My ADVAN A005 slick wear,open discussion
 

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Is off season now for my endurance FD3D
Studying my tire wear today
Front camber -3.5
Rear -2.5
Front 28kg spring rear 22kg

From study it I think I can use a bit more camber and rear spring~

Do you have tire temp or thread depth information?

Also I would be curious as to your thoughts on these tires vs other non-dot slicks if you have any experience.

My other race car use hoosier slick, but is not fair to compare since my other one is live axle

i might try other brand slick in next season

I run 2.5 to 3 in front. Any more I get bad tire temps. In the rear 2.5 is about right. I run 1300 front with a big sway bar, and 1400 rear with no bar or a tiny bar.

The rule limit for 3 peace sway bar
What kind of slick u are running ?

Michelins seem to be the tyre of choice locally. Long time since Yokohama slicks were available here - too slow and uncompetitive, stock wasn't moving, so they stopped importing them....maybe things have improved since.

Surprised you can get 3.5 without lowering the car too far, that's assuming subframe hasn't been modified (or running eccentric bushes).

Ive run Michelin, yoko, hoosier slicks and a7's. The a7's were the fastest.

I placed an eccentric bushing in the upper control arm

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My rule limit me using aftermarket bushing
So I have to max out every thing
Here are my alignment spec
But my car is pretty low to the ground

I.was sunrise A7 get fastest lap time
May I know what size

Corner weighting without the driver seems a bit odd, camber and castor are starting figures or where they ended up?

Last Hoosier tried locally was a cross-ply slick ages ago - not on a FD, well off the pace compared to equivalent radial. In Dot type tyres, local fastest seems to be Hankook, followed by yoko 050, maybe dunlop DZ03 softs, but that's more of a reflection on treaded tyre rules here I'd expect, where grooved or dots in "street" versions are generally not accepted.

If they're 3hr races I'd probably not be looking at a Dot tyre. In a race a couple years back, did get to 8 or 9hr mark on 1 set of Pirellis before the oil pump shat itself, car was about 100kg less than a FD.....low abrasion surface, track temps got up to 50C or so.

Interesting, Race or Time Trial?

yes I raced the a7 's on a roadcourse for a 30 minute race and they did not go off . And I was running 700 hp through them on a warm day. They offer an even bigger advantage on cold days and are obviously a huge advantage on a time attack /slolam event. They also heat cycle well but the rubber is gone after 3 30 minute races .The slicks had more rubber left but were slower after the first heat cycle and exponentially slower after each cycle. I run 315 and 335. 18's.
I managed to get 54% rear weight by moving the 3 rotor back about 7 inches.

What % rubber would you say was left? I am trying to gauge the amount of rubber left relative to the heat cycle deterioration.

Also, what spring rate increase would one recommend with transitioning from Street DOT to R-comp to Full slick? Assuming aero is constant. Apologies for the tread jack.

Armen

My ADVAN A005 slick wear,open discussion
 

Nice know information
Next year I am runing by 18x11 wheel
So I think I will use 315 A7 too as my qualifying

For A005 it seen to last very well on my close to stock set up
I can use up to 100 lap and lap time different will be only 1 sec

Nice weight bias set up of ur 20B , that is perfect high hp with most of weight on the back
But I think when I feel my tank up (100L)
I will have about 52% of weight bias

Did any one shave their tire after race ?
I shave mine , and I could told u it work
Although is pretty time cousming
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just past the wearbars on the inside, barely visible wearbar outside.

run around a 1300 lb spring with slicks or a7. DOT (not super sticky) spring rates should be around 800 with little aero.

I run a big wing and at 140 mph the 1200 lb rear sping compressed about 2 inches and the tires were rubbing the inner wheel well. Hence the 1400 spring I run now.

Thanks. 1400lbs is a hell of a lot of spring and to consider 2inches of compression even with say 1000lb spring means your making some serious downforce (theoretically ~2000lbs of downforce given a spring rate of 1000lbs/inch and 2inch compression?) Im not assuming combined spring rates.

Im not sure about that. Remember there are two springs in the rear. And there is an angle of the spring, and a mechanical leverage in play through the length of the control arms. I have no idea of how much downforce is created but I doubt its 2000 pounds.

It was pretty amazing though. I had one ebay wing that collapsed in the centre and looked live a "V" at the end of a fast straightaway. The new wing held up and at the end of the straight the interior filled up with tire smoke from all the rubbing. Building your own racecar can be an adventure!

50 to maybe 100 lbs.

I actually stayed the same in the rear and just stiffened the front spring, but I'm in an FC.

Some time depend on if u are runing bias slick or radial slick ~

Good to know, thanks!

Just to let you guys know some more information on converting from Good R-Compounds to race slicks. We converted my RX7 from Toyo RR's (generally considered a very good R Compound street style tire) to a new slick out of Argentina from NA Carrera. The NA Carrera's are a Bias Ply style of tire, but unlike almost every other bias play slick manufacturer, they have kept improving the compounds to meet modern competition. All we did was pull the camber back to 0 degrees, the toe to zero degrees and started the race.

The tires were substantially quicker, I would say at least 1.5 to 2 seconds a lap at Mosport, more responsive and lasted like iron. The car was able to lead overall at times in the first hour of the 3 hour race and set fastest race lap for about the firs 75 minutes. Biggest difference was the predictability of the steering response and the faster lap times. Also, my front end has been slightly oversprung for a couple of years due to bar type and spring rate, but with the slicks, it was perfect.

On my Cougar, the tires really impacted the spring rates and I have to boost the rates up at least 50 lbs and more likely 100 lbs a corner.

Here are pictures of the tires after running 3 hours. The first is the heaviest loaded front corner on the Cougar and the second is the same corner on the RX7. The third picture is drivers side rear on the Cougar.As an FYI, I can cord a set of Toyo 888's in 90 minutes if I am not careful in the Cougar. And the RX7 finished first in class and the Cougar 3rd.

Eric