Whow, many questions! :thumbs up:
I'm going to try to answer but with the language barriere it is difficult sometimes (Yes, I learn english by watching top gear... not a good idea
)
TomK wrote: ↑Wed Aug 05, 2020 10:06 pm
It's something I've considered, and currently have an rpi scoop (not convinced that makes much difference). I'd be interested in buying/trying one... I have a Z4m specific CSL box which meets the OE intake 'tube' directly. It would be interesting to see if this makes any difference, I am due on the dyno in a couple of months for some further modifications to my current setup. It would be no big deal to a/b them.
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).
Commando_Rob wrote: ↑Wed Aug 05, 2020 10:39 pm
Great work!
Have recently fitted a carbon induction and could do with some increased air flow.
I'd be interested in buying one, how much?
For sure it will work well together. But it will work better if you can link your Simota carbon induction to your OEM tube without any leak.
ph001 wrote: ↑Wed Aug 05, 2020 11:43 pm
It’s a nice project but how can you prove any gains? The N52 engine in particular has an extremely optimised inlet tract working in conjunction with dual DISA valves. This means pressure and volume of intake is critical for maximum pumping efficiency and power.
As this mod could potentially create positive pressure in the manifold instead of partial vacuum it could actually make things worse rather than better.
Also there is a MAP sensor looking at manifold absolute pressure. It could really confuse the ecu if that reads above atmospheric.
Hey, thank you for this comment. Actually I can't prove it and it is not the goal of my subjet, I just whant to show you what it is possible to create on our car. For my feeling and driving experience, yes it work, but as proposed above, dyno test is a very good idea.
Yes, the N52 is more optimized than an N54 for example, but it only produces 88 HP / liter, it can do better for sure, it's a great engine!
If you have some doupt ask you this simple questions:
- Why making a hole on the front bumper on a M3 CSL?
- If you obstruct half of your air filter, will your car be slower?
- Why when Formula 1 car were Naturally aspirated engine, the rules limited the size of the air intake?
- Why so big??
A funny video here, see the size of this air intake for this merecedes. It produce more than 500bhp from a 2.9 liters v6:
https://www.youtube.com/watch?v=yc5ze0B0BWc
to conclude, an interesting video of the pressure inside an air box. As you can see, depending on the engine times it is sometimes very low, this is where the electronics intervene:
https://www.youtube.com/watch?v=nZorW4yfSbc
tomrdy wrote: ↑Thu Aug 06, 2020 6:47 am
I've been thinking of doing a massive grill sized scoop to replace my little DIY one... though I was going to just cut mine out of some cardboard and transfer to sheet metal
. This is next level!
+1 would be interested to see/hear any test results that show provable gains.
If you whant to do the same part at home, I will help you but really take care of the shape. It is one of the most important thing (and the "entry size"). Don't forget that:
To find the best shape, you can use a smoke machine and see how the air pass through, and confirme it using my "sand technique" describe earlier. I used both.
I do my best I hope you understand me, have a good day