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Old 12-08-2021, 01:39 PM   #101
sloopy
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Please update us on what spring rates and lengths you decide on. I've gone down this exact path and have inadvertently ended up with oem diesel springs on the front of my car. I'm going to order Ben's coilover setup, but I want to spend some time looking into spring rates first. I have an oem 23mm sway bar up front and have been wondering if there is a good rule of thumb for choosing a front spring rate which would pair well with that. Then I guess once I've chosen a front spring rate, I would use the front spring rate to determine an appropriate rear spring rate.
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> drivetrain: m47ii, 4.10 gear, wavetrac lsd
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> rear suspension: bne spring perch, 150 lb/in spring, koni yellow shock, 19 mm bar, 32 mm wheel spacer
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Old 12-08-2021, 03:38 PM   #102
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Originally Posted by OldCarNewTricks View Post
Great, I've reached out to him. Looks like the next step is figuring out spring rate of my front springs, as that is what is required to figure out a match for the rear.
Or find a large force tester and measure the spring rate.
Do you live near a university? Maybe reach out to a faculty member and ask for some assistance...a Mechanical Engineering side project? I imagine a ME lab could mimic something like this: https://forums.tbforums.com/showpost...1&postcount=11
Just a thought.
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Old 12-08-2021, 04:45 PM   #103
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Originally Posted by sloopy View Post
Please update us on what spring rates and lengths you decide on. I've gone down this exact path and have inadvertently ended up with oem diesel springs on the front of my car. I'm going to order Ben's coilover setup, but I want to spend some time looking into spring rates first. I have an oem 23mm sway bar up front and have been wondering if there is a good rule of thumb for choosing a front spring rate which would pair well with that. Then I guess once I've chosen a front spring rate, I would use the front spring rate to determine an appropriate rear spring rate.
I will definitely post whatever I find out. Given the thickness of the front springs, they should be a fair bit more stiff than any of the factory options.

I've begun looking into and reading up on spring rate testing. Pretty soon I'll have a shop press in my garage, so I may build up my own crude tester. Either that, or I can send my springs to a material testing shop and have them figure it out for me.
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Old 12-08-2021, 07:41 PM   #104
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At a very large guess. I would say those front springs are something like 160lb springs. The usual comment years ago was that the GT springs were 30% stiffer than stock. So stock being around 125lb from what I recall. 125+37.5=157.5. So the GT springs are around that 160lb. range. That seems about the correct zone to me because the IPD lowering springs I have are just over 150lb springs and the GT springs and IPD lowering both seem about the same stiffness to my butt. With the GT springs actually feeling a bit stiffer to me.
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Old 12-09-2021, 01:32 PM   #105
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Nordicar does not have the spring rate. I've asked them to provide me with the manufacturer's contact information. I cannot find the manufacturer's website. They are called "Vantage," and that's all I know so far. I'll keep searching.
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Old 12-09-2021, 02:42 PM   #106
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The spring rate can be calculated.

https://www.thespringstore.com/sprin...alculator.html
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Old 12-09-2021, 02:57 PM   #107
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^

Even easier ...

http://www.pontiacracing.net/js_coil_spring_rate.htm
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Last edited by Redwood Chair; 12-09-2021 at 06:49 PM.. Reason: Coil springs not Valve springs.
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Old 12-09-2021, 04:25 PM   #108
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I found this one a day ago: https://suspensionsecrets.co.uk/how-...-spring-rates/

Only thing is that I don't know what material my springs are made of.
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Old 12-09-2021, 06:48 PM   #109
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Originally Posted by OldCarNewTricks View Post
I found this one a day ago: https://suspensionsecrets.co.uk/how-...-spring-rates/

Only thing is that I don't know what material my springs are made of.


Spring steel.

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Old 12-09-2021, 07:52 PM   #110
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Spring steel.

I meant more about 1095 as opposed to another spring steel type.

But I guess stainless spring steel is a thing, which I didn't know.

https://en.m.wikipedia.org/wiki/Spring_steel
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Old 12-09-2021, 09:39 PM   #111
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https://eibach.com/us/p-192-spring-rate-calculator.html

I used this calculator and ended up with 167 lbs/in.
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Old 12-10-2021, 08:56 PM   #112
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Vantage is actually a Nordicar brand, not the true manufacturer of the springs.

I found in small print on my springs "Pp Sweden 43415803." I think the springs are actually a professional parts sweden part. I'll contact them next.
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Old 12-13-2021, 11:58 AM   #113
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Originally Posted by OldCarNewTricks View Post
I found this one a day ago: https://suspensionsecrets.co.uk/how-...-spring-rates/

Only thing is that I don't know what material my springs are made of.
As long as you know they are steel, the alloy or heat treat won't affect the spring rate, only the durability of said spring.
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Old 12-13-2021, 10:03 PM   #114
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As long as you know they are steel, the alloy or heat treat won't affect the spring rate, only the durability of said spring.
Good to know! Thanks!

I'll message you back soon regarding the rears. I still haven't heard back from Pro Parts Sweden. So I may end up going off the estimate
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Old 12-14-2021, 04:21 PM   #115
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Just use your estimate or mine. That is the zone these springs were at because Volvo wasn't going to give you something full sporting stock on these cars. That was for you to buy the Rsport stuff over the parts counter.

I find the springs feel a little stiffer than the old style IPD lowering springs I had a long time ago. Which makes sense because the old set of IPD lowering springs I have stashed are 152lb springs. They were nice enough back then to give you little tags on each spring with the specs on it.
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Old 12-15-2021, 10:43 AM   #116
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Originally Posted by dl242gt View Post
Just use your estimate or mine. That is the zone these springs were at because Volvo wasn't going to give you something full sporting stock on these cars. That was for you to buy the Rsport stuff over the parts counter.

I find the springs feel a little stiffer than the old style IPD lowering springs I had a long time ago. Which makes sense because the old set of IPD lowering springs I have stashed are 152lb springs. They were nice enough back then to give you little tags on each spring with the specs on it.
I think you're probably right. Still nothing from PPS.
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Old 12-20-2021, 03:55 PM   #117
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Figured I'd keep trying to find the manufacturer's spec, but came up more confused. The manufacturer has the 43415803 listed on their site, which apparently superceded 72432606. Both parts are for a GLT Estate/Turbo?

However, even though the 43415803 is stamped on my springs, the ad has the wrong info for them listed for both part numbers. They have them listed as 13.5mm thick.

I've tried contacting PPS twice, and another seller. No responses. Not surprising, as I don't speak Swedish, and translations may make no sense?
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Old 01-04-2022, 07:52 AM   #118
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Have you gotten these onto the car yet? Real curious what the ride height is - I’m looking to do something 242GT-like but slightly lower on my 245 Turbo.
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Old 01-04-2022, 01:37 PM   #119
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Have you gotten these onto the car yet? Real curious what the ride height is - I’m looking to do something 242GT-like but slightly lower on my 245 Turbo.
I have not yet, but I will do soon. I tried ordering Bilstein HDs last Oct, but they're out of stock for who knows how long. So my current objective is finding strut inserts that will do the job. May just run Bilstein touring.
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