Double Digressive or Linear Pistons

Original Air date: 4/30/2020
Double Digressive or Linear Pistons
Full Video: • ASP 009 April Instagra...
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[@jessehill3780]

I don’t speak for them but I believe what he means is they’re not running as much low speed compression. You can have two shocks with the exact same high speed compression and then raise the low speed compression threshold on one and that will make that shock digressive. The second one is typical for a track car or smooth surfaces where you’re trying to control body roll and only allowing suspension to move once it meets the threshold. Downside is every bump, crack and tar strip in the road that doesn’t meet the threshold is much harsher which is why off-road shocks are typically linear. After having a softer spring rate setup with digressive compression shocks in the past when I went shopping for coilovers on my next vehicle I stayed away from venders selling digressive setups as they just use it as a buzzword since it’s in racing everyone thinks they need it even though their city street are not paved like Leguna secca. So I bought ones with firmer rates and linear curves and been much happier. I don’t think Annex was out when I was shopping but going through their videos they seem more a no BS company and it sounds like he’s eluding to too much digression a bad thing for most applications. It can also lead to problems on the rebound end too on fast ripple bumps as the suspension will pack down and get firmer and firmer through each hit.

[@granthendricks1143]

Hey this is well said! There are some subtle differences between what we've experienced and what you commented but this is a good summary IMO. Thanks for helping out our followers!

[@jessehill3780]

@@granthendricks1143 no problem, I’d love to check out your facility sometime if you guys still allow.

[@TranceFur]

Why wouldn’t you want to blow off compression pressure during high piston speed events (such as hitting a manhole cover or bridge joints) with your street-focused coilovers? Been considering Annex coilovers, but the KW V3s I currently have are fairly linear, and I’m not exactly satisfied with the way they feel. I can soften up their low speed compression and rebound, but that doesn’t help when they’re still so crashy and harsh over sharp road imperfections.