how much should you lower the fron for optimum handling? and how much the rear?

I have just fitted some spax adjustable coilovers and fitted them on the lowest setting - obviously too low. I have then wound up the seat 25mm - does anyone know what sort of drop this would equate to? I suppose the other way you could work it out approximately would be if someone knew what is the distance from top of wheel to the arch on a standard set up. (got 15'' cyclones on 195/55/15's)

I have eibach pro kits that are rated at 40mm drop with the rear on 19mm TB's dropped one spline.
The pro kits ended up very mildly lowering the front - no where near 40mm, more like 20mm.
So the car was sagging at the rear.
I ended up chopping a coil off the pro kits and that dropped it a further 15mm or so.
Without the rear seats the spaces between the tyre/wheel arch is perfectly even.

Measure the front and rear Jacking points (the small square cut out bits) to the floor. The rear should be 10-15mm (depends on tyre front & rear tyre wear). With even tyre wear 10mm ... if the fronts are lower then up to ~15mm. When You measure the ride height roll the car forward a little and take a second set of readings. You will then know if the surface is level. Even a 1mm road surface bump throws the readings out. You really need machine polish level concrete or a ramp to make an accurate reading.

Tweaking the car further depends how the car drives in and out of a corner. Adjust the rear higher (or front suspension lower) if you need more turn in. A more level rear to front setting will be better around high speed corners but gives under-steer in slower corners. As the rear is raised (or front lowered) the car will turn in better which is good for tight corners but the backend will roll more and get out of shape in high speed corners. Once the car is setup right it literally drives around corners. Suspension setup seems to be a bit of a compromise and comes down to the type of roads you drive. I am sure that someone can elaborate (and confirm) what I have said is correct (for standard suspension) ... There are some really good suspension threads in search.

even S16's here have 20mm too...

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