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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 09-30-2010, 12:53 PM   #34741
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Well it's built

just waiting for my lipos then i can set the servo up and then set the car up with my mate Pieter at the weekend

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Old 09-30-2010, 12:59 PM   #34742
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Quote:
Originally Posted by CypressMidWest View Post
That center pivot design is brilliant. I love the captured nuts that secure the block, and the pivotball cap to adjust the slop.
There are cool little details all over the car, like thumbwheels on the tweak screws and micro-adjustable body posts.

Quote:
Originally Posted by radio_car_racer View Post

Why no Li-Po specific chassis?
Some places still use round cells, you can put a lipo in a 4 cell car, but you can't put cells in a lipo chassis. Plus, guess what one of the first option parts will be

Quote:
Originally Posted by SpeedMerchant View Post
Got to see the car in Vegas. It's really nice. Great to see some innovation. Pretty sure Josh did the majority of the design...just a super job.

Another cool 12th scale for the racers to choose from.

Good luck OD and the TOP team.

Take care.-Bruce
Thanks Bruce,
As far as I can tell, this car is 100% of what is in Josh's CAD drawings of the Rebel. He was like a little kid at Christmas showing it around at the IIC, he should be very proud of this design
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Old 09-30-2010, 05:20 PM   #34743
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Originally Posted by odpurple View Post
Some places still use round cells, you can put a lipo in a 4 cell car, but you can't put cells in a lipo chassis. Plus, guess what one of the first option parts will be
In which case it really should be offered as another version rather than the chassis separate as an option. Right? If done as an option that would, to be honest, be a deal-breaker for me and I can't imagine I'd be terribly alone in that thinking.
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Old 09-30-2010, 05:24 PM   #34744
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Originally Posted by Scottrik View Post
In which case it really should be offered as another version rather than the chassis separate as an option. Right?
+1
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Old 09-30-2010, 05:48 PM   #34745
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Originally Posted by sidecarphil1 View Post
Well it's built

just waiting for my lipos then i can set the servo up and then set the car up with my mate Pieter at the weekend

very Nice I am picking up one this weekend can't wait.
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Old 09-30-2010, 06:08 PM   #34746
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I feel the Hot Bodies shock is the best shock out there for our cars. You build it just like a touring car shock. Simple. Done.
But I have several IRS shocks that I want to build up with differing shock oils. Does anyone have a foolproof way to build these little buggers? All the ones I've built up in the past, went to crap right away with air. And I have made sure to saturate and massage shock oil onto/into the foam piece. That's usually the culprit. Any other little tricks?
Thanks guys

- JB
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Old 09-30-2010, 06:22 PM   #34747
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I know everyone is running 16 guage wire from the ESC to the motor. Would I lose anything by running 18 guage? I will be running either 17.5 or 13.5.
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Old 09-30-2010, 06:25 PM   #34748
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Originally Posted by JayBee View Post
I feel the Hot Bodies shock is the best shock out there for our cars. You build it just like a touring car shock. Simple. Done.
But I have several IRS shocks that I want to build up with differing shock oils. Does anyone have a foolproof way to build these little buggers? All the ones I've built up in the past, went to crap right away with air. And I have made sure to saturate and massage shock oil onto/into the foam piece. That's usually the culprit. Any other little tricks?
Thanks guys

- JB
I noticed that with the ch12 shock it would be fine but after a lil while air in it. With crc's encore shock that would never happen to me.
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Old 09-30-2010, 06:25 PM   #34749
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Originally Posted by Scottrik View Post
In which case it really should be offered as another version rather than the chassis separate as an option. Right? If done as an option that would, to be honest, be a deal-breaker for me and I can't imagine I'd be terribly alone in that thinking.
to me it makes no difference, I don't see a need to buy an 'option' that doesn't actually upgrade anything. if it was a upgrade that actually made the car work better.....well then you might have a point
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Old 09-30-2010, 06:26 PM   #34750
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Quote:
Originally Posted by JayBee View Post
I feel the Hot Bodies shock is the best shock out there for our cars. You build it just like a touring car shock. Simple. Done.
But I have several IRS shocks that I want to build up with differing shock oils. Does anyone have a foolproof way to build these little buggers? All the ones I've built up in the past, went to crap right away with air. And I have made sure to saturate and massage shock oil onto/into the foam piece. That's usually the culprit. Any other little tricks?
Thanks guys

- JB
I rather like the Silva shock now that I figured out to change the bladder once in awhile. The new CRC shock is really trick too.
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Old 09-30-2010, 06:51 PM   #34751
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Originally Posted by Scottrik View Post
In which case it really should be offered as another version rather than the chassis separate as an option. Right? If done as an option that would, to be honest, be a deal-breaker for me and I can't imagine I'd be terribly alone in that thinking.
I don't know when any option chassis would be available from T.O.P. but I honestly don't see what the big deal is. The car was designed to accept both cells and lipo. Maybe I just don't see something, do some people not buy CRC cars because they accept cells?
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Old 09-30-2010, 07:00 PM   #34752
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Quote:
Originally Posted by JayBee View Post
I feel the Hot Bodies shock is the best shock out there for our cars. You build it just like a touring car shock. Simple. Done.
But I have several IRS shocks that I want to build up with differing shock oils. Does anyone have a foolproof way to build these little buggers? All the ones I've built up in the past, went to crap right away with air. And I have made sure to saturate and massage shock oil onto/into the foam piece. That's usually the culprit. Any other little tricks?
Thanks guys

- JB
Anyone?...Bueller? LOL
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Old 09-30-2010, 07:12 PM   #34753
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I'm pretty sure if you lick the foam... it works better.

Disclaimer: Never listen to my absurd joking with Jaybee.
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Old 09-30-2010, 07:17 PM   #34754
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Originally Posted by JayBee View Post
Anyone?...Bueller? LOL
I haven't built the IRS shocks, but back in the 90's racing oval pan, I built some mean shocks.

I'm going on the assumption that the shaft o-ring is bottom loaded with some form of cap, if that's not the case, you'll have to let me know.

I try to fill the shaft o-ring area with shock oil [shock shaft installed] before sealing it up with the cap, then fill and bleed as normal after that. I put the bladder in place before the cap, and try to tighten it just enough that the preload collar can be adjusted without unthreading the shock cap, but not as tight as I can get it. Seems to work pretty well for me to limit air getting in the shock.

Again, sorry if the IRS shock isn't bottom loaded with a cap and my personal regimen won't work for you.
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Old 09-30-2010, 07:20 PM   #34755
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it does have a bottom cap
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