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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 07-16-2012, 10:13 PM   #41
Steven747
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Originally Posted by TxZHP04 View Post
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.
would there be a problem with lwf and 7k rev limit?
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Old 07-17-2012, 03:10 AM   #42
e60fan
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Originally Posted by TxZHP04 View Post
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.
I have B30 head with 240/244 cams, bigger intake manifold, DISA, throttle & etc. Also SS headers, no cats, straight custom Magnaflow exhaust with X-pipe. I'm thinking about dyno after ecu tune, now I have lambda at high revs too lean, about 0.92. I want lambda at all RPM diapason 0.85-0.86 or even 0.82 for maximum power.
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Old 07-17-2012, 09:50 PM   #43
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Originally Posted by Steven747 View Post
would there be a problem with lwf and 7k rev limit?
The dual mass flywheel is one of 2 critical damping mechanisms. Can you afford to risk removing it? The ATI damper, while good, may not be enough by itself. Unfortunately there simply isn't enough data to draw any conclusions on the reliability of the combo.
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Old 07-17-2012, 10:15 PM   #44
TxZHP04
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I have B30 head with 240/244 cams, bigger intake manifold, DISA, throttle & etc. Also SS headers, no cats, straight custom Magnaflow exhaust with X-pipe. I'm thinking about dyno after ecu tune, now I have lambda at high revs too lean, about 0.92. I want lambda at all RPM diapason 0.85-0.86 or even 0.82 for maximum power.
Even an m54b30 with 264/248 cams and all your other existing mods runs out of steam around 6k (ie, hp flattens out and torque drops substantially). For max acceleration, you really don't want to stay so far below your torque peak. You're going to need dyno runs to tune your setup properly, might as well go ahead and post up the before and after. You'll find the crowd around here more accepting when there are dyno results to back up the talk.
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Old 08-14-2012, 10:04 AM   #45
e60fan
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found about 8000 RPM limit - this is stock M50B25TU with chip tuning

about me - finally I done tune, may be go to dynostand to see curve
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Old 02-19-2013, 01:06 AM   #46
daniel_f.
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Any update? did you find the rpm limiter? willing to share the info?

im thinking of converting from MS43 to MS45.1, because of wideband.
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