10-17-2019, 02:04 PM | #1 |
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max bhp from stock filter?
Hi,
Does anyone know the max bhp that the stock filter is good for? Is Bm3 stage 2 ok with the stock paper filter? I do have an oiled foam drop in at the moment, but considering going back to the stock item to maximise engine protection. Thanks. |
10-17-2019, 02:30 PM | #2 |
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Go with something like an AFE 31-10266 dry panel filter. Great protection and flow, no oiling.
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10-17-2019, 03:50 PM | #3 | |
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I recommend upgrading it for a better air flow. that being said i doubt you would have any issues with stage 2
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10-17-2019, 04:39 PM | #4 | |
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But overall with the stock turbo your limiting factor is likely the turbo inlet way before the factory air intake and filter begins to be a limiting factor. I'd say if you had an upgraded turbo that's when you'll start having the oem intake as a bottle neck but even then it won't be that much.
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10-17-2019, 06:24 PM | #5 |
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Ditching the charcoal liners and installing a set of filters is worth about ~8-10hp. Here's a build we had on the dyno just reaching 800whp on an M3 (S55) with stock airboxes (BMC Filters) and cooling system
Obviously, results will be different on N55. As for filters, BMC or nothing. |
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10-17-2019, 06:35 PM | #6 | |
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From what I have seen gains only come when you're flowing alot of air which comes when making substantial amounts of power something not seen on a simple stage 2 tune and stock turbos. Filters won't offer much of a gain for the N55 since the air box tube is tapered about 30cm past the air box when it is running parallel with the intercooler. So when the N55 intake does come restricting it is the whole unit itself not really the filter. I heard BMC does make some nice filters, but its ~$125 for an m2 drop in filter which is more than half way (~$100) from an entire cold air intake replacement so personally I dont think it's worth it.
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10-17-2019, 06:55 PM | #7 | |
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The quality of BMC filters are fantastic when compared to others, especially in media and bleed/wick areas. Pure also offers a modified inlet pipe to get rid of the restriction. |
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10-17-2019, 07:11 PM | #8 | |
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Yeah BMC makes good stuff, all the Porsche guys love them from what I hear, but it's not worth getting a drop in filter over a full intake IMO. But with the stock turbo and even with an upgraded stage 2 turbo I don't really think there is a need to upgrade the stock intake. Speedtech's development F30 is running the factory intake and they're still making great power. The pure inlet will remove the turbo inlet restriction which is the main restriction even with a stock turbo, but when you have an upgrade turbo (likely stage 3's since I have seen a few PS2 guys at 25psi say intakes still dont offer much benefit) and flow enough air the stock intake tube itself is a restriction. The area im referring to the the stock intake body where the rectangle that is post MAF tapers down. You don't normally see this taper when the intake is in the car since it occurs in the Z axis if you look straight down on the intake while it's in the car and define X as horizontal (head light to head light) and Y as the vertical axis (going to the front and back of the car).
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10-18-2019, 12:44 AM | #9 | |
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10-23-2019, 02:39 AM | #11 |
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10-24-2019, 12:38 AM | #12 |
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10-24-2019, 01:39 AM | #13 |
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Yes thanks for posting this, finally this can be put to rest that drop in filters don't yield power gains even on a tuned car.......
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10-24-2019, 02:08 AM | #14 |
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10-24-2019, 02:27 AM | #15 | |
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There was a really good dyno comparison on n54tech but I can't find it anymore, I don't know if the photos were taken down or if the hosting site stopped sharing it.
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02-11-2020, 01:21 AM | #16 |
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02-11-2020, 02:03 AM | #17 |
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The comparison between the Crosstrek and the m2 isn't even remotely similar. First off the crosstrek is naturally aspirated vs. a turbo charged m2, next the airbox design is completely different with the M performance or M variants of the n55 having an additional opening on the airbox for more air flow, and the crosstrek also has a charcoal filter whereas we do not.
The main restriction on our cars is the turbo inlet where it tapers down like crazy, whereas on the naturally aspirated Crosstrek the car would benefit from a higher flowing intake. You can go look on the forums there are people who have dynoed the n55 without a filter in it and have seen no gains. Even in this video the Crosstrek barely gained anything.
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02-11-2020, 02:28 AM | #18 |
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You said "drop in filters don't yield power gains even on a tuned car" not "a tuned M2" and 2-3% isn't what I'd describe as "barely gained anything." But whatever. Argue on the internet some more.
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02-11-2020, 02:59 AM | #19 | |
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The percentage is deceiving because in the case of a low horsepower car like the crosstrek, 2-3% is only ~2 horsepower. If there was data for atleast 3 runs on each filter you could calculate standard deviation and see if this gain was statistically significant. This would be a more accurate way of measuring power gains, and if it was actually valid. I have my doubts it is actually significant, and it could be run to run variances as the car gets hotter or has more time to cool down between runs, there are so many variables involved. Overall my post was regarding the m2 and the n55 motor where there is evidence that the stock intake is not the limiting factor. Whether or not you buy an intake is up to you, just dont expect a 25 whp gain. I personally buy an intake for the sound.
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02-11-2020, 12:36 PM | #21 |
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+1
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02-11-2020, 03:13 PM | #22 |
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100hp on a butt dyno...
Real life 1-2 maybe 3 HP
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