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Valving chart for 2.0's http://www.foxracingshox.com/fox_tech_center/owners_manuals/20_SERIES_VALVING_SPECS.pdf
Valving changes will require shock removal,a vise is invaluable,shock disassembly and reassembly and replacing on vehicle. Realistically you'll see 20-30 minutes minimum per shock IMO. Yes nitrogen will have to be recharged. I know of no one that does shock work at LS. #5?
The chart goes in #5 increments. #30, #35, #40 If you were bottoming hard would you change by #20? I suppose that there would be no way to quantify it with different weights ratios etc.Can you post up where yours are at Fabr? I never saw when I got my shocks if they told what the factory setting was.It is probably also not linear. Like on my rear the shock will be connected directly to the wheel carrier. If someone else had their shock mounted at 75% of their trailing arm length. Would that ratio get you close?
And how big of a difference is #5 gonna make?
I started with 30-90, then changed my rebound on my Fox Airs 2.0 from 90 to 65, and didn't feel it, but that was with a month between the before and after rides. I've always said I don't have that sensitive of "seat of the pants", though. If you were at the dunes, then did the change there, I still doubt you'd feel a change of 5. I would do changes of 20, myself.Ideally, I'd pull into the pits and have a crew bolt on a different set of shocks already set up with the new valving without getting out of the buggy. Then I figure I'd have the best chance to feel the difference. The other thing about revalving at the dunes would be keeping sand out of the process. Draining and refilling the oil, as well as all the oily parts, presents a lot of oportunity to pick up contaminants.