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Hi rob thanks for the advice...

got some cataclean today so going to use this additive with the fuel and then stick to premium unleaded.

So ill run it for another 500miles and then mapping here i come.

What engine is in this??

Sorry but the plate cheapens the car. I’m a fan of pushing boundaries and I usually run a slightly shorter plate in height and sometimes length but not like that! Nothing wrong with your reg, but normal length would look better in my opinion.

Carbon aerial? Plain black OEM looking ones on eBay for £5.

And definitely complete the debadge by taking off the M badges

salb wrote: ↑Wed Nov 29, 2017 5:57 pm Hi rob thanks for the advice...

got some cataclean today so going to use this additive with the fuel and then stick to premium unleaded.

So ill run it for another 500miles and then mapping here i come.

Cataclean? You have a diesel Z4?

cataclean for unleaded engines.

sal

SteveSmith wrote: ↑Wed Nov 29, 2017 8:48 pm . . .
Sorry but the plate cheapens the car. I’m a fan of pushing boundaries and I usually run a slightly shorter plate in height and sometimes length but not like that! Nothing wrong with your reg, but normal length would look better in my opinion.
. . .

I agree with this, I like the number plate but on a normal size plate it would look better.

Nictrix wrote: ↑Wed Nov 29, 2017 1:04 pm The front plate would be illegal anyway as there is not enough white between the letters and the edge of the plate. Im sure it should be 25mm at the edges.

I do hope you‘re wrong - I’ve shortened mine - 15mm at the ends!
Rear plate is standard but fixed with double sided tape.

ronk wrote: ↑Thu Nov 30, 2017 12:53 am

Nictrix wrote: ↑Wed Nov 29, 2017 1:04 pm The front plate would be illegal anyway as there is not enough white between the letters and the edge of the plate. Im sure it should be 25mm at the edges.

I do hope you‘re wrong - I’ve shortened mine - 15mm at the ends!
Rear plate is standard but fixed with double sided tape.

see my post on page 1 with the specs

salb wrote: ↑Wed Nov 29, 2017 5:57 pm ... and then stick to premium unleaded.

Why? BMW specify 95 RON. (Look inside your fuel cap.)

Busterboo wrote: ↑Thu Nov 30, 2017 11:57 am

salb wrote: ↑Wed Nov 29, 2017 5:57 pm ... and then stick to premium unleaded.

Why? BMW specify 95 RON. (Look inside your fuel cap.)

they also mention that the car can be washed in an automatic carwash in the handbook, not all advise from BMW is sound. I always use 97 ron in my z4 as do many other forum users.

Busterboo wrote: ↑Thu Nov 30, 2017 11:57 am

salb wrote: ↑Wed Nov 29, 2017 5:57 pm ... and then stick to premium unleaded.

Why? BMW specify 95 RON. (Look inside your fuel cap.)

Isn't 95 RON Premium Unleaded? Higher than 95 RON is Super Unleaded.

Lazza wrote: ↑Thu Nov 30, 2017 1:05 pm

Busterboo wrote: ↑Thu Nov 30, 2017 11:57 am

salb wrote: ↑Wed Nov 29, 2017 5:57 pm ... and then stick to premium unleaded.

Why? BMW specify 95 RON. (Look inside your fuel cap.)

Isn't 95 RON Premium Unleaded? Higher than 95 RON is Super Unleaded.

Of course you can run 91, 95, 97 or 99 ron fuel. It's all to do with the amount of ignition advance that ECU can run without knocking occuring. Generally, the higher the octane, the more advance you can run (within limits) which results in more power. The premium octane fuels also tend to have more advanced detergents in them to help prevent gumming and deposits forming in the fuel system.

jamie_z4 wrote: ↑Thu Nov 30, 2017 8:29 am

ronk wrote: ↑Thu Nov 30, 2017 12:53 am

Nictrix wrote: ↑Wed Nov 29, 2017 1:04 pm The front plate would be illegal anyway as there is not enough white between the letters and the edge of the plate. Im sure it should be 25mm at the edges.

I do hope you‘re wrong - I’ve shortened mine - 15mm at the ends!
Rear plate is standard but fixed with double sided tape.

see my post on page 1 with the specs

As Jamie has shown it appears to be 11mm at the sides as well.
I am sure at some point the edges had to be bigger.

ph001 wrote: ↑Thu Nov 30, 2017 1:21 pm Of course you can run 91, 95, 97 or 99 ron fuel. It's all to do with the amount of ignition advance that ECU can run without knocking occuring. Generally, the higher the octane, the more advance you can run (within limits) which results in more power. The premium octane fuels also tend to have more advanced detergents in them to help prevent gumming and deposits forming in the fuel system.

I thought the ecu used the knock sensor to detect preignition so it could detect low quality/low octane fuel and retard timing to prevent damage to the engine. I didn’t think it would also advance the timing to give more power with higher octane fuel.

Lazza wrote: ↑Thu Nov 30, 2017 8:35 pm

ph001 wrote: ↑Thu Nov 30, 2017 1:21 pm Of course you can run 91, 95, 97 or 99 ron fuel. It's all to do with the amount of ignition advance that ECU can run without knocking occuring. Generally, the higher the octane, the more advance you can run (within limits) which results in more power. The premium octane fuels also tend to have more advanced detergents in them to help prevent gumming and deposits forming in the fuel system.

I thought the ecu used the knock sensor to detect preignition so it could detect low quality/low octane fuel and retard timing to prevent damage to the engine. I didn’t think it would also advance the timing to give more power with higher octane fuel.

It depends what the engine was designed to run on. The S54 was 97ron so only at that octane rating will it produce the on-paper specs. Running normal unleaded, it will possibly retard the ignition at high rpm, esp if combined with low altitude and cold temps. The jury is out whether going to 99ron gives more power than stock but I suspect not.