[Juliana19]

Hi all,

Sorry if this has been done to death but couldn't find in the search...

I have the M Perf coilovers and am finding them far too soft for track use, even with the dampers stiffened up to the recommended and above settings.

In the long run I'll look to replace the M perf set up with either Nitron or Ohlins but in the mean-time I'm looking for a quick and cheap option to get a bit more body control (at the sacrifice of some comfort on the road).

I believe the M perf coilover is basically a rebranded KW V3 but with a softer spring (although when I spoke to KW they wouldn't speak to me as that is top secret between them and BMW).

I was thinking I could use the KW spring rate from the kit and fit to my M perf damper and wondered if anyone had experimented with this or had any insight into spring rates etc.

Any help would be much appreciated

Thanks - Jonny

[M Fifty]

Have a look here:

https://f87.bimmerpost.com/forums/sh....php?t=1590553

[Juliana19]

Originally Posted by M Fifty

Have a look here:

https://f87.bimmerpost.com/forums/sh....php?t=1590553

Brill thanks

[Juliana19]

Originally Posted by M Fifty

Have a look here:

https://f87.bimmerpost.com/forums/sh....php?t=1590553

Do you happen to know what spring length I would need front and rear?

[M Fifty]

Well, they might not tell you what the rates are, but maybe they will sell you some springs?

[_pancho_]

Hi,
I have KW V3 and found the front way to soft, so replaced my progressive front springs with Linear H&R 120 mm 140 N/mm + helper spring 80 mm 20 N/mm.
This was a great update for us running the car on track

[Juliana19]

Originally Posted by _pancho_

Hi,
I have KW V3 and found the front way to soft, so replaced my progressive front springs with Linear H&R 120 mm 140 N/mm + helper spring 80 mm 20 N/mm.
This was a great update for us running the car on track

Interesting thanks

[Juliana19]

Originally Posted by _pancho_

Hi,
I have KW V3 and found the front way to soft, so replaced my progressive front springs with Linear H&R 120 mm 140 N/mm + helper spring 80 mm 20 N/mm.
This was a great update for us running the car on track

Which spring length and ID did you buy? I think I'm now set on trying a stiffer spring but want to make sure I'm ordering the right coilover spring

[_pancho_]

Originally Posted by Juliana19

Which spring length and ID did you buy? I think I'm now set on trying a stiffer spring but want to make sure I'm ordering the right coilover spring

HRF120140 60mm ID, 120mm, 140N/mm
HZF080020 60mm ID, 80mm, 20N/mm
10382 Adapter 90-60 For 60mm spring F2X
10202 Middlering 60mm

I ordered from Millway

[Juliana19]

Originally Posted by _pancho_

HRF120140 60mm ID, 120mm, 140N/mm
HZF080020 60mm ID, 80mm, 20N/mm
10382 Adapter 90-60 For 60mm spring F2X
10202 Middlering 60mm

I ordered from Millway

AHh ok this is slightly different for me as the BMW M Perf doesn't have a helper spring so wasn't planning on including one into the setup was just looking for a straight swap against the existing spring for a slightly stiffer one

[_pancho_]

Originally Posted by Juliana19

AHh ok this is slightly different for me as the BMW M Perf doesn't have a helper spring so wasn't planning on including one into the setup was just looking for a straight swap against the existing spring for a slightly stiffer one

Front KW v3's don't have a helper spring in original either, but was needed for my linear conversion according to Millway, and it works great

[Juliana19]

Originally Posted by _pancho_

Front KW v3's don't have a helper spring in original either, but was needed for my linear conversion according to Millway, and it works great

OK thanks, might just order exactly the same then! Have you left the rears stock?

[_pancho_]

Hi, yes the rears are left as is