I thought that I would keep this thread going rather than hijack Simon's IPRA Nationals thread as I have a number of questions to ask based on what has been written in that thread.
Following the ride height specs Tom has kindly given us I went about and did my best to get the SSS close to that. Given that my Kumho tyres appear to be around 9mm taller than Toms Hoosiers it was always going to be an uphill battle but I did get it fairly close, The upshot of that was after driving it 300 metres down the road and back it has just about ruined the top outer edge of the right rear tyre. The swaybar has hit the exhaust as it goes over the diff and the swaybar itself had to be disconnected to even drive out the garage as the links were seriously binding up as well as the arms hitting the diff tubes. All in all not a happening thing so the absolute best that I can get the back down to would be 135mm as measured from the body join below the sill ( allow another - 4.5mm for the tyre diameter difference between Toms Hoosiers and my Kumhos ) so that would make if roughly equivalent to 130mm. The front down to 125mm.
Given that the last race meeting I came away rather unhappy with the lap times and overall handling of the car and had it reported back to me that even though on the exit of the corners the car appeared to be sitting flat mid corner through the apex it was like 'a double decker bus'!
I had grand hopes that dropping it may have gone a long way towards curing this but to be honest any more than a 10mm drop and I will be playing with fire as far as rear guard clearance goes.
The thing that really puzzles me when I am driving it the car itself does not feel overall too bad and I can't really say yes its pushing terribly here or its loose as here- it just is not precise in the corners and does not seem to be carrying enough exit speed relative to other cars ( including a 1200 coupe that up to the last meeting have always had the edge on )
I had grand hopes that dropping it down may have gone a long way towards getting that mid corner body roll better but thats off the table now as I do not want to start massaging guards given the historic nature of the car.
This then raises the question what else can be done to limit that mid corner roll?
Harry made a comment to Simon re front RC being too high- is this because he had lifted his pick up points in the crossmember by 25mm or is it because of the 45mm roll center spacers?
Just to refresh my setup is 275lb front springs on adjustable B110 struts with Koni inserts, 20mm 3 position adjustable front bar ( currently set in the middle setting )approx 30mm roll center spacers, a whisker under 4 degrees negative camber and 4 degrees positive caster, 2mm toe out.
Rear is a beefed up copy of the John Taylor springs- interestingly still with a very small amount of curve in them, Group 2 Escort Bilsteins and an adjustable 16mm bar.
I haven't measured my track ( do you guys do it from inner to inner? ) but it is definitely wider in the front than the rear.
Are the roll center spacers a good thing? To be honest when I put them in I do not notice any difference whatsoever.
And just to add some more confusion given that my 2 main tracks are predominantly left hand corners and one in particular is renowned for give the right front tyre absolute hell the tyre wear is really good- nice and even across both the front tyres.
Would really appreciate some knowledgeable input here as I am really struggling on this one.
Cheers
Dave