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      02-07-2013, 11:16 PM   #23
stealth.pilot
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I've noticed that the car seems to have lower acceleration stats in US magazine tests than in overseas magazine or US magazine tests conducted in Europe. This filter definitely is one factor.
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      02-08-2013, 12:30 AM   #24
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Quote:
Originally Posted by Warehouser
Late Oct build here, and have plates.
Aug 2012 build, no plates but charcoal filters. I removed them and will check the feel tomorrow. Guess I'll have to call dealer and see what's up with getting the plates installed.
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      02-08-2013, 12:37 AM   #25
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I'm personally not surprised by removing the charcoal filters netting a like 15hp gain. With those dang GTR's, all you have to do is change to a high flow air filter and gain like 100hp! Time for us ///M guys to enjoy the benefits of having a turbo engine now!
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      02-08-2013, 01:01 AM   #26
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I'm just here to pass along what I think is good info to fellow members!
Dealer did not comp me for parts and labor and I spent a lot of time going to get it dyno'd.
A member asked if I would pull the charcoal filter and dyno after plates were installed.
I knew my car was running slow during a run we did at high elevation in the canyons as I would have to downshift early to keep the speed up. My shop open up the air box as I wanted to see the charcoal filter and we discovered the holes which he said was strange.
He got in another M5 few weeks later and took picture of the sealed box which I sent to dealer. Overall I'm happy with how the car is running so now just waiting for the right tune.
If you have doubts i suggest you do your own dyno. I'm not here to sell you anything...just sharing my own info
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      02-08-2013, 02:17 AM   #27
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Quote:
Originally Posted by RPiM5 View Post
I'm personally not surprised by removing the charcoal filters netting a like 15hp gain. With those dang GTR's, all you have to do is change to a high flow air filter and gain like 100hp! Time for us ///M guys to enjoy the benefits of having a turbo engine now!
LOL...yeah, IIRC with E60 there were folks seeing 21whp by yanking them!
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      02-08-2013, 02:50 AM   #28
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Much appreciated and what this Board is all about.
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      02-08-2013, 08:17 AM   #29
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Question

Is it safe to say we can just pull the charcoal filters and throw them (put them in a box in the garage) away and drive safely with or without any perceived increase in hp and/or feel?
There is no downside to doing this?
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      02-08-2013, 08:19 AM   #30
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Quote:
Originally Posted by Fly M5 View Post
I'm just here to pass along what I think is good info to fellow members! I spent a lot of time going to get it dyno'd.
Overall I'm happy with how the car is running so now just waiting for the right tune.
If you have doubts i suggest you do your own dyno. I'm no here to sell you anything...just sharing my own info
My thoughts exactly...Congrats on your new numbers.
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      02-08-2013, 09:04 AM   #31
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Thanks Fly M5- I know where 20 minutes of my weekend will be!
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      02-08-2013, 09:21 AM   #32
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So now we need someone to dyno with the snorkel. I unfortunately have a hole in the air box. If I remember correctly, the hole was the only place for the intake to draw air from. If you cover this, where does outside air come from?
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      02-08-2013, 11:07 AM   #33
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Quote:
Originally Posted by Fly M5 View Post
I'm just here to pass along what I think is good info to fellow members!

If you have doubts i suggest you do your own dyno. I'm no here to sell you anything...just sharing my own info
I appreciate your efforts to inform and reporting the multiple dyno runs you've done, thank you. There are many production scenarios we could presume with the various configurations of airbox BMW has delivered to the USA over the last number of months. I've called my dealer here in Michigan and he was able to find the blocking plates (called locking plugs in BMW parts lingo) RT part # 13-71-4-799-886 $140.99 and LT part # 13-71-4-799-887 $140.99 stocked in two USA warehouses and one in Canada for $84.68 each. In his search for the latest airbox configuration he found that the box with the internal 'snorkel' is what is currently specified in his parts fiche. If your dealer sourced his parts from Germany perhaps that is the disparity in cost.

To me it seems that there would be very little difference in HP produced with any of the three airbox designs. More a difference in sound I'd think. The carbon filter though, might reduce airflow enough to add slightly to HP when removed. My car does seem to rev faster without it.

For Tourbillon, there is another intake opening in the front of the airbox.
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      02-08-2013, 11:12 AM   #34
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Quote:
Originally Posted by Tourbillon View Post
So now we need someone to dyno with the snorkel. I unfortunately have a hole in the air box. If I remember correctly, the hole was the only place for the intake to draw air from. If you cover this, where does outside air come from?
There is a duct that lead from the airbox to the front bumper, just like the E60 M5 intake design. If any of you remember, this is why RPi designed their own block off plates for the E60 M5 intakes. There was a hole on the bottom that came from near where the front brakes were. RPi discovered that by covering them with a block off plate, they dyno'd an extra 5hp gain. The hole ends up creating a vacuum effect, thus robbing the air that is supposed to be going into the engine. At least this is how they explained it to me. Seems to make sense. This also seems to be proven now that Fly M5 has blocked his holes off, which I guess eliminated that vacuum effect. But who knows it could be completely something else.
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      02-08-2013, 06:14 PM   #35
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I just took my charcoal filters out, and I have the block of plates. Although i'm not sure how to check the build date. I picked the car up in May 2012 and it has the block of plates.
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      02-08-2013, 06:51 PM   #36
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I did the charcoal filter delete too. Feels peppier and lil louder. But i don't no if I have the plates. I just got my m5 a week ago. So u guys think I have them?
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      02-08-2013, 07:06 PM   #37
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Quote:
Originally Posted by BIG~BLUE~BMW View Post
I did the charcoal filter delete too. Feels peppier and lil louder. But i don't no if I have the plates. I just got my m5 a week ago. So u guys think I have them?
U shoulda just lifted up the filter bro.
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      02-08-2013, 09:59 PM   #38
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Quote:
Originally Posted by MasterDank View Post
...... Without a video of each run with temps, IAT,EGT, Ambient and humidity. Those are really far fetched numbers for the changes made... Tuning and full exhaust are bringing the same kind of numbers as the block off plate. 40 HP from a block off plate that should do lil to no difference on a dyno, with a fan blowing in to the RPI air ducts.. Unless the first run or runs were with no fans or some other change. How can removing a thin layer of filter bring an amazing 15 HP and completely removing the filter or putting on the gruppe M intake only yield the same results. Your first change (Plates) restricts the amount of flow to the filter and the second Removing the C filter helps flow more air.... How do they compound to make more power rather then cancel each other out?...


Sorry to be a skeptic but seems unusual to yield such large results on stock software and to gain TQ and HP both times from opposite changes, seems to good to be true.



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I don't actually think you restrict air to the filter with the plates. If anything you are eliminating HOT air. You are in fact likely to be allowing the box to hold more pressure and thus assisting the turbos with sucking in air more rapidly. There is DEFINITELY noticeable performance difference when you remove those filters. It is not mind-blowing but certainly measurable. The car seems to loosen up a bit. Same was the case on the E60. It does make sense. They are definitely restricting flow. Has to be breathing much better.
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      02-09-2013, 01:13 AM   #39
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Agree with the comments - definitely lower end improvement and slightly better sound when you remove those filters. It's a bit more responsive. Nothing earth shattering but noticeable. I remember the same with my E60 M5. When you put the charcoal filter up to light - you can't see through it. The removal was simple if you follow the directions. It took about 10-15 minutes max.
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      02-10-2013, 08:24 AM   #40
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Quote:
Originally Posted by chillin4now View Post
Is it safe to say we can just pull the charcoal filters and throw them (put them in a box in the garage) away and drive safely with or without any perceived increase in hp and/or feel?
There is no downside to doing this?
No risk at all, you can pull them. They're added to the car just to pass California EPA regs - they are supposed to absorb fuel vapors that travel back up the intake while the engine is shut off. Putting them in all cars makes the M5 "50 state compliant".
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      02-10-2013, 12:08 PM   #41
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Would this tool be suitable for screw #7

http://www.amazon.com/Sunex-9726-Min...sim_sbs_auto_6
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      02-10-2013, 12:33 PM   #42
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Quote:
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Would this tool be suitable for screw #7

http://www.amazon.com/Sunex-9726-Min...sim_sbs_auto_6
That's what I used to remove the screw and it was still difficult to work under the intake duct. Tedious more than difficult, I suppose. I was tempted to pop for this SnapOn piece, but the $52 price was more than I thought was appropriate for something I won't be doing often. The drive set you show has many more uses than the flexible driver and is a good investment.
http://buy1.snapon.com/catalog/item....re&dir=catalog
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      02-10-2013, 12:41 PM   #43
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I have done this on both my f10 m5 and f12 m6... both cars "feel" quicker off the spool and seem to be very slightly more aggressive on throttle in runs from 60 to 150mph. I also lifted up my stock air filters and both my cars have the plates. You can check your build date of your cars on the door jam (not sure if mentioned) and both of mine are 08/2012.
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      02-10-2013, 02:41 PM   #44
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Quote:
Originally Posted by stealth.pilot View Post
Would this tool be suitable for screw #7

http://www.amazon.com/Sunex-9726-Min...sim_sbs_auto_6
Very similar to what I used...
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