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Old 21st January 2008, 20:49   #1
ra0507
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Plugging holes in air intake?

I have received, but not yet installed the RPI scoops. I have read about some that have plugged some holes in the air intake with some benefits. Can someone explain this in some detail?

Rick

P.S. The sentence above contains an awful lot of "somes"!

Last edited by ra0507; 22nd January 2008 at 00:09.
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Old 21st January 2008, 22:26   #2
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Rick:

Give Eloy a call. We actually manufacture the plugs as well. They're very inexpensive (currently $20).

Another way to go would be to make your own, and find a way to affix it to that location. Some people have used duct tape I believe.
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Old 21st January 2008, 22:28   #3
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where are these holes??
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Old 21st January 2008, 22:36   #4
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They're at the bottom of the air intake.
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Old 21st January 2008, 23:21   #5
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Quote:
Originally Posted by BD 997 View Post
where are these holes??
The holes are at the bottom of the airbox. It leads under
the car. See these diagrams:

See part 16 from this diagram:
http://www.realoem.com/bmw/showparts...42&hg=13&fg=20

It seems reasonable to think that it's there to create airflow by
generating a pressure differential. This would pull air from the
intake ducts from the front (part 20 in the diagram). You can see
that something like this might be necessary as the direction of
the intake ducts are perpendicular to the air flow. So perhaps
as air flows past the "rubber buffer" it might create a lower
pressure region causing air to flow through the ducting. It's also
conceivable that because it's constantly flowing air it may tend
to keep the air in the airbox cooler?

By adding scoops to the front you are forcing air into the ducts
so air is already flowing into this area. Keeping the buffer open
at least gives good, repeatable results as seen in all the RPi Ram
Air threads. It seems like plugging up the "buffer" you could be
building up pressure in the airbox. What is the result of this? Well,
just from my dynos it appears to add a bit of midrange hp/tq.
But this is just one set of dynos. Until others try this and do before
and after dynos I don't think we can conclude anything. Deknight
was supposed to run a few tests but I'm not sure if he had
the opportunity to dyno yet.

I don't have access to CFD software anymore (different lifetime
it seems) so I can only speculate on any of this. Maybe someone out
there does? Perhaps they could throw a quick model together and
run a simulation to determine theoretically if there is any benefit.
Of course that would be pretty hardcore.
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Old 22nd January 2008, 00:35   #6
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Here's an additional mod that I've made - no idea if it has any benefit.

I noticed that after install, if you follow the airflow through the scoop, there is a small opening that looks to me like some of the air directed into the scoop would escape out this opening and not be forced into the intake. So I just took some aluminum tape, and covered this opening. It doesn't reduce any of the airflow to the intake, and may help build some pressure. I'll probably use the good old aluminum tape for to plug the hole as well.

If anyone is really interested, I can post some pic's.
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Old 22nd January 2008, 00:42   #7
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Quote:
Originally Posted by Wolverine View Post
Here's an additional mod that I've made - no idea if it has any benefit.

I noticed that after install, if you follow the airflow through the scoop, there is a small opening that looks to me like some of the air directed into the scoop would escape out this opening and not be forced into the intake. So I just took some aluminum tape, and covered this opening. It doesn't reduce any of the airflow to the intake, and may help build some pressure. I'll probably use the good old aluminum tape for to plug the hole as well.

If anyone is really interested, I can post some pic's.
Pics please I think I know what you are referring to.
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Old 22nd January 2008, 01:22   #8
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Here are installation instructions for our block off plates. We were originally going to make a larger plate so it completely sealed the bottom hole but we felt it would be safer with it slightly smaller plate so any moisture that finds its way in will come out of the sides.

http://www.raceprecision.com/forums/....php?p=357#357
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Old 22nd January 2008, 01:47   #9
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I am a bit confused here.
First I see the claims of 17 rwhp gain from the RPI scoops. I have a hard time w/ that. There is noway the some fans blowing in front of the car can simulate the actual force of air rushing in thru the air boxes while driving at 100 mph. This applies as I see it, to air intake systems.
I use to have the Gruppe M intakes but I still have the CF piece which sits behind the Kidney grills which funnels air into the air boxes. This appears very similar to the RPI scoops.
Personally I would be somewhat concern blocking air ducts that BMW engineers had designed based on their R&D.

I do not mean to be dense but what is the anticipated benefit in air flow?

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Old 22nd January 2008, 01:55   #10
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Quote:
Originally Posted by M5Ranger View Post
I am a bit confused here.
First I see the claims of 17 rwhp gain from the RPI scoops. I have a hard time w/ that. There is noway the some fans blowing in front of the car can simulate the actual force of air rushing in thru the air boxes while driving at 100 mph. This applies as I see it, to air intake systems.
I use to have the Gruppe M intakes but I still have the CF piece which sits behind the Kidney grills which funnels air into the air boxes. This appears very similar to the RPI scoops.
Personally I would be somewhat concern blocking air ducts that BMW engineers had designed based on their R&D.

I do not mean to be dense but what is the anticipated benefit in air flow?

M5Ranger
When we designed the scoops, we had no idea of how much hp we would gain. You can ask Deknight and Marshall about that as well. We normally do 3 runs to get an idea of power. We did several runs (18 on marshalls) just to confirm the results,...on several cars. Also, the air/fuel mixture changes instantly when the scoops are installed. Remember, we are changing a vacuum reliant intake system into a ram air set up. This will change the way it was designed.

Here is a graph (air fuel ratio / hp) with and without the ram air scoops.

Last edited by RPIpower; 22nd January 2008 at 01:56.
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