Forced admission for all Z4 e85/e86 (all engines)

dougie1142 · Post by **dougie1142** » Thu Aug 06, 2020 11:10 am

This is really great work, love seeing people doing this sort of stuff and researching further. Can't wait to see the results, will you be getting the car dyno'd before and after you have installed?

M1k3yC · Post by **M1k3yC** » Thu Aug 06, 2020 11:23 am

Gazzzz, thank you for sharing this. It's really interesting to see what you've done!

ph001 · Post by **ph001** » Thu Aug 06, 2020 11:41 am

Gazzzz wrote: ↑Thu Aug 06, 2020 7:14 am If you have some doupt ask you this simple questions:

- Why making a hole on the front bumper on a M3 CSL?

The M3 CSL runs Alpha N system in conjunction with MAP sensor so it can fuel properly for air-ram effect. None of the Z4 models can. If Z4 intake manifold runs with positive pressure, it could cause some strange fuelling problems.

This is the sensor that could give you problems, it helps ECU determine engine load...

: Z4 map sensor.png (1.31 MiB) Viewed 1494 times

The issue with any dyno testing you do is that it is not going to include hardly any air-ram effect so at best your results will be meaningless, at worst misleading.

Sorry if I sound negative - I love your engineering skills but people need to be aware of potential issues before installing such a mod.

TomK · Post by **TomK** » Thu Aug 06, 2020 12:02 pm

Gazzzz wrote: ↑Thu Aug 06, 2020 7:14 am
Have you got pictures of your link between the CSL air Box and the OEM tube? Is it really impervious (I don't if this is the good word, I mean Air-proof, or without any air-leak)? this may really interest me, I plan to buy one too. Yes, dyno is the right solution to measure the difference, but you have to find one with a fan linked to the speed of the car to simulate wind effect (it must increase in the same time).

It's not a great photo but you can see. It is not completely airtight at the moment but it wouldn't take a lot to make it so, I'll have a look when I'm next with the car.
Let me know if you are willing to share one of your prototypes and I will put it on a suitable dyno.

: DSC_2181.JPG (262.5 KiB) Viewed 1488 times

Gazzzz · Post by **Gazzzz** » Thu Aug 06, 2020 1:35 pm

dougie1142 wrote: ↑Thu Aug 06, 2020 11:10 am This is really great work, love seeing people doing this sort of stuff and researching further. Can't wait to see the results, will you be getting the car dyno'd before and after you have installed?

Yes, it is the idea but not before the end of the year

M1k3yC wrote: ↑Thu Aug 06, 2020 11:23 am Gazzzz, thank you for sharing this. It's really interesting to see what you've done!

You're welcome!

The M3 CSL runs Alpha N system in conjunction with MAP sensor so it can fuel properly for air-ram effect. None of the Z4 models can. If Z4 intake manifold runs with positive pressure, it could cause some strange fuelling problems.

This is the sensor that could give you problems, it helps ECU determine engine load...

Not realy exact. You can tune your M version with alpha-N gestion using the evolve complete solution here:
https://www.evolveautomotive.com/evolve ... w-z4m.html

Or here:
https://power-plus.be/site/?p=3351&lang=en

But this is not the subjet for today

-On an M5 e60, using air ram and an exhaust you optain nearly +30hp...
-You can find many video showing that a sports air filter increases performance.. why?
-why this?

The gain isn't obtain by increase the presure but the flow and the temperature.
Contrary to popular belief though, air is not pushed into this inlet, but the engine is sucking air in... Naturally ASPIRATED.
As you can see in the previous video, the flow up and down during the engine running.
Sometimes there isn't enough air, sometimes it's OK:

https://www.youtube.com/watch?v=nZorW4yfSbc

With this part, it is colder, more constante. That is as easy as it simce to be.

The OEM part here:

is really restrictive to allow our car to run in all conditions possible (in the dust for example), I don't need this.

Let me know if you are willing to share one of your prototypes and I will put it on a suitable dyno.

Thank you for this photo

At this moment I only have seven of this piece, there are all for friends. But some of you ask me here or with PM for one, so why not produce a little more.

Sgr74 · Post by **Sgr74** » Fri Aug 07, 2020 7:28 pm

I was going to ask about rain getting into the filter. Ive put a ramair cone filter on with a very rudimentary heat shield. I thought about altering the intake scoop but because I’m in Scotland, it’s kinda wet at times and I was a bit worried about water Getting to the filter.

Gazzzz · Post by **Gazzzz** » Sun Nov 01, 2020 7:01 pm

Hello,
just some new pictures to show you the final product after sanding and painting. It is perfect, it look like OEM part, I'm very happy

Gazzzz · Post by **Gazzzz** » Sun Nov 01, 2020 7:07 pm

Here is a comparison, OEM versus Home made!

Commando_Rob · Post by **Commando_Rob** » Sun Nov 01, 2020 7:48 pm

Looks awesome, Are you going to be in a position to sell them? Like I said before would be interested in purchasing?

Sgr74 · Post by **Sgr74** » Sun Nov 01, 2020 8:06 pm

Gazzzz wrote: ↑Sun Nov 01, 2020 7:01 pm Hello,
just some new pictures to show you the final product after sanding and painting. It is perfect, it look like OEM part, I'm very happy

Again, as above. It may be a silly question, but what about water getting in if it’s raining. Would this not cause problems?

beanie · Post by **beanie** » Sun Nov 01, 2020 10:06 pm

Gazzzz wrote: ↑Sun Nov 01, 2020 7:07 pm Here is a comparison, OEM versus Home made!

That looks really good.

As for the benefits, I think the only way to get any meaningful data would be to datalog before and after as a dyno won’t properly simulate the airflow.

Z4C_er · Post by **Z4C_er** » Mon Nov 02, 2020 9:55 am

Gazzzz wrote: ↑Sun Nov 01, 2020 7:01 pm Hello,
just some new pictures to show you the final product after sanding and painting. It is perfect, it look like OEM part, I'm very happy

As others have asked, when/if you are in a position to sell, I would be interested! Please put my name in to the queue!

Ewazix · Post by **Ewazix** » Mon Nov 02, 2020 10:29 am

There are of course a lot of similar products out there, this example has been optimised for maximum flow rates and is fully field tested. It is also available in various colours. My wife has had one fitted for a while and the problem has been occasional leaks around the inlet flange.

: BMW_Shewee.png (89 KiB) Viewed 1230 times

Just a bit of British humour, it's a impressively researched project

enuff_zed · Post by **enuff_zed** » Mon Nov 02, 2020 10:41 am

Ewazix wrote: ↑Mon Nov 02, 2020 10:29 am There are of course a lot of similar products out there, this example has been optimised for maximum flow rates and is fully field tested. It is also available in various colours. My wife has had one fitted for a while and the problem has been occasional leaks around the inlet flange.

BMW_Shewee.png

Just a bit of British humour, it's a impressively researched project

Took a few seconds that one!

BMWZ4MC · Post by **BMWZ4MC** » Mon Nov 02, 2020 12:32 pm

Ewazix wrote: ↑Mon Nov 02, 2020 10:29 am There are of course a lot of similar products out there, this example has been optimised for maximum flow rates and is fully field tested. It is also available in various colours. My wife has had one fitted for a while and the problem has been occasional leaks around the inlet flange.

BMW_Shewee.png

Just a bit of British humour, it's a impressively researched project

Just don’t turn your back on her when she’s feeling frisky!

Very impressive work Gazzzz, I’m watching this thread with interest

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