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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Dec-10-2019, 05:35:53 PM   #21
Steve M3
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Default Re: S54 conversion muffler shootout

Great information, thanks for doing this.
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Old Tue, Dec-10-2019, 06:13:09 PM   #22
rbg
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Default Re: S54 conversion muffler shootout

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Originally Posted by GeorgeH View Post

Modified S2 with Dinan - 317.35/238.36
Modified S2 with BMW Performance - 315.56/238.16
Factory S2 with Stromung - 315.53/238.49
Modified S2 with 325 Muffler - 308.31/233.83
Modified S2 with No Muffler - 307.59/240.57
Modified S2 with 330 Muffler - 307.37/235.63
SuperSpring S2 & S3 Replacement - 306.48/235.32
Modified S2 with ZHP Muffler - 306.17/238.47
Modified S2 with E36 M3 Muffler - 304.23/236.41
Am I correct that Dinan muffler or bmw performance mufflers put ~10hp more that SS s2+s3 (on a stock tune I assume)?
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Old Tue, Dec-10-2019, 06:52:40 PM   #23
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Default Re: S54 conversion muffler shootout

I'm honestly surprised you got such great numbers out of the E36 muffler/ S2 pipe; those parts on mine, with SS headers/Sec1, were 10whp less.

I bet that has a fair amount to do with how mine was welded together, but still, interesting results.

Another interesting data point would be the pipe OD on the replacement parts. Eg, OD of the SS setup, the BMW Perf, etc. Not much need on the Stromung since it's just a muffler.
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Old Tue, Dec-10-2019, 06:52:50 PM   #24
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Default Re: S54 conversion muffler shootout

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Originally Posted by rbg View Post
Am I correct that Dinan muffler or bmw performance mufflers put ~10hp more that SS s2+s3 (on a stock tune I assume)?
To be clear, this is not their M3 muffleró this is their sedan/wagon s54 conversion muffler.
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Old Tue, Dec-10-2019, 09:35:28 PM   #25
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Default Re: S54 conversion muffler shootout

Quote:
Originally Posted by GeorgeH View Post
I'm still going through the data, but here's some info to start. Note: now that I have the files I realize with the correction factor being used at the dyno was set to STD which will read higher than SAE. I am correcting everything to SAE unless someone gives me evidence to the contrary.

Here is how the data was collected. We first started with the SuperSprint. We made a pull and the car put down 292.98/231.97 (HP/Tq). From there we cleared adaptations and made another pull, this time it did 300.73/232.79. From then on when we put a new muffler on we cleared adapatations and faults (the car never had any faults we just did it for consistency). The car was warmed up to operating temp and then a pull was made. After each pull we let the car cool down for 3 min before making the next pull. We repeated this until the power leveled off or started dropping. Some configurations we only pulled (3) times (never less though), others took 4 or 5.

Here's the initial order from highest to lowest HP output.

(Note: I will average all of the results over each run and then this may change slightly but this is the unofficial ranking as I know everyone wants to see these numbers and I'm not sure how soon I'll have everything fully compiled.)

Modified S2 with Dinan - 317.35/238.36
Modified S2 with BMW Performance - 315.56/238.16
Factory S2 with Stromung - 315.53/238.49
Modified S2 with 325 Muffler - 308.31/233.83
Modified S2 with No Muffler - 307.59/240.57
Modified S2 with 330 Muffler - 307.37/235.63
SuperSpring S2 & S3 Replacement - 306.48/235.32
Modified S2 with ZHP Muffler - 306.17/238.47
Modified S2 with E36 M3 Muffler - 304.23/236.41

The grouping is so close that I don't think there is a bad choice other than MAYBE the 325 muffler. The reason I say this is the 325 muffler had a noticeable whistle during a run we think it just couldn't handle the flow out the small tips. But also the power drastically dropped off on the 4th and 5th runs, maybe it was starting to overheat the exhaust or I don't know. I'm hoping someone might have a good theory on this.

325 runs:
1 - 303.06/234.11
2 - 307.06/234.28
3 - 308.31/233.83
4 - 301.57/233.86
5 - 299.03/233.44

***Another thing I noticed is the dyno graphs are going to 8400 and the car is still making power. The RPM was calculated by comparing the tach to the dyno drum rpm at various RPM. Looking at Dynojet's info it says the Torque is calculated using the engine RPM but looks like HP is purely a function of the drum, so it may mean nothing in the grand scheme of the data, but something to note.
are you going to post the graphs to?
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Old Tue, Dec-10-2019, 10:14:07 PM   #26
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Default Re: S54 conversion muffler shootout

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Originally Posted by Obioban View Post
To be clear, this is not their M3 muffleró this is their sedan/wagon s54 conversion muffler.
Yes, as Obioban pointed out this is a conversion muffler kit they sell. And to be honest it looks like they took their Non-M muffler and resonator kit and then made a section to adapt it to the M3 S1. My thought is this kit was not purpose built for the conversion but made to work as a conversion piece.

Quote:
Originally Posted by digger View Post
are you going to post the graphs to?
Yes, graphs, pictures, video and an excellent audio comparison is coming.
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Old Wed, Dec-11-2019, 02:00:17 AM   #27
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Default Re: S54 conversion muffler shootout

Quote:
Originally Posted by GeorgeH View Post
Yes, as Obioban pointed out this is a conversion muffler kit they sell. And to be honest it looks like they took their Non-M muffler and resonator kit and then made a section to adapt it to the M3 S1. My thought is this kit was not purpose built for the conversion but made to work as a conversion piece.



Yes, graphs, pictures, video and an excellent audio comparison is coming.
i'm wondering if there is anything obvious that you could measure that would account for differences. e.g. inlet pipe size, outlet pipe/tip size, construction type etc
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Old Wed, Dec-11-2019, 06:43:19 AM   #28
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Default Re: S54 conversion muffler shootout

Definitely surprising for the BMW Performance muffler. Too bad it's discontinued.
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Old Wed, Dec-11-2019, 07:42:40 PM   #29
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Default Re: S54 conversion muffler shootout

Great thread! Good options for track guys trying to make light weight exhausts. I wonder how loud they are. Hmm..
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Discussing S54 conversion muffler shootout in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)