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I have a 91 Tspark with a broken front spring and therefore need to replace both front springs. what I am wondering is should I just replace the front springs with standard replacements or place all four with uprated and lowered?
I quite like the idea of uprated springs but dont want to make the car too low. Eibach do springs that are 35mm lower springs - although this is compared to a standard car on new springs so what in reality would be the differance in ride height to my 12 year old springs? I remember from my days with Escort's and Capri's people buying -25mm springs and the cars sitting higher due to higher poundage and newness.
would be gratefull for any comments

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I would have thought that the Escort / Capri analogy is all about poundage rather than age. Do springs lose an inch over their life? Because they have to take so many compressions without fatiguing, they should be operating massively away from their plastic deformation limit. Any thoughts anyone?
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Depends on how much standard ones cost.You can get a set of 4 uprated ones that will lower the car by around 30mm for about 120.You will not really notice 30mm too much to look at-it certainly wont be slammed-get yer ruler out and see-it's just over an inch.They will stiffen the car up a bit though.I have lowered mine and the old springs had not sagged as mine was lower upon fitment of new ones.As to Mave's post, there is no such terminology as 'plastic deformation limit' as car suspension springs are made from steel NOT plastic!
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Greg, just to clarify my thoughts; I know the springs aren't made of plastic, but steels behave elastically up to a stress, and plastically thereafter. If you get into the plastic regime, when you take the load off you'll have a permanent deformation. If you want something to take alternating loads then you need to design way below the platic deformation limit (AKA yield point) otherwise you'll get fatigue cracking. For a spring, which has to take millions of cycles without cracking, the stresses need to be so low that I'd be surprised if you manage to get permanent deformation, ie sagging of the springs. Havind said that, I'm wondering how the spring broke? What does the break surface look like? I'd be interested to know what the usual failure mechanism for car springs is; any ideas?
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