini cells (1000mah cells in 1s4p) provide me with the amps to push this 4.5 motor to speeds/rpm of a 10.5 on 4 cells?
Creature 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 04:55 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