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Color codes on springs


Guest Anonymous

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Guest Anonymous

what I wrote a year and more ago on the bouncy subject- see if this helps:

02 springs , color code, free length, lb. rate ... (34 views)

Message: ....here's what I added way back on 01/11/02 on the subject - thanks to Beta Search at the top of this board. Al, toss another Kitten on the barby !!.

Message Title: 02 SUSPENSION SPRINGS rates / colors / wire dia.

Posted by: Creighton D. on 2002-11-01 at 04:59:47 (

stock 02 susp coil spring colour codes & MORE>

Posted by: Creighton D. on 2002-11-01 at 04:51:29

this is for oem / stock / BMW factory suspension coil springs !

not aftermarket

stock / oem 02 suspension coil spring colour codes and free length (not mounted length);

REAR SUSP SPRINGS

Green 776-803 lbs

White 750-776 lbs

Red 725-750 lbs

wire thickness 12.3mm (.049")free length unmounted 334.6 (13.17")

Heavy duty conversion ( for trailer towing )

grey/green 769-789 lbs

grey/white 730-769 lbs

grey/red 710-730 lbs

wire thickness 13.2mm (.052") free length of unmounted 324.2mm (12.76")

FOR touring - USE ONLY RED (in emergency WHITE is permissable

always use "1 Dot " rubber top cushion

FRONT SUSP SPRINGS

green/blue 635-656 lbs

white/blue 614-636 lbs

red/blue 595-614 lbs

wire thickness 11.8mm (0.465") free length unmounted 337.2mm (13.28")

Heavy duty conversion (only if rear is also converted)

green/grey/green 606/626 lbs

white/grey/white 584-606 lbs

red/grey/red 564-584 lbs

wire thickness 12mm (0.47") free length unmounted 345mm (13.58")

..........SO, AS YOU CAN SEE , WHEN INSPECTING UNKNOWN SPRINGS, THE FREE LENGTH CAN BE CLOSE, BUT IT'S THE WIRE THICKNESS THAT YOU NEED TO MEASURE CAREFULLY

THIS REF. FROM BMW REPAIR MANUAL (PRINTED) VOL.2

>>>>>>>>>>>>>>>> HAPPY SPRING HUNTING ! <<<<<<<<<<<<<<

--------------------------------------------------------------------------------

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Guest Anonymous

If you look at the numbers cited, it's clear the numbers don't reflect spring rate in any normal sense.

The Heavy Duty numbers are lower than the Standard, and the rears are disproportionate.

These units are not spring rates in the terms of force vs distance. I don't have the page in front of me, but does BMW spec these in lbf (pound-force)?

The number kinda look like closer to the force seen by the coils at the installed heights (fronts are close to corner weights, and the rear numbers are higher due to the geometry of the traing arm.) Problem with that theory is there's still no explanation why the HD is lower number than STD, so I still don't know what gives. Anyone gets an answer to this, it should be explained in the FAQ, because those numbers don't relate to anything we can compare with.

I've posted the actual spring rates for certain OE & aftermarket springs before, and my numbers were similar to the data I pulled from Dinan & ST years ago. I'd have to search roadfly to find it, I don't have the data here with me.

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