E30 Zone

Finally! All your M5x info in one place!

Using the power of the E30 Zone Wiki, we've compiled the most comprehensive pages on the M50 and M52 engines, all sourced from your Zone posts. That way, you don't have to trawl through the archives finding snippets of info - it's all here for your convenience.

Remember, the Wiki is built from your contributions. If you've got something to add, or want to clear up an error or confusing point, just post it here and we'll get it updated.

Click here for the M5x Wiki

ANNOUNCEMENT: M50 Manifolds

The M50B25 is the best manifold for M5x engines, including the M52B28.

However, there is a fundamental difference between 2.0 and 2.5 intake manifolds for these engines. A number of unscrupulous people have been known to sell the smaller manifold as a 2.5 unit, which will severely affect the performance of the engine.

Click here for the Wiki on M5x Inlets, featuring identification and fitting guides.

Thanks to Andyboy, E30BeemerLad and Leo_328i for the info.

ANNOUNCEMENT: VANOS rattle and repair

The VANOS systems fitted to the M5x are prone to rattling with time. While not a critical issue, it is downright annoying. BMW are aware of this, and repair parts available from dealers to resolve the issue.

Click here for the repair guide.

Click here to learn about VANOS.

Thanks to DanThe for the info.

ANNOUNCEMENT: M50/M52 Wiring looms

The M5x engines use a different loom plug to your E30. You'll therefore need to be get creative with the soldering iron to join it to the E30's C101 plug.

The wiring differs between engines sourced from E34 and E36 cars. The table on the Wiki page will show you how to wire up both types.

Click here for the Wiki on M5x Looms.

Thanks to willnz for the info.