Obioban's 2001 LMB M5 DD project - Page 6 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #51 of 541 Old 7th December 2013, 05:01 PM Thread Starter
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Quote:
Originally Posted by TopEnd View Post
You make some valid points. However, if BMW wanted to make a the M5 with twin mufflers and a spare they definitely could of achieved that. Look at the w211 E55, Twin mufflers, rear battery and a spare. The design team, based most of their work on the E39 540i (which BTW is a great car with a FULL SIZE SPARE), and instead of engineering a solution to maintain both twin exhaust and spare, decided to go with power over a spare.
Yes i said it, power over a spare.
You mentioned that the twin exhaust was "form over function." I respectfully disagree. The S62(as you know) has 2 banks. it is not in-line like the s54. In theory, the less restriction of airflow to the mufflers, the more power the car will make. Adding back to back 45degree pipe bends, to join exhaust banks, making it a 1-exhaust setup, is something they were trying to deviate from with the 540i and that would of been pedaling backwards.. Does the twin exhaust setup yield BIG power. I doubt it. But i'm sure they needed all the power the could get naturally, as i'm sure the higher ups at BMW had certain power parameters that had to be met. Could they have taken the time to make a spare work. YES.
Form over function. No.
Style over substance. No.
If I met a member of the design team I would ask. Why didn't they take the time to fit both exhaust and spare? It bothered me then in my E39 M5 (especially after getting a flat in the freezing cold) and it bothers me now in the M6, but i am looking into a lightweight inflatable spare and compressor setup that would not alter the space in my trunk.
I find that theory dubious. BMW converted all of their M cars simultaneously to quad exhaust, at the expense of spare, and at the time the only one that wasn't an inline 6 was the e39. Seems to me like a style based decision. I've never seen any evidence than the 540i muffler is more restrictive than the M5's.

The e46 M3's exhaust system is one of the most free flowing systems BMW has ever fitted on a production car, and from an exhaust function (pipe routing) perspective it's a dual.

The M5 exhaust isn't that free flowing stock-- my 03 M5 has intake/tune/exhaust (evolve headers, supersprint catted S pipe, supersprint x pipe, supersprint street muffler) and is up 75 hp vs stock. That's a TON of gain, most of which is just from exhaust components (and a tune to take advantage of them).

Color me jaded
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post #52 of 541 Old 8th December 2013, 02:14 AM
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Quote:
Originally Posted by Obioban View Post
I find that theory dubious. BMW converted all of their M cars simultaneously to quad exhaust, at the expense of spare, and at the time the only one that wasn't an inline 6 was the e39. Seems to me like a style based decision. I've never seen any evidence than the 540i muffler is more restrictive than the M5's.

The e46 M3's exhaust system is one of the most free flowing systems BMW has ever fitted on a production car, and from an exhaust function (pipe routing) perspective it's a dual.

The M5 exhaust isn't that free flowing stock-- my 03 M5 has intake/tune/exhaust (evolve headers, supersprint catted S pipe, supersprint x pipe, supersprint street muffler) and is up 75 hp vs stock. That's a TON of gain, most of which is just from exhaust components (and a tune to take advantage of them).

Color me jaded
Speaking with experience with 4-e39s. 1-m5 and 3-540i/6. I had a 540i with a true M5 exhaust done in my ownership, trust me the stock 540i is more restrictive than the original exhaust. As soon as it was was fitted the difference was noticed. Was it worth cutting my wheel well? Hell yea, at the time i was 19 and i felt accomplished. Fast forward 9 years and I realize that yea it was cool but I could of explored way more options in order to maintain my spare. Listen dude, you have a good thread here and I dont want to stray it away with exhaust fundamentals. Anyone can slap bolt on exhaust systems and flash on any car, but the fact remains that pipe bends on a restrict airflow. Putting a 540i exhaust on a M5 would of and still would be plain illogical on a M5.

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-TBD
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-TBD
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post #53 of 541 Old 8th December 2013, 02:27 AM Thread Starter
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If I were to do it (I'm not), I'd use a supersprint e39 540i muffler, which almost certainly flows better than the stock M5 exhaust.

I would be interested to know how much power you gained from the M5 muffler retrofit on the 540, though-- any dynos?

My point with my 03 gains was merely that the stock exhaust system isn't a poster child for free flowing.

Last edited by Obioban; 8th December 2013 at 02:51 AM.
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post #54 of 541 Old 8th December 2013, 07:18 PM
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Quote:
Originally Posted by Obioban View Post
If I were to do it (I'm not), I'd use a supersprint e39 540i muffler, which almost certainly flows better than the stock M5 exhaust.

I would be interested to know how much power you gained from the M5 muffler retrofit on the 540, though-- any dynos?

My point with my 03 gains was merely that the stock exhaust system isn't a poster child for free flowing.
And which factory high performance saloon comes out the box with an exhaust that is 100% free flowing and cannot be modified anymore?NONE

No dynos, as i wasn't on the forums at that age and there was never a need for validity. We're going off on tangents heres comparing apples to grapes. Stock m5 exhaust compared to a SS 540i muffler on an m5??? i guess SS m5 muffler on an e39 m5 compared to a SS 540i muffler on an e39 m5 would be considered an irrational comparison.

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post #55 of 541 Old 9th December 2013, 08:26 PM
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There is very, and I stress very, little gain to be had in mod'ing the exhaust system aft of the rear axle. However, adding significant restriction, removing the right side, will hurt performance. Most of the gains on the OP's 03 are from the headers, cats, the mid-pipe and of course the tune. The e39 M5 and 540 mufflers are the same internally but the M5 get 4 instead of the 540's 2; which setup has better flow should be self-evident.

I dare say that if you want a spare tyre, relocate the battery to the right side (every other e39) and fabricate a floor insert to accommodate a space saver.

///M - The most powerful & expensive letter in the alphabet

1 of 123 ANTHRAZIT METALLIC (397) / WALK NAPPA/SCHWARZ (M1SW)
Tuned by BMW Motorsports 4/2001, Bone Stock at 185,000 Miles. 355.78 WHP / 345.33 WTQ
2 facts you might not know: Ducks cannot fly and they nest in trees.
Updates:
BM53 Radio / Gen-13 ULF / OEM Sirius / MK-IV Navigation / Aux input / Intravee II / KCA-410c / KCA-420i / 5th Gen i-Pod Nano / CHA-S634 / Umnitza VXX Angel Eyes / F10 ///M5 Shift Knob /
Schmiedmann Shadow Chrome Grills / Rear Fog Lights
DIY: Retro-Fit Auxiliary Audio Input Harness /// DIY: E39 - BM53 & (BMW) Sirius Radio Retrofit /// DIY: E39 - Replacement of the Left and Right Firewall Covers
For Sale:
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post #56 of 541 Old 13th December 2013, 11:38 PM
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Saw the M5 and the man, the myth, the legend, in person today…. car looked great and nice meeting you !

update the thread with pics of the new BBS RGRs once mounted !





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Last edited by 05mdriver; 13th December 2013 at 11:39 PM.
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post #57 of 541 Old 14th December 2013, 02:14 AM Thread Starter
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Saw the M5 and the man, the myth, the legend, in person today…. car looked great and nice meeting you !

update the thread with pics of the new BBS RGRs once mounted !





.
Hah. I was looking my worst. Up until 4am working on the M3, unshaved for 3 days, unshowered.

Good to meet you, too!
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post #58 of 541 Old 14th December 2013, 02:21 AM Thread Starter
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post #59 of 541 Old 20th December 2013, 02:03 AM Thread Starter
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Probably time I post up an update .

So, what's new... Lot's of buying a used car enjoyment :P

I ordered a set of treated (not coated) rod bearings for when i do the engine overhaul: BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) - View Single Post - Bimmerworld’s S54 Treated Rod Bearing Upgrade Kit

I got a set of RG-Rs that I'm going to use for summer wheels. 18", silver, I'll be running them with BMW center caps most likely. 18 lbs front, 20 lbs rear, 8000 ton forged, correct offsets, clear the BBK, and I think a good color for the paint color. The stock wheels are still on the car, but now with a set of Michelin PA4s in 245 square.



Went to install some laser interceptors and discovered this interesting sensor...



Traced it back to the source... ecu... WTF, this is the AIT sensor? Crap, that's not good for the engine AT ALL. Also, why would someone wire it directly to the ecu instead of repurposing the MAF wiring if they were already doing an Alpha N conversion? Ug ug ug. Oh well, fixed now...



So, drilled a hole in the bottom of the filter housing and mounted that properly (no pic).

But then, when I took the intake housing out... what is this!??!



Looks like some mouse action. Cleaned it up, replaced filter. Little jerks.

While I was in there the secondary air pump was staring me down...



So it had to die



Then the aux wash tank locked at me in a funny (leaky) way...



So I killed it too



Installed some ultimate cup holders (bad pic)



and some USB power for on the go charging that can still be folded away when not in use...



And it looks like i forgot to take of pics of the final LI install. I'll grab some in the morning.
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post #60 of 541 Old 20th December 2013, 02:24 AM
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That is the normal location and wiring for an IATS for an Alpha-N or CAI (Dinan).
Dinan D760-0390C M5 Cold Air Intake.pdf

The leak from the Intensive Washer tank is likely the pump. Mine was doing the same. The pump has a weep hole and leaks when the overmold fails the pump will leak until the fluid level is below the weep hole.

///M - The most powerful & expensive letter in the alphabet

1 of 123 ANTHRAZIT METALLIC (397) / WALK NAPPA/SCHWARZ (M1SW)
Tuned by BMW Motorsports 4/2001, Bone Stock at 185,000 Miles. 355.78 WHP / 345.33 WTQ
2 facts you might not know: Ducks cannot fly and they nest in trees.
Updates:
BM53 Radio / Gen-13 ULF / OEM Sirius / MK-IV Navigation / Aux input / Intravee II / KCA-410c / KCA-420i / 5th Gen i-Pod Nano / CHA-S634 / Umnitza VXX Angel Eyes / F10 ///M5 Shift Knob /
Schmiedmann Shadow Chrome Grills / Rear Fog Lights
DIY: Retro-Fit Auxiliary Audio Input Harness /// DIY: E39 - BM53 & (BMW) Sirius Radio Retrofit /// DIY: E39 - Replacement of the Left and Right Firewall Covers
For Sale:
BMW Style 5 17" 2 Piece Wheels And Tires
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