norma wrote:Yes, fair points Rob!
By skittish, I mean at 60+ on B roads it floats about a bit and needs constant correction wheras it didn't before. In fact, I set the amount of toe-in originally as just enough to dial out the 'skitting' but not lose too much turning response.
But you have possibly hit the nail on the head as my front shocks only have 20-25mm of travel and I think they're probably not the best either! Intend to replace with shorter Protech ones that allow the shocks more travel but keep the same road height.
Will try this first before even thinking about spring lb's!
(My thoughts were though, that with an arb, both springs are working together and therefore, in effect, upping the effective poundage??)
YES ---- but only in transition of the diagonal weight . You mention instability at 60 mph plus ---- If you'd only given me that info alone , I'd check that the ' toe ' is definitely either straight ahead OR only just in , say 1/16 inch between the two wheels. Any toe out is not for the faint hearted unless hillclimbing specifically in the low gears . Then I'd look at how much '' trail '' (castor) you have

ie. TOP outer rocker centre bolt/nut --- is rearwards from the bottom outer wishbone bolt/nut

ARE they the same both sides
This can be improved by moving the bottom wishbone towards the radiator ----- cut a 1/4 inch or 1/8th inch from each front face of both inner pick-up points. You'll need to patch weld any small hole made into the tubes then cut/shave some material off the front end of the poly bush plus inner sleeve THEN pack washers behind the pick-up joint to hold the wishbone forward.
Mine's totally adjustable but I did it the above method the first time , years ago. Both the above trail and toe are very closely linked to high speed stability Alex. If you run TOYO R888's , I hope you keep them to 17psi on track and keep letting them down to 17psi before going out on a second session . They'll rise a minimum of 1.5psi and sometimes 3psi after plenty of laps.
BUT please remember to put them back when driving home , as they'll drop psi standing in the paddock chatting
When I check mine after motorsport the following day they are 12 to 15 psi
