The Official 370Z Autocross Thread

[AutoX Z]

Originally Posted by OppositeLock

After skimming through the thread I saw a few other people talking about competing in SCCA C-Stock. Does C-stock really allow slicks? For some reason I thought it was DOT tire only, but looks like I'm mistaken. What are the other allowances I should be aware of besides front bar?

What slicks are you guys using, and is the consensus 285's on all 4 corners?

I've got 2 autox's under my belt on the stock RE050s, time to step up.

To clarify Hoosier A6s are not slicks, they are DOT race tires. Slicks are a completely different animal and are not allowed in stock or street prepared. If you are going to get some Hoosiers 295/30/19 is the size you want on all 4 corners. I would spend some more time on your stockers before making the jump to r-comps. If you think you're ready to drop 1300 on a set of tires that will last maybe 1/2 season and cannot be driven on the street then by all means.

Ps if you're wondering don't waste you're time with other r-comps like Toyo r888's and the like. Hoosiers are the only ones worth paying for.

[OppositeLock]

Thanks for the clarification. I'll probably do the first couple SCCA events on street tires and see what the competition looks like.

[Shamu]

Originally Posted by AutoX Z

To clarify Hoosier A6s are not slicks, they are DOT race tires. Slicks are a completely different animal and are not allowed in stock or street prepared. If you are going to get some Hoosiers 295/30/19 is the size you want on all 4 corners. I would spend some more time on your stockers before making the jump to r-comps. If you think you're ready to drop 1300 on a set of tires that will last maybe 1/2 season and cannot be driven on the street then by all means.

Ps if you're wondering don't waste you're time with other r-comps like Toyo r888's and the like. Hoosiers are the only ones worth paying for.

I would contend that A6's are very much DOT R slicks as opposed to DOT R treaded tires. An A6 is closer to a radial race slick than a treaded street tire. Compounds the A6 uses are very similar to true race slick compounds as well. I have always found it amusing when some people try to say an A6 isnt a slick but a DOT R race tire. What exactly does that mean in a practical sense as in many venues an A6 is superior to non DOT race slick. Thats especially true now as Good Year and Hoosier have stopped producing many non DOT race slick sizes in soft compounds in favor of supporting road racing compounds that just dont work in AX. Again there are exceptions but really A6 is a slick in general sense of the word. Its not a tire you can drive on the street any more practically than a true radial race slick.

Also I would challenge assumption that A6 is only way to go for a DOT R tire. It depends on your goals and skill level. Toyo R888 is a fair tire and if you need something to drive back and forth to event its far better choice than a A6. Treaded DOT R can also double as an intermediate rain tire where A6 would fail. And tread life will be far greater on treaded DOT tire. I'm actually a fan of Nitto NTo1 as intermediate tire that can be driven to events.

Not everyone is headed to Nationals and having flexibility to run a streetable treaded DOT tire is something many of us who dont want to trailer tires use. My street wheels have R888's and I only use them for local AX now. My race wheels have R6's for track work. A6 is just over priced and only really required if you are out for National Tour or big event win. Also dont ignore the new Good Year DOT R tires. They make a soft AX compound now and cars on Good Year DOTs in San Diego were beating Hoosier clad cars at National tour. I think a few more National title winners will be on Good Year DOT R tires this year. That pretty much puts a stick in things for Hoosier being the " only ones worth paying for".

[AutoX Z]

Originally Posted by Shamu

I would contend that A6's are very much DOT R slicks as opposed to DOT R treaded tires. An A6 is closer to a radial race slick than a treaded street tire. Compounds the A6 uses are very similar to true race slick compounds as well. I have always found it amusing when some people try to say an A6 isnt a slick but a DOT R race tire. What exactly does that mean in a practical sense as in many venues an A6 is superior to non DOT race slick. Thats especially true now as Good Year and Hoosier have stopped producing many non DOT race slick sizes in soft compounds in favor of supporting road racing compounds that just dont work in AX. Again there are exceptions but really A6 is a slick in general sense of the word. Its not a tire you can drive on the street any more practically than a true radial race slick.

Also I would challenge assumption that A6 is only way to go for a DOT R tire. It depends on your goals and skill level. Toyo R888 is a fair tire and if you need something to drive back and forth to event its far better choice than a A6. Treaded DOT R can also double as an intermediate rain tire where A6 would fail. And tread life will be far greater on treaded DOT tire. I'm actually a fan of Nitto NTo1 as intermediate tire that can be driven to events.

Not everyone is headed to Nationals and having flexibility to run a streetable treaded DOT tire is something many of us who dont want to trailer tires use. My street wheels have R888's and I only use them for local AX now. My race wheels have R6's for track work. A6 is just over priced and only really required if you are out for National Tour or big event win. Also dont ignore the new Good Year DOT R tires. They make a soft AX compound now and cars on Good Year DOTs in San Diego were beating Hoosier clad cars at National tour. I think a few more National title winners will be on Good Year DOT R tires this year. That pretty much puts a stick in things for Hoosier being the " only ones worth paying for".

Yes the A6 is very much like a slick but it is not. It just bothers me when people refer to all minimally greased tires as slicks, there is a still a relatively large difference between the two.

It is also my opinion thatif you arent going to make the jump up to A6 then just get a good street tire like an re11 or rs3 and play on those. I drove my car with the oem bridgestones for a year and beat plenty of guys running other rcomps. Also since Hoosier is the only company who makes 19s goodyears are a non-issue to me.

[ChrisSlicks]

Originally Posted by AutoX Z

Yes the A6 is very much like a slick but it is not. It just bothers me when people refer to all minimally greased tires as slicks, there is a still a relatively large difference between the two.

It has no tread and is a super soft compound so to me that is a slick whether it has a circumferential grove or not. The A6 is one of the softest compounds used in racing, the only thing softer is a drag slick.

[Shamu]

Originally Posted by ChrisSlicks

It has no tread and is a super soft compound so to me that is a slick whether it has a circumferential grove or not. The A6 is one of the softest compounds used in racing, the only thing softer is a drag slick.

Well thats not completely true. Plenty of softer compounds than A6 on non DOT race tires however its still very soft and its operating tempreture range is much lower than most race slick compounds.

Remember that DOT R's were born from "cheater slicks" People would buy race slicks and put groves in them to run on the street. About the only differnce between Race slick and DOT R slick is fact that tire has DOT approval which means it has minimum contruction to pass DOT standards and has minimum tread groves to satisfy the DOT regulations. All the suppliers of slick type DOT R tires say for racing only now. DOT R's are very close in construction to regular radial race slicks they are just use a little heavier construction and belt to meet DOT requirements. Tire compounds and construction used in true race slicks tend to be more tolerant of heat as well.

But truely tires like A6 are race slicks by defintion. They are made for racing and they are slicks. Many people use A6 and R6 as they would a radial race slick. In some situations A6 is faster than a non dot slick.