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Old 02-10-2004, 10:25 PM   #1
unity
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Question New tires = smoother shifting?

Let me preface this post by saying that I am starting to doubt my own sanity. What I am about to post should not, as near as I can figure, be happening.

I just got some new Kumho Ecsta ASX tires to replace the tired OEM RE92s on my 2002 WRX sedan. (BTW, the Kumhos are a significant improvement over stock tires... no surprises there I guess) The weird thing... and this is what has me doubting my ability to accurately perceive reality… is that I swear my car shifts more smoothly than it did with the old tires. I have been driving standard transmission cars for about 10 years now and I can execute a pretty smooth shift on most any other car, but my WRX has always been tricky. It would frequently catch and jerk on even the most carefully executed shifts. Now this problem seems to have resolved itself. Like Kaiser Sose… poof, its gone.

So what is going on here? Am I crazy? Did my ability to shift coincidentally and dramatically improve after I got the new tires? Could tire weight or balance be factor here? I am open to any explanations at this point.
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Old 02-10-2004, 10:40 PM   #2
strangerq
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Differences in tire pressure between front and rear can definitely effect the wrx drivetrain and chassis.

On re32's with my rex i had problems with tranny decel noise and quirky abs. Got rid of the re32's....no mo problemo.
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Old 02-10-2004, 10:42 PM   #3
Samirr76
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re-32s? lol!
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Old 02-11-2004, 01:00 AM   #4
bull3964
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Kind of a tangent, but how do you like the ASX's? I'm seriously looking at them for my next tires. How stiff is the sidewall? I like very good turn in response.
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Old 02-11-2004, 05:20 AM   #5
ml2316
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maybe it affects the awd. maybe with poor tires and traction the awd has to respond to traction loss more often. so when you disengage, then reengage the clutch during a shift the sudden torque (from reengaging the clutch) causes a little bit of traction loss (with poor tires) and the awd responds, so you feel a little bit of a disruption in the ride. i'm no expert and i could be waaaay off though.
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Old 02-11-2004, 08:09 AM   #6
unity
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Quote:
Originally posted by bull3964
Kind of a tangent, but how do you like the ASX's? I'm seriously looking at them for my next tires. How stiff is the sidewall? I like very good turn in response.
I really like the ASX's. I am still trying to break them in a little bit before I start testing their limits but I can tell you that my car handles and feels a *lot* better at any speed.

Not really sure about the sidewall stiffness. Let me know how I can measure that and I will let you know.

Sometimes I think that the Kumho's are a touch louder than the RE92's but they handle so much better that I have all but dismissed that issue.

To everyone else thanks for your replies. I think I feel my sanity returning.
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Old 02-11-2004, 10:13 AM   #7
bull3964
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Quote:
Originally posted by unity


Not really sure about the sidewall stiffness. Let me know how I can measure that and I will let you know.
Well, with the RE92s at stock pressure (32/29) I would get mad sidewall scuffing if I pushed the car moderatly hard. On my BF Goodrich KDWS tires, I could practically autocross on the stock tire pressues and not get any sidewall rollover.

I would get the KDWS again except that their snow traction is a touch worse than the RE92s. At the same time, I'm not sure I would be satisfied with the dry/warm performance of SP5000 or the Continentials.

These Kumhos are my last ditch chance to not have to buy dedicated winter and summer tires.

Once you get some miles on them and broken them in, I think a lot of people in the Tire forum would like to hear a mini-review. Luke has already tested them in the snow and they fare quite well.
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