Progressive coilovers

Forum for Infiniti M35 and M45, and Nissan Fuga owners.
TDot
Posts: 1183
Joined: Mon Oct 03, 2011 12:59 pm
Car: 2008 M35X, Lakeshore Slate/Tan
Location: NY

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svard75 wrote:Bottom line, the reality on using coilovers is it will be a stiffer ride unless progressive springs are used. Ive always used springs with new shocks/struts and have been very happy with them. If you want a smoother feel use springs if you want that gokart feel along with the harshness go coilovers.
This is exactly what I was looking to find out. Progressive vs linear on coilovers is the cause of the harsh ride issue all my friends talk about. I thought that was something to look out for only on lowering springs. They could never explain it, they all simply said go with springs instead for a nicer ride...and they all have multiple experience with both. AFTER :facepalm: buying the tein springs I started analyzing the whole strut/spring/suspension make up and simply thought everyone was setting their car too low so they had to set the struts as stiff as possible, hence a rougher ride. If I got the coils, I would pretty much set it at the level the htech would drop to so I wouldn't have that problem. Now I see that height in conjunction with it being a linear springs makes the situation worse. I searched other places and saw others said the same thing about wanting progressive springs with the coilovers for ride reasons. I was on the fence about going to D2 for this reason until now. So now I guess I'll stay with my springs.

This leads me to create this thread. Why then is a "true" coilover so great if they come with linear springs? Why not get a coil/spring setup and swap out the springs for a different spring that is progressive? Or get the d2 and swap out the springs for progressive ones? Go to a company like this Summit where they specifically design springs for coils with customizable sizes. Wouldn't that solve all problems? Am I looking at it too simplistically? I wouldn't go this route now because I don't want to deal with the corrosion/rust issues here in NY (because I'm simply not going to add another thing to the list of things I have to maintain on this car), or the squeakyness that seems to pop up over time with coils; but I think it would be a good discussion and exercise for people really interested in coils that crave the progressive style.


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Ilya
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Joined: Fri Apr 23, 2010 11:20 pm
Car: 2011 M56x but I spend a lot of time on my 2015 Kawasaki Vulcan S. Former owner of a 2007 M35x. Also take care of my wife's 2016 QX60.
Location: Charlotte, NC
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As stated in the other thread...I have BC's set to the softest setting and only 2" or so drop (1-2 fingers between car and tire). I didn't notice a huge change in comfort...it's just as bouncy/soft as it was before the coilovers. The two benefits of the coils is: 1) better handling and 2) better aesthetics.

I'd do coils all day. Yes the maintenance sucks but I honestly have been slacking on mine...lol.

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svard75
Posts: 1564
Joined: Mon May 11, 2009 3:26 am
Car: 06 M35x
Location: Toronto, Ontario, Canada

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There are some very unique coilovers that have tender springs along with the linear springs. Eibach makes custom springs http://eibach.com/america/en/performanc ... er-springs

If you can convince them to make you a set for D2 coilovers I would jump on a set too. Remember the set with the tender not helper. The helper spring is simply a very loose rate spring that allows for the full extension when used on 4x4 jacked up cars so the main spring doesn't fall out of alignment and bind.


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