Speedtoys

Seems to be a common set of questions, because how much on the nut is a 10mm rise or fall??

Well, I put this together to help. Requires Excel, has a handy macro to reset the values you wanna start over.

Right-Click to download the worksheet:
928 Height Adjustment Worksheet

Catorce

Wow dude, amazing work. Could have used this a few weeks ago!

Should be a sticky!!!

Captain_Slow

Agree, this should be a sticky or in the Rennlist DIY section. The pictures of what to turn, which direction for higher and lower, and the tool reference are very helpful, too.

Speedtoys

Thanks. Any suggestions to add to this, I will add to the downloadable document.

Any OS should be able to unzip this for you. Consult the googles.

Speedtoys

I was asked about if you measure on a grade..what about that?

Well, on a 2% grade, which is just over 2" of elevation difference between both ends (A lot for any flat-ish driveway or street) I got these values:Front Correction-0.40%Rear Correction0.55%Weight Lost To Gradient-2.9438

Gonna just assume losing 3lbs of the mass of the car at a 20" vertical CoG in a driveway when measuring chassis height...aint gonna matter.


Now, right to left curb weight and then adding driver weight might need some adjustment, but need corner scales next month to see how driver weight moves around.

If I sit in my car and add 62lbs to the drivers rear corner, that seems to mean 8.5mm of spring compression...I think...

Speedtoys

Im a looking at an updated formula to work out motion ratio.

if I look at these two dimensions, D1 and D2, on my S4, and I do a simple D1/D2, I get ~.8, as previously reported here on RL by others.

But if I use Koni's formula, (D1/D2)^2, I get a MR of ~3.5, which dramatically changed my front adjustment number. And those are the #s that I went with on collar adjustment yesterday while swapping shocks.

I will let this settle for a few days, and report back, and make any needed adjustments/observations.