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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 04-11-2007, 10:25 PM   #24841
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Quote:
Originally Posted by Marcos.J
maybe Ill put together the gen and maybe someday Ill be as good as wally
The battle of the internet racers....
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Old 04-11-2007, 10:40 PM   #24842
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Quote:
Originally Posted by protc3
to be honest,its not a bad thing for the front end to be based off or have it be a slightly changed version of the AE front end.the AE front end design is hands down the best design for a 1/12th car or 1/10th pan car.for CRC to veer from that would have been trying to re invent the wheel.i think it was a good idea for them to base it off of the AE front end with there own spin on it.im not a big fan of the pivot ball setup but it seems to have the same basic geometry as the AE with some slight change ups.there may be some issues with it but in reality should be pretty close to the same feel from what i can see.i never tried it and dont plan to because of the pivot ball setup so i cant say for sure.i honestly would have liked a duplicate of the AE front end but just accurate.im not picky,i just want to throw it together and run. instead i need to blueprint it.
i drove AE for years and when they came out with the new front end it was great but
crc's new front end is much better in the way it works
and it stays together better
the AE front end you have to work on it alot more to keep it running good.
the ball on the crc's front end is one of the reasons it stays together so well.and the lower ball is clamped to keep play at bay

i think with the gen x you dont have to work on the car so much to get it to work well
so you can think about driving and having fun
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Old 04-11-2007, 10:41 PM   #24843
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Originally Posted by duckman996
The battle of the internet racers....
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Old 04-11-2007, 10:47 PM   #24844
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Quote:
Originally Posted by wallyedmonds
i drove AE for years and when they came out with the new front end it was great but
crc's new front end is much better in the way it works
and it stays together better
the AE front end you have to work on it alot more to keep it running good.
the ball on the crc's front end is one of the reasons it stays together so well.and the lower ball is clamped to keep play at bay

i think with the gen x you dont have to work on the car so much to get it to work well
so you can think about driving and having fun
Uh...I PERSONALLY marshalled six gen-x's off the track this past weekend at the PKC (one twice, four once) all with lower arms broken off. I have no idea how many others were damaged. This was in a field of 38 total stock entries and 20 mods. Also figure I didn't marshall for 10 of either as they were in MY heats.

Every single one of those repairs entailed more time than I have spent "maintaining" all three of my upgraded (via CRC, IRS, Niftech, Lunsford) Associated front ends this season. Though I finally DID break an IRS-modded Associated lower arm when we raced in Denver...my first failure since I can't remember when. And it ain't because I don't hit barriers.
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Old 04-11-2007, 10:57 PM   #24845
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Originally Posted by Scottrik
Uh...I PERSONALLY marshalled six gen-x's off the track this past weekend at the PKC (one twice, four once) all with lower arms broken off. I have no idea how many others were damaged. This was in a field of 38 total stock entries and 20 mods. Also figure I didn't marshall for 10 of either as they were in MY heats.
That begs the question - were the front-ends built as per the advice on these boards? Many of the racers at our track have converted to the Gen-X and have noticed improvements with their lap-times.... without a problem with breakage if they have countersunk the arms properly - and it's not cause we don't hit stuff.

The bottom-line is that the new design by CRC makes great sense in keeping the front-end play at bay without having to purchase new replacement parts every couple months of racing. Some will like the change - others are die-hard AE front-end fans - so-be-it. I personally noticed a huge improvement in my performance in 1/12 as soon as I started driving the GEN-X, but that is because link cars seems to work better for me then T-Plate cars do.

One question to ask is since Associated is no longer making 1/12 cars - from what I have been told... how long will parts supply be available on replacement AE front-ends? If this is indeed true, CRC has a HUGE leap on everyone else in designing their own front suspension. Pretty smart!
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Old 04-11-2007, 11:01 PM   #24846
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Quote:
Originally Posted by Scottrik
Uh...I PERSONALLY marshalled six gen-x's off the track this past weekend at the PKC (one twice, four once) all with lower arms broken off. I have no idea how many others were damaged. This was in a field of 38 total stock entries and 20 mods. Also figure I didn't marshall for 10 of either as they were in MY heats.

Every single one of those repairs entailed more time than I have spent "maintaining" all three of my upgraded (via CRC, IRS, Niftech, Lunsford) Associated front ends this season. Though I finally DID break an IRS-modded Associated lower arm when we raced in Denver...my first failure since I can't remember when. And it ain't because I don't hit barriers.
nobody at fastcats breaks arm's

and like i have stated on a post here iv hit a steal beam with the arm and it did not break
somthing weird must be going on
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Old 04-11-2007, 11:07 PM   #24847
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I agree totally. The new CRC front end had it's growing pains but in a short time has improved immensly. The performance and adjustability was always steller, now with some of the changes, the durability is very good as well. And the CRC guys are continually improving the design and materials.

The AE front end has been out something like 10 - 15 years. In just months, the CRC front end surpassed the AE unit. Week after week at our track, we have no or very few broken parts with the Gen X car.

The real problem is the front end is just different enough to cause racers to fear something new, if you take the time and use the front end, you then appreciate all it offers.
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Old 04-11-2007, 11:10 PM   #24848
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Originally Posted by duckman996
That begs the question - were the front-ends built as per the advice on these boards? Many of the racers at our track have converted to the Gen-X and have noticed improvements with their lap-times.... without a problem with breakage if they have countersunk the arms properly - and it's not cause we don't hit stuff.

The bottom-line is that the new design by CRC makes great sense in keeping the front-end play at bay without having to purchase new replacement parts every couple months of racing. Some will like the change - others are die-hard AE front-end fans - so-be-it. I personally noticed a huge improvement in my performance in 1/12 as soon as I started driving the GEN-X, but that is because link cars seems to work better for me then T-Plate cars do.

One question to ask is since Associated is no longer making 1/12 cars - from what I have been told... how long will parts supply be available on replacement AE front-ends? If this is indeed true, CRC has a HUGE leap on everyone else in designing their own front suspension. Pretty smart!
I have no idea if they were built to "advice" on these boards--I WILL assume they were built to the "advice" CRC published in the instructions. The only "broken" cars I marshalled were Gen-X's, and that fact alone tells me all I need to know. The odd failure here or there happens. That many failures is a problem no matter what anybody says or how they try to rationalize it.

And I'm a BIG CRC fan. I LOVE my 3.2R's.

As far as parts availability--I'm curious where you've heard Associated is no longer making 1/12 cars. I hadn't heard that anywhere (not to say I didn't miss the announcement). I know Associated has undergone a lot of changes recently, but they've done a better job of supporting "legacy" cars than all the other manufacturers (big and small) put together. I'm pretty sure I can STILL get many parts for my gold tub RC10... The only piece I'm aware of for which there isn't an aftermarket replacement is the lower arm. Other than that CRC themselves provide my upper arms and steering blocks, Lunsford provides most of the hardware and axles, and so on. Even if the supply dried up and blew away (a BIG assumption) there will be parts for years to come.

Time will tell. I REALLY wanted the Gen-X to work for me, but for now I'm selecting bits and pieces. And none of the front end parts are among those bits. Anyone with ANY engineering sense/mechanical sympathy will point directly at the grub screw against the kingpin threads and say "that isn't done". You can make all the half-assed "fixes" (the brass screws only cure the symptom...not the problem) you want, but the fact is the design was flawed right there from the outset.

I'll be interested to see what Jason/BMI comes up with as re a 1/12 front end.

Scottrik
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Old 04-11-2007, 11:14 PM   #24849
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Quote:
Originally Posted by wallyedmonds
nobody at fastcats breaks arm's

and like i have stated on a post here iv hit a steal beam with the arm and it did not break
somthing weird must be going on
Six. Personally. Picked up off the track. PLASTIC barriers.

Some of them took some big hits, I won't deny that...but no other cars suffered breakage. There were Flexi-Flyers, Slapmasters, RugRats, 3.2R's, Darksides, etc. I don't think the Gen-X drivers were worse than everybody else, in fact Mitch's Gen-X tq'd both classes.

I was skeptical myself regarding all the reported breakage, but having seen what I saw I'm left wondering. That's an ENORMOUS coincidence if there's not a fundamental weakness.
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Old 04-11-2007, 11:15 PM   #24850
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Quote:
Originally Posted by Scottrik
Anyone with ANY engineering sense/mechanical sympathy will point directly at the grub screw against the kingpin threads and say "that isn't done". You can make all the half-assed "fixes" (the brass screws only cure the symptom...not the problem) you want, but the fact is the design was flawed right there from the outset.

Scottrik
The grub screw works fine. In fact, you don't even really need the grub screw if you use CRC's springs.

Do you have an engineering degree?
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Old 04-11-2007, 11:20 PM   #24851
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Originally Posted by insideline
Do you have an engineering degree?
No--I'm more the "mechanical sympathy" sort. The engineer I showed it to laughed and shook his head.
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Old 04-11-2007, 11:30 PM   #24852
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No--I'm more the "mechanical sympathy" sort. The engineer I showed it to laughed and shook his head.
That engineer ever win any big national level 1/12th races?
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Old 04-11-2007, 11:32 PM   #24853
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Originally Posted by Scottrik
I have no idea if they were built to "advice" on these boards--I WILL assume they were built to the "advice" CRC published in the instructions. The only "broken" cars I marshalled were Gen-X's, and that fact alone tells me all I need to know. The odd failure here or there happens. That many failures is a problem no matter what anybody says or how they try to rationalize it.
... and as more GEN-X users became familular with the car more fixes were found to the arm breakage problem that many early buyers of the car noticed. A simple countersinking of four holes will pretty much eliminate the breakage problem with this car ... how many hours of filing, polishing and sanding needs to be put into a AE front-end for it to work properly?

Take it easy Scottrik - unless you are the master-designer behind the AE front-end, don't take support of the CRC design personally.

As mentioned in a post above, the AE front-end has been out for many years - and I am sure when it launched - it had it's hiccups as well.

As an "engineer" flaws can be drawn out of any production item if you look hard enough.

CRC has brought something new to the table that is working really well - except of-course at the race where you had to remove the 6-odd cars. But I am sure we have all had to remove T-Plate cars from the track as well due to broken parts too.

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Old 04-11-2007, 11:43 PM   #24854
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Originally Posted by duckman996
As an "engineer" flaws can be drawn out of any production item if you look hard enough.
Yeah, but even a layman like me spotted that one.

I'm sure reliability will improve--though I'd have thought at least a FEW of the guys last weekend would be doing the "fixes". I don't know either way, so I can't make any representations.

Funny you mention T-bars--one of the cars was a T-bar car (not sure which one) fitted with the Gen-X front end. Managed to break both a lower arm AND the T-bar in the same wreck. THAT'S a wreck. Nicked the inside barrier which threw him hard to the outside barrier. Deflected off that into the path of a VERY fast car that then drilled it. Even managed to shut down the power.

My mod car had become undriveable in the B3. Looked at it this evening--the chassis was delaminated under the battery o-ring anchor clear back to the stand-off to the cross brace/tweak bridge. Ouch. I'd been meaning to install that ABP chassis... just hadn't planned to ruin the original chassis
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Old 04-12-2007, 12:38 AM   #24855
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Sounds like the track is extremly brutal on cars...

Have not seen any breakage on Gen X's at our local track. In fact dont see too much breakage at all. Just an occasional motor moving to far away from the spur and brushless shutdown.
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