2000 Miata tire wear, irregular, what to suspect?

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2000 Miata tire wear, irregular, what to suspect?
Josh 26 January 2005 00:43:54
	2000 Miata, third set of tires, and I did a "performance" alignment whose specs I don't recall at the moment, but was reasonably close (close as they could get) to the recommended specs from Miata.net back in 2001 when I had it done: FRONT Caster +4.7 to +5.5 (what ever the maximum attained is) Camber -0.6 to -0.8 (this number varies with the caster) Toe 1/16" per side, or 1/8" _total toe out_ REAR Caster not applicable, there is no adjustment possible Camber -1.1 Toe 1/16" per side, or 1/8" _total toe in_ or zero So this third set of tires (which I hate... Falken Ziex 512 185/60-14's at 34psi rear, 35psi front), and after about 10K they wear as follows: front left, severely worn outside edge, very little wear elsewhere front right, worn outside edge, not as bad as left rear both sides, inside edge very worn, and rest of tire about 2x as worn as front also, the car of late (last couple of months) has gotten extremely tail-happy. just regular corners, like in and out of parking lots, etc., send it into throttle oversteer very easily. and did I mention, I hate these tires? ultra flexy and other than having good rain/straight-line grip, bad grip in general. So I will be looking into some new tires soon and want to get it aligned again, but need some suggestions as to what is likely causing my tire wear to be as it is before eating up another set of tires. Car has ~30k since last alignment... haven't gotten over 20K from any set of tires yet. I drive pretty aggressively but basically commute in the car.
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Chuckk 26 January 2005 07:32:47 [ permanent link ]
	For better or worse-- As my 99 came off the rack 12/31/04 (180lbs drivers seat) ~69,000mi Adjusted to more or less center of stock spec. Fender to axle center distance NOT adjusted, seemed to be within limits of measurement without exactly locating center of axle and exact spot on fender to measure from. 15" Toyos T1-S (Whichever it is) 29psi my gauge Left Right -0.4deg Camber -0.3deg +/- .1deg dither 6.2deg Caster 6.2deg 6.2 max attainable this car both sides 0.06in Toe(in) 0.08in +/- .01 rack dither 11.6deg SAI 11.8deg 11.2deg incAngle 11.5deg Cross camber -0.1deg +/- .1 rack dither Cross Caster 0.0deg " " Cross SAI -0.2deg " " Total Toe 0.14in +/- .02 rack dither Rear Left Right -1.0deg Camber -0.6deg 0.03in Toe (in) 0.02in Cross Camber -0.4deg Total Toe 0.05in Thrust Angle 0.01deg At these settings, there is noticable torque steer when the turbo is at or above 6psi or so boost. Perhaps the stock bushings and mounts are a bit soft? I haven't tried playing with the tailshaft to differential offset (yet) "Leon van Dommelen" <rammm@REMOVE_THIS_TAGdommelen.net> wrote in message news:i7ndv0l23gjbkl3590fk4lhmqd89kvgkuq@4ax.com...> josh <dont@mail.me> wrote:> 2000 Miata, third set of tires, and I did a "performance" alignment whose>>specs I don't recall at the moment, but was reasonably close (close as >>they>>could get) to the recommended specs from Miata.net back in 2001 when I had>>it done:>> FRONT>> Caster +4.7 to +5.5 (what ever the maximum attained is)>> Camber -0.6 to -0.8 (this number varies with the caster)>> Toe 1/16" per side, or 1/8" _total toe out_>> REAR>> Caster not applicable, there is no adjustment possible>> Camber -1.1>> Toe 1/16" per side, or 1/8" _total toe in_ or zero> Do a new alignment and post the old and new numbers to satisfy> our curiosity.> So this third set of tires (which I hate... Falken Ziex 512 185/60-14's at>>34psi rear, 35psi front),> What were the wear characteristics on the previous two sets?> and after about 10K they wear as follows:>> front left, severely worn outside edge, very little wear elsewhere>>front right, worn outside edge, not as bad as left> Increase negative camber to take wear off the outside edge?> rear both sides, inside edge very worn, and rest of tire about 2x as worn >>as>>front> Decrease toe. Increase camber if evidence of wear on outside edges.> also, the car of late (last couple of months) has gotten extremely>>tail-happy. just regular corners, like in and out of parking lots, etc.,>>send it into throttle oversteer very easily.> Seems easy. You just told us that the thread areas you drive on> are severely worn. If you no longer have good rubber on the road,> you do not have good traction.> and did I mention, I hate these tires? ultra flexy and other than having>>good rain/straight-line grip,> Interesting in view of the high pressure.> bad grip in general.> Well, that is already noted in the product reviews on miata.net.> So I will be looking into some new tires soon and want to get it aligned>>again, but need some suggestions as to what is likely causing my tire wear>>to be as it is before eating up another set of tires.>> Car has ~30k since last alignment... haven't gotten over 20K from any set >>of>>tires yet. I drive pretty aggressively but basically commute in the car.> Not clear to me why you need the toe then. Though I believe toe> in at the rear does help stability. Lannny's alignment may be a> better choice.> Leon> -- > Leon van Dommelen Bozo, the White 96 Sebring Miata .)> rammm@dommelen.net http://www.dommelen.net/miata> EXIT THE INTERSTATES (Jamie Jensen)
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Lanny Chambers 26 January 2005 10:19:53 [ permanent link ]
	In article <ct730i$ua$1@ngspool-d02.news.aol.com>, "chuckk" <nospam@email.compuserve.com> wrote: Rear> Left Right> -1.0deg Camber -0.6deg Don't do anything until this is fixed. -- Lanny Chambers, St. Louis, USA '94C the alignment page: http://www.hummingbirds.net/alignment.html
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Gixer 26 January 2005 15:23:39 [ permanent link ]
	At these settings, there is noticable torque steer when the turbo is at or > above 6psi or so boost. How the hell do you get Torque Steer on a rear wheel drive car? You guys getting special rear wheel steering MX-5's in the States? Or you drifting the car EVERYWHERE? ;) "chuckk" <nospam@email.compuserve.com> wrote in message news:ct730i$ua$1@ngspool-d02.news.aol.com...> For better or worse--> As my 99 came off the rack 12/31/04 (180lbs drivers seat) ~69,000mi> Adjusted to more or less center of stock spec.> Fender to axle center distance NOT adjusted, seemed to be within limits of > measurement without exactly locating center of axle and exact spot on > fender to measure from.> 15" Toyos T1-S (Whichever it is) 29psi my gauge> Left Right> -0.4deg Camber -0.3deg +/- .1deg dither> 6.2deg Caster 6.2deg 6.2 max attainable this car both sides> 0.06in Toe(in) 0.08in +/- .01 rack dither> 11.6deg SAI 11.8deg> 11.2deg incAngle 11.5deg> Cross camber -0.1deg +/- .1 rack dither> Cross Caster 0.0deg " "> Cross SAI -0.2deg " "> Total Toe 0.14in +/- .02 rack dither> Rear> Left Right> -1.0deg Camber -0.6deg> 0.03in Toe (in) 0.02in> Cross Camber -0.4deg> Total Toe 0.05in> Thrust Angle 0.01deg> At these settings, there is noticable torque steer when the turbo is at or > above 6psi or so boost.> Perhaps the stock bushings and mounts are a bit soft? I haven't tried > playing with the tailshaft to differential offset (yet)> "Leon van Dommelen" <rammm@REMOVE_THIS_TAGdommelen.net> wrote in message > news:i7ndv0l23gjbkl3590fk4lhmqd89kvgkuq@4ax.com...>> josh <dont@mail.me> wrote:>> 2000 Miata, third set of tires, and I did a "performance" alignment whose>>>specs I don't recall at the moment, but was reasonably close (close as >>>they>>>could get) to the recommended specs from Miata.net back in 2001 when I >>>had>>>it done:>>> FRONT>>> Caster +4.7 to +5.5 (what ever the maximum attained is)>>> Camber -0.6 to -0.8 (this number varies with the caster)>>> Toe 1/16" per side, or 1/8" _total toe out_>>> REAR>>> Caster not applicable, there is no adjustment possible>>> Camber -1.1>>> Toe 1/16" per side, or 1/8" _total toe in_ or zero>> Do a new alignment and post the old and new numbers to satisfy>> our curiosity.>> So this third set of tires (which I hate... Falken Ziex 512 185/60-14's >>>at>>>34psi rear, 35psi front),>> What were the wear characteristics on the previous two sets?>> and after about 10K they wear as follows:>>> front left, severely worn outside edge, very little wear elsewhere>>>front right, worn outside edge, not as bad as left>> Increase negative camber to take wear off the outside edge?>> rear both sides, inside edge very worn, and rest of tire about 2x as worn >>>as>>>front>> Decrease toe. Increase camber if evidence of wear on outside edges.>> also, the car of late (last couple of months) has gotten extremely>>>tail-happy. just regular corners, like in and out of parking lots, etc.,>>>send it into throttle oversteer very easily.>> Seems easy. You just told us that the thread areas you drive on>> are severely worn. If you no longer have good rubber on the road,>> you do not have good traction.>> and did I mention, I hate these tires? ultra flexy and other than having>>>good rain/straight-line grip,>> Interesting in view of the high pressure.>> bad grip in general.>> Well, that is already noted in the product reviews on miata.net.>> So I will be looking into some new tires soon and want to get it aligned>>>again, but need some suggestions as to what is likely causing my tire >>>wear>>>to be as it is before eating up another set of tires.>>> Car has ~30k since last alignment... haven't gotten over 20K from any set >>>of>>>tires yet. I drive pretty aggressively but basically commute in the car.>> Not clear to me why you need the toe then. Though I believe toe>> in at the rear does help stability. Lannny's alignment may be a>> better choice.>> Leon>> -- >> Leon van Dommelen Bozo, the White 96 Sebring Miata .)>> rammm@dommelen.net http://www.dommelen.net/miata>> EXIT THE INTERSTATES (Jamie Jensen)>
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2000 Miata tire wear, irregular, what to suspect?

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