Is there some sort of correlation between the two? Some kind of relativity that can be used to get the fender gap you want w/o the guess work?

Something to the tune of, if I lower my suspension 1" it equals .5" at the fender...

This way I could set my coilvers at the height I want them to sit on the car without adjusting them 10 times. I know I'm probably just being lazy but if I could make some math equations do the work for me why not?

 

No real math equation for that. Some approximations are out there though.

The biggest issue is that tire size, and wear and tear on the fender over time, change the fender gap. The proper way to measure ride height is to use something fixed (unlike an easy to bend fender), such as the side jack points.

 

If I measure with the rims and tires I'm going to be using I should be ok. I don't understand the wear and tear of a fender though, I've never heard of fenders wearing. It doesn't matter though, I'd like to keep it as simple as possible and the jacking points aren't a comfortable place to measure for me. It so much easier for me to go from the center cap to the fender, if the dimensions of the fender changes for whatever reason I'd have to just take that into account.

Would you know what the approximations are by any chance?

I just don't want to set the height, check the height, set the height and check the height 10 times. I may have to but if I can avoid it that would be so much better.

I think it's 1" at the coilover equals .5" at the fender or it's the other way around which is what I'm not sure about... I remember reading it or seeing it somewhere just can't remember...

 

why don't you use a fixed point as was mentioned and correlate it to the fender/ tire gap

 

Fenders don't "wear" per say, but I'll wager that after parking lot taps, parallel parking rubs, and everything else that has happened over the 80k miles and 9 years of my car's life, the fender's probably are not as symmetric, or in the same place, today as when the car rolled off the showroom floor. And if you've rolled or pulled your fenders (or both), then they definitely aren't going to be the same.

That's what most of us end up doing. That's just part of the joy of running a threaded spring perch. Though, I only adjusted mine twice after the initial install to get the desired height.

It's based off the car's motion ratio, so it depends on the car being discussed.

The shock always moves less than the tire (even a strut doesn't have a 1:1 motion ratio, just very close), so it is a greater change in ride height than the change in spring perch height.

 

I'm just being lazy.

I'll keep this in mind:

and try to test my theory of .5" spring height change equals 1" at the fender and see what happends.

Thanks

 

I guessed the first time and I liked it, it was an even gap all around.

 

i think this will also depend on the type of coilover being used. ive noticed that full coilovers with seperate preload perches (omnipower for example) have about 1:1 ratio of coilover to fender change. sleeve type coilovers may be different since the spring compression and preload is changing each time.