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M52TUB25 Tuning: Difference between revisions

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'''They are exactly the same, except for the 22hp difference in power. Let's find out what limits the older M52TU.'''
'''They are exactly the same, except for the 22hp difference in power. Let's find out what limits the older M52TU.'''
===== DISA =====
===== VANOS =====
===== Injection =====
===== Ignition =====

Revision as of 09:58, 28 August 2019

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

Intake manifold runners have the same inner diameter and also the throttlebody is equal in size.

Partnumbers differ only because of cable vs. DBW.

They are exactly the same, except for the 22hp difference in power. Let's find out what limits the older M52TU.

DISA
VANOS
Injection
Ignition