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Springs

2003 - 2009, roadster, coupe, facelift
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Simon Blythe

Springs

Post by Simon Blythe » Thu May 18, 2017 8:34 pm

Left hand Spring - M Sport
Right hand Spring - came on the car
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Steve84N
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Springs

Post by Steve84N » Thu May 18, 2017 8:57 pm

And?
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D4dawg

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Post by D4dawg » Thu May 18, 2017 8:58 pm

Erm
Point being ? Haha

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Post by Scooba_Steve » Thu May 18, 2017 9:41 pm

:tumbleweed:
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kis
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Post by kis » Thu May 18, 2017 9:44 pm

I think OP is pointing out that on one side he had a wrong spring fitted...
My E85 Z4 3.0i SMG

BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71

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Marlon
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Post by Marlon » Thu May 18, 2017 9:51 pm

Yeah, kis that was my thought - one seems longer than the other :?
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Simon Blythe

Springs

Post by Simon Blythe » Thu May 18, 2017 10:05 pm

Yeah the left hand one is a spring I purchased on the forum, an M sport Spring and the right hand spring is what's on the car. I'm assuming the right hand one is either aftermarket or an SI Spring?

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kis
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Post by kis » Thu May 18, 2017 10:36 pm

M spring is a difference of 15mm I think. The other spring is just a standard spring. Not all Zed's came with M springs... both probably correct OEM sizes, just different setups. And obviously need to both be the same, so both either standard or both M
My E85 Z4 3.0i SMG

BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71

Simon Blythe

Springs

Post by Simon Blythe » Thu May 18, 2017 11:05 pm

Which set would you guys fit?

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kis
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Post by kis » Mon May 22, 2017 1:32 pm

If I were to do it again? Eibach and fit some spacers. Will give you whatever height you want... See this.
My E85 Z4 3.0i SMG

BMW Family History (past and present):
1 Series - E87
3 Series - E46 Coupe, E46 M3, E90 (x3)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
7 Series - E32
X5 - E53, E70
X6 - E71

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Post by Artful-Bodger » Tue May 23, 2017 7:43 pm

The shorter spring is the stiffer one, so it depends what's on the front, you need to balance it?

A spring is basically a steel rod wound into a coil, the longer the rod the more it flexes (is softer) for a given load, if you try to bend a 10mm steel rod that's 500m long it's extremely stiff, now bend one that's 2000mm long and its far more flexible, it's the same with a spring, the less coils (rod length) the stiffer it is for a given diameter of steel.
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Ewazix
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Post by Ewazix » Tue May 23, 2017 8:03 pm

I was a bit mystified when I bought standard (non-spot) Sachs replacements for my std (non-sport) rears as the Sachs were a bit shorter. The OEM springs are dual rate with much thinner sections at each end, most aftermarkets are not but are slightly shorter and thicker off the car and not compressed. But once fitted and compressed they sit pretty much the same height.

I've found that the Sachs are slightly stiffer than the oem but not drastically. I suppose the aftermarkets are cheaper to make but a benefit is that they are less likely to snap as it's usually the thin'tails' that rust and break on the oem 'turkey twzizlers' :D
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