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M52TUB25 Tuning: Difference between revisions
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Let's tune the BMW M52TUB25 engine from 170hp to M54B25 level (192hp). | Let's tune the BMW M52TUB25 engine from 170hp to M54B25 level (192hp). | ||
Revision as of 15:12, 26 October 2022
Let's tune the BMW M52TUB25 engine from 170hp to M54B25 level (192hp).
Basic difference is that the M52TU engines use cable throttle with MS42 and M54s use drive-by-wire with MS43.
Here are both engine compared in known data:
Engine | Displacement | Bore x Stroke | Compression ratio | Power | Torque | RPM limit |
---|---|---|---|---|---|---|
M52TUB25 | 2494cm³ | 84mm x 75mm | 10.5:1 | 170hp @ 5500rpm | 245Nm @ 3500rpm | 6500rpm |
M54B25 | 2494cm³ | 84mm x 75mm | 10.5:1 | 192hp @ 6000rpm | 245Nm @ 3500rpm | 6500rpm |
They are exactly the same, except for the 22hp difference in power.
Intake manifold runners have the same length, but different inner diameter. Also the throttlebody is equal in size.
Let's find out how BMW limited the older M52TU in the ECU software
Intake System
The intake manifold is a lot bigger on the updated M54 2.5L engine then it was before on the M52TU.
Another significant improvement was the new M54 airfilter housing that improved airflow even more.
DISA
This one is easy, there is only one small part load and an even smaller full load table to compare.
You can see, that exactly where the M52TU produces its peak power, the DISA flap shuts the path between the two differential runners, leading to less air filling inside the cylinder.
This actively prevents the engine from producing more power from 5500rpm upwards. By the way the 2.8L brother of this engine does the same.
Copying over the maps 1:1 should be enough here.