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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 Fri, Jan-24-2020, 11:30:41 PM   #11
Braymond141
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

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Originally Posted by 2005E46M3ZCP View Post
These arn't cars I've seen in person, I just see some of the Dyno Graphs that are posted on this Forum or some of the Horsepower Claims and was curious of what about the limit is as far as Horsepower you can get out of a S54 engine and still be Naturally Aspirated safely. I don't have any interest in putting a Turbo on my Car, prefer to keep it NA, but when I see 400 RWHP I'm assuming the car is probably Turbo'd, but maybe extensive Mods are capable of producing that much Horsepower at the Rear Wheels on a NA car.
Nobody is running a 2psi turbo setup to get 400whp.
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Old Sat, Jan-25-2020, 02:36:18 AM   #12
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

i'm not sure what safe means as the OE stuff wears out already.

There is no question the faster wear will quicker in items such as
- rod bearings (more torque means more cylinder pressure i.e. compressive load, more rpm means more inertia tensile load)
- valve springs (more lift means higher operating stress, more rpm means more dynamic issue such as surge and loss of vlave control, more time at rpm means higher fatigue cycle count)
- cam lobe/finger follower wear due to rpm and more agressive cam profiles.

with strokers and such the pistons and rings will simply not last like an OE set should still get more than ample life though with a proer design unfortunetly many after market ones are garbage generic crap

with a bad tune it doesnt matter what parts you have in it.
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Old Sat, Jan-25-2020, 02:56:25 AM   #13
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

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Originally Posted by 2005E46M3ZCP View Post
These arn't cars I've seen in person, I just see some of the Dyno Graphs that are posted on this Forum or some of the Horsepower Claims and was curious of what about the limit is as far as Horsepower you can get out of a S54 engine and still be Naturally Aspirated safely. I don't have any interest in putting a Turbo on my Car, prefer to keep it NA, but when I see 400 RWHP I'm assuming the car is probably Turbo'd, but maybe extensive Mods are capable of producing that much Horsepower at the Rear Wheels on a NA car.
There’s many supercharger/turbo setups making 500whp+ w/ stock internals for years.

And nobody is stupid enough to turbo these cars for a measly 400whp lol
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Old Sat, Jan-25-2020, 03:40:59 AM   #14
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

I'm just curious...should valve springs be considered for preventive replacement at some point?
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Old Sat, Jan-25-2020, 04:26:27 AM   #15
Braymond141
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

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Originally Posted by digger View Post
i'm not sure what safe means as the OE stuff wears out already.

There is no question the faster wear will quicker in items such as
- rod bearings (more torque means more cylinder pressure i.e. compressive load, more rpm means more inertia tensile load)
- valve springs (more lift means higher operating stress, more rpm means more dynamic issue such as surge and loss of vlave control, more time at rpm means higher fatigue cycle count)
- cam lobe/finger follower wear due to rpm and more agressive cam profiles.

with strokers and such the pistons and rings will simply not last like an OE set should still get more than ample life though with a proer design unfortunetly many after market ones are garbage generic crap

with a bad tune it doesnt matter what parts you have in it.
Youíre making it sound like the engines are rated in hours once modified. This is not accurate. A properly tuned and built motor will last just as long as OE.

Race engines fall into this category, but this isnít necessarily a topic for this thread.
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Old Sat, Jan-25-2020, 06:54:56 AM   #16
digger
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

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A properly tuned and built motor will last just as long as OE.
i'm sorry its not true, they still last a good amount of time but not as long as OE.
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Old Sat, Jan-25-2020, 01:37:16 PM   #17
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

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i'm sorry its not true, they still last a good amount of time but not as long as OE.
Our cars are 20yrs old. Shortened life can be expected even stock at this point. Plus, if you go that far into modifying, then lasting almost as long as an untouched motor is a win.
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Old Sat, Jan-25-2020, 02:19:04 PM   #18
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

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Originally Posted by digger View Post
i'm sorry its not true, they still last a good amount of time but not as long as OE.
Truth. I don't know how it is with the S54, but simple tunes usually get easy power by leaning out the higher rpms where the OE engine developers tuned it to dump fuel to reduce temperatures and extend the lifetime of the engine.
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Old Sat, Jan-25-2020, 06:05:50 PM   #19
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

Our experience with the S54 is that its durability is all about driving techniques and maintenance. Extended high rpm usage (e.g., racing) or bad maintenance will shorten the S54's lifespan. Otherwise, it's pretty damn sturdy at all reasonable power levels.

--Peter
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Old Tue, Jan-28-2020, 05:08:57 PM   #20
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Default Re: Max safe RWHP for an Naturally Aspirated E46 M3

S54 is good engine . I running vt2-575 ess with methanols kit and I made 545whp on 10 psi


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Discussing Max safe RWHP for an Naturally Aspirated E46 M3 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)