Yes that's the one!
The key quote is from Stuart who had his car set up at Track Developments.....(his car is an e30 based Sportster)
"I took the Sportster to Track developments near Castle Combe. I still have standard springs in the back and Marlin supplied on front coilovers. He recommended the following after doing corner weights and a lot of measurements of the vehicle.
quote:Hi Again Stuart
I have managed to get some more info. At last I have found the formula I needed. Before I was transposing from Metric units and getting conflicting results.
Your choice is :- for comfort go with 250 Front and 260 rear. This would still be stiffer than a family saloon.
For a more sporting set up try 280 Front and 300 rear.
end:"
So I think your suggestion of 600lbs would be too hard. My Apex springs are 291lbs.
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