[Winston Wolf]

[QUOTE=sambonator;2567697]Why are power levels so low? I just saw the graphs and concluded it was stock. 272whp...

[QUOTE]

They are that low because a stock 335xi puts out 250 HP at the wheels on a Mustang Dyno. I know that to be a fact as I've done it. I would say it looks spot on for a JB2 and no cats.

[Scott B]

Just to clear a few things up...

1.) Yes, the entire test was performed using SoCal ARCO 91 octane.

2.) Power levels are what they are on this gas, on this car, and on this dyno. The important information to gather is the difference between the curves since all of the tests were done on the same day, back to back.

3.) Under these conditions, with significantly high ambient temperatures, none of the filters outperformed the stock filter. Anyone who gathers that one filter or another performed better than the stock filter by looking at these results is mistaken, in my view.

4.) Four runs were done per filter. This allows for proper adaptation for these filters, if any is taking place at all. Three runs were done per filter on Round 1, and the last run was the best for each filter. During this test, the first run was nearly always the best. This fact is related to the ambient temperature difference between Round 1 and Round 2, in my opinion. Tighter control of the testing procedure, with regard to the oil temperature starting method, was also introduced in Round 2.

[jcarlucci1]

Originally Posted by fedinand

Looked like the BMC performed the best to me....

Bmc performed the worst..look at the 3 bmc runs(dotted line) all three runs were quite a bit below stock, then look at the bms runs, you see an improvement over much of the power band, although not necessarily peak hp, ..that being said, I do not understand how a higher flow drop in can possibly lose so much power compared to the stock filter..

[stressdoc]

Nice test!!!

My bet is that a clean new filter will outperform a dirty one. And to take advantage of increased air flow provided by different filters/intake arrangements, you need a specific tune and other adjustments. The OEM filter works as well as anything on a more or less stock car. With a radical tune, catless DPs, & free flow exhaust, the OEM intake may become a bottleneck.

[Dan335i]

I can see this thread going about 100 pages long.

[stressdoc]

Originally Posted by Dan335i

I can see this thread going about 100 pages long.

It's got data!!!!

[radgator1]

Excellent testing (better than the first round) and interesting results. At least the BMS sounds good and has shown good results in the real world (track). With more boost BMS or Dual cones will start to show better results compared to any of the drop ins IMHO.

BTW, I wouldn't put ARCO gas in my car but thats my own personal bias

[Scott B]

Originally Posted by radgator1

BTW, I wouldn't put ARCO gas in my car but thats my own personal bias

I don't normally use ARCO either. The car normally gets 91 from the 76 Station. However, I was low on gas just before the testing was to start and needed to fill up at a place nearby, so ARCO it was.

[tomtom]

This is on a stock car....I wonder how the filters would compare on a tuned car.

[Winston Wolf]

Originally Posted by tomtom

This is on a stock car....I wonder how the filters would compare on a tuned car.

JB2=stock?????

[LOLrance]

Originally Posted by tomtom

This is on a stock car....I wonder how the filters would compare on a tuned car.

read much?

Test Vehicle: 2008 335xi E92 6AT with JB2 and no secondary cats

[ulises 335i]

Originally Posted by Scott B

I don't normally use ARCO either. The car normally gets 91 from the 76 Station. However, I was low on gas just before the testing was to start and needed to fill up at a place nearby, so ARCO it was.

When im too low on gas to the point where it says like 5 miles to go and theres only shitty stations around , i only buy 1 gallon of gas till i see a shell of chevron and then i fill it up.

[E82tt6]

Solid line is stock, or dotted line is stock?

Interesting that the 'hot air intake' BMS setup didn't lose power, even with 90+ degree ambients, and the hood closed. It would have been interesting to see a pre-turbo IAT probe, to settle the "flow vs temperature" argument that's been rehashed on here 3x10^8 times. Please don't argue about it again. I'm just saying it would have been interesting to see.

[jcarlucci1]

solid is stock

[Dan335i]

Originally Posted by stressdoc

It's got data!!!!

I meant it in a positive.Excellent info imo,and i would love to see this type of thing going on.

[hellrotm]

Originally Posted by E82tt6

Solid line is stock, or dotted line is stock?

Interesting that the 'hot air intake' BMS setup didn't lose power, even with 90+ degree ambients, and the hood closed. It would have been interesting to see a pre-turbo IAT probe, to settle the "flow vs temperature" argument that's been rehashed on here 3x10^8 times. Please don't argue about it again. I'm just saying it would have been interesting to see.

Hot Air Intake BMS setup I like that. I will never be convinced that sucking in hot air doesn't matter. Yes there is larger volume of air being sucked in, but the heat soak. Cooler denser air going into the IC can only help.

[hellrotm]

Anyone on here dyno the Ulimate Racing Cold Air intake? To confirm UR's claims.

[3thirty5]

wow! i'm really suprised the Helene did so poorly! when compared to how it did in the first round of tests. Any idea why such a dramatic difference in performance from the same filter?

[KWA VaTech]

Originally Posted by who's ur daddy?

What about adaptation?

Also, perhaps the better indicator is the 1/4 track instead of a dyno with fans.

But overall, I am impressed with the effort. Kudos to you for providing impartial evidence for the N54 community.

1/4 time will tell you nothing, too much error involved. I doubt you would need a lot of adapting for such a small change.

[mJ335]

Damn.. so I guess it was my mentality that my car felt slightly quicker in throttle response (therefore faster) with my BMS filter.. oh well.. at least the sound is lovely.

[mjd]

Thanks OP... nice to see a well conducted test w/ data.

[BattleWagon]

Originally Posted by stressdoc

Nice test!!!

My bet is that a clean new filter will outperform a dirty one.

That is a good point that many do not take into consideration. Before anyone can conclude that the stock filter performs just as well as these aftermarket high-flow filters, you have to take into account the following points:

1. A clean stock filter will indeed flow well
2. A stock filter will experience exponential increases in restriction levels once it starts to load up with particulates. This happens soon as the holes are so small in paper filters.
3. Aftermarket oiled cotton media filters will experience linear increases in in restriction levels once they start to load up with particulates. Debris is entrained in the oil solution as opposed to clogging small holes.
4. Aftermarket filters (i.e. Streamline, K&N) will flow better longer then the the stock filter so diminishing gains do not happen as fast or drastically as the stock filter.