relativity - as in fluctuation of main spring rates, the helper reflects it.
ie.
harder spring rate - harder helper.
for circuit racing, the tender spring pound rating should be about 20% of the main spring weight.
explain relative.
if its the same rate as your spring it will essentially just make your spring longer.
if its softer than the spring it will compress first with the shock and then the spring will compress.
this will give the shock the amount of stroke it needs.
essentially it will give an effect like a progressive rate spring.
i feel we need to open a new topic of progressive spring rates vs fixed spring rates vs fixed spring rates + helper springs
relativity - as in fluctuation of main spring rates, the helper reflects it.
ie.
harder spring rate - harder helper.
for circuit racing, the tender spring pound rating should be about 20% of the main spring weight.
Bit late, but if the spring rate K of Helper is 20% of 8kg/mm spring = 1.6kg/mm that's still 90lbs seems high (like OEM spring rate in 86). Or did you mean if the Main spring weighs 5kg the Helper should be 1kg?
Helpers are rectangular cross section wire too (while main spring is larger Ø round wire) as you want the coils on the helper spring to bind completely under the vehicles own weight (so it doesn't doesn't effect damping) and if the suspension is fully unloaded, they should extend to keep the spring captive (so enough K to counter the unsprung mass of the suspension).
Maybe you're thinking of a progressive spring rate? They show a similar effect as the coils bind (less active coils increase rate) the spring rate can go up by around 20%?
It was mentioned by both HSD/Stance were released after 2 years R&D. Interestingly the Greddy and DG-5 (Kei-Office before Ogura Racing Clutch took over) were released in 2007... so it took 2 years to reverse engineer them! lol scepticism aside, I'm still waiting to get an answer about the damping of the HSD units (compression/rebound figures) but after 2 years of R&D you'd think this is data that would be on hand. Afterall the dampers are more critical then the spring rates.
For those wanting installation pics there is a thorough thread here on also worth noting that they were originally twice as much as the Greddy ($3000 -$1500)
Last edited by Kid Karola; 29th January 2010 at 03:19 PM.
RokuSteady : Shakotan - Tsuraichi - Hippari - Onikyan : 神奈川 様式
6K Front and 4.5/4.7K rear is firm but not bone jarring uncomfortable in a street car. Strut braces will help reduce flex. +8/6K is more suitable to track and drift applications where roads are rutted with potholes.
Also I agree with Slyder in
RokuSteady : Shakotan - Tsuraichi - Hippari - Onikyan : 神奈川 様式