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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 12-08-2005, 09:13 PM   #16141
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Amen my brotha from a different motha. I couldn't have said it any better.
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Old 12-08-2005, 09:25 PM   #16142
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Quote:
Originally Posted by bshields
The JRZ3650 is the digital version of this servo. Same size but it's faster and more torque.
i did not know that!!!! omg i thought they only have one (z3550) and i coulda get the digi one for a few more cents. i have a helios tX and the HSR feature is useless with 3550.
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Old 12-08-2005, 10:54 PM   #16143
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Quote:
Originally Posted by ApexSpeed
Hmmm, what does that have to do with the quality of the car? There are plenty of excellent designs out there in all facets of R/C and real racing that don't use full factory teams to spam their products on the podiums of major races. There are a couple of high-end touring car makers with a LOT of "team" drivers winning lots of really big races, but that doesn't make the cars better than any other company's. It just means there were more numbers stacked in the lottery.

Win on Sunday, sell on Monday, even if there's no chance that anyone buying on Monday will ever be able to win with that product.

{note: I am not degrading any brand of any car in any way, Slapmaster, SpeedMerchant or anything else. I just don't understand how Joe Pro's ability to win with hardware that was given to him, when he could win with ANY hardware he wanted to use, makes one product better than another.}
So…….. zero wins. I will spend my hard earned money in a known commodity. And it seems like a few guys on this thread promoting the slapmaster are a^$$^$s.

Last edited by gotyournumber; 12-09-2005 at 12:54 AM.
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Old 12-08-2005, 11:03 PM   #16144
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Holy cow.. he lives! Careful there Brian -- 3 more posts and you'll hit 40 posts on this board.

-Rich


Quote:
Originally Posted by bshields
The JRZ3650 is the digital version of this servo. Same size but it's faster and more torque.
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Old 12-08-2005, 11:12 PM   #16145
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Quote:
Originally Posted by gotyournumber
are a^$$^$s.
I guess it takes one to know one then, doesn't it? What an absolutely uncalled for bunch of crap. First Ike with his "until you break one" (show of hands who's actually SEEN one break..."what if" speculation doesn't count...and hit ANY of 'em hard enough and they'll break) and now you calling a small group of people names like you're in some junior high clique. Yeah, Number 11 made a pretty blanket statement that I'd bet Brian himself wouldn't have made, but it certainly wasn't with the intent of getting your panties in a bunch.

Brian seems like a decent guy and like a lot of the "fringe" manufacturers involved in this hobby he's not in it by any means to get rich. He's also been very honest if you read his thread about the struggles he's having coming to grips with set-up. It seems like some people throw it on the track and it works well while he's hunting around. Then again, he's pretty much a perfectionist--I'd probably be DELIGHTED with the set-ups he's questioning.

The point that was made about the best drivers being able to win with pretty much anything is SPOT on the mark. I'm quite certain Massami could wheel my 1989 RC12L past me with my "modern" wonder-car like I had square rear tire and a hung brush and I'm not TOO bad for a club racer. Kinda like Kimi Raikonnen could let me use his McLaren F-1 car and then lap me with my own Odyssey minivan.

Now my own choice for hardware isn't the MS either BUT I'm secure enough in my choice that I don't feel a need to tear it or any of the other cars down. The simple fact is you'd have to look MIGHTY hard to find a bad car in the lot and a decent driver can win with any of them. If it's not your cup-o-noodles that's cool too...

Now if I could just master that "decent driver" part.

Scottrik
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Old 12-08-2005, 11:14 PM   #16146
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Hey od,

Got the Rev 4 running. Will probably start using it this Saturday.

Yeeeeeeeee Haaaaaaaaaaa!
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Old 12-09-2005, 12:27 AM   #16147
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Boy I guess you told me. Well you asked the question. I have seen one break and the guy was a very good driver. Look I just asked a simple question a few threads back, you did you read it?

Last edited by gotyournumber; 12-09-2005 at 01:08 AM.
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Old 12-09-2005, 01:18 AM   #16148
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Hello!

I have a Matrix ESC with a brushless motor in my 1/12.

my question is:

Can I use the minipack of bateries in the reciver for supply to servo with a brushless motor??

If this is possible, I have that disconnect the red wire from ESC to reciver?

Sorry for my English!!

Thanks
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Old 12-09-2005, 03:24 AM   #16149
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Quote:
Originally Posted by Scottrik
I guess it takes one to know one then, doesn't it? What an absolutely uncalled for bunch of crap. First Ike with his "until you break one" (show of hands who's actually SEEN one break..."what if" speculation doesn't count...and hit ANY of 'em hard enough and they'll break) and now you calling a small group of people names like you're in some junior high clique. Yeah, Number 11 made a pretty blanket statement that I'd bet Brian himself wouldn't have made, but it certainly wasn't with the intent of getting your panties in a bunch.

Brian seems like a decent guy and like a lot of the "fringe" manufacturers involved in this hobby he's not in it by any means to get rich. He's also been very honest if you read his thread about the struggles he's having coming to grips with set-up. It seems like some people throw it on the track and it works well while he's hunting around. Then again, he's pretty much a perfectionist--I'd probably be DELIGHTED with the set-ups he's questioning.

The point that was made about the best drivers being able to win with pretty much anything is SPOT on the mark. I'm quite certain Massami could wheel my 1989 RC12L past me with my "modern" wonder-car like I had square rear tire and a hung brush and I'm not TOO bad for a club racer. Kinda like Kimi Raikonnen could let me use his McLaren F-1 car and then lap me with my own Odyssey minivan.

Now my own choice for hardware isn't the MS either BUT I'm secure enough in my choice that I don't feel a need to tear it or any of the other cars down. The simple fact is you'd have to look MIGHTY hard to find a bad car in the lot and a decent driver can win with any of them. If it's not your cup-o-noodles that's cool too...

Now if I could just master that "decent driver" part.

Scottrik
Look, the Slapmaster is a very cool yet expensive car, and I'll leave it at that simply out of respect for a friend. I think there are probably no less than 5 1/12th scale cars that are capable of winning any big race. I have no loyalty to any of them and would love to own each and every current car on the market to have fun with them and try them out. The main reason why I made my comment is because Number 11s comment was just silly and wreaked of fanboism.
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Old 12-09-2005, 09:15 AM   #16150
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Guys let's put a stop to this my intention wasn't to be malicious I didn't even really say anything except buy this conversion. This is wierd and getting out of hand. Anyway let's talk about 12th scale stuff and stop the bashing.
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Old 12-09-2005, 10:58 AM   #16151
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Quote:
Originally Posted by Number 11
Guys let's put a stop to this my intention wasn't to be malicious I didn't even really say anything except buy this conversion. This is wierd and getting out of hand. Anyway let's talk about 12th scale stuff and stop the bashing.
I don't think there has been much bashing through this whole thing. Compared to most of the flame wars you find here this one has not risen above room temperature. A couple of us made a comment about HOW you posted advocating for the slapmaster car which I think is a very good car, I have one it's on my shelf right now, I may wheel it out for mod before the carpet season is over. Not everyone agrees with you and have other opinions and therefore pointed out that it would be better clearly stated as such - an opinion rather than as a fact.

The reason that this has dragged on is because there has been no closure to the debate, until that happens either it will continue or just die slowly with some sour grapes. We may be at the point where we all have to agree to disagree, this is not usually an easy thing for posters to accept here.

On the subject of 12th scale posting. Cypress, a few of us on Wednesday evening ran a setup with the tweak screws backed off on our Rev 4's in stock. I like this a lot it felt like the car was a lot less nervous and the rear of the car was felt more bolted down. I compensated but running max caster (new style front end) and more traction compound on the front. Car was great, a lap improvement for the race and .4 sec improvement for a lap. This wasn't all down to the side springs though, I worked on the front end of the car which helped a lot. Have you tried this yet with any success?

Chris
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Old 12-09-2005, 11:08 AM   #16152
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Quote:
Originally Posted by Number 11
drsfly this is a great carpet chassis you should look at http://www.rctech.net/forum/showthre...56#post1987256
Maybe my wording was incorrect what I mean't was see above. My enthusiasm for the car got the better of me.
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Old 12-09-2005, 11:13 AM   #16153
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Quote:
Originally Posted by Number 11
Maybe my wording was incorrect what I mean't was see above. My enthusiasm for the car got the better of me.

Thankyou, and I agree I think it is a good car, I was running it on asphalt for a while in the summer too it was very good. I would like to run it again this year but I'm gearing up for the Nationals and I will be running a rev 4 in Stock I don't think I'll have the time.

Chris
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Old 12-09-2005, 11:19 AM   #16154
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Quote:
Originally Posted by EricF
CypressMidWest... do you know who distributes SM kits, horizon?

E

Oops...Thanks, I ment Speedmerchant not Slapmaster...
It's dealer direct, Bruce can set you up if you're trying to stock a shop, or if it's individual stuff you can also order directly through him.
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Old 12-09-2005, 11:24 AM   #16155
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My apologizes to everyone I hope you can forgive me my intentions where good I think my excitement got the better of me. My post was after another good night of racing. At last I have found a car that is consistent. My previous car I struggled one race it would be good the next it would be what the heck is going on. Anyway it has been nice to work with Brian because he has been so helpful.
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