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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 > Dyno Runs--DCI vs OEM air box (Hood Closed)



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      08-07-2009, 06:59 PM   #1
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Dyno Runs--DCI vs OEM air box (Hood Closed)

So I went to MD Automotive today because it was bugging me about the intake vs OEM air box discussion that we had recently.
It occurred to me that nobody dynos with the hood closed when testing an intake. It was bugging the crap out of me because I keep hearing things like, "Wow, all I did was put on the dual cones and I gained 15 hp" or "What are you doing using the stock air box still? You should be using dual cones."

First off, here are my mods:

-JB3 Map 3
-Active Autowerke Intercooler
-Autobahn Exotics Exhaust with HFCs
-Ultimate Racing catless DPs

So this is what I did today:

-I compared a dual cone setup with the OEM airbox with the AFE filter. Both setups were using AFE scoops.
-I did 3 runs with each setup.
-Each dyno run was done with the hood closed using the huge fan. I don't know exactly but I was told that it was a 100mph fan, but realisticaly, once the air actually enters the car and the air ducts, it's most likely hitting the car at 60 mph.

Between each run, I opened the hood and let the fan cool off the engine bay for 5 minutes. This was done with both setups.
The DCI setup was done first because I didn't want there to be any comments like "the reason why the DCI didn't do well was because the DCI was used after the OEM air box" bla bla.

I was actually surprised with how well the DCI setup did for the first run, but thinking about it after the fact, I honestly feel that the AITs of the DCI were lower in the first run due to the engine not being up to normal operating temperature. This is why I believe that the AITs of the OEM air box were higher than the DCI with the first run.

The first graph is the 3 runs with the DCI.
The next graph is the IATs of 3 runs of the DCI.
The 3rd graph is the 3 runs with the OEM air box.
And then the IATs of the 3 runs.

I graphed the best run of each on the 5th graph and then the worst run of each on the 6th graph.

Here's my summary...
I know that it's hard to duplicate real world conditions on a dyno, but I honestly think that it's more realistic with the hood closed.

Use A DCI if...

-You want to get a good 1/4 mile time at the strip.
-You want to impress your friends with dyno numbers.
-You like the sound of the whooshing noise.

Use the OEM air box if...

-You want something that is consistent.
-You drive on road courses/autocrosses.
-You like the OEM look.
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      08-07-2009, 07:12 PM   #2
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Looks like a good test..... Interesting numbers there for sure.... very interesting....

The IAT seems to only be 5 degrees higher than the stock box on the last run...

Look at that heat soak though, wow...

Its a hard call

But it looks like the stock box is almost better for the street!

The stett did better than the DCI, yes?
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      08-07-2009, 07:15 PM   #3
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So, it does make a different?
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      08-07-2009, 07:23 PM   #4
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what are the last two dyno plot graphs?
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      08-07-2009, 07:27 PM   #5
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Quote:
Originally Posted by mwahlert View Post
what are the last two dyno plot graphs?
The first of the 2 is the best of each. (DCI is Better)
The second is the worst of each. (OEM is Better)
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      08-07-2009, 07:29 PM   #6
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what other mods do you have?
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      08-07-2009, 08:00 PM   #7
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Same ?

Quote:
Originally Posted by Borsig View Post
what other mods do you have?
Tks for this I was thinking the same thing ...I was really thinking theres not much of a gain for the cost... if it looks and sounds ya ...for sure but if its 1/10s your lookin for not much for the $$s
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      08-07-2009, 08:02 PM   #8
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Quote:
Originally Posted by Borsig View Post
what other mods do you have?
The runs were with JB3 map 3, AA IC, AE HFCs, and UR catless DPs.
I edited the initial post.
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      08-07-2009, 08:11 PM   #9
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So im good right now cuz with JB3 map 7 and no other mods IATs matter alot. So i cant afford the higher IATs for a few extra HP. Also i have a lead foot and i drive very "aggressive" i think if i do alot of driving around say on a Saturday night i'd end up losing power rather than gaining.

I'd love to see the same comparison with the STETT also i'd love to see you run a Higher map on the JB3 and see the results under higher boost. Say a map6 or 7

all in all great job. i appreciate the tests.
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      08-07-2009, 08:38 PM   #10
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Thanks for showing us your testing Mr.5 Your findings are not surprising at all. You should of added more boost and seen the differences which should theoretically grow between the two.
You will also see a completely different picture between the IAT's.
As a side note fan speed is measured at the cowling of the fan. Drive the car at 60mph and try open the door or stick your hand out the window. Its very hard for a dyno to duplicate that. On the road the Stock Airbox will benefit less from under hood temperatures than the dual so the difference in gains might be marginally better than your test.
All in all I am very close to installing my stock box again. Most importantly for peace of mind of its filtering capabilities, its reliability and the fact that I most often running less than 14.5psi.
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      08-07-2009, 08:59 PM   #11
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Thank you for the testing.

Do you have any boost numbers to reference? Why the choice of Map 3 which is tamer? Please do not take this as scrutiny as I have some faith in the merits of the stock airbox. But the boost levels on Map 3 are lower and result in less pressure drop than higher maps. Would increased boost result in a greater differential?
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      08-07-2009, 09:07 PM   #12
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Nice writeup, Senior 5 ......

I recently removed my aFe DCI in lieu of the stock air box w/ a Macht Schnell drop-in filter.
The car is definitely stronger and seems to be more reliable in regard to the power delivery now. Once the outdoor temps begin to cool off; I'll go back to the aFe DCI .......
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      08-07-2009, 09:43 PM   #13
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Quote:
Originally Posted by GeorgeSmooth View Post
Thanks for showing us your testing Mr.5 Your findings are not surprising at all. You should of added more boost and seen the differences which should theoretically grow between the two.
You will also see a completely different picture between the IAT's.
As a side note fan speed is measured at the cowling of the fan. Drive the car at 60mph and try open the door or stick your hand out the window. Its very hard for a dyno to duplicate that. On the road the Stock Airbox will benefit less from under hood temperatures than the dual so the difference in gains might be marginally better than your test.
All in all I am very close to installing my stock box again. Most importantly for peace of mind of its filtering capabilities, its reliability and the fact that I most often running less than 14.5psi.
I'll agree that higher boost would possibly make better results but why would I do that if I'm interested in the results with daily driving?
I've already admitted that the cones would be better at the strip.
I'm personally interested in consistency with daily driving.
Another thing...I could have tested a bunch of different scenarios but I didn't have that much time. I think I got what I wanted.
If I would have done the runs with
Quote:
Originally Posted by scalbert View Post
Thank you for the testing.

Do you have any boost numbers to reference? Why the choice of Map 3 which is tamer? Please do not take this as scrutiny as I have some faith in the merits of the stock airbox. But the boost levels on Map 3 are lower and result in less pressure drop than higher maps. Would increased boost result in a greater differential?
Like I said above, I used map 3 because that is the daily driving map.
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      08-07-2009, 09:56 PM   #14
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thanks for taking time to do this test for us ,

im sticking to oem
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      08-07-2009, 10:04 PM   #15
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Good stuff Bro! Time to do some other testing.
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      08-07-2009, 10:06 PM   #16
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Thanks for doing this test. Funny, I just installed my stock air box with the RR scoops. With the Hot temps here in AZ I'll stick with the stock box for now.
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      08-07-2009, 10:33 PM   #17
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Thanks for your effort Mr.5!
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      08-07-2009, 11:02 PM   #18
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Nice job, this is very good research as always.
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      08-07-2009, 11:41 PM   #19
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good tests, well done.

I would like to see this against a CAI too just to round out the tests.
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      08-08-2009, 12:24 AM   #20
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I have always been a fan of the stock airbox...DCIs are just a quick fix that doesn't do well to the car.

And you had an upgraded intercooler ! Imagine what would happen with the stock one...
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      08-08-2009, 02:56 AM   #21
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Look at the heatsoak in the 3rd run with the DCI's...!
And it happened even if Mr. 5, between each run, opened the hood and let the fan cool off the engine bay for 5 minutes!

This is why I built my heat shield:
http://www.garaget.org/?car=156250&image=1485938
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      08-08-2009, 03:01 AM   #22
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Thanks for the write up! Definitely sticking with the stock box.
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