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Z4 M40i incoming, looking for mods.

Posted: Tue Feb 04, 2025 6:54 pm
by Jeroen
My new toy is arriving soon and I want to start to modify it.
I would love to hear experience from you guys and any suggestions are very welcome.
My goal is to have a quick and controlable car for fast roadtrips with nice turnin feel en a few trackdays per year.

Engine
-femto unlock
-mhd stage 1 400hp-ish?
-air intake, which one?
-downpipe 200cell
-midpipe delete
-mhd stage 2 460-480hp-ish?

gearbox
-xhp software

suspension
-front upper brace
anything else?
- which coilover set for example? (Not to go low)

wheels
It comes with 19inch 799m wheels, but I gues they are heavy. Any lighter/lightweight wheels recommended?
If 18inch will improve the drivebility, please lett me know.

brakes
any recommendes mods? more bite from brakepads?

Anything else I need? :)

Z4 M40i incoming, looking for mods.

Posted: Tue Feb 04, 2025 7:07 pm
by B21
welcome..I assume its second hand version?

Z4 M40i incoming, looking for mods.

Posted: Tue Feb 04, 2025 7:08 pm
by Jeroen
Yes, build 2022, but locked ecu.
And thanks, but I have been here for some time already. :)

Z4 M40i incoming, looking for mods.

Posted: Tue Feb 04, 2025 7:13 pm
by B21
Jeroen wrote: Tue Feb 04, 2025 7:08 pm Yes, build 2022, but locked ecu.
And thanks, but I have been here for some time already. :)
When I looked at it (M40i) ..the obvious things are the MHD stage 2 tune ..I think the FEMTO issued arrived later?

Particulate filter removal

xHP maybe

Based on other experience stock intake should be fine

xHP worked well on the DCT whaqt it would do on a 3rd generation XF 8HP box not sure

Braces I think would be a waste of time

IMHO

Z4 M40i incoming, looking for mods.

Posted: Tue Feb 04, 2025 9:30 pm
by Mr Tidy
Welcome to the forum and good luck with your modifications. :thumbsup:

Don't forget we like to see photos!

Z4 M40i incoming, looking for mods.

Posted: Tue Feb 04, 2025 10:41 pm
by tweeky687
What about the AC Schnitzer engine upgrade

https://preisliste.ac-schnitzer.de/acs_ ... D_NR=28232

Z4 M40i incoming, looking for mods.

Posted: Thu Feb 06, 2025 2:41 pm
by Jeroen
The ACS is a tuning box only for cars without extra mods?
The ACS price of almost 5k is crazy.

I like to "build" it myself with the mhd route and I think I will be done at 3k with femto, mhd, downpipe and maybe the midpipe + intake.