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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:

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Old 07-18-2003, 09:33 AM   #3451
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Default Mike D

Thanks for the reply!!! Now I know what to say or answer the guys, actually I feel the same way about runningthe servo flat, will just save some more money to buy smaller servo's seeing your car, makes me want to rebuild my 1/12 as neat as yours!!!!
More Power and Peace!!!!
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Old 07-18-2003, 09:38 AM   #3452
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Default Re: Kit Confusion???

Quote:
Originally posted by DEACON
Although, I'm not particularly excited by the red color, the "Bloody Knife" seems to be the better value. When I factor in the price of a set of tires $20/pair (purple/grays) it probably makes more sense to get this kit.

Question:

- does the bloody knife come with threaded front axles?

- can the old style front end be fitted to the bloody knife chassis without any modifications?
- Yes the BK does come with threaded front axles.
- Yes the old skool front end is a direct fit. It's the one that I'm currently using. According to Davidl it has 1 degree of castor and -2 degrees of camber (which explains why my front tires are coning- too much camber).

Eric
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Old 07-18-2003, 10:38 AM   #3453
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Talking Mod motor update

Stormperson: I practiced with my 1/12 car thursday and started looking my car over. I swapped out the cyclone speedcontrol and put in an LRP comp. Man, what a difference. I think the cyclone was not giving me full throttle for some reason.....

With the 8x1 I was turning mid to high 10s'. I checked out some of the times the pro guys were running with their sedans and realized I was a half second faster!

I ran a pack with a pro friend of mine (no names please) and ran faster than him! Ya hooooooo...... Thanks for the input! I wouldn't have questioned that cyclone without your comments!
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Old 07-18-2003, 11:21 AM   #3454
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Hi Guys,

I'm needing more steering on power and any suggestion on setup would be appreciated

CRC 3.1
Tires - Greens on front and rear
Camber - 2deg
Caster - 4deg??(all spacers towards the rear)
Caster blocks - 0deg
Ride height - 4mm all around
Front spring - stock(.20??)
Side damper - 70wt shock oil
Side springs - Orange
Center shock - 50wt with .55 Super Stiff Silver(stiffest spring from CRC)
Traction compound - Paragon FXII full on both front and rears

With this setup , I have to let off the throttle early and maybe a quarter throttle upon hitting the apex , anymore the a quarter throttle on apex I would understeer badly , also if i were to enter a corner with some throttle input i would understeer even before reaching the apex

I was thinking of these changes:-
Higher center shock weight maybe 70wt
Softer front springs - which is softer??.18 or .20??

By the way I'm running on a medium-high traction aspalt track

I'm also considering a harder rear tires as that combination(soft front/hard rear tires) really work on the track with my F103(soft front/medium rear)

Thanks
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Old 07-18-2003, 01:12 PM   #3455
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Finsy:

You may want to go back to the stock set up and try (1) new tires- ususally for asphalt use purple fronts and pink rears. (2) full sause the rears and try a 1/4 on the fronts.

That's what I would try. If you get to far out and lost in you set up always go back to the stock set up and start over.

Eric
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Old 07-18-2003, 01:42 PM   #3456
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Default IRS Pics

Mike

Thanks so much for posting pics of your car. Your car looks great! Glad to see someone else still shares a love for the blue anodized parts still!!

Your car only confirms my desire to pick up this chassis set. I E-mailed Dave at IRS and unfortunately he is not aware of any distributors or retailers that have ordered the chassis set for resale. So, I will be purchasing direct from the IRS website. I just can't wait!! I haven't been racing all summer and I need a fix!! Putting a new car together will do it.

I notice the front end of your car looks a bit different than stock. It appears the upper arm mounts are spaced out further. Can you confirm if that is what has been done, how much you spaced them and what the advantages are.

I can't wait to burn up the local carpet track this coming fall/winter season. I have a points championship to defend this year and 1/12 scale in our area promises to be even bigger this year!!

I just may have to consider a trip to Cleveland this fall.

Thanks

Bob Zahn
Future IRS Rug Rat driver!
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Old 07-18-2003, 02:08 PM   #3457
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Default Re: IRS Pics

Quote:
Originally posted by Bobby Z
Mike

...

I notice the front end of your car looks a bit different than stock. It appears the upper arm mounts are spaced out further. Can you confirm if that is what has been done, how much you spaced them and what the advantages are.

...

Bob Zahn
Future IRS Rug Rat driver!
Bobby Z - The front end in the picture is the slightly modified. Each upper arm is about a 1/4" longer then stock. I use the reactive caster blocks, so I use an additional set of reactive caster blocks to make a spacer for each side. Dremel the top part away so only the screw holes and webbing between them is left. Use longer screws and assemble the front end with the spacer between the caster block and arm. I had to use a longer aftermarket camber turnbuckle because the stock one is too short to grab into the plastic pieces.

This modification will reduce chassis roll and steering. I usually run this setup on high bite carpet tracks. It helps smooth the car out when there us a surplus of steering. My car had a ton of steering at the nats so I put it on as a last minute change the morning of the mains and it helped.
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Old 07-18-2003, 02:12 PM   #3458
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Thanks for the additional info. Looks like I have a project to work on for tonight. Something to keep me busy until my chassis kit arrives. Thanks once again.

Bob Zahn

P.S. Once I get my kit together I will try to find you again on the forum to send me a carpet setup.
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Old 07-18-2003, 02:51 PM   #3459
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Hey guys! Scotty would like to hold the Oct. leg of the triple crown at Trackside. If any one knows who to contact , let Scotty know. Call him at Trackside- 262-783-4699.
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Old 07-18-2003, 03:49 PM   #3460
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Finsy,

I second the tire thing. In off road, tires are the # 1 thing you can do for handling. I'm sure you would do better with purple fronts. I doubt you will need full sauce with the new tires. My CK is hooked on blacktop with purple/pink. I am getting the same for my 1/10 pan, greens are just not cutting it. Some will not agree with me, but at least try it.

Bobby Z,

I raced against you last year (well, I was in the lowest main). 1/12 was a ball, looking forward to it this year. The only problem is I get home at 1:30 or 2:00 Am on a work nite. I can't go as often as I would like. It is a professional run race.

David Root
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Old 07-18-2003, 04:40 PM   #3461
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Quote:
Originally posted by Bobby Z
Thanks for the additional info. Looks like I have a project to work on for tonight. Something to keep me busy until my chassis kit arrives. Thanks once again.

Bob Zahn

P.S. Once I get my kit together I will try to find you again on the forum to send me a carpet setup.
No problem. The IRS 12th scale car is very new, so there are not many people running it (yet ). I always find it helpful to hear other pepole's opinions and to see other people's setups. I only started running the car just after cleveland last year. I only ran the car on carpet for a few months at the end of the indoor season but was very impressed with its performance.
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Old 07-19-2003, 06:29 AM   #3462
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I have noticed Front Lower arm of RC12L3 being different by right and left.
All my Lower Arm differed in height by right and left



Height on either side differs like this photograph. It seems to the difference that there is about 1.0-1.5mm

Furthermore, whenever it measured the height of Front Shaft in this way, right-hand side height was high.




In order to correct this, I needed to put the spacer into the bottom of ST knuckle in this way.




I want to know the state of your RC 12L3. Please investigate your RC12L3. And please tell me the result.


Thank you.
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Old 07-19-2003, 06:43 AM   #3463
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Quote:
Originally posted by Fike
Finsy:

You may want to go back to the stock set up and try (1) new tires- ususally for asphalt use purple fronts and pink rears. (2) full sause the rears and try a 1/4 on the fronts.

That's what I would try. If you get to far out and lost in you set up always go back to the stock set up and start over.

Eric
Quote:
Originally posted by David Root
Finsy,

I second the tire thing. In off road, tires are the # 1 thing you can do for handling. I'm sure you would do better with purple fronts. I doubt you will need full sauce with the new tires. My CK is hooked on blacktop with purple/pink. I am getting the same for my 1/10 pan, greens are just not cutting it. Some will not agree with me, but at least try it.

Bobby Z,

I raced against you last year (well, I was in the lowest main). 1/12 was a ball, looking forward to it this year. The only problem is I get home at 1:30 or 2:00 Am on a work nite. I can't go as often as I would like. It is a professional run race.

David Root
Fike , David - the reason why i'm reluctant to change the tires first is because currently i need more traction on the front so by using purple front/pink rear , i assume i would still be understeering as my front tires are harder than rear thus resulting in more traction in the rear than green/green and that's the reason i'm saucing full front.

Maybe i'll try with saucing just 3/4 rears.

I started from standard(the car doesnt turn at all on my track with this setup) setup with the green/green tires and thats the setup i feel is the best after running it for about 2 mths.

I'm contemplating of using Pink front/purple rear as my F103 seems to work on soft front/medium rear foams(This seems to be going against the normal F103 setup where most ppl are using medium front/soft rears apart from ppl on my track where they are using either soft front and rear /or softer front medium rears).

But then again currently my LHS has no such combination tires and i might need to do some online ordering.For front tires they have purple/magenta and for rear they have pink and grey.So that's the only combo i could find around here apart from green foams.

As i would not want to waste my hardearned money on some tires that might not even work.I prefer to do some setup changes first rather than spending something that isnt really raced locally.

I have all the side/center/front spring that i could work on so i hope i could get some setup tips that i could try first before purchasing any new tires.


Currently what im looking for is to reduce as much traction as possible on the rears so that the car could rotate more freely

Anymore input is greatly appreciated
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Old 07-19-2003, 08:26 AM   #3464
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Default My Last $.02

Finsey,

Borrow a set of purples, try them I don't think you will believe the traction.

I would also try 25 or 30 in the center shock and see if it reacts faster for you. It might let it get more traction by not being so sluggish as the heavy oil you are runing now. The heavy oil slows down the reaction of the front to bumps and could take away steering. It takes away the effect of the super stiff spring.

Softer springs on the king pins could help too.

One drop of Mobil 1 oil on each king pin where it slides up and down. make sure there is no binding in the front end at all. I take my springs off and make sure it moves freely through the whole travel.


There ya go, four cheap methods to fix your problem. Hope one works. Please let us know.

I run purple/Pink on the CK with a red or copper spring and it is hooked on blacktop waaaay better than my 1/10 with greens all the way around. I am ordering Purple/ PINk for the 1/10 too.

RC4less.com or CRC have good tires and great service.

David Root

Racing 1/10 pan again tomorrow, can't wait till 1/12 season on carpet.
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Old 07-19-2003, 08:31 AM   #3465
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Thumbs up Kiyano, good Post

I am going to check mine.
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