07-12-2019, 11:10 PM | #1 |
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M2C missing part of intake piping.
I added some RPI Air Scoops thinking they would attach where the holes are next to the radiator. Guess what? No holes! On my car the extension piece is attached coming out of the airbox but not the elbow to connect them to the front open grill area.
So each side of the intakes have part #11 attached to the filter housing. Parts 13 and 14 are not on the car. Where the grill (P14) attaches there are no holes. It looks like BMW ditched these because the Light assemblies impede on the elbow some. I cut away where the holes should be after looking a nearby M3. Then made my own elbows out of old plastic containers. I finished it all off with Blk duct tape to create a closed intake. There are also holes on the outboard side of each Part 11. I was able to close those up thus getting cold air from the front grill only. With my AK Motion reading IAT's I went from 20-25 degrees over outside air temp to 10-15 over at any decent speeds. Even less at 75+ MPH If all the M2C's are the same then your sucking in hot air from the engine compartment. Best,.. HAZMAT
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07-13-2019, 10:21 PM | #2 |
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Yup! I grabbed the wrong blowup.
For what I'm explaining the 90 bend and the neck it attaches to are not on my 2020.
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07-15-2019, 03:02 AM | #3 | |
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Quote:
https://www.babybmw.net/forum/viewto...t=intake+grill
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10-24-2019, 12:03 AM | #4 | |
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Thanks for pointing this out, I just checked my car and I was also surprised to see that there are no air inlets behind the kidney grills as well!! I analyzed the front bumper thoroughly and it seems the intake sucks air from narrow inlets perpendicular to the oil cooler. Now I understand why you cut holes behind the kidney grills, I wonder why BMW ditched the inlet elbows on the M2c. Did you try fitting the M4 elbows? Can you please share some pix of how you did this?? I took a pic inside my grill to make it clearer for everyone and check out the M4 intake elbows from realoem.. Cheers Last edited by Alfy; 10-24-2019 at 04:42 AM.. |
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10-24-2019, 08:16 AM | #5 | |
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10-27-2019, 10:58 PM | #6 |
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I don't believe so. I had a M4 right next to my car in the shop and the headlight assemblies are closer to the grill area on the M2c than the M4. I think they didn't want to spend a few bucks more fabricating a smaller set of elbows to fit in the smaller spaces.
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10-27-2019, 11:17 PM | #7 | |
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If you look at the available space between the airbox intake tube front end (right next to the headlight) and the radiator ducting, there isn't very much room to turn 90 degrees. It looks like the short RH elbow from the M4 might work on the M2C, but certainly not the long M4 LH elbow. You could possibly get creative and flip the M4 short RH elbow upside down and put it on the LH side of the M2C, thus using 2 M4 LH elbows but flipping one to make it face in the correct direction but that remains to be validated. |
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10-28-2019, 12:26 AM | #8 | |
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So if the RH elbow fits the OG M2 then it should definitely fit the M2c!! The discrepancy seems to be the LH elbow, it would be cool if a tuner can develop them. Check out the diagram comparison from realoem Last edited by Alfy; 10-28-2019 at 12:38 AM.. |
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10-28-2019, 03:45 AM | #9 | |
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To the person that carried out the mod A) how and B) engine temps? The M2C was meant to have cooling "issues" over the M2/M4 that is why I mention it. M2C also has less frontal area than M4 and is missing the side gills for evacuating hot air. |
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10-28-2019, 04:10 AM | #10 | |
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It would require a lot of trial and error with the bumper removed to make a perfect fit. I miraculously managed to take a pic of the LH existing intake nozzle through a very tight opening from the engine bay and outlined in red. Notice how the path underneath the intake nozzle is blocked with the chassis arms. God knows how the air is being channeled upwards to feed the intake... |
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10-28-2019, 08:22 AM | #11 | |
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Once you've removed the radiator upper support, you remove the airbox assembly and you can wiggle the intake snorkel out and measure or test everything you want. |
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10-28-2019, 08:36 AM | #12 |
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Here's the finished process for anyone interrested.
The good: the RW Carbon scoops (made for the M3/M4) fit with only minor adjusments to the M2C and I now have fresh air fed directly into the area where the airbox snorkels live. The bad: On the M3/M4 platform the scoops feed directly into the elbows, but that can't happen on the M2C without "special" elbows because the scoops end up being higher than the snorkel by about 2 inches. The scoops certainly function when the car is moving forward, but not so much when the car is stationary. |
10-28-2019, 09:18 AM | #13 | |
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Why did you remove the intake snorkel when installing the scoops though, I'm assuming that you also installed an aftermarket intake at the same time of the RW scoops installation? |
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10-28-2019, 09:39 AM | #14 | |
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I removed the snorkels because there's an opening in them that lets hot engine bay air into the intakes and I wanted to block this off. Call me anal but I really can't understand why BMW did it this way. I just cut a piece of plastic and used double sided tape to hold it in place. See attached. I also attached a picture showing where the scoops exit relative to where the snorkels live. WRT to intake, yes, I'm using an Eventuri intake on my M2C. It retains the snorkels and attaches to them. |
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10-29-2019, 10:39 AM | #15 | |
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Did you notice lower IAT's after this upgrade? |
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10-29-2019, 01:22 PM | #16 | |
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Let me know if you decide to go with RW Carbon scoops (same as me), there's a small modification you need to do to the mounting brackets. I'll post a picture if needed. |
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10-29-2019, 01:33 PM | #17 |
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I'm gonna go with your exact setup, what did you do to the bracket to make it work??
Can you also post a pic of your front end slightly zoomed out, I would like to see how the scoops line up with the vertical elements of the kidney grill |
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10-29-2019, 04:52 PM | #19 |
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IAT's are hard to get an accurate measure on. At idle there is very little difference in IAT's. Heat Soak on the intake air and parts...
But as speed increases so does the drop in IAT's I monitored the IAT's over a several day period before doing the mod. I looked at the delta between outside air temp and IAT's to determine this. IMHO there's about a 8-15 degree improvement with the modification at any significant speed. That's a conservative estimate.
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10-29-2019, 05:06 PM | #20 |
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Wow! Ive been trying to wrap my head around this, and you guys are absolutely right... I found the snorkels and they basically feed air from... nothing. So the secondary holes in the side of the snorkel must have been added because there are conditions where the snorkel itself had inadequate air flow.
Kudos to all of you for figuring this out and cutting those holes behind the grill. Would be interesting to play with a 3D printed "S" mold to channel air from the grill to the snorkel. Lots of work... but Im going to patch those side holes and at least open a hole behind / next to the grill.
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10-29-2019, 05:48 PM | #21 | |
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10-29-2019, 06:18 PM | #22 |
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Besides colder IAT I reckon there's more air getting into the intake as well, more velocity. Anyone have a white paper on airflow?
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