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      02-18-2010, 06:23 AM   #1
dadoke
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Loud aFe Cold Air Intake

A couple of days ago I installed an aFe Cold Air Intake on my 07 3.0si, this one: aFe 54-11602

At idle revs or below 3000 rpm you can hardly hear any difference but above 3000 rpm the sound becomes deeper.
I am definitely satisfied of the sound of the intake (especially when accelerating), I don't feel an increase in power, but that wasn't why I bought one.

Only when driving at constant speeds on the highway (cruise control) at a constant speed between 3000 and 4000 rpm, the noise is a little bit too much.
It's a monotonous sound that overwhelms everything, once above 5000 rpm the sound level is acceptable again.

So my question; can someone explain why there is more sound between 3000 and 4000 rpm than in the higher revs?
Or even better, does someone know how to make the intake a little less noisy?

On the net I found some things about intakes:
- the shorter the intake tube, the more sound (the aFe intake is exactly the same size as OEM).
- at only one site the aFe intake was described as loud
- a smaller air filter would be quieter

I suppose I installed everything correct, but just to be sure I will check tonight and do a test run

Last edited by dadoke; 02-18-2010 at 06:31 AM..
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      02-19-2010, 09:03 AM   #2
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Depends on the source of the increased noise I guess. The new filter and/or intake box could be less noise-isolating and allowing more of the valve/engine noise to travel up the intake trumpets. Or, the new intake box could simply be vibrating and producing noise (even when connected properly). Or, you might have a loose screw or something! But, if the filter is in place and everything is tightened properly and you have a proper seal overall, and if you like the sound, I wouldn't really care about the why part as much...
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      02-22-2010, 09:43 PM   #3
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I'm looking into the aFe intake for an 07 3.0si.
I wanted to ask if you would recommend the CAI from aFe?
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      02-25-2010, 09:17 AM   #4
dadoke
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Quote:
Originally Posted by BossE86 View Post
I'm looking into the aFe intake for an 07 3.0si.
I wanted to ask if you would recommend the CAI from aFe?
It's a nice product (well-made i mean), and the installation is pretty easy, but for daily use it is a little too loud for my liking ... so i deinstalled it after a week.
The thing i noticed afterwards is that between 3 and 4000 rpm the car was already louder than at higher revs. I suppose the afe intake is louder at all revs, and that it's just the characteristics of the car that it is louder between 3 and 4000 rpm.
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      02-27-2010, 03:38 PM   #5
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aFe Intake on my E86

I installed the aFe intake on my 06 Z4 M Coupe and after a day of driving with it, I took it off. I felt I loss power but couldn't confirm it. Since then, I had an ESS tune (which I LOVE!) and was thinking about putting back the aFe system but also thought about calling aFe and asking them if I might've installed the sensor 'backwards' as an afterthought because I can't believe they would sell a system that didn't increase power . . . especially for the price they sell them for.

Here's a link to another forum that discusses a 'loss' in power: http://www.m5board.com/vbulletin/e60...no-review.html

Maybe I should go looking for waterfront property in Arizona instead??
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      03-01-2010, 02:46 AM   #6
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I was going to order the AFE stage 2 intake, but it seems like it's worthless.

Time to invest on the Gruppe M I think...
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      03-01-2010, 09:51 AM   #7
dadoke
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Quote:
Originally Posted by Maroon View Post
I was going to order the AFE stage 2 intake, but it seems like it's worthless.
Time to invest on the Gruppe M I think...
the Gruppe M is definitely the better looking intake, but for about the same price you can get a ECU tuning which gives you 20HP+ more
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      03-01-2010, 10:41 AM   #8
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Quote:
Originally Posted by dadoke View Post
the Gruppe M is definitely the better looking intake, but for about the same price you can get a ECU tuning which gives you 20HP+ more
Where can I get this??
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      03-01-2010, 11:10 AM   #9
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Quote:
Originally Posted by Maroon View Post
Where can I get this??
esstuning.com but it's more like 7hp and a lot smoother curve
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      03-01-2010, 02:42 PM   #10
dadoke
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Quote:
Originally Posted by Maroon View Post
Where can I get this??
i don't know where you are from, but here in Belgium there's a company that does good work doing ecu-tuning, here's a list for all BMW's : http://www.power-plus.be/pdf/bmw.pdf

For the Z4 3.0si it would be 24HP+, Z4m 21HP+
And ofcourse they do some dyno-runs to verify the result
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