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 Post subject: Front coil springs
PostPosted: Thu Jan 14, 2021 12:43 am 
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Joined: Fri Oct 23, 2020 1:47 pm
Posts: 7
Model: 924
Hi guys,

As a newbie I have a question which I am sure you guys will know instantly with all the experience on here!

I’m looking to swap out some front lowering springs on a 86 924S for some original coils and wondered if the 2.5 8v 944 shared the exact same part/fitment?

Many thanks, James.


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 Post subject: Re: Front coil springs
PostPosted: Thu Jan 14, 2021 11:11 am 
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Joined: Mon May 18, 2015 7:53 pm
Posts: 2435
Location: Bournville - Land of Chocolate
Model: 924S
Many will say that they are the same. They are interchangeable but the rates are slightly different. The early offset 944 had a rate of 140 lb/in whereas the 924S had a rate of 125 lb/in (officially quoted as 21.8 N/mm). Pretty much all that you see advertised will be 140 lb/in and listed as fitting both models. Personally I think the slightly stiffer rate is preferable

*The above is based on the standard (non MO30) chassis*

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1985 924S Historic Road Rally / Hillclimb Car


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 Post subject: Re: Front coil springs
PostPosted: Thu Jan 14, 2021 11:33 am 
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Joined: Sat Feb 16, 2013 7:44 pm
Posts: 406
Location: Somerset
Model: 924S
I was looking at changing the front springs on my 924S a while back. I did a comparison of the PET data, screenshot below. Apologies it is not that clear but it is a screengrab of screengrabs.


Attachments:
924S and 944 springs.png
924S and 944 springs.png [ 79.24 KiB | Viewed 720 times ]

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 Post subject: Re: Front coil springs
PostPosted: Thu Jan 14, 2021 12:39 pm 
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Location: Bournville - Land of Chocolate
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Confusing isn't it James. Maybe the 944 and 924S had 125 lb/in springs (which is what my book suggests), in which case I don't know where the frequently quoted 140 figure comes from. It would make sense for the 944 to have higher spring rates with the extra wheel offset

Anyway, from a fitting perspective they are the same because the struts are the same

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 Post subject: Re: Front coil springs
PostPosted: Thu Jan 14, 2021 1:27 pm 
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Joined: Fri Oct 23, 2020 1:47 pm
Posts: 7
Model: 924
Thanks for the replies!

Yes bit confusing! There are some 924 Turbo coils also available on fleabay which could be a possible fit.

Found an interesting article here on clarks-garage /shop-manual/susp-15 (sorry wont let me post full site) which shows different spring rates for front and back, back being for the torsion bar of course. The 86 944 and 924S share the same figures but annoyingly they change the force to Newtons with the springs on the car rather than off so you cant compare them with all previous 924's.

Thoughts on fitting 924 Turbo springs vs 8v 944 springs? Cant seem to find any springs taken off a 924S for the similar £30.

Cheers James.


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 Post subject: Re: Front coil springs
PostPosted: Thu Jan 14, 2021 1:29 pm 
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Model: 924
Tell a lie here is the link: http://www.clarks-garage.com/shop-manual/susp-15.htm


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 Post subject: Re: Front coil springs
PostPosted: Sat Jan 16, 2021 11:20 am 
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Joined: Fri Nov 22, 2013 1:23 pm
Posts: 2199
Location: Atherstone
Model: 924 na
I still find it hard to believe that the heaver 924/944 would be on softer springs than the eairler cars

model weight spring
924na 1080-1130kg 140lbs
924 turbo 1180kg 140 + 160lbs
924s 1195kg 2946N
944 1180-1330kg 160lbs + 2946N

and the blue spring in Tony's post covers the 160lbs spec for the early 944 and and the 2946N for the 924S/944 85on

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 Post subject: Re: Front coil springs
PostPosted: Sat Jan 16, 2021 11:50 am 
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Location: Bournville - Land of Chocolate
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rallyimp wrote:
I still find it hard to believe that the heaver 924/944 would be on softer springs than the eairler cars

model weight spring
924na 1080-1130kg 140lbs
924 turbo 1180kg 140 + 160lbs
924s 1195kg 2946N
944 1180-1330kg 160lbs + 2946N

and the blue spring in Tony's post covers the 160lbs spec for the early 944 and and the 2946N for the 924S/944 85on

Yes it does seem hard to believe.
The 2946N is misleading. It is the force exerted to compress the spring to 251mm. The actual spring rate is 21.8 N/mm (125 lb/in)

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 Post subject: Re: Front coil springs
PostPosted: Sat Jan 16, 2021 2:59 pm 
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Model: 924 2.0LUX
Nige wrote:
The 2946N is misleading. It is the force exerted to compress the spring to 381mm. The actual spring rate is 21.8 N/mm (125 lb/in)



What's the relevance of the 381mm?


Perhaps Porsche just considered it was a more pleasant driving experience to have thicker sway bars and softer springs for less body roll and more compliance on bumps.

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 Post subject: Re: Front coil springs
PostPosted: Sat Jan 16, 2021 4:30 pm 
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Location: Bournville - Land of Chocolate
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Tam Wonderful wrote:
Nige wrote:
The 2946N is misleading. It is the force exerted to compress the spring to 381mm. The actual spring rate is 21.8 N/mm (125 lb/in)



What's the relevance of the 381mm?

My mistake - 381mm is the free length, the compressed length is 251mm (post above edited). I assume it's the anticipated ride height length

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