OK guys, This time I'm really going to fix it!!!!
The car is a 1997 2.0 TS sportpak with 16" speedlines and Koni adjustables all round and has been lowered about 40mm. She,s had a pampered life and covered 68k miles......I've had a good tug on all suspension bits and cannot find anything obvious - tyres don't have any unusual wear patterns - no accident history - drives true and square (although does like to follow truck tracks on the slow lane of the motorway) and handles fantastically around the back roads.
So, problem is 75 - 82mph vibration through the steering...feels just like out of balance wheels. You don't seem to be able to drive through the vibration once it's started...unlike normal wheel wobble.
Wheels have been changed (3 sets tried), tyres have been changed (new Pirelli P Zero Neros)
New wishbones and drop links fitted
Wheels/ Tyres balance and checked for true- all ok..current wheels swapped front to back - no difference
Alignment has been reset (three times)
O/S/F driveshaft inner CV boot was torn - so DS removed and CV dismantled, cleaned/Checked/Regreased and reassembled with a new boot.
Still no better....next it's a spend fest.....
Top mount bearings have been purchased (although I've not bought the mounts...should I also change these?)
Sparco strutbrace bought ready to fit
Current thoughts on what else to change:-
Track rod ends
All 4 CV joints
Front wheel bearings
Rear suspension arm pivots
Brake pads (as a service item and whilst I check the brakes for binding)
Replacement braided brake hoses (look like the originals are still fitted)
There's also the opportunity to replace the std ARB's with Whiteline upgraded bars (at about £200) - does anyone have any views
Also is there a camber adjustment kit for the front wheels?
Is there anything else I should/could check/change...this is driving me nuts and spoiling what is otherwise a great car
PS I'm going to post the same on 155.org