Post by
Exar-Kun »
https://forums.nicoclub.com/exar-kun-u1725.html
Sat Jan 22, 2005 3:00 pm
How about you go actually educate yourself about suspension geometries before mouthing off?
You are correct there is no absoute "1 best setup" for everything but:
"and there is more than 1 way to actually have flush wheels on stretched tires with ridiculous low height with perfect streetability, no bump steer, aligned to whatever specs you want, contrary to what some people will tell you here. Now I remember why I haven’t been on this section in awhile."
no,..uh..no, and no.
Ideal frame height negates one point, suspension travel and grip ability associated with it negates a second, bump steer is a function of scrub radius angles between the tie rods and control arms, which increases with wider (lower offset) wheels..meaing that point is false,
And alignment specs affect all that, negating your last point. "perfect streetability" falls into a range of alignment settings for an intended purpose, at given constants (like suspension heights, travel, camber gain, roll center and amount of roll steer...)
How many people do you know that actually look at the measurements, just the lower control arms to reduce scrub radius by using a higher kingpin inclination (which leads to other problems) to get that "zero bump steer" and takes measurements and tie rod pivot point into account when they do it?
Only the guys that have professionally set up suspensions.
Case in point, excessive negative camber is used on race cars because they're compensating for a camber gain falling short in their suspensions on road courses, using race tires. Settings on this depend on spring rate, roll center, type of suspension, etc....Do you really think half the kids running -4* of camber on their cars take the time to consider that? NO.
They just run it "without a problem"...except there is, they just might not know it. You’re screwing with all kinds of things when you start going to extremes like that.
Anyways, if you're going to have such an attitude that "oh look X did it and he said it works" and dismiss the research and proven suspension theories then by all means, stay clear of this section. I'd rather not have miss-information and crap floating around like that.
If you understand -what- you’re doing to the car and -why-, do what you like. but I'd say you, and most other just see what someone does and not necessarily the why (other than they saw someone else do it, or it looks cool, or you take a point to an extreme, like lower cars handle better...because weight transfer is less....but you don't take time to learn about roll centers, frame heights and other things. so you slam them and think it handles better...same thing goes for spring rates)...
Now, as you said back on topic:
Spacers are bad for the following reasons:
-safety, this primarily applies to sandwich style spacers. Don’t use them; they compromise clamping force from the lug nuts-wheel-hub.-weight: they weigh more. Since when does more unsprung weight mean good?-Suspension geometries- they artificially reduce the offset of a wheel..
-increasing the scrub radius (thereby increasing the amount of twisting force fed into the spindle and steering on any bump or cornering force is experiences) -increasing hub stress and fatigue by moving the weight of the tire out (think about a lever arm)- decreasing the effective spring rate (called the wheel rate) by the same method (why you'd need to run higher spring rates to control it, leading to other problems if you don't run R compounds on smooth surfaces)-if only used at the front, they alter the front-to-rear track ratio designed by Nissan, creating tracking and handling imbalances due to effective wheel rate changes and other things.
There. Now you know. I can do into more detail if you want..but I doubt most people even read this far...
Thanks for listening, and I'm sure I just made about 20x more enemies on this board yet again.
-Chet
Also, my appolgies to Red_Coupe, and others liek Sky. I don't flame people until they do something like the above isntead of sit back and think. I appologise If I seem hostile to the rest. I'm just sick of mis-information and "see it must be ok" crap being spread around in my pressence for no good reason.