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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 08-26-2013, 02:56 PM   #1
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M54 vs S52 Head flow

Anyone have a head flow chart comparing an m54 and s52? Thanks in advance.

Last edited by secono330ci; 08-26-2013 at 02:57 PM.
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Old 08-26-2013, 03:30 PM   #2
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I've seen it somewhere, S52 flows more than M54. If you look at the ports you will see M50 series has bigger ports.
But the thing is that M54 has a specific flow with separate idle air port and is perfectly matched for the stock displacement of M54 engine.
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Old 08-26-2013, 04:20 PM   #3
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Yes the s52 does flow more. I'm curious to see the numbers. I can't find an s52 flow bench chart anywhere.
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Old 08-31-2013, 02:04 AM   #4
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I once saw something in the FI section of bf.c... can't find it now. But basically, the S52 head flows quite well from the factory -- enough that it won't be a limiting factor unless you really build the motor.

IIRC the M54 flows more than the N52, and the N52 is capable of 272hp n/a... so I'm going to say that porting won't be of much benefit to M54 cars.
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