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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 01-29-2012, 10:29 PM   #37606
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Hey guys... I have a 10yr old Hudy truer that I used to use for gas on-road foams. Mostly 50+ mms or larger.

I cant seem to find the Hudy #102064 adapter that allows for truing tires down to 40mm. Ive rigged something up that works, but it requires a bit more effort than an automatic truer should.

Ive had one on order for 2 weeks from a hobbyshop right down the street from RCAmerica... but it hasnt shown up yet. I cant find the part anywhere online. Does anyone know where to find this part? Or have one lying around they would be willing to sell?
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Old 01-29-2012, 10:48 PM   #37607
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Originally Posted by JamesL_71 View Post
Hey guys... I have a 10yr old Hudy truer that I used to use for gas on-road foams. Mostly 50+ mms or larger.

I cant seem to find the Hudy #102064 adapter that allows for truing tires down to 40mm. Ive rigged something up that works, but it requires a bit more effort than an automatic truer should.

Ive had one on order for 2 weeks from a hobbyshop right down the street from RCAmerica... but it hasnt shown up yet. I cant find the part anywhere online. Does anyone know where to find this part? Or have one lying around they would be willing to sell?
It took about a month to get one a few years back from RC America.
Not sure why they don't keep those in stock ?

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Old 01-30-2012, 03:17 AM   #37608
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Guy's

I'm looking for a black front end brace like CRC orso?
Anyone have any ideas for a black one?



Thanks in advance

Regards Robert
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Old 01-30-2012, 03:40 AM   #37609
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Originally Posted by Robert_K View Post
Guy's

I'm looking for a black front end brace like CRC orso?
Anyone have any ideas for a black one?
CEFX has one I think.
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Old 01-30-2012, 04:54 AM   #37610
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CEFX has one I think.
I can't seem to find them in the SpeedShop? Any other idea's

Regards Robert
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Old 01-30-2012, 06:35 AM   #37611
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What would be the 1st adjustment and/or incremental after adjustments to
give my gen xl more steering late apex (just before you roll on the throttle) and turn exit (on power)?

Med/high grip carpet and I am happy with my tire combo for now.
Thanks
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Old 01-30-2012, 06:56 AM   #37612
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Originally Posted by j.d.roost View Post
What would be the 1st adjustment and/or incremental after adjustments to
give my gen xl more steering late apex (just before you roll on the throttle) and turn exit (on power)?

Med/high grip carpet and I am happy with my tire combo for now.
Thanks
There is a lot that change change that.

We need more info

Please post your setup with tires and all

Also how is your front Tire Wear? is it coning at all?

What motor, Timing?
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Old 01-30-2012, 07:44 AM   #37613
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Top of my head (not in front of car right now).

Gen xl
17.5 non boost.
black front 42.75mm jaco
pink rear 43mm jaco or rc4less
white side springs
crc heavy tube lube
3mm ride height
gold center spring (with 30wt in shock)
stock front springs (50? I think)
Caster ...full back (two shims behind upper arm holder) not sure on degree.
2 camber.
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Old 01-30-2012, 07:58 AM   #37614
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I would try for Less Caster also what reactive caster block are you using?
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Old 01-30-2012, 08:02 AM   #37615
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Quote:
Originally Posted by j.d.roost View Post
What would be the 1st adjustment and/or incremental after adjustments to
give my gen xl more steering late apex (just before you roll on the throttle) and turn exit (on power)?

Med/high grip carpet and I am happy with my tire combo for now.
Thanks

Quote:
Originally Posted by j.d.roost View Post
Top of my head (not in front of car right now).

Gen xl
17.5 non boost.
black front 42.75mm jaco
pink rear 43mm jaco or rc4less
white side springs
crc heavy tube lube
3mm ride height
gold center spring (with 30wt in shock)
stock front springs (50? I think)
Caster ...full back (two shims behind upper arm holder) not sure on degree.
2 camber.

My initial suggestion, based on your first post, would be to try a bit more caster. It should give your car more steering thru the middle to exit of the corner. However, you seem to be running the max caster possible....

I don't see where you are specifying your reactive caster, though?? That is a very important piece to this puzzle.

However... regardless of all of the above, I have to question your tire choice. Are Black front/Pink rears being used by the fast guys at your local track? It should take a pretty unique track/traction level for Black/Pink to be the optimal tire combo.

Personally, I could never get the natural rubbers to work on my 17.5 12th at my local track. They just stick too much... and it causes a very annoying push. The car grips so much thru the corners that it feels substantially more sluggish. And the lap times reflect it... Without changing anything other than front tire sauce, I ran .2-.3s a lap faster with Black/Yellow than Magenta/Pink (90% sauce on Black fronts, 50% sauce on Mag fronts). The car and/or my driving style just dont mesh with natural rubber rears on a car as slow as 17.5 blinky 12th.

Unless it is known to not work through controlled/iterative testing, the first thing I would do is try a set of Yellow rear tires. True up a fresh set of Black/Yellows @ 41mm/43mm (Jacos) and see how the car works for you.
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Old 01-30-2012, 08:16 AM   #37616
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Quote:
Originally Posted by RedBullFiXX View Post
It took about a month to get one a few years back from RC America.
Not sure why they don't keep those in stock ?

[IMG]http://www.hudy.net/xhudy/show.php?img_id=922&crt=ccc0aa1b81bf81e16c676ddb97 7c5881[IMG]
Thanks for the info. I guess I will continue waiting..

I see that the automatic truers actually come with the 40-80mm slide adapter nowadays, so that is probably why the pieces are hard to find. Everyone who has a Hudy truer already has the 40mm adapter.
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Old 01-30-2012, 08:16 AM   #37617
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I was running magenta/pink for most of the day.
The car had a ton of turn in and was occasionally hooking (but still had the same prob. with exit).
So I went to the black front... seemed to calm down the turn in a bit.
Alot of the guys are running pink/Mag or yellow/blk.

Diff. is clean and smooth.
Car tweaks level on a board and with the coin trick.

I will check the blocks when I get home and post back.

Most of this (pan car) stuff is new to me so please excuse any
newbie type questions.

Thanks guys.
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Last edited by j.d.roost; 01-30-2012 at 08:27 AM.
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Old 01-30-2012, 08:37 AM   #37618
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Quote:
Originally Posted by j.d.roost View Post
I was running magenta/pink for most of the day.
The car had a ton of turn in and was occasionally hooking (but still had the same prob. with exit).
So I went to the black front... seemed to calm down the turn in a bit.
Alot of the guys are running pink/Mag or yellow/blk.

Diff. is clean and smooth.
Car tweaks level on a board and with the coin trick.

I will check the blocks when I get home and post back.

Most of this (pan car) stuff is new to me so please excuse any
newbie type questions.

Thanks guys.
Find out what reactive caster blocks you are using.

Mag/pink is a pretty common combination for Superstock and Mod 12th. It can definitely be made to work in 17.5 as well, although it wouldnt be my first choice.

Here are my thoughts. You say the car was twitchy with too much initial steering/turn-in with the Mag fronts, correct? And now you are trying to rectify a mid-to-exit corner push with the Black fronts?

My guess is you are running the 10* reactive caster blocks. This is giving you a ton of turn-in steering, and subsequently making the car difficult to drive. Black to Pink is a pretty huge tire compound split, in regards to durometer.... that isn't even taking into consideration the rubber content/type. IMO, the Black fronts are a bandaid for a car that isn't handling like you want it to.

You should be able to get Mag/Pinks to work on your car pretty easily if that is what other people are running. Again, I would start with Black/Yellow... but if other guys are using Mag/Pink with success, go for it.

The change I believe you need to make, is going from the 10* reactive caster blocks to 5*. This will smooth out the intitial steering substantially... it will also result in a little bit more caster thru the middle of the corner, which will give you a bit more steering there. With the 5* blocks, you should be able to use Mag fronts without issue.

But first and foremost, you need to check to see what RC blocks you are actually using! This is just speculation at this point......
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Old 01-30-2012, 08:51 AM   #37619
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Quote:
Originally Posted by j.d.roost View Post
I was running magenta/pink for most of the day.
The car had a ton of turn in and was occasionally hooking (but still had the same prob. with exit).
So I went to the black front... seemed to calm down the turn in a bit.
Alot of the guys are running pink/Mag or yellow/blk.

Diff. is clean and smooth.
Car tweaks level on a board and with the coin trick.

I will check the blocks when I get home and post back.

Most of this (pan car) stuff is new to me so please excuse any
newbie type questions.

Thanks guys.
From this point, I would have tried a lilac, or purple front.
That is, if the car or setup, didn't have any other issues....
-Tires coming unglued
-saucing too long, wrong sauce
-Bind in pod

Any track I've been to, we run Black, Yellow for blinky.
Magenta X2, or Magenta, Pink will work, but too much corner scrub.
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Old 01-30-2012, 12:21 PM   #37620
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I currently have the 5 deg. blocks installed.
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