I drilled out the bottom of the strut as I noticed the stop in the tube was a fare way up... then I machined a new stop about 15mm deeper. This gave me about 25mm lower in the suspension with the same travel.

I then cut the tube bellow the thread at the top and shortened it accordingly then fitted the coil-over kit. I also stiffened up the steering arm after I cut most of it away to get a little more length for the spring.

Front Strut Bottom

Front Strut

Rear Coilovers

Rear:

Rear Coil-over


Bottom Mount

Having my Bilstein Rally shocks I decided to build my coil-overs myself. I bought the threaded tube from King Springs and made the rest myself before ordering these coils specially made.

The shock body is 50mm which is a little large... thus I had to make the rest my self with Kings making me a special 51mm I/S dia spring. This is to fit it all under the guard and it is a tight squeese with the top mount and is offest in the top mount hole.

At the bottom I am using a collor over the threaded adjustment as the spring doesnt fit over the thread. This works fine I just need to make a nicer looking locking nut setup.

I stiffened up the mount on the rear arm as well.

Bilstein Shocks:

Front Bilstein P36-0303 (Holden Commodore Modified) This has yet to be verified and my do soon.
Rear Bilstein B46-0180 (Porsche 911 RR Rally Unmodified)

King Springs:

Front Coil Over:
KPS-186-200LB
Free length – 300mm
I.d – 65mm
Rate – 200Lb/in
Solid Ht - 113mm

Rear Coil Over:
Custom Made
Free length – 450mm
I.d – 52mm
Wire – 11.5mm
Rate – 200Lb/in
Solid Ht - 230mm

Car Measurements

Front End Geometry:

Electric Power Steering:

Electric PSU

Vauxhall/Opel/Holden Astra Electric Power Steering Unit with a Holden Camira power steering rack
which is 3.3 turns lock to lock.

Wiring:

   Brown (6mm Wire) - Earth or Negative Battery Terminal
   Red (6mm Wire) - Power 12v Positive Battery Terminal 50Amp Fuse
   Brown/White - not used (some models don't have this wire)
   Blue/White - Power 12v Positive Battery Terminal 10Amp Fuse
   Black - Ignition on/off 10Amp Fuse

The Black wire I ran through a switch on the dash to isolate the EPSU when having the
Ignition "On" while working on the car or connected to the ECU with the engine off.