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YOUR RESEARCHCan it really just be the Tyres
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Please select the size installed on your vehicle from the choices below.
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Hi Guys. I have a 2002 996 , only owned it approx 3 weeks been really happy with it . Seems to drive great and handle well . But this is the thing ive just had the 18 inch split rims re-furbed and decided to put a couple of new rear tyres on. I went for Uniroyal rain sport 3's but since they have been on the car it wallows and snakes and feels really loose above 70 mph almost to the point it cuts the psm in . As ive only had the car a few weeks and didnt drive it hard before having the tyres done im not 100% sure some of it wasnt there before. can it really be the tyres or is there something else that could be causing the symptoms. any advice please. Thanks
Dunno just a wag. Are your front tires the same manf? Also could be a faulty sensor? I'm just guessing though. Might want to take it to somebody for a look.
Never mix and match tires on a 911.
Also what you're experiencing is the mold release getting worn off. It takes about 200 miles. Can be a little greasy till then.
Ill be so surprised if its just the tyres ,never experienced it on any other vehicle, when you look in the rear view mirrors looks likes its swaying / wagging its tail 3-4 inches
Don't discount it... Are the fronts a summer performance tire? Sounds like the rears are all season tires. I can also attest to new tires being greasy. Does this happen on a straight or in corners?
Tires have to be suspect #1.
Now I'm not going to jump right in a state the non n-rated tires are the blame (I'll save that for later�).
Are the tires the right size? Go out and look. Check both tires. Not only size, but other things too, like wear rating, speed rating, the whole nine yards.
While you are there check that if they are uni-directional they are mounted the right direction.
Check tire pressures. Check all 4 tires.
Are the lug bolts properly torqued? This could have you loosening them then torquing them using an accurate torque wrench.
Sneaky Pete has already mentioned the two piece wheels and the bolts that hold the pieces together, which is a good suggestion.
While new tires are greasy the car shouldn't squirm or wiggle or act up just going down the road from this greasiness. Where it comes into play is the tires take some miles to develop their best grip.
What did the old tires look like? Even tread face wear? Did you get reasonable (>15K miles) life from them? If they were worn unevenly, had a short life, the problem would be bad alignment that is being magnified by the new tires.
If you eliminate all other explanations then you are left with its the tires.
Sounds like directional tires mounted backward. I put mine back on once after brake bleeding and did that. Felt like the car was doing the shimmy shake.
Uniroyal Rainsport 3's are NONdirectional tires, so that is unlikely to be it. Could still be the tires though. Was this one road or several different roads and if one road was it a grooved concrete highway or good, smooth asphalt? I know my snowtires (Blizzak's) are less stable on grooved concrete than my summer tires.
I had summers on the front and the tire shop put all seasons on the back. Felt like the backs were flat when taking corners at speed...really horrible feeling. Once the proper tires were put on the back (summers) it was all fine.
So dont discount how mixing tires can totally mess with your handling.
I'm not sure I ever heard of someone putting uni royals on a 996? When I bought my car is had three old p Zeros on and an off brand cheapie from les Schwab. No issues however - but I did swap that out for a used p Zero ASAP. If you want to cheap out go with sumitomo htrz3 or if you need snow capable tire conti dws .
Floaty back end problem could be engine mounts - search threads on issues relating to that ..but I also think uni royals would be #1 culprit ...
Many thanks for all the comments, because it was noticeable fairly soon after changing the tyres like 3 miles up the road , im pretty sure you guys are right . Yeh i did the normal checks they have an outside marker on the tyres which is correct , the tyre pressures im running are 34/44 the sizes are correct 265/35/18 y rated 186mph xl load rated . Tomorrow im ordering some bridgestones to match the fronts also n rated . Thanks again i will let you know the outcome !
Have you checked the tire balance? Take them to a different shop that is equipped with a Force Balancer. I had a similar situation when I got all four new Hankook V12's on my C4S. The shop that put the Hankooks on had no idea how to properly balance the tires - they were WAY off and made me think that all of my rims were bent it was that bad - not the case of course. I agree with all of the above comments about having matching tires. air pressures, etc., but balancing is key on wheels of these cars.
"Yeh i did the normal checks they have an outside marker on the tyres which is correct , the tyre pressures im running are 34/44 the sizes are correct
265/35/18
y rated 186mph xl load rated . Tomorrow im ordering some bridgestones to match the fronts also n rated . Thanks again i will let you know the outcome ! "
I thought that by 2002 they had 285/30/18 on the rear?
From Tire Rack
Original Equipment Sizes for 2002 Porsche 911 Carrera Coupe
Alert Porsche equips your vehicle with more than one possible size during production.
Please select the size installed on your vehicle from the choices below.
Original Equipment Front Size 1: 205/50-17
Original Equipment Rear Size 1: 255/40-17
___________________________________________________________
Original Equipment Front Size 2: 225/40-18
Original Equipment Rear Size 2: 285/30-18
Don't trust tire racks info (or tire shops for that matter). According to them our tire sizes were not an option for either the 996.1 C4 or 328xi. The 996 wheels were an upgrade, but they came on the car. The BMW's were the standard wheels that MY
We always have to order by size which usually includes having to drag the shop manager out to prove that we indeed know what we are talking about and their computer is wrong...
Well gnat you could always 'drag out' the manual that came with the car and see that 285/30-18 were the optional 18" tire on 2002 > 996.
Or maybe look at the inflation sticker and see that 285/30-18 were the optional 18" tire on 2002> 996.
'02 targa had 265/35-18 - I think - at least that's what mine has now - I presume to smooth out the ride a bit so roof didn;t shake itself apart - spring rates are different too ..
I know perfectly well that the wheels and associated sizes were a factory option without reading the manual, because we ordered it that way. I also couldn't care less about the optional tire sizes for a MkII since I have a MkI.
The problem isn't what I know about the car/tires, it's what the computer systems of various tire shops (including tire rack) thinks were the optional tire sizes.
All I'm saying is don't trust the "these fit your car" recommendations without verifying the size specs yourself.
Uniroyal's removed Bridgestone n-rated fitted car transformed utterly transformed you truly wouldn't believe it (or maybe you would) . Even though the same size the n-rated tyre is physically wider and has a much stiffer sidewall. Thanks
