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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 11-07-2011, 07:47 PM   #1
Hornung418
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Engine Harness: M52tu versus M54

So I'm going to acquire a second engine for free, but it doesn't have a harness or DME. It's an M52tub28 and I'm planning to build it and put it in an e30.

Are there any differences between the harnesses? I imagine the Throttle Body and MAF pigtails are different...and possibly the DME pinouts from MS42 to MS43.

Thanks guys.
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Old 11-07-2011, 09:56 PM   #2
hoveringuy
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So I'm going to acquire a second engine for free, but it doesn't have a harness or DME. It's an M52tub28 and I'm planning to build it and put it in an e30.

Are there any differences between the harnesses? I imagine the Throttle Body and MAF pigtails are different...and possibly the DME pinouts from MS42 to MS43.

Thanks guys.
First of all, since it's going into an e30, what DME do you want to run it with?
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Old 11-07-2011, 11:58 PM   #3
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Steve, I think I want to try and run it on MS43 and it should act like a destroked M54B30.

Terra has hinted that this should allow for more appropriate VANOS Mapping and Fuel delivery. The displacement from 2.8 to 3.0 litres only accounts for 30% of power increase, so I'm hoping that with headers, exhaust, Schricks, B30 Manifold and possibly port and polish with +1 intake valves, I should be pushing 230+whp and can hang out at 6k+ rpm all day with no OPN or Damper failures.

I'm talking to Dave Markert, and we're going to have Technica write out the EWS from the DME as well as have it tuned on a dyno when I make the trip down after completing the swap.

This is all about a year and a half down the road to final completion...but I'm just trying to get a parts list together for the big ticket items.
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Old 11-08-2011, 01:32 AM   #4
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You should give it to me.
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Old 11-08-2011, 09:48 AM   #5
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You should give it to me.
And then what?
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Old 11-08-2011, 10:36 AM   #6
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I'm still curious to know why the M52tub28 is immune from the harmonics that effect the M54. How has this been established?
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Old 11-08-2011, 12:37 PM   #7
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I have never heard of a failure. I believe the square bore and stroke of 84mm x 84mm keeps everything balanced. I don't suffer from a massive 4.1k rpm power loss when the DISA opens. I'm always on the look-out for reports regarding the Damper and OPN Failure on a 323/328, but when I rag on it I'm not afraid to venture above 6k.
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Old 11-09-2011, 11:45 PM   #8
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I'm still curious to know why the M52tub28 is immune from the harmonics that effect the M54. How has this been established?
Never really seen the OPN failure for the smaller motors. The issue is Probably because the B30 are undersquare and the alu block doesn't absorb the nasty harmonics as well as the iron block S series motors (which while they have issues, seems less frequent and happen at higher rpm)
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Old 11-09-2011, 11:48 PM   #9
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And then what?
Put it in my car and give you a B25 to play with?
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Old 11-14-2011, 09:55 PM   #10
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Bumpin it up. Looking to know if the two are interchangeable.
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Old 02-01-2012, 01:43 PM   #11
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Question...aside from size difference, are the MS43 B30 MAFs compatible with MS42 DME? I'm looking to have a custom TB made to work with the Throttle Cable and Cruise/DSC control that's 3.5 inches in diameter.

Don't care if you think it's a waste of time, this is planning for the future of my car. Thanks for the tips.
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Old 05-22-2012, 08:11 PM   #12
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B-B-B-B-Bump!!

I'm not building an e30, yet. I'm going to continue to mod my 328i. I am one of the few with a B30 Manifold, and I've gained quite a bit on the top end, and I'm ready to get moving on the missing piece to the intake puzzle.

After reading Aggie's thread on the DISA repair kit from German Auto Solutions, I noticed on their site that they are working on a Cable driven 330 Throttle Body!! So now I really need to know if the early 330 MAF is a direct swap for the 328. Like, what does it really do that's different? I know that the MS45.1 MAFs read Intake Air Temperature, so those won't work. Seems like the MS43 should be a direct swap. Please let me know if I'm misinformed. Thanks fellas.
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Old 05-27-2012, 12:13 AM   #13
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It's been a while since I looked at it, but IIRC the DME wiring is very similar. A couple wires were added for the DBW stuff, but that's about it.

Personally, I'd probably run off the old 413 DMEs and not worry about any of the OBDII crap if I were swapping into an E30.
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Old 05-27-2012, 01:18 AM   #14
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Alexxander.foster is working on a retrofit for the M54 TB to read the MS42 DME, and I've confirmed that the MS43 MAF will work with the MS42! It was only in 03 when they introduced the new MAF with the Intake Air Temperature sensor integrated that the plug was changed.
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Old 05-28-2012, 09:13 AM   #15
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Some of the plugs look different, for example, some are 2 pins vs 3 pins. You can find a cheap harness on ebay. I needed a new ICV plug so I paid $50 for one.

I've heard that the 2.8's don't suffer from the harmonics issues because of the crank and the smaller displacement.
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Old 05-28-2012, 11:37 AM   #16
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Yup. The square bore/stroke doesn't seem to be conducive to harmonics issues, but anything is possible.
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