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Martyn's Z4M Coupe

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Vanne
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Martyn's Z4M Coupe

Post by Vanne » Mon May 15, 2023 12:49 pm

Awesome progress mate!! top notch :) love the gearbox, thats magic :) pure magic :D
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Martyn's Z4M Coupe

Post by tomscott » Mon May 15, 2023 1:02 pm

Holy moly.

This thing will be insane!! Always wondered what a DCT S54 would be like im sure it is epic.

Great work!

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Post by RMB » Mon May 15, 2023 2:00 pm

What’s the gearing like Martyn? Are the ratios a bit closer and is 7th longer (than 6th manual) for cruising?

BTW Sounds insane on full chat!
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Post by Martyn » Mon May 15, 2023 2:42 pm

The gearing is pretty close with a single overdrive in 7th. Cruising in 7th the revs are a little higher than I'd like but that could easily be sorted with a 3.15 CWP from an E9x M3.

E9x DCT Box Ratios
1st 4.78
2nd 3.056
3rd 2.153
4th 1.678
5th 1.39
6th 1.203
7th 1

Max speed at 8000rpm with E9x DCT with 3.62

1st 36 mph
2nd 56 mph
3rd 79 mph
4th 102 mph
5th 123 mph
6th 142 mph
7th 171 mph

Compared to the stock ratios, which I assume are the same as the getrag in the M3.

1st 4.23
2nd 2.53
3rd 1.67
4th 1.23
5th 1
6th 0.83

1st 39.4 mph
2nd 65.8 mph
3rd 99.4 mph
4th 134.95 mph
5th 165.99 mph
6th 199.99 mph

If I fitted a 3.15 diff the max speeds are as follows:

Max mph at 8000rpm with E9x DCT with 3.15

1st 41 mph
2nd 64 mph
3rd 91 mph
4th 117 mph
5th 141 mph
6th 163 mph
7th 197 mph

The E9x M3 DCT track boys love fitting 3.62s but I guess not many of them sit and cruise on the motorway :D

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Post by Z4MCoupe86 » Thu May 18, 2023 9:42 pm

What are the benefits of keeping the s54 in this setup vs using the s65? S65 weighs less, makes more power, better weight distribution, and higher potential for power?

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Post by RMB » Thu May 18, 2023 9:51 pm

Is 575bhp not enough for you?😊
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Post by Z4MCoupe86 » Thu May 18, 2023 10:08 pm

Less weight and closer to the center of the vehicle to help handling? Not a critique, just wondering the thought process from a design standpoint

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Post by Martyn » Wed May 31, 2023 12:41 pm

Everything is still working nicely with the DCT, no regrets so far! It still needs a bit of tweaking but so far so good.

I finally got round to changing the high pressure vanos line as I forgot to do it when the headers off, no pics as it's pretty boring.

I also wired in a 12v to USB socket to an ignition live so I could charge my tablet without having to use the 'always on' cig lighter socket.

My replacement tablet (Lenovo Legion Y700) also arrived which I'd hoped would fit nicely in front of the screen, and it does! I've disconnected the screen so it doesnt try and open/close on key on / off.

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I routed the charging cable down to my new USB socket which is installed behind the glove box.

Image

I also designed a mounting plate for a couple of custom buttons I plan to mount behind the steering wheel.

Image

And printed in CF reinforced PETG.

Image

It'll fit behind the steering wheel, and have one momentary switch for launch control/clutch by wire and a latching switch for traction on / off.

Image

The custom laser engraved switches are coming from Aus so will take a while to arrive :(

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Post by Martyn » Tue Jun 06, 2023 7:21 pm

Buttons have arrived, so I wired them in and got them mounted.

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One for launch control (momentary) via the DCT box, and the other to toggle traction control (latching) on and off via the MaxxECU.

On the other side of things, my brake light switch is b0rked, so my brake lights are stuck on. New one on order :oops:

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Post by Mikey_Boy » Fri Jun 09, 2023 1:26 pm

That is pretty epic Martyn! 8)

I can see why you’ve gone the route you have - awesome results.

I know Tom K and I salivate about S65 swaps!! :evil:

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Post by Ed Doe » Fri Jun 09, 2023 6:03 pm

Mikey_Boy wrote: Fri Jun 09, 2023 1:26 pm That is pretty epic Martyn! 8)

I can see why you’ve gone the route you have - awesome results.

I know Tom K and I salivate about S65 swaps!! :evil:
And me and me! :lol:
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Martyn's Z4M Coupe

Post by LawrenceW » Fri Jun 09, 2023 8:01 pm

WTF, pure dark arts. Martyn not so long ago they would have burnt you at the stake for such witchcraft!

Inspiring work mate

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Post by Simon 3.2M » Sat Jun 10, 2023 6:53 am

Absolutely amazing work - I can imagine there would be a few who would like you to convert their cars once you’ve finished!!
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Post by Martyn » Sat Jun 10, 2023 8:44 am

Thanks all.

I fitted the new brake light switch only to have the same issue :roll: , I did a bit of head scratching then bust out the multimeter and checked, turns out number 14 had blown. I replaced that and all was good in the hood again.

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Post by john-e89 » Sat Jun 10, 2023 9:11 am

I'm in awe of your capabilities.... absolutely superb car..! :thumbsup: :driving:
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