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post #31 of 42 (permalink) Old 03-12-2017, 01:18 AM Thread Starter
car0800
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I see the lateral accel on the 300ft skidpad is at .84g per the C&D test. How much do you think higher performance tires would improve this number? The stock tires Dunlop SP 5000 are labeled Ultra High Performance All Season.
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post #32 of 42 (permalink) Old 03-12-2017, 10:00 AM
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I see the lateral accel on the 300ft skidpad is at .84g per the C&D test. How much do you think higher performance tires would improve this number? The stock tires Dunlop SP 5000 are labeled Ultra High Performance All Season.
1) That depends upon the tire. For example, if you put a Dunlop ZII Star Spec on the car, you would notice a very significant difference. I don't know what the number would be, but I'd guess that if .84 can be had from something as hard as the 5000, then you'd see north of .90 on the ZII SS.

2) Unless lasting 45,000 miles qualifies, there's nothing "high performance" about the Dunlops that come on the car in the States. They're just adequate everyday tires that are fine for the average buyer.
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post #33 of 42 (permalink) Old 03-12-2017, 12:51 PM
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Originally Posted by car0800 View Post
I see the lateral accel on the 300ft skidpad is at .84g per the C&D test. How much do you think higher performance tires would improve this number? The stock tires Dunlop SP 5000 are labeled Ultra High Performance All Season.
All season radials are a compromise tire that gives you a little bit of everything but do nothing terribly well. Ultra High Performance all seasons do that same nothing terribly well even better I guess. However, they are far better than the cheap OEM crap that was on my car.
Super sticky summer tires would of course improve things some, but only to the limits of what the suspension can handle. You really need some suspension upgrades to take full advantage of actual performance tires.
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post #34 of 42 (permalink) Old 03-12-2017, 02:27 PM
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Good points @arathol . I am going to test a small part of what you have written, by getting the Michelin A/S 3+'s which are known for very sharp turn in (some would say too much), and see if that helps understeer. While probably not, it is worth to me to try them for a week.

Guessing however, that I will still be getting the Progress RSB's, maybe even ordering them just a day or two into my own test.

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post #35 of 42 (permalink) Old 03-12-2017, 03:22 PM
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Originally Posted by Road Trip View Post
Good points @arathol . I am going to test a small part of what you have written, by getting the Michelin A/S 3+'s which are known for very sharp turn in (some would say too much), and see if that helps understeer. While probably not, it is worth to me to try them for a week.

Guessing however, that I will still be getting the Progress RSB's, maybe even ordering them just a day or two into my own test.
The Michelin PS A/S 3s seem to be pretty stiff, which is the reason for the sharp turn in. That won't help with the understeer. Stickier tires won't change it either. The same degree of understeer will still be there, but it will happen at a higher speed with possibly more unfortunate results. This is what I referred to above when I suggested suspension upgrades. When pushed hard, sticky tires can quickly overwhelm the stock suspension to the point that it is no longer functioning. After that point is reached the only thing holding the car on the road is the tires. Go past the limits of adhesion or just upset the car in some way and you can find yourself going on safari before you can react. To really take full advantage of performance tires you need higher spring rates that can handle the level grip provided.

The rear sway bar will change how much the car understeers however. It adds to the cumulative spring rate in the rear and changes the roll centers, shifting more grip to the front wheels.
Less roll less weight transferred to the outside tire less grip reduces understeer

Don't forget to order some upgraded adjustable end links to go with the sway bar.

Last edited by arathol; 03-12-2017 at 03:24 PM.
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post #36 of 42 (permalink) Old 03-13-2017, 02:28 PM
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How many miles do the stock '2015 Mazda3i sport' tires last?
I'm at 35k miles and they still have plenty of tread left.

Anyway, when its time to replace, I plan to get the Michelin - Premier A/S.
it's #1 rated on Tirerack:
https://www.tirerack.com/tires/surve....jsp?type=GTAS

$129 at Costco.


Good choice? Other tires at Costco you would recommend for my car?

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post #37 of 42 (permalink) Old 03-13-2017, 02:36 PM
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Great choice; just finished researching tires for my daughter's Camry, and that is the one I recommended to her.

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post #38 of 42 (permalink) Old 03-15-2017, 09:10 PM
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I put the Micheline Premiers on my wifes car and the Pilot Sport As/3's on mine. Both great tires but the Sport AS3's do have a performance advantage you can feel on the road. Little stiffer, turn in ect... next time she'll get the As3's as well.
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post #39 of 42 (permalink) Old 03-16-2017, 12:01 AM
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I put the Micheline Premiers on my wifes car and the Pilot Sport As/3's on mine. Both great tires but the Sport AS3's do have a performance advantage you can feel on the road. Little stiffer, turn in ect... next time she'll get the As3's as well.
Thank you. Good analysis and feedback to us. Question please, are yours A/S 3's or A/S 3+'s?

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post #40 of 42 (permalink) Old 03-17-2017, 06:06 PM
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Thank you. Good analysis and feedback to us. Question please, are yours A/S 3's or A/S 3+'s?
A/S 3's not the +..... I used them in a bit of snow and they're reasonable all seasons. Better than the stock Yok's in the snow but def not snow tires like the Blizzak's or Xice i'm running

Last edited by zx6rrdan; 03-17-2017 at 06:08 PM.
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