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Old 09-27-2007, 06:25 AM   #1
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Default Concrete race

Could anyone have race EPTC on concrete surface before?
Would you mind to sharing me what kind of tyre compound with insert and other kinds of setup tips have used for race, please?
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Old 09-27-2007, 09:32 AM   #2
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Local parking lot races have been held on two locations with concrete surface. One was fairly smooth and the other is more of a broomed texture and is abrasive. Interestingly enough, trusty old Takeoff CS-27's work well on both (standard pre-mounts with medium inserts).. On the abrasive track Sorex 28R and 32R's also work (32R's are nice because they stand up to the surface and don't wear as much)...

All of this is in Midwestern USA heat, but concrete is not as affected by the sun and heat -- on a 100 degree day, the concrete only gets to 120-130 degrees, where asphalt can fry eggs...!

Tire "sauces" aren't used much here, as for these parking lot races, the surface is a bit dusty, and too much "sticky" on the tires makes them pick up crud and really hurts performance -- Simple Green or Orange Clean is used to clean the tires, but that's about it.

One key wildcard in all of this is the texture of the concrete -- surfaces can vary widely (from a slick, almost polished finish to a coarse broomed surface that is like sandpaper). Adjust accordingly -- what will your surface be like?

Another wildcard comes from the joints between concrete sections. One local location was super smooth, with joints that were cut with a saw, so the transitions were smooth and almost invisible to the cars, allowing lower ride height and stiffer setups... The other location has some SIGNIFICANT "bumps" associated with these joints, since the joints were actual boundaries to multiple pours, creating wider gaps and some serious transitions -- cars have to be setup higher and softer for this location. (The track has to be laid our very carefully -- if it makes the cars hit some joints the "wrong-way", the cars get AIRBORNE!)...
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Old 09-27-2007, 10:28 AM   #3
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Quote:
Originally Posted by tfrahm View Post
Local parking lot races have been held on two locations with concrete surface. One was fairly smooth and the other is more of a broomed texture and is abrasive. Interestingly enough, trusty old Takeoff CS-27's work well on both (standard pre-mounts with medium inserts).. On the abrasive track Sorex 28R and 32R's also work (32R's are nice because they stand up to the surface and don't wear as much)...

All of this is in Midwestern USA heat, but concrete is not as affected by the sun and heat -- on a 100 degree day, the concrete only gets to 120-130 degrees, where asphalt can fry eggs...!

Tire "sauces" aren't used much here, as for these parking lot races, the surface is a bit dusty, and too much "sticky" on the tires makes them pick up crud and really hurts performance -- Simple Green or Orange Clean is used to clean the tires, but that's about it.

One key wildcard in all of this is the texture of the concrete -- surfaces can vary widely (from a slick, almost polished finish to a coarse broomed surface that is like sandpaper). Adjust accordingly -- what will your surface be like?

Another wildcard comes from the joints between concrete sections. One local location was super smooth, with joints that were cut with a saw, so the transitions were smooth and almost invisible to the cars, allowing lower ride height and stiffer setups... The other location has some SIGNIFICANT "bumps" associated with these joints, since the joints were actual boundaries to multiple pours, creating wider gaps and some serious transitions -- cars have to be setup higher and softer for this location. (The track has to be laid our very carefully -- if it makes the cars hit some joints the "wrong-way", the cars get AIRBORNE!)...
Oh, you mean doesn't need tyre warmer.
I think 32r should be better, beacuse there has a sand soccer pitch beside of track, so the less sticky will be choice
Thanks!
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Old 09-27-2007, 07:16 PM   #4
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Since you mentioned a soccer sand pitch next to the track...

Under dusty conditions, there can be some advantages to trying a bit of an unexpected tire setup... The HPI "X-pattern" tires (in the PRO compound) can work. They are a bit harder than 27's or 32's, so they normally would not be a good tire for racing, but since they have a semi-scale tread pattern (like a high performance radial), they can cope with dusy/sand better than a true SLICK tire...

Also -- you are right about tire warmers. The trick to dusty concrete racing surfaces is to get traction without picking up the dust/dirt on the tires. Tire warmers can make the tires too sticky (especially with the softer compounds like 27's). They might work with 32's...?
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Old 09-28-2007, 12:43 AM   #5
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I've been using the HPI ADVAN A038 BELTED TIRE 24mm (33R) for concrete race... at least here in our court, there is no way a sorex or a take-off will get traction... the concrete usually have a very fine dust layer... and we have tried several nitro foams and rubbers as well....
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Old 09-28-2007, 07:55 AM   #6
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Maybe an intermediate tyre would help channel the dust away and get the car to grip too, but i'd go with the suggestions and go for a 28 or 32 sorex and not sauce the tyres
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Old 09-28-2007, 09:12 AM   #7
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It depends how was the wind in race main moment.
But wait HPI Xpattern, 26mm ones? it's difficult to find insert to fit it.
And A038, this one it's also another innovation, i don't know which insert for these 2 tyres.
But the most troublesome kind was some of the 2008 events maybe will held on brick floor then it's not confirmed yet, also tips to share together?
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Old 09-28-2007, 09:40 AM   #8
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Quote:
Originally Posted by mac853 View Post
And A038, this one it's also another innovation, i don't know which insert for these 2 tyres.
atsushi hara ver.2 medium...
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Old 11-04-2007, 08:58 AM   #9
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Sorry, i was late to reply again.
Could try to put HPI advan A038 33r in front and Sorex 32r in rear due there are a lot of cars with full sorex 32r on oversteering in A main final. Or are compulsory to put full A038 to race?

Last edited by mac853; 11-04-2007 at 12:46 PM.
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Old 11-10-2007, 10:01 AM   #10
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Could somebody reply to me the question before.
And also tell me which 3 of them it's better to clean tires to concrete race: WD40, motor and tire cleaner?
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Old 11-10-2007, 07:50 PM   #11
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If you are running on polished concrete the Schumacher White compound slick rules. It gives enough traction to traction roll...which is funny because the tire is useless any other place...lol!
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