10-05-2021, 04:35 PM | #1 |
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▀▄ eas | DIY: S58 M3/M4 BMC Filter Installation
Featured on BIMMERPOST.com The OEM intake system is very good from factory and leaves very little to be improved upon, other than filtering media which consists intake air flowing past (2) sets of filters, one paper and one charcoal. Filters contribute to generally any gains claimed by aftermarket intakes, at a much lower entry point delivering approx ~10whp and slightly more spool noise from the turbos and can be installed in about 20 minutes. BMW airboxes are generally fantastic in stock form and not at all restrictive for normal street power levels - but the filtering media can be definitely improved upon. BMC air filters are produced using a full molding system that enables the characteristic red filter to be realized from a single mold with no welded joints, thus avoiding easy breakage. The rubber used in BMC air filtering systems has a long life, is very durable and has optimum adhesion characteristics to all shapes of airboxes. BMC filters are made of a multi-layered cotton gauze soaked with low viscosity oil covered with an epoxy coated alloy mesh to ensure protection from petrol fumes and oxidization due to air humidity. All BMC air filters are pre-oiled, and they can be washed and regenerated by using an appropriate regeneration kit. BMC Filters are compatible for both S58-equipped G8x M3/M4, including Competition/XDrive. Installation BMC S58 High Performance Replacement Air Filters (set of 2) https://europeanautosource.com/bmc-h...r-filters.html Tools needed T25 Torx driver Pocket screwdriver 13mm & 16mm Wrench (socket) Installation 1. Remove Strut Tower bolt (13mm forwardmost bolt, 16mm nuts on top of strut tower) 2. Remove Strut Tower Brace 3. Remove T25 torx screws from stock airboxes (4 each airbox) 4. Repeat on passenger side airbox 5. Remove airbox lid 6. Remove charcoal liners with a pocket screwdriver (removed in photo) and discard. Repeat on passenger side. 7. Remove stock air filters and discard. Repeat on passenger side 8. Install new BMC filters into place, filters are marked for left and right sides 9. Reinstall filter lids 10. Reinstall strut tower brace and enjoy your newfound power Torque Specs Airbox: Snug to fit/hand tighten Strut tower brace 18-20lb-ft. Enjoy! Feel free to respond to the thread with any questions.
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Tom G. | european auto source (eas)
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10-05-2021, 05:37 PM | #3 |
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You are able to lift the lids to gain access to the filters without removing the intake tracts - but you can remove the lid also, it's only held on by a single worm-type clamp.
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10-05-2021, 05:57 PM | #5 |
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We find it's much easier to access underneath the lids with the brace removed. Only takes a couple of extra minutes.
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10-06-2021, 12:21 PM | #8 | |
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Quote:
X3M & X4M have a different airbox, which uses 4 filters instead of 2.
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Tom G. | european auto source (eas)
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10-06-2021, 03:01 PM | #9 |
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Can we see some before and after dyno runs?
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10-06-2021, 04:23 PM | #10 |
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That's a great suggestion!
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10-06-2021, 05:04 PM | #11 |
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Didn't dyno after this install, but expect results to be about the same ~10whp we see on the S55.
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10-06-2021, 05:43 PM | #12 | |
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I'm generally skeptical that an air filter replacement can realistically deliver meaningful increases in output. (If it were so cheap and easy, why wouldn't the manufacturer do it from the factory?)
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10-06-2021, 06:17 PM | #13 | |
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Quote:
You can see links to S55 dynos here, as the DME is making incremental gains from each run: https://f80.bimmerpost.com/forums/sh...1#post16507069 The paper/charcoal liners are due to emissions requirements, while the gains are contributed to a combination of having freer flowing media (oiled gauze) and elimination of the charcoal filters, with a small amount of turbo spool noise thrown in. Also the added bonus of never having to purchase filters ever again, as the filters can be cleaned and reoiled every 12K-15K mi.
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10-06-2021, 07:00 PM | #14 |
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Can we just remove the charcoal liners and keep stock filter ? Does that do anything
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10-06-2021, 09:38 PM | #17 |
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This was my car in the shots and I was literally blown away by the difference the BMC made. When I drove home, I forgot I had the filter installed (mainly focusing on my new springs EAS installed). Once I got to the freeway on-ramp and hit the gas hard in 2nd gear, the car fishtailed while traveling in a straight line. I've put 6k miles on the car and it's never done this before the filter install. Never. During a turn-yes, but not traveling straight. I replicated this 3 separate drives again and just can't believe the added bump in responsiveness this filter gave the car. More midrange sound as well which was not present before.
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10-06-2021, 10:32 PM | #18 |
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10-06-2021, 11:45 PM | #19 | ||
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Quote:
Quote:
Haven't had a G8x on the dyno yet, but anyone in the area is more than welcome to drop by and schedule one. I'll be more than happy to share results.
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10-07-2021, 12:41 AM | #20 | |||
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Quote:
Quote:
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10-07-2021, 10:52 AM | #21 | ||||
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Bigger gains are to be had when tuned obviously.
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10-07-2021, 12:23 PM | #22 |
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Yes, S58 is very similar to S55 (flame suit on). Simple fact - more air = more power.
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