M4 GTS Spring dimensions

[Fumanchu_uk]

Does anyone have the GTS spring dimensions to hand for both front and rear?

[FormulaMMM]

Believe these numbers can be decoded for what you need. Front & rear.

[robbo mcs]

Originally Posted by FormulaMMM

Believe these numbers can be decoded for what you need. Front & rear.

Eibach springs the first number is length, second inner diameter, third spring rate. Unfortunately, they use both metric and imperial measurements for different applications, and sometimes a mix of the two. When they use imperial, fractions are often in decimal, eg 600 225 0125 is length 6.00 inches, inner diameter 2 1/4 inches (2.25) and spring rate 125lbs/inch. Others are metric eg 140 60 0170, is 140mm length 60mm inner diameter and rate 170N/mm

Hard to make sense of the numbers on those springs, except the last number looks like spring rate in lbs/inch

[daveishi]

Originally Posted by robbo mcs

Eibach springs the first number is length, second inner diameter, third spring rate. Unfortunately, they use both metric and imperial measurements for different applications, and sometimes a mix of the two. When they use imperial, fractions are often in decimal, eg 600 225 0125 is length 6.00 inches, inner diameter 2 1/4 inches (2.25) and spring rate 125lbs/inch. Others are metric eg 140 60 0170, is 140mm length 60mm inner diameter and rate 170N/mm

Hard to make sense of the numbers on those springs, except the last number looks like spring rate in lbs/inch

That is good information, thanks for providing. The community seems to have determined the spring rates to be 400 lbs/in front and 685 lbs/in rear which don't seem to correlate with 325 front and 336 rear unless there is some conversion I'm not thinking of.

Also 52 for the inner diameter is also odd, I think it has been determined that the ID on these springs is 60mm

[markw10702]

That doesn't look like OEM KW Clubsport suspension . . .

[SYT_Shadow]

to think I was running 800/1200 before on the CS and now the GTS has pretty much half of that...

now we just need someone to post the lengths and spring rates people put onto the stock GTS suspension

[daveishi]

Originally Posted by markw10702

That doesn't look like OEM KW Clubsport suspension . . .

I think you are right, looks like an orange camber plate up top but I'm not sure about that orange tophat? Shock also looks slightly different than mine. Weird part is the spring part numbers are the same as mine so they seem to have retained the stock springs. However I just noticed his picture of the rear is showing the helper spring part no. Here is my pic of the helper and main spring part no's, and the stock front

[markw10702]

I wonder if the numbers on the springs are Eibach / BMW internal reference numbers. Sort of like a non-stocking part number. If you look at www.realoem.com there is no individual spring part, rather a "kit" sold as a set of springs with ancillary parts.

The 5/16 or 25/16 number reference may be the Eibach production date (similar to tires). 5/16 would be the 5th week of 2016. The 25/15 would be the 25th week of 2106.

[daveishi]

Originally Posted by markw10702

I wonder if the numbers on the springs are Eibach / BMW internal reference numbers. Sort of like a non-stocking part number. If you look at www.realoem.com there is no individual spring part, rather a "kit" sold as a set of springs with ancillary parts.

The 5/16 or 25/16 number reference may be the Eibach production date (similar to tires). 5/16 would be the 5th week of 2016. The 25/15 would be the 25th week of 2106.

I think you may be on to something with those fractions actually being manuf dates, they seem to line up.

Also snapped this pic of the front spring measurement tonight, my coil has almost no preload so full length should be very close to, if not, the 7.5" shown.

[PaulaBowen]

Thank you so much for the recommendations. Couldn't find the right dimensions for the springs myself.