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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 11-06-2006, 12:33 PM   #21751
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Quote:
Originally Posted by pheyhoe
Im loving the rear end with the new top plate design.

Also, the bulkhead that does not hold the motor. What is the small slot for? Sensor wire? and the the big one for the main wires?
The small slot is for the motor screw, since the part is the same on the left and right.
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Old 11-06-2006, 12:42 PM   #21752
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Quote:
Originally Posted by Scottrik
Or use the shorter #1260 1/2" standoff (as opposed to the 5/8" standoff as supplied in the kit) standoffs available from CRC.

http://www.teamcrc.com/crc/modules.p...od&prodID=1260

This should allow you to use the standard spring perch/screws you've got and, ostensibly, would marginally lower weight (smaller aluminum standoff) and cg (lowering the tweak bar/bridge).

Scottrik
Right, I see what your saying another way to bridge the gap. I suppose those stand-offs would look alot nicer too as long as they dont require any other mods or make the rear suspension act differently than what I'm currently use to.
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Old 11-06-2006, 12:51 PM   #21753
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Originally Posted by nf_ekt
Right, I see what your saying another way to bridge the gap. I suppose those stand-offs would look alot nicer too as long as they dont require any other mods or make the rear suspension act differently than what I'm currently use to.
Well...it shouldn't make the rear suspension work TOO differently. Some guys have been doing this with their 3.1's and 3.2's for a while. I still run with the balls under my tweak springs...dunno why, guess it works for me.

Only real "other mod" would be you'd need to raise the pin on your rear body mounts one hole (since they're dropping 1/8" also. If you've got 'em cut off at minimum length you might need to replace them. You'll also have SLIGHTLY more angle on your dampener tubes but I'd be hard pressed to say it would be noticeable. If it's a problem, 1/8" worth of washers to space the outer ball studs up and you're off to the races.

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Old 11-06-2006, 03:29 PM   #21754
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Default So I'm getting back into 1/12 scale racing and...

I'm wondering what car is the best for asphalt racing, I don't think my 12i is quite up to the task these days lol. Is the AE 12l4 as good as the CRC? And has anyone seen the new CRC X. Thanks in advance for any input. Funny when I first started racing in the 80's 1/12 was the only scale, strange how things come back around.

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Old 11-06-2006, 03:37 PM   #21755
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I just picked up the 3.2r and was wondering where everyone goes to get upgrades online. I'm trying to find someone that has a lowered rear bulkhead set. Any other mods or recomended upgrades???
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Old 11-06-2006, 03:42 PM   #21756
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Quote:
Originally Posted by chris moore
I'm wondering what car is the best for asphalt racing, I don't think my 12i is quite up to the task these days lol. Is the AE 12l4 as good as the CRC? And has anyone seen the new CRC X. Thanks in advance for any input. Funny when I first started racing in the 80's 1/12 was the only scale, strange how things come back around.

Chris

T plate cars seem to work better for me on asphalt
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Old 11-06-2006, 03:43 PM   #21757
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Quote:
Originally Posted by killingtime
I just picked up the 3.2r and was wondering where everyone goes to get upgrades online. I'm trying to find someone that has a lowered rear bulkhead set. Any other mods or recomended upgrades???
Your 3.2R already has lowered rear bulkheads.

CRC are a great source for mods/optional parts. Stormer and K-T are two shops that carry quite a bit of CRC parts but are pretty hit-or-miss as to what they've got at any given time.

Scottrik
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Old 11-06-2006, 03:48 PM   #21758
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Quote:
Originally Posted by killingtime
I just picked up the 3.2r and was wondering where everyone goes to get upgrades online. I'm trying to find someone that has a lowered rear bulkhead set. Any other mods or recomended upgrades???
Consider the CRC cars to already be fully hopped up.... There's nothing you need.....

Ok, maybe some titanium front axels...
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Old 11-06-2006, 03:54 PM   #21759
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Default 3.2r

You need these......http://www.kthobbies.com/shop/produc...fc2d915079cd29
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Old 11-06-2006, 04:04 PM   #21760
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Double Post--sorry
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Old 11-06-2006, 04:07 PM   #21761
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Quote:
Originally Posted by vtl1180ny
Consider the CRC cars to already be fully hopped up.... There's nothing you need.....

Ok, maybe some titanium front axels...
The 3.2R even comes with the Ti axles!!

Hmmm...just put the finishing touches on a new "loaded" 3.2R yesterday.

Have:

Lunsford Punisher Ti turnbuckles w/Dubro 4-40/2-56 ball links (no slop), Ti kingpins, Ti 6-32 X 1/2" screws to mount lower arms (no more phillips drive), Ti axles (come in the 3.2R kit) and Ti camber adjusters (via CRC).

CRC machined delrin upper arms and steering blocks, aluminum upper arm mounts in all three camber choices (0, 5 and 10 degree), aluminum servo mounts, and low roll-center kit

Slapmaster thrust bearing kit, carbon fibre roll-over mast, bumper

Murdock/Windtunnel Precision Parts ceramic bearings, diff balls and front springs

IRS "lowered" lower control arms and rear ride height adjusters

Fibre-Lyte front ride height adjusting shims

I'm sure I've forgotten some stuff. Building up another now that has the CRC ABP (adjustable battery position) chassis in addition to all the above parts. With this it gets DARN close doubling the price of the original 3.2R kit.

Then add my Niftech hollow axles...though they're on their second and third chassis now...

Scottrik
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Old 11-06-2006, 04:16 PM   #21762
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Default Gen X questions

In the CRC description on their site I see that the aluminum servo mount is included in the kit. Kudos.

From pics on their site it looks like:

New ball link-style tie rod ends...are these part of the kit?

Car in pics has low roll-center pieces, are these now included in the kit? (still optional in the 3.2R)

Front ride height--I see what look like red standoffs under the lower arm. Are we still using shims (CRC, Fibre-Lyte, etc) to fine-tune front ride height or?

What keeps the tweak/side-spring "bridge" (doesn't span much anymore...) from twisting/pivoting on the standoff? it looks like it's only really attached at the standoff (and, arguably, up through the body).

Looks like it uses the same rear axle assembly we've come to know and love?

Same side-springs? Looks like it.

Thanks,

Scottrik
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Old 11-06-2006, 04:23 PM   #21763
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Hi Scottrik

I have been running a prototype version of the new chassis. The tweak bridges (now two pieces rather than one) do not spin because they have two standoffs each (total of 4 stand offs).

The side springs are the same.

Cheers

Mark

Quote:
Originally Posted by Scottrik
What keeps the tweak/side-spring "bridge" (doesn't span much anymore...) from twisting/pivoting on the standoff? it looks like it's only really attached at the standoff (and, arguably, up through the body).

Same side-springs? Looks like it.

Thanks,

Scottrik
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Old 11-06-2006, 04:29 PM   #21764
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Default 1/12 scale

<<T plate cars seem to work better for me on asphalt>>

Which cars/platforms have the t-plate?

Chris
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Old 11-06-2006, 04:49 PM   #21765
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Quote:
Originally Posted by Mark Payne
Hi Scottrik

I have been running a prototype version of the new chassis. The tweak bridges (now two pieces rather than one) do not spin because they have two standoffs each (total of 4 stand offs).
OK--I see now. The "bridge" doesn't span across now, it runs 'round the corner and the battery anchor now becomes the second standoff on each side.

Still use shims under the front or...?

Low roll-center kit "standard" now or...?

Thanks again Mark!! When can we expect an updated builder-blog?

Scottrik
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