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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 03-19-2004, 04:58 AM   #7261
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Default bottom plate

Randy,

The part number for the new bottom plate is the same as the old one. This was just a production change, so the part number did not change at all. would reccommend ordering a couple of extras.

Robert
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Old 03-19-2004, 05:02 AM   #7262
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Default bottom plate

thank you robert s

i will call and add 2 of them to my back order list today
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Old 03-19-2004, 07:30 AM   #7263
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Quote:
Originally posted by elvo
davidl - stop it. Some newbie might actually believe what you wrote let me guess - engineer?
Gee, there had to be somebody jump up and spoil my fun.

Actually, I am retired. I had a 29 year career with the US Navy as a civilian engineer working wiring systems for military aircraft. As it turns out, the field thing I mentioned is actually true, but it doesn't put force on objects, it only interferes with low strength signals. We fought that a lot in aircraft wiring because the wires carrying power and signals were close together and the wires do act as antenna. Well, I digress. You should be asking me why or how and old shakey guy like me can run competetively with the young whipper snapers, esp Hartzell.
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Old 03-19-2004, 07:31 AM   #7264
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It's impressive I'll say that David. I've seen you run at Ultra once and you are smooth...
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Old 03-19-2004, 07:48 AM   #7265
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Default Rev3 to rev4

Hey 12th scalers.

Just a quick note to say that the conversion from a Rev3 to Rev4 is very straightforward. Here are some building tips.

1. Servo-you can mount it flat on the chassis-but will need to make a relief in the chassis to clear the Servo saver. Or you can mount it on block raised up a bit. if you choose to run re-active caster front end-you will have no issues there.

2. DO NOT BEVEL the battery slots. bruce made them perfect for GP3300 cells. Just lightly sand them smooth.

3. There is no three.

I was able to move evrything over and I only had to slightly adjust one side link. Even the pod was even side to side with one link on!!!

I'll post a pic later,
Ray
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Old 03-19-2004, 07:54 AM   #7266
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Default Re: speedo

Quote:
Originally posted by robert s
Tim,
Do not worry about borrowing my LRP for the summer. I am not planning on running much more the rest of the year. so if you want to keep it to run in 12th scale for the summer go right ahead and do so. We are a team, remember team T and R Racing.

See you tomorrow.

Robert
Thanks Robert. I am sending my twister with Adam to the nats. KO is gonna look at it for me to see what's up.

I set my pre-load so that my leading edge is slightly higher. like a "^" this way it flattens out under acceleration. Since my car is extremely overweight, 33 ounces, I set the thing up with 3.5mm ride height up front and 4mm in the back and actually I have only one degree of caster and my batteries are moved forwards in the chassis. The thing pushes otherwise. I use a .010" shim under the front t-plate screw and i use a irs SS t-plate. Trinity purple if the dampener tubes are below the plate, trinity red if they're above.

If you want psycho dampening for the rear pod on the reflex, put the tubes up top.

That's just me though.

sns820, I charge my batts at 6 amps. I have killer runtime cells though. Rcsilly's 5 amp charge is safer and you usually don't have any issues with dumping.

David, you're the man. I'm impressed at how good you do especially when I watch you up on the drivers stand. I've been racing 1/12th scale for 2 years now and I only aspire to catch up to you within the next 10 years.

Ray, that chassis looks killer. One of the locals here had one. It might make me buy a spring car again. Maybe.......

Tim
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Old 03-19-2004, 07:57 AM   #7267
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Ray - that's good to know as I will be upgrading one of my Rev3's to a Rev4. Anxious to see your pics.

Clint
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Old 03-19-2004, 08:11 AM   #7268
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Talking REV 3 to REV 4

I finally had some time to practice last night with my Rev 4.

Although I am still not a great (or good for that matter) driver, I was thrilled with my improved laps.

I was running with blue side springs, red center spring, double-pink fronts and pink rears on a green track. I was able to steer the car exactly how I wanted to through the whole turn.

Being not a great driver, it did take me a couple of packs to make sure to smooth out my line to not over-rotate in mid-corner now that I have the better traction there.

Not wanting to start trouble , I think the ability to have the narrow chassis (and thus not have the edges rub when running at a reasonable ride height) will be a big advantage over T-Bar designs.
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Old 03-19-2004, 08:17 AM   #7269
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Default Rev4 top view

Okay-heres a pic of the car I just built. Hasnt been on the track yet. Sunday!!

Ray
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Old 03-19-2004, 08:27 AM   #7270
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Hey Ray, where did you get the purple parts from? Just curious...

Clint
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Old 03-19-2004, 08:33 AM   #7271
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The rear axle is an IRS Big Ring and the Rear pods are IRS. Check them out here IRS Purple Stuff Eventually I will get purple Ti turnbuckles and make sure all nylocks, body clips and ballstuds are purple. Probably never happen!!

Ray
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Old 03-19-2004, 08:48 AM   #7272
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Cool.. thanks for the info..

Clint
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Old 03-19-2004, 09:15 AM   #7273
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yeah , Tim definatly has the " good cells" .
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Old 03-19-2004, 09:20 AM   #7274
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Quote:
Originally posted by davidl

Well, I digress. You should be asking me why or how and old shakey guy like me can run competetively with the young whipper snapers, esp Hartzell.
Thats why Masters is where the fast guys run .........

I can hear Adams head swelling up already
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Old 03-19-2004, 02:31 PM   #7275
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davidl--I'll see you on Wed. and we'll have to talk about you keeping up with me.
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