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Old 07-13-2017, 01:07 PM   #1
firefight
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Default How I did rear adjustable rear springs on a 240

Here is how I did rear adjustable rear;
Looking though different Volvo builds, I have seen how some people do it, try to get a standard 2.5" coilovers spring to work with the 5" upper spring perch. But this never seems to look right.
After doing some digging on different circle track sites I found an adapter plate that goes from the 2.5" spring perch to a 5" spring, I also found the rear VW mk4 spring perches bolts on like a Volvo. I was able to get 5" coilover springs from summit

First I removed the stock spring

Next I bolted on the VW adjustable spring perch


Next the spring adapter

Then I put in the spring, with the shock removed, there is plenty of room to toss the spring in with out compressing it.
Then I cut the bump stops


To prevent the suspension of going full droup and the shorter spring fall, and to not blow out stock shocks I had to run shorter shocks.
Most seem to go for a s10 front shock for the rears, but when I looked at the difference, between the stock and that recommended shock, the difference wasn't enough. I found that shocks from a c10 rwd fronts are shorter



Two things need to be changed on this shock, the upper mount eyelet is slight to big, KYB offers adapter sleeves for cheap

The thinnest one goes on the upper mount bolt


The lower sleeve is too short, so I swapped the lower bushing and sleeve


Those now can be installed.
Next I installed my DYI adjustable panhard bar and adjusted it to center the rear axle

Nothing but bad pics on that.

Here is a picture of the suspension with loaded

unloaded

The shocks don't let the axle go down enough to to let the the spring fall out, but I still have a good amount of suspension travel and feels nice and comfortable.
I still need to build adjustable torque rods and bring the wheels forward.
Here's before and after with both coilovers



Parts i used
-VW mk4 adjusters
http://www.esetuning.com/solo-werks-...1vw004-23.html
(these aren't the ones I used but same thing)
-Perch adapters
http://pitstopusa.com/i-12067617-all...r-adapter.html
-Springs
https://www.summitracing.com/parts/lan-h300/overview/
Shocks
part number listed above, as well as the adapter sleeves
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Last edited by firefight; 07-14-2017 at 12:55 PM..
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Old 07-13-2017, 01:58 PM   #2
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Subscribed for Future reference!

Thanks a lot! Nice work!
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Old 07-13-2017, 02:12 PM   #3
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Do you have the spring rate that you used along with damper spec? What was the intended purpose? Just to lower? As such... you were looking for lower and comfort yes?

Might help others out with reference if they know what spring/damper combo you used and what results it yielded for your car.

Do you have any info on what the adjustable range (actual heights) would be with these? Also... what wheel/tire combo size is that?
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Old 07-13-2017, 02:19 PM   #4
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Great thread! I really like the mostly bolt on solutions going on here.

Quote:
Originally Posted by firefight View Post
I still need to build adjustable torque rods and bring the wheels forward.
This is the wrong reason to install adjustable torque rods. In fact, if you actually use them for intended purpose (resetting pinion angle to factory specs) it would most likely move the rear wheels back even further.

Cutting and shortening the lower trailing arms is still the best way to deal with the rear wheels being out of center with the wells once lowered. BTDT
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Old 07-13-2017, 02:33 PM   #5
firefight
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Quote:
Originally Posted by EivlEvo View Post
Do you have the spring rate that you used along with damper spec? What was the intended purpose? Just to lower? As such... you were looking for lower and comfort yes?

Might help others out with reference if they know what spring/damper combo you used and what results it yielded for your car.

Do you have any info on what the adjustable range (actual heights) would be with these? Also... what wheel/tire combo size is that?

The springs I use where 300lbs/in because that is what I read that was recommended on a different thread.
springs where 8" tall.
https://www.summitracing.com/parts/lan-h300/overview/

the shocks specs I could find where only length compressed and extended. I physically compared those to new 240 ones, they felt slightly stiffer, but where not totally un-compressible by hand.
I imagine that if you wanted it stiffer you could got to the Gas-A-Just which are stiffer, or bilstines.
I wanted it to be low and comfortable, and didn't want to just cut my springs,

The picture I posted of car in the last picture shows the adjusters about 3/4" down, with a total adjustment of about 3" downward.

Wheels are 16x8 BMW bbs style 5s, with 25mm adapters. Tire size I don't know off hand, ill find out when I get home

Last edited by firefight; 07-13-2017 at 02:49 PM..
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Old 07-13-2017, 02:44 PM   #6
firefight
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Quote:
Originally Posted by Uncleknucklez View Post
Great thread! I really like the mostly bolt on solutions going on here.



This is the wrong reason to install adjustable torque rods. In fact, if you actually use them for intended purpose (resetting pinion angle to factory specs) it would most likely move the rear wheels back even further.

Cutting and shortening the lower trailing arms is still the best way to deal with the rear wheels being out of center with the wells once lowered. BTDT
Thanks that was the goal, to make it bolt on nicely and give the impression that it was meant to be that way.

Thanks for that info, Ill start doing some reading on shorting the trailing arms!
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Old 07-13-2017, 02:46 PM   #7
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Nicely done.
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Old 07-13-2017, 03:43 PM   #8
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These seem to be a similar cost,

https://www.kaplhenke.com/collection...ng-perch-mount
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Old 07-13-2017, 04:16 PM   #9
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^this guy is just a shill for Kerplunky LLC


https://www.kaplhenke.com/collection...ng-perch-mount


Is a good deal, its an even better deal with springs. Its like 280.
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Old 07-13-2017, 04:28 PM   #10
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I'm not trying to take away any business from Kaplehenke. I got my adjusters used for free, or else I would have gone their route.
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Old 07-13-2017, 04:55 PM   #11
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Looks good, solid info. If you find tire spec post that too.



Quote:
Originally Posted by firefight View Post
The springs I use where 300lbs/in because that is what I read that was recommended on a different thread.
springs where 8" tall.
https://www.summitracing.com/parts/lan-h300/overview/

the shocks specs I could find where only length compressed and extended. I physically compared those to new 240 ones, they felt slightly stiffer, but where not totally un-compressible by hand.
I imagine that if you wanted it stiffer you could got to the Gas-A-Just which are stiffer, or bilstines.
I wanted it to be low and comfortable, and didn't want to just cut my springs,

The picture I posted of car in the last picture shows the adjusters about 3/4" down, with a total adjustment of about 3" downward.

Wheels are 16x8 BMW bbs style 5s, with 25mm adapters. Tire size I don't know off hand, ill find out when I get home
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Old 07-13-2017, 10:59 PM   #12
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Ahh dookie KYBs! Hope they last longer than a month for you.
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Old 07-14-2017, 12:04 AM   #13
firefight
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Quote:
Originally Posted by EivlEvo View Post
Looks good, solid info. If you find tire spec post that too.
205/45
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Old 07-14-2017, 12:05 AM   #14
firefight
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Quote:
Originally Posted by ryan242v View Post
Ahh dookie KYBs! Hope they last longer than a month for you.
I believe they are lifetime warrantied
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Old 07-14-2017, 01:40 AM   #15
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This set up is not coilovers. Adjustable yes, and it looks nice.
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Old 07-14-2017, 02:18 AM   #16
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Good job and you were right on going to the 5" OD springs.
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Old 07-14-2017, 10:33 AM   #17
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Quote:
Originally Posted by John V, outside agitator View Post
Good job and you were right on going to the 5" OD springs.
Who are you, and what have you done with John V!
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Old 07-14-2017, 12:55 PM   #18
firefight
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Quote:
Originally Posted by PeaceEngineered View Post
This set up is not coilovers. Adjustable yes, and it looks nice.
oops, your correct. I edited the OP

Quote:
Originally Posted by John V, outside agitator View Post
Good job and you were right on going to the 5" OD springs.

Thanks!
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Old 07-14-2017, 01:03 PM   #19
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Perhaps a set of axle travel limiting straps would let your shocks last longer. Probably quite easy to fab up, as well.
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Old 07-21-2017, 08:25 AM   #20
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Looks great, what set up are you running on the front?
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Old 07-22-2017, 10:13 PM   #21
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Do you have a write up on the diy phanard rod? Please?
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Old 07-24-2017, 06:03 PM   #22
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Similar result, some logic & numbers, a few pictures:

http://forums.turbobricks.com/showth...5&#post3267655
http://forums.turbobricks.com/showth...81#post3286481
http://forums.turbobricks.com/showth...22#post3296622
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