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%
Voters: 37. You may not vote on this poll
Simple ride height queastion and poll
06-15-2009, 11:30 AM
#46
Rennlist Member
I understand what you are saying, but you cant assume we are talking about a car that hasnt had an alignement as his/her 928 has sagged 1" over 20 years. 
we are talking making sure you have the toe set poperly, regardless of the condition of the springs. And, if you dont like the softness, (which i actually liked until I started DEing my car 15 years ago) get a new spring and shock package. Thats just common sense. Tire wear will not be accelerated for a lower car, that is just silly. (we are talking a 20mm difference than the stock setting, and as Bill pointed out, its still in spec). 10mm beyond that is not going to be much of a difference either. (i.e 150mm ride hight)
mk
we are talking making sure you have the toe set poperly, regardless of the condition of the springs. And, if you dont like the softness, (which i actually liked until I started DEing my car 15 years ago) get a new spring and shock package. Thats just common sense. Tire wear will not be accelerated for a lower car, that is just silly. (we are talking a 20mm difference than the stock setting, and as Bill pointed out, its still in spec). 10mm beyond that is not going to be much of a difference either. (i.e 150mm ride hight)
mk
Sorry to get testy, but I think the point I am trying to make is being missed:
On a stock suspension 928 (=mush, 20 year old shocks and sagged springs) a low ride height will eat tires (depending on how hard you drive) and leaves you more at risk for damage from ground contact- whether it's driveways, pot holes, manhole covers or whatever.
Every 928 I have seen (owned by the typical non-rennlist enthusiast) is low from springs sagging and has never been cranked back up, just re-aligned.
I am not going to get in a debate about this, it's been discussed to death and the search function should bring up enough information to choke a horse.
As far as my car, that pic is from '07, and my suspension is not stock. I don't have the same risk of grounding out and don't have much suspension movement either. Once my toe is set, I'm good. My car does not apply to what I'm saying.
On a stock suspension 928 (=mush, 20 year old shocks and sagged springs) a low ride height will eat tires (depending on how hard you drive) and leaves you more at risk for damage from ground contact- whether it's driveways, pot holes, manhole covers or whatever.
Every 928 I have seen (owned by the typical non-rennlist enthusiast) is low from springs sagging and has never been cranked back up, just re-aligned.
I am not going to get in a debate about this, it's been discussed to death and the search function should bring up enough information to choke a horse.
As far as my car, that pic is from '07, and my suspension is not stock. I don't have the same risk of grounding out and don't have much suspension movement either. Once my toe is set, I'm good. My car does not apply to what I'm saying.
06-15-2009, 05:31 PM
#48
Rennlist Member
If the guy was burning the inside edges, it was due to too much toe out because the car was NOT aligned correctly. we all figured this out in the early 90s it was do to alignment shops raising and lowering the car and then adjusting. I was a leader in that crusade!
Also incorrect, is weight transfer not happening with rear braking. weight transfer has nothing to do with rear braking, and has everything to do with wheel base, Cg hight and g loading.
ANOTHER error, the exacerbated camber is not a problem but a solution to tire wear as when you have a lightly spung (stock ) street car and you drive at the limits, you get body roll. this means the tires would be on their edges. (and normally burn up edges on the outside) instead, our "problem" is actually a solution, where as the body rolls, even more camber can be induced to keep the tire flat. It is VERY unlikely that the roll generated from a street car can induce so much camber as to wear out the inside edge of the tire. What chews up the inside edge, plane and simple, is too much toe out. Under braking this can happen, but it has to be some pretty strong breaking to wear the tires on the inside edges. Its also the reason for the slight negative camber to begin with. Ive seen issues at 1/8" toe out with accelerated wear, but solved with 1/16" toe in (about 5. degrees) . I can see the results of these changes very quickly, on the street and on the track due to the soft compounds I use always!
All you need to do, is find the data that Devek posted a long time ago on bump steer. the differnce between 10mm and 20mm lower ride hight is so small its not a factor.
Trust me, Ive driven enough miles street and otherwise to know that ride hight, sligtly off the factory specs is not a problem for the 928, even with exppensive street tires. my tire ALWAYS burn even from edge to edge. So does scots. Im at 110mm front ride hight and he is near 130mm
Again, Bill has been running 160mm, (still in spec) for a long time with no issues. what more do you want as far as proof?
Also incorrect, is weight transfer not happening with rear braking. weight transfer has nothing to do with rear braking, and has everything to do with wheel base, Cg hight and g loading.
ANOTHER error, the exacerbated camber is not a problem but a solution to tire wear as when you have a lightly spung (stock ) street car and you drive at the limits, you get body roll. this means the tires would be on their edges. (and normally burn up edges on the outside) instead, our "problem" is actually a solution, where as the body rolls, even more camber can be induced to keep the tire flat. It is VERY unlikely that the roll generated from a street car can induce so much camber as to wear out the inside edge of the tire. What chews up the inside edge, plane and simple, is too much toe out. Under braking this can happen, but it has to be some pretty strong breaking to wear the tires on the inside edges. Its also the reason for the slight negative camber to begin with. Ive seen issues at 1/8" toe out with accelerated wear, but solved with 1/16" toe in (about 5. degrees) . I can see the results of these changes very quickly, on the street and on the track due to the soft compounds I use always!
All you need to do, is find the data that Devek posted a long time ago on bump steer. the differnce between 10mm and 20mm lower ride hight is so small its not a factor.
Trust me, Ive driven enough miles street and otherwise to know that ride hight, sligtly off the factory specs is not a problem for the 928, even with exppensive street tires. my tire ALWAYS burn even from edge to edge. So does scots. Im at 110mm front ride hight and he is near 130mm
Again, Bill has been running 160mm, (still in spec) for a long time with no issues. what more do you want as far as proof?
Last edited by mark kibort; 06-15-2009 at 10:28 PM.
06-15-2009, 09:18 PM
#49
Race Car
Thread Starter
Join Date: Sep 2007
Location: No where Oklahoma AKA "The Dust Bowl" In The Arm pit Of Hell
Posts: 3,663
Likes: 0
Received 0 Likes
on
0 Posts
928andRC51 what's your first name? Great article. I did the stiffer springs so I guess I'm on the right track
