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My thoughts are he wishes to sit too high. Period. with only 2 inches shock travel to ride height the spring rates will be way too high and the ride willl always suffer badly. He needs to drop his ride height to whatever is required to allow approx 4" (at least 3+ inches)in shock at ride height. For what we do and where/how we ride there isn't really any need for 15" ride height. Then he needs to determine the primary spring rate that will support his corner weight at that ride height. Next step is to calculate the main and tender spring rates needed to support his car at that shock travel. That will get him in the correct spring rate ball park. Then and only then should there be any thought to valving.Let's just round his rear corner weight to 540 pounds and assume 4 inches of shock travel to ride height. That makes his primary spring rate needed to support car at ride height 540/4=135 pounds/inch. Rounded off that makes his main spring rate 340 and tender rate 225. Same scenario but with 3" shock travel to ride height. 540/3=180 primary rate. That requires main rate of450 and tender rate of 300. Bottom line is that the higher the dual rate used will make the ride just that more harsh unnecessarily.
Quote from: fabr on April 13, 2022, 06:24:06 PMMy thoughts are he wishes to sit too high. Period. with only 2 inches shock travel to ride height the spring rates will be way too high and the ride willl always suffer badly. He needs to drop his ride height to whatever is required to allow approx 4" (at least 3+ inches)in shock at ride height. For what we do and where/how we ride there isn't really any need for 15" ride height. Then he needs to determine the primary spring rate that will support his corner weight at that ride height. Next step is to calculate the main and tender spring rates needed to support his car at that shock travel. That will get him in the correct spring rate ball park. Then and only then should there be any thought to valving.Let's just round his rear corner weight to 540 pounds and assume 4 inches of shock travel to ride height. That makes his primary spring rate needed to support car at ride height 540/4=135 pounds/inch. Rounded off that makes his main spring rate 340 and tender rate 225. Same scenario but with 3" shock travel to ride height. 540/3=180 primary rate. That requires main rate of450 and tender rate of 300. Bottom line is that the higher the dual rate used will make the ride just that more harsh unnecessarily.why 540 lbs? his chart looked like 670 lbs.basically your saying 30%droop at ride height for a better ride?i completly agree that 300/450 is too stiff for what we do/how we ride.
Understood. Accutunes numbers of 300/400 were with 4" to ride height, I thought, but could have misunderstood. At 2" to ride height, the numbers were EXTREME! They figured both being 16" long, compared to my current 16"/18". Fabr, does your calculations include spring length? Sprung weight is 543.