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Martyn's Z4M Coupe

"M" Specific discussion
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Ed Doe
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Martyn's Z4M Coupe

Post by Ed Doe » Thu Dec 01, 2022 7:26 pm

One of the best threads in ages this, hats off to you Martyn! So refreshing to see someone rolling their sleeves up and fettling an M instead of banging on about future values and maintaining main dealer service history...!
Carbon Black '07 M Coupe: Intrax 1k2 Coilovers, AP-Racing, Raybestos ST45s, Tillets, Schroth, Vibratechnic, Apex EC7, Strongstrut, Eventuri, H&S, RTD, 4.1FD :evil:
Silver Grey '06 3.0si Coupe - SOLD :(

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Post by Vanne » Tue Dec 27, 2022 6:25 am

Wow, cant believe i missed this thread completely mate, beaut work.. :thumbsup: car is starting to look tasty, thats for sure. Very keenly interested in the Maxxecu work that your planning. Subbed for more goodness.. :driving:
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Martyn
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Post by Martyn » Tue Dec 27, 2022 10:02 am

Vanne wrote: Tue Dec 27, 2022 6:25 am Wow, cant believe i missed this thread completely mate, beaut work.. :thumbsup: car is starting to look tasty, thats for sure. Very keenly interested in the Maxxecu work that your planning. Subbed for more goodness.. :driving:
Thanks!

The Maxx is awesome, I remade my plug and play adapter so I could tuck everything neatly away by the GM5 module.

Image

I also added the provision for plugging in the DCT loom, shifter and drive logic button in case I decide to DCT the car at a later date :thumbsup:

Image

After re-making the loom I fired it up and checked everything still worked :)

https://www.ecuworx.co.uk/wp-content/up ... G_1292.mp4

I've hooked up one of the additional air temp sensors so I can have pre and post charge cooler temps, and I've also hooked up the PWM line to one of the Maxx's outputs so I can control the pump speed via PWM.

I was all ready to start dialling the car in on the Maxx but I noticed the BSD functions werent working meaning no oil temp or alternator control, thankfully MaxxECU have shipped me a new BSD module to try as I'm confident in my wiring.

Other than that I've barely driven the car to be honest.

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Martyn's Z4M Coupe

Post by Beedub » Wed Dec 28, 2022 5:42 pm

thread of the year for me..... amazing stuff..... i want that ECU :evil: :evil: :evil: :evil: :evil:
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Martyn's Z4M Coupe

Post by Ed Doe » Wed Dec 28, 2022 7:53 pm

Beedub wrote: Wed Dec 28, 2022 5:42 pm thread of the year for me..... amazing stuff..... i want that ECU :evil: :evil: :evil: :evil: :evil:
Seconded, hats off to you Martyn for just getting on with things, really genuinely interesting stuff
Carbon Black '07 M Coupe: Intrax 1k2 Coilovers, AP-Racing, Raybestos ST45s, Tillets, Schroth, Vibratechnic, Apex EC7, Strongstrut, Eventuri, H&S, RTD, 4.1FD :evil:
Silver Grey '06 3.0si Coupe - SOLD :(

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Post by Martyn » Thu Dec 29, 2022 6:35 pm

Thanks :)

I got my replacement BSD board wired in and started tuning the Maxx for the SC setup. Also got my old Nvidia tablet setup with MDash, which is a dash app from MaxxECU.

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MDash is excellent, you can pick any of the hundreds of parameters to display and it's streamed realtime over bluetooth.

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Post by peteslag » Sat Dec 31, 2022 11:47 pm

Martyn wrote: Tue Nov 29, 2022 11:38 am
grannyknot wrote: Sun Nov 27, 2022 10:17 pm Great work Martyn, just a note before you install the heat baffles, that centre bearing on the driveshaft has to be pre-tensioned toward the rear of the car. You'll notice the slots on the mounts of the bearing, it's not a lot but it is suppose to help.
TIS doesn't mention anything about preloading the CSB on the Z4M interestingly enough. I know the preloading was required on older BMWs though.

I had an hour or so on the car yesterday so my attention turned to yet more exhaust work. Upon removing the center section I noticed some cracking on the flanges of both the back boxes and the center section.

Image

Image

I bust out the tig and managed to weld the crack up on the center section, but this wasn't going to work on the back boxes due to how thin the metal was and how close to the edge the crack ran. I'm convinced the aftermarket 2 pieces exhaust clamps are the cause of these cracks.

I pulled off the back boxes and noticed that one of the hangers had cracked at the weld, so I cleaned that up and tig'd it (didn't get a picture as it wasn't particularly pretty, however it'll hold fine).

Image

Next I cut off all 4 flanges :o Back box flanges shown below.

Image

Test fit of a 2.25" / 58mm sleeve clamp.

Image

Like a glove!

Image

Image

I popped the center section and back boxes back on to the car and called it day

My "brand new" second hand headers turned up this morning so I hope to get those wrapped today and fitted.
What a great idea. One of my exhaust flanges has disintegrated so I'll be doing this. Thanks for sharing.

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Post by Martyn » Fri Jan 13, 2023 3:02 pm

My Ultra Racing brace finally turned up so I chucked that on at lunch time today.

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It's certainly a tight fit around the IACV hose.

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Martyn's Z4M Coupe

Post by T1berious » Tue Jan 17, 2023 3:02 pm

This is an absolutely epic thread!

I'm quite frankly in awe!
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Post by Argenta » Tue Jan 17, 2023 5:26 pm

I regurarly giggle at Ultra braces.. Certainly no brainy engineers over there! :)

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Post by Martyn » Tue Jan 17, 2023 5:42 pm

T1berious wrote: Tue Jan 17, 2023 3:02 pm This is an absolutely epic thread!

I'm quite frankly in awe!
Thank you!
Argenta wrote: Tue Jan 17, 2023 5:26 pm I regurarly giggle at Ultra braces.. Certainly no brainy engineers over there! :)
Probably why they're cheap :D

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Post by Wassup » Thu Jan 19, 2023 2:14 am

Martyn wrote: Tue Nov 29, 2022 11:38 am
grannyknot wrote: Sun Nov 27, 2022 10:17 pm Great work Martyn, just a note before you install the heat baffles, that centre bearing on the driveshaft has to be pre-tensioned toward the rear of the car. You'll notice the slots on the mounts of the bearing, it's not a lot but it is suppose to help.
TIS doesn't mention anything about preloading the CSB on the Z4M interestingly enough. I know the preloading was required on older BMWs though.

I had an hour or so on the car yesterday so my attention turned to yet more exhaust work. Upon removing the center section I noticed some cracking on the flanges of both the back boxes and the center section.

Image

Image

I bust out the tig and managed to weld the crack up on the center section, but this wasn't going to work on the back boxes due to how thin the metal was and how close to the edge the crack ran. I'm convinced the aftermarket 2 pieces exhaust clamps are the cause of these cracks.

I pulled off the back boxes and noticed that one of the hangers had cracked at the weld, so I cleaned that up and tig'd it (didn't get a picture as it wasn't particularly pretty, however it'll hold fine).

Image

Next I cut off all 4 flanges :o Back box flanges shown below.

Image

Test fit of a 2.25" / 58mm sleeve clamp.

Image

Like a glove!

Image

Image

I popped the center section and back boxes back on to the car and called it day

My "brand new" second hand headers turned up this morning so I hope to get those wrapped today and fitted.
I remember looking this up in TIS too as I was expecting it to be preloaded like in the E46 M3 I did a few years back but no mention of it for the Z4M. From what I understand, the Z4M propshaft doesn't have a separate ACB bearing on the front half of the propshaft so doesn't require preloading.
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Martyn's Z4M Coupe

Post by Wassup » Thu Jan 19, 2023 2:17 am

Hats off to you Martyn, fascinating read and great insights on our beloved Z4M :thumbsup:
2008 Z4MR Ruby Black, Sepang Hell, Carbon Weave
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Post by Vanne » Tue Feb 21, 2023 2:24 am

Hows the progress coming along mate? :) :thumbsup:
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Post by Martyn » Wed Feb 22, 2023 10:13 am

Hey,

No real updates as such, although I do have a few things on my list I need to sort:

- Replace supercharger belt, along with the top idler pulley.
- Replace the alternator which is throwing BSD errors.
- Fix a slow leak with the washer bottle / headlight washers.

Replacing the alternator will be a pain as the bottom alternator bolt (supplied with the SC kit) is too long to remove without tilting the engine or removing the front end of the car :roll:

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