Zitat:
Zitat von rudiSp
M73 unterscheidet sich, glaube ich, vom M73N nicht, da die Anbauteile ja vorhanden sind.
Oder lieg ich falsch?
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Der Motor an sich ist ziemlich identisch, war schon mal Frage im Forum:
http://www.7-forum.com/forum/4/unter...tu-129026.html
Hier wird es auch beschrieben, Zitat (sind nur paar Anglizismen drin, sonst nix):
I did find this out- regarding the engine differences-
The 750i was supplied with an M73 engine from start of production in December 1994 until the end of August 1998. This was a 326 bhp engine producing 490Nm or torque at 3900rpm.
In September 1998, the 750i was given a technically updated engine called the M73 TU (technical update). The cause for this update was to ensure that vehicles produced after this date fell within the emissions guidelines that the government set at that time. The update was not mechanical, but the ECU's and hardware were altered to give a lower emission value.
The M73 LEV engine is the American version of the M73 TU engine. LEV stands for Low Emission Vehicle, and the engine received further technical changes to fall in line with the American emissions legislations, which are more stringent than in the UK.
With the technical update, came the requirement to fit higher power spark plugs. This is mentioned in the Technical Bulletin you refer to, and states that any 750i manufactured after September 1998 should be fitted with the high power spark plugs.
Und noch besser erklärt:
Straight from Bentley Manual
Beginning with 1999 models, 750iL models were equipped with the M73 TU engine which, though it has the same displacement as the older engine, features the following:
* Electrically heated catalytic converters (E-cat) and E-cat control module
* Dual Batteries
* Long-life spark plugs
* Compact water-cooled alternator
* Transmission fluid/coolant heat exchanger
* Rapid-action coupling in the coolant and transmission fluid circuit
* Pulley diameters and accessory belts modified to compensate for new minium idle speed (530 RPM)
Actullay M73N would be more accurate because the TU suggests a "Technical Update" but there really wasnt any change to the motor itself, it was more of the auxilary components that were changed and not the innner workings of the engine.
Other sources indicate there was a slight increase in power and torque but dont know what those figures are. Also, I've read there were over 15000 M73's produced compared to M73N's (TU) and the source for that data was simply Wiki.
Quelle:
https://www.bimmerforums.com/forum/s...36-M73-vs-M73N
Irgendeiner in diesem Forum hat sicherlich mal einen M73 TU anstelle eines M73 eingebaut und kann berichten, was er ändern musste, wenn überhaupt.