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Old 02-04-2010, 09:44 PM   #67
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Member#: 102984
Join Date: Dec 2005
Chapter/Region: MWSOC
Location: Northbrook, IL
2005 2.5RS 4EAT
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Originally Posted by Daishi00 View Post
I will disagree with bolded section significantly especially on a car that is street driven. My car is pretty damn comfortable to drive in and it's far from stock.

Stiffer springs aren't going to change the fact that you need droop.
If you count harder bushings- yeah to some extent you'll get increased NVH, but that really to me is NOT NVH, but increased tactile feedback. NVH has a negative connotation, and therefore I only consider NVH unnecessary harshness in a ride. (But that's just my definition)

But remember the biggest cause of NVH on cars is that the struts have been incorrectly matched to springs. So, if your "upgraded" suspension has created lots of NVH, chances are, your struts are incorrectly matched to your springs. Or the damping rates are incorrectly set.

Go-Karts have lots of NVH, but does that mean they have the ideal suspension? No. Now I would also say if you can't feel the road at all, and your ride is super soft, that wouldn't be good either. NVH levels should be at a decent medium where you are able to get tactile feedback from the car without the car being too harsh.

As for droop, how much droop you need is determined by lots of complicated freakin physics things that only Ty understands cause he's a Physics ninja master.
The roughness of the road is one factor, but there's more.
Stuff like body roll, that people try to foolishly get rid of without considering the factors super stiff springs (or in many cases, overly dampened struts) will do to the other parts of the car, is important.
Lowering and stiffening the car is NOT the answer to getting rid of body roll really. What it seems people have a quandary over is the fact that people want to get rid of body roll, and by connection have a snappier car without getting rid of suspension travel. With lowering and super stiff springs, you may lower the center of gravity, and you may have what feels like a stiffer ride, but in reality body roll has more factors than just center of gravity. Something called roll center is a most important factor when it comes to body roll. When you lower the car, you are lowering the roll center, thus making the problems of body roll WORSE, while the stiffer spring rates only mask the real problem. With all of these factors in mind, it is very difficult to get a "perfect setup," but getting close can be done where you can preserve droop and keep roll center high, thus allowing more suspension travel, less body roll, and even sometimes better camber curve. You get a snappier car without a super harsh ride, and you start living life again! Done with theorycrafting. I wish suspension work was as easy as writing stuff.
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Last edited by formula91; 02-04-2010 at 09:53 PM.
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