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1G Dual spring rate coilovers

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tektic

10+ Year Contributor
96
7
Oct 10, 2010
ronkonkoma, New_York
I just installed 180mm 8k/6k springs on my fwd 1g. I like that It handles great, but the comfort is not there. I want to add 5k or 6k Swift tender Springs to the front . I can’t find any example of someone doing this.

with the 8k (450lbs) spring in tandem the Initial rate would be 172lbs with the 5k or 192lbs with a 6k spring for the first 72mm before the spring binds.

both values are more than stock rates. I’m not sure which to choose. I’m leaning towards the 5k option because I’d end up at coil bind and second spring rate sooner. 4K is an option too. Initial rate would be 149lbs. That’s pretty close to stock rate.

has anyone tried this setup?
 
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What brand are the dampers? Some are so mismatched that they won't be comfortable, no matter what spring rate you have on them.
 
So I did a little more calculating and if the corner sprung weight is 800lbs:
8k spring will depress 45.7mm
6k spring will depress 57.14mm
5k spring will depress 68.57mm

the tender springs are only 72mm total. So a 5k spring seems too light to be any effect at all.

I need to check my current damper travel and see if my preload accounts for the proper 1/3 Shock Travel for droop as recommended. I set preload to 5mm without checking this. I’ve read this could be my whole issue.
 
I run a different suggested rate for my awd. 10k f. 8k rear.

I literally hit my head on the ceiling before the change it was so stiff.

So you were running 10k/8k front rear.This topic is about a dual spring setup (main/tender) on the same Coilover. Is that what you switched to? I’m sorry you hit your head.
 
If your dampers are that old, they could use a rebuild, which will probably help a lot with the comfort

This is what you're looking for. Make sure you have adequate stroke in your damper to accommodate for the increased body roll of these springs.

https://www.hypercoils.com/dual-rate-springs/
They were never used. Looked brand new when installing. Nothing wrong with the damper. the roads suck and the springs are hard.

I’ve looked at these springs. They are not really the right size though @ 12” long and 2.55” wide. I’d consider them, but how would they be different from Just adding the 60mm x 72mm 6k springs that fit better?
 
Ohlin's are really premium dampers & they were probably valved to a specific spring rates for their intended use. I think you may get some good help by contacting Ohlin and sharing your situation with them & see what they have to say.
 
They were never used. Looked brand new when installing. Nothing wrong with the damper. the roads suck and the springs are hard.

I’ve looked at these springs. They are not really the right size though @ 12” long and 2.55” wide. I’d consider them, but how would they be different from Just adding the 60mm x 72mm 6k springs that fit better?

Nothing besides just not having to use a separate spring seat and isolator. Definitely figure out your preload and get back with us. Eighteen years is a long time for shock fluid to sit, even in a semi-sealed coilover. If you can't get them to ride well, I'd definitely consider contacting Ohlin's to see if you can have them refreshed.
 
If they are Ohlins dampers from an Evo and made around 2002, they are the PCV model. These were only built in Japan under license and can't be rebuilt in North America. They're pretty much obsolete for service now. Even modern DFVs have a service interval of roughly 20,000 miles - I've seen many that looked brand new, but were already due for a service. Having 18-year-old oil in your dampers sounds really ominous.

With that said, I'm really confused about this setup. Evos have different suspensions vs. DSMs. How did you install these?
 
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I imagine he got something like this:

https://supercar-engineering.com/sc2/product_info.php?products_id=288

That being said, what is the point of the car? If you run softer springs you'll be inducing more body roll etc. Usually cars set up like this don't handle too well as the transition can be rough. I would say you're probably better off just getting softer full springs and swaping them out when you get to the track. A progressive spring is usually rising rate as opposed to two discrete rates which works a little better.
 
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