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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-09-2012, 05:16 AM   #21
e60fan
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Originally Posted by xixixi View Post
This is how you do it, take 3rd gear to about 6k. Grab 2nd really hard.. bingo rev limit removed!
WOW! How many engines did you blow up with this hint?

P.S. guys stop laughing - AC Schnitzer has 7500 RPM limit on M54B30 at e46.

Last edited by e60fan; 07-09-2012 at 06:00 AM.
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Old 07-09-2012, 09:07 PM   #22
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If that is true (I cannot find a single reference to an ACS tweaked M54), there are certainly hardware mods on top of it. Downshift to 2nd at 75mph - that should get you to 7500RPM. If the engine survives, raise the limiter. If it doesn't, the. You'll know the valves float at 7500 or earlier.
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Old 07-10-2012, 05:25 AM   #23
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My friend was owner of stock e46 330i and ecu tune from ACS - rev limit was 7500 RPM as he said, but often he didn't go more than ~7200 RPM.
To be honest 7400 RPM will be enough for me, also guy from Sydney said that rev up to 7500 RPM only with 272 cams, SS exhaust and tune - everything was good.
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Old 07-10-2012, 06:04 AM   #24
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My friend was owner of stock e46 330i and ecu tune from ACS - rev limit was 7500 RPM as he said, but often he didn't go more than ~7200 RPM.
To be honest 7400 RPM will be enough for me, also guy from Sydney said that rev up to 7500 RPM only with 272 cams, SS exhaust and tune - everything was good.
I was hoping you'd catch the hint....but I've run an M54B30 to 7600 RPM. The engine however, was far from stock. I have another turbo project that I'm working on right now that I will probably never rev over 7000 RPM....and that's with upgraded internals, heavily modified head, and 272/256 cams.

My advice is stay away from high RPMs unless you want to fork out for a dry sump system.
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Old 07-10-2012, 09:08 AM   #25
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so the consensus is that acs is not very knowledgeable about the m54 and its opn issue a flow through the head. would love to see the dyno at 7500 rpm on a stock 330 with a tune
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Old 07-10-2012, 04:02 PM   #26
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I was hoping you'd catch the hint....but I've run an M54B30 to 7600 RPM. The engine however, was far from stock. I have another turbo project that I'm working on right now that I will probably never rev over 7000 RPM....and that's with upgraded internals, heavily modified head, and 272/256 cams.

My advice is stay away from high RPMs unless you want to fork out for a dry sump system.
what was the config?
with turbo 6800 RPM will be OK

may be somebody know RPM diapason of 272/256 cams, when kick in and fall?
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Old 07-10-2012, 04:07 PM   #27
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so the consensus is that acs is not very knowledgeable about the m54 and its opn issue a flow through the head. would love to see the dyno at 7500 rpm on a stock 330 with a tune
also I remember ACS tune for e34 - 8500 RPM rev limit, don't remember engine model
I agree that on stock M54 with ~7500 rev limit you will be get nothing in power

Last edited by e60fan; 07-10-2012 at 04:08 PM.
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Old 07-10-2012, 04:31 PM   #28
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also I remember ACS tune for e34 - 8500 RPM rev limit, don't remember engine model
I agree that on stock M54 with ~7500 rev limit you will be get nothing in power
yeah, on an S38, which is very, very far from an M54B30. S38s were black-art mad german scientist motors, not vanilla daily production engines. Each one was hand built by BMW M along with the rest of the car they came in. Rebuilding one from scratch costs as much as an entire M3.

M54s tend to come apart at such high revs, which is what the other posters are getting at. if you want 7500+rpm, maybe a swap would make more sense. There must be a reason some of these guys are going turbo + a lower rev limit, rather than a high RPM screamer.
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Old 07-10-2012, 05:11 PM   #29
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yeah, on an S38, which is very, very far from an M54B30. S38s were black-art mad german scientist motors, not vanilla daily production engines. Each one was hand built by BMW M along with the rest of the car they came in. Rebuilding one from scratch costs as much as an entire M3.

M54s tend to come apart at such high revs, which is what the other posters are getting at. if you want 7500+rpm, maybe a swap would make more sense. There must be a reason some of these guys are going turbo + a lower rev limit, rather than a high RPM screamer.
no, it was not ///M
also only S38B38 was hand built for Germany production, S38B36 not hand built for export as I remember

I don't want 7500+ RPM, only ~7400 RPM for best perfomance gains with 272/256 cams for example
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Old 07-10-2012, 05:22 PM   #30
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no, it was not ///M
also only S38B38 was hand built for Germany production, S38B36 not hand built for export as I remember

I don't want 7500+ RPM, only ~7400 RPM for best perfomance gains with 272/256 cams for example
theres is no performance in that range with those cams. i could imagine peak hp with 264's is 7,000 and 272's would be something like 7200 if that but at 7200 the head dosent flow so what can you do
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Old 07-10-2012, 05:25 PM   #31
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no, it was not ///M
also only S38B38 was hand built for Germany production, S38B36 not hand built for export as I remember

I don't want 7500+ RPM, only ~7400 RPM for best perfomance gains with 272/256 cams for example
I'm sorry but I don't believe you. there are no BMW engines that can rev past 8000rpm that aren't built by the M division. perhaps they swapped an S38 into a standard E34, but it definitely wasn't an M30, M20, or M50, and either way it has no relevance to your question about the M54.
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Old 07-10-2012, 06:04 PM   #32
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theres is no performance in that range with those cams. i could imagine peak hp with 264's is 7,000 and 272's would be something like 7200 if that but at 7200 the head dosent flow so what can you do
ok, so to use 272/256 cams ~7200 RPM limit is enough
about flow - head porting and polishing must do the work
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Old 07-10-2012, 06:06 PM   #33
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I'm sorry but I don't believe you. there are no BMW engines that can rev past 8000rpm that aren't built by the M division. perhaps they swapped an S38 into a standard E34, but it definitely wasn't an M30, M20, or M50, and either way it has no relevance to your question about the M54.
may be I wrong but I see ACS tune file for e34 and guys was excited, 8500 RPM limit in comments, nothing about ///M, may be I find it again and upload to see
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Old 07-12-2012, 08:24 PM   #34
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I can confirm that the valves will float and connecting rods will break at 13k RPMs
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Old 07-12-2012, 08:40 PM   #35
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ok, so to use 272/256 cams ~7200 RPM limit is enough
about flow - head porting and polishing must do the work
port and polish I'm sure will do the trick
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Old 07-16-2012, 03:13 PM   #36
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Today was fun with 7500 RPM limit - awesome! Kicks insane, max MAF ~600 kg/h after 6600 RPM stays up to 7500 RPM. After 7000 RPM adds some small vibration sound, after 7400 RPM it's bigger. So really I need 7200-7400 RPM to shift next gear in 6k+ RPM and stay in maximum acceleration. Next mod will be 272/256 cams and lightweight flywheel. May be I go to B30, but ATI Super Damper for B30 to achieve 7500 RPM limit really costs too much, about 1k $, almost like Schrick.
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Old 07-16-2012, 03:34 PM   #37
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i scored my 264's for 400 shipped and my damper for cheap to
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Old 07-16-2012, 03:39 PM   #38
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i scored my 264's for 400 shipped and my damper for cheap to
WOW! Where did you find it mate? I also need those goods for cheap

Last edited by e60fan; 07-16-2012 at 03:41 PM.
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Old 07-16-2012, 07:50 PM   #39
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WOW! Where did you find it mate? I also need those goods for cheap
Damper will be difficult for you to find at a good price .. I searched all the random BMW forums and their classified section and this guys engine blew and never had a chance to install the shricks

Last edited by Steven747; 07-16-2012 at 11:12 PM.
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Old 07-16-2012, 10:03 PM   #40
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Today was fun with 7500 RPM limit - awesome! Kicks insane, max MAF ~600 kg/h after 6600 RPM stays up to 7500 RPM. After 7000 RPM adds some small vibration sound, after 7400 RPM it's bigger. So really I need 7200-7400 RPM to shift next gear in 6k+ RPM and stay in maximum acceleration. Next mod will be 272/256 cams and lightweight flywheel. May be I go to B30, but ATI Super Damper for B30 to achieve 7500 RPM limit really costs too much, about 1k $, almost like Schrick.
I think you really need to re-evaluate your shift strategy for optimal acceleration. For an otherwise stock M54, you are talking about staying in the weakest part of the torque curve. Both hp and torque really start to drop off after about 6k rpm (ref dyno link). Would really love to see a dyno of your stock m54b25 with 7500 rpm rev limit - you'll want a baseline to compare to anyway after you upgrade cams. I don't particularly recommend a LW flywheel with those kinds of engine speeds.
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