OM 603s use a T30 turbo and the OM 602 s use a T25 turbo, so that's something to consider.

Noob ALERT! What would the difference be between them? Would it be detrimental to the engine?


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I don't know of every precise difference but I suspect substituting a non-original turbo for a turbo that was designed for optimal performance as part of a highly engineered drivability package that these cars are would perform at non-optimal levels even if it could be physically accomplished.

As far as being detrimental to the engine, possibly not but functionally probably so.

I have no reason to argue I was merely pointing out the obvious differences to anyone who was thinking such a move was a direct swap.

I don't know of every precise difference but I suspect substituting a non-original turbo for a turbo that was designed for optimal performance as part of a highly engineered drivability package that these cars are would perform at non-optimal levels even if it could be physically accomplished.

As far as being detrimental to the engine, possibly not but functionally probably so.

I have no reason to argue I was merely pointing out the obvious differences to anyone who was thinking such a move was a direct swap.

In addition the OM 603 could have come equipped with a Garret turbo but might have been originally equipped with a KKK turbo in the alternative. That might also complicate any installation.

The T30 is too big. It won't fit the flange:

https://www.driftworks.com/forum/threads/turbo-flange-dimensions-t25-t3-t04.3809/

If your vacuum controls don't work, fix the vacuum controls. There's no need to rebuild the alternator.

I'm not gonna lie...I was a little confused about that last part about the vacuum controls and the alternator. But, now I get the analogy. Thought you'd get a little laugh out if my dense-brained moment.


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Actually, it was my addle brain moment...I meant to say there's no need to fix the turbo if only the vacuum wastegate control is broken. Sorry about that.

Eh. No offense taken. That's why I posted here before I even thought of trying the swap. I know you guys know what you're talking about. I do appreciate the advice.


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