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Wheels and Tires Talk Sponsored by The Tire Rack Discuss issues related to wheels and tires

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Old 06-18-2011, 11:06 PM   #1
caper

 
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understearing now?!

first time i felt the stability control really come on in a turn. wasnt go way fast, nothing i didnt do before on stock tires without an issue, but now with 275 on front and 315 rear, it seems to push enough for the nannys to kick in enough to feel it. shouldnt be doing better not worse in the cornering dept?? the 275 and p zero rosso, so they should be as goos as the originals. the 315 are sportmax run flats.

btw this is a long sweeping turn with slight throttle input, not on the brakes. it is downhill but like i said, i dont feel like i am going THAT fast or anywhere near the edge of grip ... car doesnt give any signs of traction issues up to that point.
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Old 06-18-2011, 11:34 PM   #2
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Wider rear wheels and tires reduce OVERsteer, hence INCREASE UNDERsteer--without any other compensating adjustments. You will need different swaybars now to approach a more neutral cornering attitude.

I have 9.5" wheels up front with 275/40's and 11" wheels in back with 315's, but I have the Pedders Xa's and Solution B swaybars. I feel my car has just a touch of understeer now, which I can convert to neutral/oversteer with a little throttle.

I went through some tight twisty mountain roads recently at over 50 MPH, the curves were posted for 25 mph. I don't recall my tires even squealing through those turns.
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Old 06-18-2011, 11:54 PM   #3
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Probably doesn't help that you're running different rubber compound front and back.

I'm running 265s up front and 315s out back with no noticable difference in nanny control... and I like to get on it when going through the twisties!!
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Old 06-22-2011, 06:55 PM   #4
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I agree that is not a good mix your running. Runflats have a much stiffer side wall than a standard tire. This is probably leading to the handling issues and not the sizes.
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Old 06-22-2011, 09:01 PM   #5
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Yea, something isn't right, stabilitrac kicks in way to early. With it off I take turns with no issue at all. Same speed with it on, crappy. Like someone throws an anchor out,
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Old 06-22-2011, 09:05 PM   #6
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Runflats suck
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Old 06-23-2011, 08:19 AM   #7
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Quote:
Originally Posted by Rudy@Tirerack View Post
I agree that is not a good mix your running. Runflats have a much stiffer side wall than a standard tire. This is probably leading to the handling issues and not the sizes.
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Old 06-23-2011, 05:04 PM   #8
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i dont think its the sizes, but something is messing up the stabilitrack...like i said when i take these turns without it on, i get no slide, no push etc...but with it on, its as if the car cuts out. i dont have a lot of faith in it now...BTW i have charged some pretty hard turns before, and it never cut in. i cant really push it to see where the limit of grip is on the street but i know i am not at it when the stabilirack is cutting in. if you were in my car you would think there was something wrong with it.
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