Euro OEM M5 springs

[GaAlpinaOwner]

Has anyone used these Euro Springs with Bilstein Sports?
Europe E28 M5 Sedan
31 33 2 225 115 (Front Coil Spring-Points up to 18)
33 53 1 125 315 (Rear Up to 2/86 Production)
33 53 1 130 723 (Rear From 2/86 Production)

[1st 5er]

Standing by awaiting discussion.

[GaAlpinaOwner]

research has determined these are only decent with Boge struts and shocks that were oem....

Mtech Red are much better although they are somewhat undersprung

[cgraff]

research has determined these are only decent with Boge struts and shocks that were oem....

Mtech Red are much better although they are somewhat undersprung

Not necessarily, the Bilsteins can work well with the M5 springs.

Why would you say the M-tech reds are somewhat undersprung? Compared to the M5 springs?

-Chris

[GaAlpinaOwner]

research has determined these are only decent with Boge struts and shocks that were oem....

Mtech Red are much better although they are somewhat undersprung

Not necessarily, the Bilsteins can work well with the M5 springs.

Why would you say the M-tech reds are somewhat undersprung? Compared to the M5 springs?

-Chris

thanks for responding -
Sorry my mistake, the OEM M5 springs are slightly undersprung the MTech Reds are around 263 rate from what I am being told.

[cgraff]

research has determined these are only decent with Boge struts and shocks that were oem....

Mtech Red are much better although they are somewhat undersprung

Not necessarily, the Bilsteins can work well with the M5 springs.

Why would you say the M-tech reds are somewhat undersprung? Compared to the M5 springs?

-Chris

thanks for responding -
Sorry my mistake, the OEM M5 springs are slightly undersprung the MTech Reds are around 263 rate from what I am being told.

That rate is incorrect.

However, the spring rates are basically like so:

Softest: stock 535i / US M5
Medium: Euro M5, and with a slight decrease in ride height, as per automotive literature at the time, of roughly 10-15mm
Stiffest: M-technic springs, with a decrease of approximately 1 inch over the stock 535i and US M5.

Both Euro M5 and M-technic springs come in a variety of lengths and/or rates to count for different options on the cars such that the result is a more similar ride height.

-Chris

[GaAlpinaOwner]

Chris thanks for the feedback -

[cgraff]

Chris thanks for the feedback -

If you want more information, you will have to contact me offline.

Thanks

-Chris

[rcbmw]

I want to caution against generalizing the name of coil springs and shock absorbers. Users must be explicit in stating the full names and part numbers of parts because there are many versions of "Bilstein" absorbers, "M-Tech" coil springs, etc. this is how owners have ordered the wrong parts. In this case, "Bilstein" refers to the B8-Sport version and many OEM BMW coil springs are not suitable to be used with these absorbers.

Best,
RCBMW

[cgraff]

I want to caution against generalizing the name of coil springs and shock absorbers. Users must be explicit in stating the full names and part numbers of parts because there are many versions of "Bilstein" absorbers, "M-Tech" coil springs, etc. this is how owners have ordered the wrong parts. In this case, "Bilstein" refers to the B8-Sport version and many OEM BMW coil springs are not suitable to be used with these absorbers.

Best,
RCBMW

Which OEM coil springs are you referring to?

From what I've seen, you could in fact use both the Bilstein HD or the Bilstein Sports on the euro M5 coil springs (there's 3 different front spring PNs). It's in the 'grey' zone with regards to the metric that Bilstein says which is for "shortened" springs; although personally I'd probably use the Sports. The M-tech springs (2 different part numbers in front) should be used with Bilstein Sports, not the HDs. They can be paired with the BMW Bilstein that was also available and matched to those springs.

EDIT:
I note you mentioned discussing this offline. That is fine. If I discuss this any further it can only be offline. Needless to say on these forums information has to be more generalized.

-Chris

[rcbmw]

I will only discuss this offline.

Best,
RCBMW

[Karl Grau]

I would like to discuss this further. I'll be behind the old railway station at 0200. Make sure you aren't followed. Your sign is "the dog barks at midnight". If you don't get ''The daffodils should do well this year" as a countersign, RUN!

[GaAlpinaOwner]

All I know is that both Chris and RC helped me figure this mess out. Thanks guys

There must be history here on this particular subject, that I do not care to stir/start up....offline it is and thanks again.

David Frankel