E34 530i - M60B30 --> M60B40 conversion.

[Vard66]

Probably should be in bed, rather than posting on here, but nevermind that.

I typed out some queries about the management just now, before realising that I might as well knock a whole thread up and get any questions I have regarding the conversion answered in one. I searched and found a few threads, but couldn't see great merit in bumping them up for my purpose rather than simply creating a new one.

Anyway, I'm waffling.

From my limited research, it seems to me that in order to swap the M60B30 out of my '93 530i and slot in an M60B40, what I need to acquire is thus;

engine, inc all ancillaries, plus inlet manifold,
all sensors on the engine, plus I'm assuming lambdas if present,
management,

However, I have some questions.
First and simplest; is all that correct?

Secondly - in my window shopping on eBay, I've encountered a couple of ECUs for the E34 M60, yet quite a few of the adverts claim that their ECU will suit the whole range of M60 equipped cars - to my mind, unless it's self-adjusting like Rover's MEMS system, that can't be right. Surely the maps must be different between the displacements?

Thirdly, I'm lead to believe the downpipes used on the B30 application are suitable for the B40, so bolt off bolt on - correct?

Fourthly, I'm also lead to believe that for some peculiar reason, the B30 has a larger dia clutch than the B40, but either will fit. My search on here told me that either flywheel is good to use; but If I'm thinking to fit the clutch from the B30 (or whichever is the larger of the two diameter clutches), will I need to use the flywheel from the relevant engine, or does it not matter which?

Finally - is my list missing anything, be it critical or optional?


TIA

[Alex SBY]

Cheers for making this post - you've saved me the hassle!

Now, is this a ridiculous idea or doable? Any assistance would be greatly welcomed.

[Jack Dabsy]

Firstly, TB and Manifold would suffice at this time..
Secondly, the ECU is specific to the engine and will need "matching" (programming) to accept the engine, clocks and security !
Thirdly, quite possible.
Fourthly, you answered that... Match them !
Finally, pretty much identical units, just how they take fuel-mixture (ECU controlled if everything else is ok)...

Not a definative answer as the same applies to BMW's straight sixes !!!

[Vard66]

Possibly worth merging this thread with the thread about the car, Mods?