View Poll Results: When setting ride height I do:
It by the book and set it to exact specs.
27
72.97%
It by wheel well height.
10
27.03%
Not know what the hell this guys talking about I drive a 924
0
0%
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Simple ride height queastion and poll
06-11-2009, 11:44 PM
#1
Race Car
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Simple ride height queastion and poll
As you guys know I just finished my shock and spring change after 6 months. I took the car in for an alignment today and I started thinking about the new wheels changing the alignment specs. Guy that did it didn't think it would matter but it brought another question to my mind. Of coarse after doing shocks and springs I've had to deal with the wonderful ride height issue. Set ride height drive car reset ride height and drive car. Here's my question. I went from 16" PD's to 18" carrera lites does the same stock ride heights still apply? Wouldn't they be off due to the larger wheels? Just wondering I'm sure the 928 GODs know this answer
06-11-2009, 11:53 PM
#2
Drifting
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The alignment won't change with different wheels. Your ride height as measured to the proper suspension points will read differently if the wheel diameters are bigger. If the wheels are 20mm taller, then your #s will be half that (10mm) more.
06-11-2009, 11:57 PM
#3
Under the Lift
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Larger TIRE diameter raises the ride height, but it doesn't change the suspension geometry, so it doesn't change alignment.
With larger wheels, you would normally run lower profile tires and try to get close to stock tire diameter and keep ride height unchanged.
With larger wheels, you would normally run lower profile tires and try to get close to stock tire diameter and keep ride height unchanged.
06-11-2009, 11:58 PM
#4
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Larger rim diameter does not matter. Larger tire diameter raises the ride height, of course, but it doesn't change the suspension geometry, so it doesn't change alignment.
With larger wheels, you would normally run lower profile tires and try to get close to stock tire diameter and keep ride height unchanged.
With larger wheels, you would normally run lower profile tires and try to get close to stock tire diameter and keep ride height unchanged.
06-12-2009, 12:02 AM
#5
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Ok here's what I got. The 225/50/16 tires were 24.9" and the 265/35/18 are 25.2" from tirerack specs. What do you think now?
06-12-2009, 12:09 AM
#7
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Bill, would a different offset change the ride height? I am thinking that if you mounted a wheel with lower offset (i.e. farther outboard), the longer lever-arm would compress the spring a little more and reduce ride height a bit.
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06-12-2009, 12:12 AM
#8
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You're fine going with the generally published spec -- 0.15" isn't enough to throw that off. If there were a drastic difference, I would say go with the tech specs info that provides a ride height specification that is independent of tire size:
06-12-2009, 12:35 AM
#9
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Stock is 24.6 to 25.2 depending on which brand tire you use. Tires with the same sidewall marking vary that much in size. So, figure about a 1/2" diameter variation tire-to-tire, which would change ride height 1/2 of that, or about 6-7mm.
06-12-2009, 01:53 AM
#11
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Illl make it real simple. fender, just over the tire in the rear, 1-2 fingers space in the front, no more.
Right now from the picture, the front could be a little lower.
mk
Right now from the picture, the front could be a little lower.
mk
06-12-2009, 11:16 AM
#12
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Offset makes no difference. Offset only moves the wheel/tire mount point horizontally under static conditions - the vertical component of the attachment face is always the same.
Alan
Alan
06-12-2009, 11:49 AM
#13
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I dont know about you guys, but the stock US levels are lame. it looks funny. Unless you live out in the country or in NY city, why would you want your car jacked up that high? the euro spec for most all cars is lower and NO car looks good with all that gap between the front fender and the tire. regardless of the tire,just use a 2 finger gap if you are conservative or 1 finger gap for sport and on the tire even for race/DE and careful driving. Look at Alan's GTS picture. this is how the 928 needs to look on the street. 
06-12-2009, 12:03 PM
#14
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When I installed 18"s I went with tires that maintained the centerpoint of the hubs and set the ride height to stock,within tolerances of course. I've also done Koni's and hypercoils.
Front 245/40 18
Rear 275/35 18
Kumho Exsta XS
Front 245/40 18
Rear 275/35 18
Kumho Exsta XS
06-12-2009, 12:07 PM
#15
Owns the Streets
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I dont know about you guys, but the stock US levels are lame. it looks funny. Unless you live out in the country or in NY city, why would you want your car jacked up that high? the euro spec for most all cars is lower and NO car looks good with all that gap between the front fender and the tire. regardless of the tire,just use a 2 finger gap if you are conservative or 1 finger gap for sport and on the tire even for race/DE and careful driving. Look at Alan's GTS picture. this is how the 928 needs to look on the street.
Why aren't you driving a pimped out Nismo?
Guess it's fashionable these days to have the A-arms canted up when static.
So when they depress the A-arms goes further from horizontal.