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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > DIY Twin filter intake set-up



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      10-27-2007, 06:09 PM   #23
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Funny you should ask, I just finish loading them on youtube.
Not very good video's since i was alone last night when i did this.

I'll try and make more tomorrow.



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      10-27-2007, 06:20 PM   #24
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wow it sounds pretty loud!
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      10-27-2007, 06:28 PM   #25
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Quote:
Originally Posted by Edman951 View Post
O-cha,
Higher temp doesn't always mean less boost post intercooler.
I guess it depend on the cooler's efficiency.
I'm not sure why your putting words in my mouth. I said

Quote:
Originally Posted by O-cha View Post
Keep in mind with a turbo its not as simple as "The intake temps are higher but the intercooler cools the air anyway." Higher intake temps mean the turbos have to spool faster in order to make the same boost post intercooler. So while yes you removed restriction and probably gained some low end torque, you likely will lose HP especially with a tune.
I was simply correcting the posters simple and inaccurate statement of.

Quote:
Originally Posted by Edman951 View Post
Many will say this will take in the hot air from the engine bay. Sure it will, but the intercooler is there to cool the charge after it gets heated by the compresssor.
Since there are many more factors involved. Factors that I detailed in my above post.




But, if you would like to discuss it in depth. With higher intake temps the only other option then less boost would be for temps post IC to be higher, which is obviously bad as well.

Either the turbos spool the same, compress the same volume of hot air which will result in either lower boost at the same temperature or the same boost at higher temperature.

Or, the turbos spool higher, compress a greater volume of air to counteract the above.

The first is bad either way, and the second is bad because the 335s turbos are already heavily spooled and increasing spool for the same variables is obviously not what you want to do.



Now obviously a decrease in restriction will allow a great volume of air for the same amount of spool. The question is was this decrease enough to counteract the increase in temps or lower boost from higher temps. For that a non butt dyno is needed.
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      10-27-2007, 06:50 PM   #26
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O-cha, not trying to put words in your mouth.

I will not start arguing about temperature vs power output on a turbo car.

We could dyno the same car 30 days staight and it would never make the exact same power or curve. since all temperature variables from each compenent will affect it.
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      10-27-2007, 07:06 PM   #27
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Quote:
Originally Posted by Edman951 View Post
O-cha, not trying to put words in your mouth.

I will not start arguing about temperature vs power output on a turbo car.

We could dyno the same car 30 days staight and it would never make the exact same power or curve. since all temperature variables from each compenent will affect it.
Are there any gains? What other performance mods do you have?
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      10-27-2007, 08:22 PM   #28
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Quote:
Originally Posted by Edman951 View Post
Funny you should ask, I just finish loading them on youtube.
Not very good video's since i was alone last night when i did this.

I'll try and make more tomorrow.



wow sounds great!!!! i may have to do something similar! or just get a ram air system from a manufacter like msds or the stett one coming out
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      10-27-2007, 08:50 PM   #29
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I don't mean to get But

Another benefit with this K&N air filter design is the ability to install the OEM Strut Brace.
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      10-27-2007, 09:33 PM   #30
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wow dude, sounds awesome. No cels?
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      10-27-2007, 11:19 PM   #31
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Good job! Next step is to fabricate a heat shield under the filters. With the cold air blowing on the filters from the stock snorkle it should be just fine at speed.
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      10-28-2007, 12:08 AM   #32
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Very cool! Sounds good.
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      10-28-2007, 06:56 AM   #33
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thanks for scraping the project together. over all it looks great. the stock snorkel would keep the bay cool enough.
And the spool sound is so much better... the DP's I've heard didnt make it as loud as your filters did.


The only thing that would worry me is the boost spikes, which could cause problems....
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      10-28-2007, 11:48 AM   #34
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Quote:
Originally Posted by Edman951 View Post
Hey guys,
I made a home made twin air filter ( K&N) induction set-up on my car last night.
It came out pretty good and simple.
The idea came to me when thinking of finding a simple way to get a K&N filter on my car. And not ad bends to the system since it already got the long pipes to the turbos.
I figure since I got twin turbo's, why not go twin air filter.
Many will say this will take in the hot air from the engine bay. Sure it will, but the intercooler is there to cool the charge after it gets heated by the compresssor.

On my first test drive i got some boost spike that i never got befoe.
This set up did increase boost buy a good 1 to 2 psi. from before and after reading on my boost gauge.
ps. I have a turbo tuner on my car from the M Shop, That I installed last week.
So if the boost went up just from the filters install that means it remove some restriction right.
And I could always box the filters and use the factory cold air inlet.

The factory box seems restrictive because of it design. and the gain in boost does show this fact.

I was lucky that this set-up went in easy, and that my idea and chossen parts worked. Because I designed this without re-moving any part for the car. Just took mesurements and figured what i needed.

Here what i did and used.
Ordered 2 K&N filters part # RX-3800, I wanted X-stream flow tops. And the 20deg angle help on the install.
http://www.knfilters.com/search/prod...x?Prod=RX-3800

Remover air box. To do this you will have to remove the A/C filter system and bulkhead by unbolting it. This is easly done, and will help you acces the rear intake tube clamp/

I used 2 aluminum 2" IPS ( 2.375" OD) pipes I had at my shop that i cut about 1-1/2" long to joint the filter to the factory pipes.

Then bolt on the filters using the pipe adaptors. angle the filter so the don't tuch each other. Re-intall the bulkhead and A/C filter assembly.

I can now hear the turbos spool up and the bypass valves work (not very load do for the valves) but its descrite.

Here are some pictures.
This is really good work with off the shelf parts. You are not going to get much more than 0.5 PSI pressure drop reduction. From a flow point of view all looks good but added heat in the air stream is another matter but this hard to quantify anyway. I suspect you ahead of the stock system in all circumstances.

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      10-28-2007, 12:09 PM   #35
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can you post the aluminum pipe that you used?

edit: i'm sorry i didn't see them in the pictures
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      10-28-2007, 12:54 PM   #36
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Great job man!
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      10-28-2007, 01:30 PM   #37
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hmmmm be sure to report back if you have any problems with this. Interesting.
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      10-28-2007, 02:22 PM   #38
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Ya great job! Now if only someone can build a proper housing so they will pull cold air, and you'd have a winning product!
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      06-23-2009, 04:10 PM   #39
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Bump for an old thread...

This is basically what a BMS dual cone set up is correct?
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      06-23-2009, 04:56 PM   #40
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wow this thread is almost 2 years old and i've never seen it before
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      06-23-2009, 07:10 PM   #41
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Quote:
Originally Posted by TwinTurboXI View Post
Bump for an old thread...

This is basically what a BMS dual cone set up is correct?
yeah but the filters look bigger and don't look like they rub like the BMS set up does
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