Martyn's Z4M Coupe

Wassup · Post by **Wassup** » Sun Jun 11, 2023 10:50 pm

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

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

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

Z4M with S65, DCT, Evolve airbox, sign me up

Wassup · Post by **Wassup** » Sun Jun 11, 2023 10:55 pm

Sterling work Martyn, acceleration must be brutal

I must not search for a dct gearbox and peripherals...
I must not search for a dct gearbox and peripherals...
I must not...

Martyn · Post by **Martyn** » Wed Jun 21, 2023 8:44 am

Small update, I've been super busy with my actual day job so not had much time to play but I did order a couple of Milltek 100 Cell cats, new mid section flanges and a bit more 2.5" stainless. I'm going to remove the resonators and add the cats in their place, hopefully this will reduce the whiff at idle.

The cats sleeve on to the 2.5" stainless so would pretty easy to fit up.

1536Z4 · Post by **1536Z4** » Wed Jun 21, 2023 6:48 pm

Martyn wrote: ↑Wed Jun 21, 2023 8:44 am I did order a couple of Milltek 100 Cell cats

Was there any reason why you picked Milltek in particular as I have been looking at buying some 200 cel cats and was going to go for Jetex . Thanks.

Martyn · Post by **Martyn** » Wed Jun 21, 2023 8:51 pm

Mainly because of the price, they were 175 quid each.

1536Z4 · Post by **1536Z4** » Sat Jun 24, 2023 11:20 am

Martyn wrote: ↑Wed Jun 21, 2023 8:51 pm Mainly because of the price, they were 175 quid each.

Yes I see now they have a sale on . I am looking at the 200 cell but even on offer they are £356 each . I have seen it mentioned online they are made by HJS so worth it if thats true . You have bought 2.5 inch pipe for the cats is the rest of the exhaust 2.5 inch now ? Considering the BHP you are putting out I would think it would need to be ?

Martyn · Post by **Martyn** » Mon Jun 26, 2023 2:51 pm

The cat section is made up of 2.5". The rest of the exhaust is stock, i've left it that way as I don't believe it to be a restriction.

I treated myself to a mid rise scissor lift for the garage, the quickjacks were great, but this is next level. It's so nice to have the car at a decent height.

I removed the decat pipes and got chopping. I extended the section before the cats to allow more clearance around the gearbox, then used 4 pipe cuts on each pipe to raise the pipes to allow a straight entry into the cats.

Not my finest work but they'll do the job.

1536Z4 · Post by **1536Z4** » Mon Jun 26, 2023 4:05 pm

Martyn wrote: ↑Mon Jun 26, 2023 2:51 pm The cat section is made up of 2.5". The rest of the exhaust is stock, i've left it that way as I don't believe it to be a restriction.

Ok thanks . Have ordered my cats now . I am having my exhaust made up as I don`t have your skills . Nice lift

not jealous , not a bit jealous , definitely not jealous . Ok I`m jealous

robear · Post by **robear** » Thu Jun 29, 2023 12:56 pm

1536Z4 wrote: ↑Sat Jun 24, 2023 11:20 am
Martyn wrote: ↑Wed Jun 21, 2023 8:51 pm Mainly because of the price, they were 175 quid each.
Yes I see now they have a sale on . I am looking at the 200 cell but even on offer they are £356 each . I have seen it mentioned online they are made by HJS so worth it if thats true . You have bought 2.5 inch pipe for the cats is the rest of the exhaust 2.5 inch now ? Considering the BHP you are putting out I would think it would need to be ?

The cell matrix on the HJS cats appears to be different than the Milltek. I'm not sure Milltek's are made by HJS.

Justino · Post by **Justino** » Fri Jun 30, 2023 10:37 am

Martyn wrote: ↑Mon Jun 26, 2023 2:51 pm The cat section is made up of 2.5". The rest of the exhaust is stock, i've left it that way as I don't believe it to be a restriction.

I treated myself to a mid rise scissor lift for the garage, the quickjacks were great, but this is next level. It's so nice to have the car at a decent height.

A lift is on my wish lift - which one did you go with, Automotech ?

1536Z4 · Post by **1536Z4** » Fri Jun 30, 2023 10:49 am

robear wrote: ↑Thu Jun 29, 2023 12:56 pm The cell matrix on the HJS cats appears to be different than the Milltek. I'm not sure Milltek's are made by HJS.

Thats a shame but hopefully still a decent cat . I have just searched Milltek and HJS and they do sell downpipes with HJS cats so that is probably where it came from .

https://www.demon-tweeks.com/uk/milltek ... fd211-akn/

https://www.akstuning.co.uk/shop/home/1 ... -tfsi.html

Martyn · Post by **Martyn** » Fri Jun 30, 2023 10:55 am

Justino wrote: ↑Fri Jun 30, 2023 10:37 am A lift is on my wish lift - which one did you go with, Automotech ?

Yeah. I bought the additional lead on ramps too as my cars are quite low.

Ive done a few miles with the cats on, they certainly reduce the smell but they've introduced a little bit of rasp that I didn't have with the Fabco resonators.

Vanne · Post by **Vanne** » Sat Jul 15, 2023 6:30 am

Love that lift mate

Martyn · Post by **Martyn** » Thu Jul 20, 2023 10:49 am

Managed to pop out with the VBOX to do a quick 100-200 kph test.

Not bad, but I think there are still some improvements to be made. Keep in mind that there's 3 gear changes in a 100 to 200 kph run with the DCT box.

For comparison here's a 100-200 I did in my ~370bhp E46 M3 before switching out the diff for a 4.10. Spot the gear change lol.

Ed Doe · Post by **Ed Doe** » Thu Jul 20, 2023 11:02 am

That's mental, both the difference in time between the two, and the smoothness of the shifts in the DCT Z4M! Very tidy work Martyn

Z4-forum.com

Z4-forum.com