Area Representative marcos59 Posted February 1, 2016 Area Representative Share Posted February 1, 2016 I would like to change my Bilstein shocks with progressive springs for Protech shocks.I'm unsure about springs...keep 176/224lb/in progressive springs or go for 200lb/in linear: - Are progressive springs better? for touring? for track ? - Is 200lb/in linear is similar value of 174/226 progressive or I make a mistake ?Thanks for advices ! Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted February 1, 2016 Area Representative Share Posted February 1, 2016 Standard rear springs are very much softer. They're something like 110 - 130 - 200lbs/in, but not reaching the 200lbs/in part until the extreme of bump.Softer springs normally give a better ride, and better traction.I'd say that something like 130 or 150 would offer a reasonable compromise if using a linear rate spring. Link to comment Share on other sites More sharing options...
OliverSedlacek Posted February 2, 2016 Share Posted February 2, 2016 Progressive Vs Linear is a debate that will never be concluded. On a Seven you have the complication that the suspension ratio (ratio of suspension travel to spring travel) is fixed at the rear but falling at the front. Rising rate (progressive) springs can be used to compensate for a falling suspension ratio or it can help stop the suspension from hitting the bump stops. The drawback of progressive suspension is that the natural frequency of the suspension changes through its travel, but the damping doesn't. This makes tuning the handling on the dampers a bit of a compromise.My rule of thumb would be that progressive springs can be useful on the road where unexpected bumps and camber changes are the norm. On the track things are more predictable, and as handling balance becomes more important, linear springs are probably better. Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted February 2, 2016 Area Representative Share Posted February 2, 2016 And, Nicolas, your choice will be different on your21 to your Seven. Link to comment Share on other sites More sharing options...
Area Representative marcos59 Posted February 2, 2016 Author Area Representative Share Posted February 2, 2016 Thanks for answers.Yes forget to say it is for a 21 so this is probably why spring rate I found on service history are harder than for a 7 (21 is 100kg heavier ) Link to comment Share on other sites More sharing options...
jackb_ms Posted February 2, 2016 Share Posted February 2, 2016 NicolaI recently fitted some Eibach spring all round which made a large improvement on the handling on the carI should be able to dig out what I have if you want Jack Link to comment Share on other sites More sharing options...
Area Representative marcos59 Posted February 2, 2016 Author Area Representative Share Posted February 2, 2016 Hi Jack Yes always interesting to share values It is on a 7 or 21 ? Link to comment Share on other sites More sharing options...
Mrp Posted February 3, 2016 Share Posted February 3, 2016 Talk to Simon Rogers our resident suspension expert, he helped me.Mrp Link to comment Share on other sites More sharing options...
jackb_ms Posted February 4, 2016 Share Posted February 4, 2016 Hi Nicolas I only a a 21!I have a looked at the weend Jack Link to comment Share on other sites More sharing options...
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