[19bwb67]

hi all,  was wondering what peopled thought about going 225r16 50 92V
  245r16's <span style="font-size:24px;">94W
in the rear. i currently have yokohama avs es110's of the same size but also with the same load ratings  and i hate them. can't find a tire pressure i like . rear just slides away like on grease with no warning during hard cornering. im used to them now but...  thanks in advance. Brett</span>

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[MCL968]

Snap oversteer may be the result of a suspension issue, unless the tires are really old and the compound has hardened. You may want to check the other parts before you blame the tires.

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[az968]

Have you checked the age of the tires? Age will make them harder faster than miles. Most of our don't drive our cars enough to wear out the tires before they age out. And as stated avove check rear suspension for something that is shifting around.

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[Rap]

Isn't snap oversteer weight transfer generally caused by lifting from the throttle? If you're sliding perhaps you just passed the grip of adhesion. Lots of different factors of course and certainly nothing wrong with sliding around a corner or turn. As long as you planned it or knew you would be close to it. What was the temp outside? Cold tires under the temp they perform at can exhibit this behavior.

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[94SilverCab]

Answering the topic of this post, I have never had success mixing tires on any automobile, so, for that reason, I would argue against it.

 

The type/quality of tires (and pressures) deeply affect performance, but if you are having serious handling issues my suspicion is that your trouble is much deeper, as suggested above.

 

Jay

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[Bulti]

When was your allignment checked?

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[94SilverCab]

Not just alignment, also drop links, bushings, castor blocks....etc., etc...

 

Jay

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[19bwb67]

tires have always sucked in my opinion right from day one when it was perfectly aligned. i had dunlop d40' or d60 )iforget on a 944 and it hadnled like on rails very easy to detect rear slippage and i could control it perfectly just by the throttle pedal alone. very reassuring and forgiving

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[19bwb67]

I put slightly wider tires on for more grip but now I'm thinking go back to stock. Everything else is stock. Opinions appreciated

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[Bulti]

If you are happy with the way the stock size grips and looks, change them back. It would save money both on buying tyres and gas mileage.


Some might argue you can never have enough grip though :-)

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[ds968]

I think the incremental difference is negligible. Perhaps if you cosntsietntky push the car to 100 % of its capability it might be worth the extra grip, otherwise a highly rated tire in stock size will be perfectly fine. IMHO ..

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[Bulti]

'cosntsietntky'? Are you trying to speak Polish or have you been trying a bottle of 2 of Pinot already Dan :-))

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[wildcat]

When I first got the car I put some BF Goodrich TA radials, which I have always loved for traction. They just don't slip. Well I took it into the dealer and they did their "World Class Inspection" and one of the items they noted was that my tires weren't "Porsche Approved".  I wondered about this because the TA's really grip, but I brushed it off. I thought maybe it was because it would put too much stress on the torsion bars or something, they didn't say.  Well I got some new tires because some delinquent decided to practice his knife wielding skills. The new ones are definitely slipperier and I can get them to break fairly easily. I like a little slide and it is controlled with these but I'll go back to the TAs. (Porsche Approved or not) because they really grip.

 

On a side note, it seems to me that "sliding" is in vogue on high end sports cars. I see them at the track sliding around in a diagonal fashion.  Maybe its a cool way to test the new traction control systems, I don't know, but I wonder if these new tires are being made that way intentionally.

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[Big Carl]

It funny you mention that; I just got done reading about the previously unknown to me "N" rated tires from Porsche.

 

All the tire info you need is here, including explaining the Porsche endorsement process.

 

http://www.carbibles.com/tyre_bible.html

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[ds968]

'cosntsietntky'? Are you trying to speak Polish or have you been trying a bottle of 2 of Pinot already Dan :-))

Tak ! ( to both parts of the question ) :-) . No idea what happened there ..typing in a rush and not paying attention before posting .

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[flash]

i'll chime in against mixing tires.  it causes each end of the car to react differently to the same input.  this can be tragically unpredictable.

 

as for the snap oversteer, this can be due to a number of things.  shock settings, if you have them, can be one of them.  too little pressure in the tires is a common cause.

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[wildcat]

It funny you mention that; I just got done reading about the previously unknown to me "N" rated tires from Porsche.

 

All the tire info you need is here, including explaining the Porsche endorsement process.

 

http://www.carbibles.com/tyre_bible.html

Very interesting reading. Mixing tires will get you from point A to point B in an emergency, anything else is irresponsible.  

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[wildcat]

As a side note, per the conversation on Porsche "N" rated tires, it centers around the 911 which is notoriously tail heavy unlike the 968.  They also make comment on mixing tires.  The center of gravity on the 968 changes the equation considerably.  Both the BF Goodrich TA sport and the Mirage tires I currently run have worked very nicely.  The Mirage give you a little slide before they grip, which I like. The TA's do not. The car is light enough that I was unable to break traction on other than slippery surface.  I do not have a SC installed however,. 

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[wildcat]

Just out of curiosity I checked all the major tire distributors and could find no tires that were N rated for the 16" rims.  So "World Class Inspection" has a dubious distinction.  

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[IndischRot968]

Not many but there some N rated tyres for 16 rims. Namely:

Michelin Pilot Exalto 2 - N0

Continental Sport Contact - N2

Pirelli P Zero asimmetrico - N3

Pirelli P Zero Rosso - N4

Bridgestone Potenza S02 - N3

Bridgestones used to be amazing but weared out incredibly quickly. 

 

Porsche has its "List of tyres for vintage cars and recent classics" on its US site.

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