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Thread: Is this a good wheel/tire choice for G stock/STN Reply to Thread
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Topic Review (Newest First)
06-17-2008 02:18 PM
WeeAsp
Quote:
Originally Posted by Killercanary View Post
Dirtydeeds- Thanks, I'll try that next time out. The only reason I'm running them so high is because even at 44-46lbs up front, the side walls show scuff signs. I will try it though.





Thanks! I do check it after every run, and you are right, it goes up 1-2lbs every run. If I do have to wet the tires, should I wet them and then check the air, or doesn't it really matter?
There are a couple of different camps on the "wetting issue".

I personally am indifferent. So, I'll let you draw your own conclusions.

1 camp says that the temperature goes down by cooling with water. You can off set this by reducing the tire pressure. Wetting the tire reduces traction by launching with a wet tire.

The other camp says that cooling the tire with water reduces greasiness of tires as temperatures increase.

I can't tell you if one is better than another.

My experience is that monitoring the pressures is the most effective way to maintain/increase traction.
06-16-2008 10:06 PM
Killercanary Dirtydeeds- Thanks, I'll try that next time out. The only reason I'm running them so high is because even at 44-46lbs up front, the side walls show scuff signs. I will try it though.



Quote:
Originally Posted by WeeAsp View Post
Also, check your pressures after each run.

Pressures increase as the tire temp increases.

So, you may start at 40LBS, but after your run be over 50.
Thanks! I do check it after every run, and you are right, it goes up 1-2lbs every run. If I do have to wet the tires, should I wet them and then check the air, or doesn't it really matter?
06-16-2008 06:54 PM
WeeAsp Also, check your pressures after each run.

Pressures increase as the tire temp increases.

So, you may start at 40LBS, but after your run be over 50.
06-16-2008 05:06 PM
DirtyDeeds You might consider dropping those pressure down closer to 40-42lbs front and 36-38lbs rear.
06-16-2008 03:33 PM
Killercanary Also, I've been running the fronts at 44-46lbs and the rears at 42-44lbs.
06-16-2008 03:30 PM
Killercanary Thanks for the reply. I actually purchased the euro wheels and direzza's already in the 215-40-17 size. I've run them at 2 events and I'm pleased thus far. This is my first year and I'm not too experienced yet, but I do feel that these tires get greasy when hot. They definitely push more on the later runs. I borrowed my buddy's water sprayer yesterday and after wetting them I turned my best time of the day. I purposely didn't wet them after that and ran my second slowest time on my 5th and final run. It could very well be that I'm over driving the tires and cooking them, but I've noticed this definite push the last two times out. I must add this though... on my 1st race with them I noticed this "greasy" feeling from them on the later runs, but my times got faster and faster; this however was not the case yesterday. I'll put up a video later and maybe you can provide me with some feedback to let me know if its me and something I'm doing, or if its the nature of these tires.

On a side note, I've finished 1st in STN (street tire novice) at every event in our summer series this year, and my times were good for two 2nds, one 3rd, and one 4th place this year in GS. I'm so glad I decided to start autocrossing this year and have all but given up drag racing my mustang.
06-12-2008 10:27 AM
WeeAsp I'm getting caught up after a hiatus...

Just to add my .02 worth.

Doug is spot on in every respect.

If I can make a recommendation for the future. In GS, you can run a DOT legal competition tire.

The manufacturers build in a "fudge" factor to the tire design. Smoe, like the BFG and the Hoosier build in 1/2 degree of negative camber into the tire (that's why they are hard to stand up).

They also play with the sizes to allow for greater competition.

For example, I ran the Toyo Proxes RA1 on the stock wheel. A 235/35R17 which is roughly the same height as the stock wheel/tire combination.

Hoosier (my preference) makes a 225/40R17 that is actually closer to a 235 in width (design "fudge"), but much stickier than the Toyo.

The wider tire gives you quicker turn in and response - especially in high speed sweepers and reduces understeer.

Also, they will NOT rub.

Good luck with your season!
05-21-2008 08:16 AM
Killercanary Thanks for all the help everyone. My new shoes showed up yesterday. I got a set of SVT Euro wheels wrapped in 215-40-17 Z1 tires. I'll get some pics up later today if the rain holds off. It was mentioned in another thread that these tires run on the wide side, in my case they appear narrower than the Cooper Sport tires I run everyday on the car.
05-16-2008 02:11 PM
WD40
Quote:
Originally Posted by DognamedMack View Post
I know someone running STS and he told me when he put on 17's he was bumped to STS2.
That's not right at all.
Wheels are unrestricted in STS, other than a 7.5" max width:
Quote:
14.4 WHEELS
A. Any wheels up to 7.5" in width that fit over stock brakes.
Was he running a two seater? (aka CRX, Miata, MR2 etc)
^^^That's primarily what the "2" means in STS2.
In fact, fOCUS isn't even eligible, as the displacement limit in STS2 is 1.9L.
Quote:
14.11 STS2
STS2 follows the STS rule set, but the eligible cars will be restricted to two-seaters with engine displacements of 1.9 liters or less.
05-15-2008 09:28 PM
DirtyDeeds
Quote:
Originally Posted by Schroeder02 View Post
I haven’t auto-x my dunlop’s yet but I have run them on a road course, I stated them at 33 to 34 for a hot temp target of 38 to 38. they seamed to work very well at that pressure I would start them around 36 to 37 then take some air out as they get hot if needed.
We used the Dunlops during a recent track day at Autobahn Country Club and were quite impressed with the level of grip and how well they held up.

The temperature hovered in the mid 30's most of the day. We ran 36lbs all the way around and that worked pretty well us on such a cold day.
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