DIY Coilovers

ISG

Well-known user
May 30, 2013
122
17
Lithuania
Hi,

So I was not happy with the lowering springs, so decided to do myself a coilovers for the front end, I taught I will share it with You, maybe it will be interesting for some...

I bought a coilover kit: sleeves with threads, adjustment rings, and top cap - 60pounds on Ebay. I did a research and decided to get a 7 inch, 300LB springs - 40pounds on ebay. So in total it was about 100pounds.
Unfortunately almost all components had to be modified, and a lot of things had to be custom made by myself, because there are no bolt on kit for Cougar.

Struts:
Firstly I had to cut out original spring perches from the struts. You have to cut just above the weld line. You have to cut as straight as possible. I did this with a simple angle grinder.
Secondly You have to own a machine tool, because You will never cut that perch perfectly, so it is nice idea to machine a perfectly straight base for that sleeve to sit (or You can just grind everything down and just weld the sleeve to the strut). Also all sleeves on the ebay are 50 or 52 mm ID. You have to buy a 52mm sleeve. Strut OD is also 52mm+paint. So You have to grind all the paint down in order to put the sleeve on (also lube it good, this will also protect from rust, I used heavy duty gear lube thing, it is thick like butter and doesnt run).

Sleeves:
Sleeves are 152mm long. I had to shorten them so they would perfectly fit Monroe struts, and the top plastic cap could be put on and whole assembly would look like factory made.
I shortened them to 105mm.

Locking rings:
Locking rings were the only component that required NO modifications at all. I just made a hard rubber gaskets (top and bottom), so the spring would sit nicely.

Top spring cap:
All top spring caps come with 10mm pilot holes. I machined them to be 22mm, so it would be able to slide them onto the pistons. You have to machine them perfectly - You want that cap to be not too tight and not too loose, there should be no play, but it has to slide down on its weight.
Also the top side of the cap was not flat, I machined it to be perfectly flat. Explained next.

Custom made metal “huge washer-cap”:
I decided to use the original bearings, so I had to make those huge washers to make spring caps (that are now flat) sit on the original bearings. Because all top caps have too small OD. Hole is also 22mm. OD has to be made according to the OD of the original bearing. Also it is a good idea to place a gasket between the top cap ant this washer, so there is no metal on metal in the whole assembly.

Gaskets:
I made all the gaskets myself also. Used hardest rubber I found.


Springs:

I decided to try a 7inch/300lbs springs. If they will be to hard, and the ride too bouncy, Ill take 200, or 250lbs.

Bump stops:

Will cut them in half as the car will be lower that stock.

They are not tested Yet, I plan to put them in during the next week, as far as I think it should work OK, so I cant wait to try :)

PICTURES:
https://www.dropbox.com/sc/ow39yyl79yplh3j/AAA8L5RrgYsa_yvAjF3MOt_Wa


Thanks,
 
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I am absolutely stunned by this - it's an amazing piece of engineering and I hope it gives you what you need.

But I'm sorry, I do have to ask this...

Gaskets:
I made all the gaskets myself also. Used hardest rubber I found.

You live in the Baltics. Is the hardest rubber really what you want? What's the risk of this midwinter? What is the behaviour and wear profile in consistently below-zero temperatures?
 
Hi,
Funny You mentioned, because I made all gaskets from 3 different materials. (see pics). One is rubber: well its hardest I found, but actually its not that hard, its not as hard as plastic. But I decided not to use them, as i think they will collapse under the pressure in few months. So I fitted another material, I dont know how its called in English, but it is used in those water pipes that are underground, they are durable as hell, flexible, and hard at the same time, so I think they will do perfectly in this application. Hell... some good aftermarket coilovers dont even use gaskets at all, so ill be fine anyway :)
I just assembled the final version of the coilovers, they are going onto my car tomorrow, check the pics. Now they are slammed all the way down, I will adjust them from this position, as the corner weight of the car is about 900lbs (I think), and those are 300lbs springs, in theory they should compress 3inches. The tire should be inside the fender for 1cm, so I will have to get it a little higher. Well, it’ll be clear tomorrow...

PICTURES:
https://www.dropbox.com/sc/ow39yyl79yplh3j/AAA8L5RrgYsa_yvAjF3MOt_Wa

Thanks,
 
Hi, its been a long time :) Had a lot of things going on besides my Cougar, but finally found some spare time to finish those DIY coilovers for good.
When I mounted my DIY coilovers “VERSION 1” I found out that the whole top cap/bearing thing was way too massive, I taught that I could use that dead space more effectively, so I decided to modify whole top side of the assembly. So I cut/machined top strut/bearing mount in half, and fitted aftermarket thrust bearings instead of original ones.Also I had to machine custom washer to sit the bearing perfectly. In the pics You can see the difference between the stock massive construction vs mine. What I achieved with this VERSION 2 is the space used by the dead massive construction, is now used for the spring compression. That way I have low stance and quite comfortable ride. Now that the weather is extremely good, I drive my Cougar everyday for 3 weeks, and it feels awesome, no issues whatsoever. Anyway, now I figured out some more tricks how to modify the construction even more to lower a little more without sacrificing the comfort, (or stay on the same level but have more comfort) but that’s coming a little later this summer. See pics. https://www.dropbox.com/photos/album/U8Ucknf7Ya3QUn3

Thanks,