I have 18" alloys on my GTV and I want to lower it with new shocks and springs. Im thinking Koni shocks and eibach springs to give it about a 30mm drop.
I spoke to a guy locally who had his lowered by about the same with 17's and it was rubbing on the inner arch.
Would it be possible to cut out the inner arch and move it up a bit to give clearance for the wheels?
Not in my opinion.
It was actually the thread about 'why is the GTV so heavy' that got me thinking.
There was a pic on there of a GTV with the rear wings cut out and it seemed like it might be possible
I think possibly you've mistaken the picture?
I've been informed in the past that its not a good idea to lower the GTV as it causes the suspension to wear out.
It should not rub on the inner arch..... Yes it rubbed in the back and it was undrivable because of that (especially with a passenger) but that was with eibach + standard shocks.
Turned out the shocks were completely worn out.
Put koni shocks in and there is no rubbing even with a passenger and some luggage.
This is with 17 ich rims though but the diameter should be the same with 18 inch wich i will switch to next summer.
18" wheel & tyre has a slightly larger overall circumference/diameter.
There are all sorts of problems to overcome depending on wheel offset(ET), tyre width & bump stops!?
I've got 18s on the Cup-a-like which is lowered but the wheels have an offset of ET40, fronts are spaced 16mm but the backs rubbed when spaced the same, no spacers = no rubbing.(At the moment it's not got the arch liners fitted but I think it's safe now to have them refitted).
I also have 18s, ET30, on a V6 Spider with std springs & new shocks. Rear used to rub because the bump stops were broken. New bump stops fitted but the car now sits on them so the rear springs must be weak.
18s not only have a larger 'rolling' radius(with 40s) but are also normally 8J so wider as well.
When lowering the V6s sit on the bump stops unless these are cut shorter or early TS ones are used.
Is yours a TS? What offset are your wheels?
The bigger the wheel(width & height), the shorter the spring, the shorter the bump stop, the closer the tyre gets to the arch.
17s no problems as long as your shocks are good but more importantly your bump stops are intact.
18s, IMO, are a bit 'hit & miss', no pun intended.
I've recently asked one lowering spring manufacturer some questions regarding rear spring difference between a TS & V6, plus bump stops & they haven't answered!