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Registered
Join Date: Sep 2012
Posts: 388
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Tire Issue??
Hey Guys-
I'm cross posting this from RL Car is a '91 964T with 18" Speedlines. So today I went for a nice drive - 300+ miles - mix of curving two lanes, some highway, a few mountain passes... But the car just didn't feel right. It was unstable at speed. Uneven road surface would move the car around. When passing slow moving traffic and I had to pass over the road's crown - it would hesitate then as one side got over it would dart over too fast. I felt like I was all over the road. At first I thought tire pressures were off - double checked and they were fine (36F/44R). Then for a while I was thinking the alignment was off. But it brakes straight and accelerates straight. And it was fine a few weeks ago. Then I got thinking about the tires. I just put new 285/35 Michelin Pilot Super Sports on the back - replacing a previous set (which I really liked). I took me awhile to figure this out - but the way the car was handling brought me back to when I first got the car and tried some Hankook tires. They were not good. At all. It was like the car was today (but worse with the Hankooks) The first set of Michelins was awesome but with the new rears - something has changed. What are people's experience running new rears with old fronts (Michelin Pilot SS's up front, too)? There's no N rating to watch, right? I'm wondering if the half used up fronts are "stiffer" with less tread compared to the new rears with full tread depth and it's throwing the balance off? I thought it was common to replace rears and not fronts..? Any thoughts appreciated. Thanks Brandon
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Brandon '91 911 Turbo '87 325i Convertible '16 Audi Allroad Denver, CO |
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07-03-2016, 05:06 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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I usually get slippery traction for the first 50 to 100 miles.
Are you sure the lug nuts are tight? |
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07-03-2016, 05:56 PM
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Registered
Join Date: Aug 2007
Location: Austin
Posts: 581
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Check your spring plate bushings, something a 964/965 has that a 911/930 does not .
mine where bad and caused the car to wander and walk around when on /off the gas |
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07-04-2016, 05:08 AM
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Registered
Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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Quote:
911 chassis spring plates have bushings, they have to have something to pivot on where they attach to the torsion bar tube that's welded into the chassis. 964 rear suspension doesn't have torsion bars, trailing arms, or springplates.. it's a totally different design coil spring independent rear suspension that's all around better. |
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07-05-2016, 06:10 AM
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Registered
Join Date: Aug 2007
Location: Austin
Posts: 581
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behold 964 - 965 spring plates
http://www.elephantracing.com/suspension/monoballs/images/964-spring-plates-installed-800.jpg |
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07-05-2016, 07:22 AM
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Registered
Join Date: Apr 2007
Location: wisconsin
Posts: 2,553
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I ran new fronts with 7 year old rears on the track, and it was fine.
As an aside, you are running 44psi in the rears cold?! That seems awefully high. Most tires take 50psi max, and you are almost certainly over that warm/hot... My 930 is 33/36... |
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07-05-2016, 07:41 AM
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Registered
Join Date: Jul 2008
Location: Central Washington State
Posts: 4,398
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Quote:
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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07-05-2016, 05:05 PM
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Registered
Join Date: Apr 2007
Location: wisconsin
Posts: 2,553
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Quote:
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07-06-2016, 03:59 AM
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Registered User
Join Date: Mar 2016
Posts: 1,219
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I would also check for rotation is right,i had a tire store once put the tire with the arow going the other way.
Sent from my SM-N910T using Tapatalk |
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07-06-2016, 02:26 PM
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