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Old 04-24-2014, 05:01 PM   #1
diablorojo
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MS43 to MS45 Conversion been successful?

I have been researching this conversion but haven't found anyone who has done it, just the information on the differences. What I have learned:

Different MAF (temp sensor), no big deal
Different O2 sensors, no big deal

Only thing I know for sure.

Is the pin out the same on both?

This seems to be a cheaper and easier option to a full standalone because the MS43 is easier to manipulate and less "Smart". It also will allow the use of a piggyback (which I already have).

We are on the 7th file for my MS45 software, third gear is dropping AFR and puting smoke. I'm gonna see this tune through, but need a better option as I feel the above will be.

If someone has done this successfully can ya please share!!!!

(Yes, ECU, ews, etc....I'm aware)
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Old 04-24-2014, 07:13 PM   #2
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No, the pinout is significantly different.

You're also moving from wideband to narrowband O2 sensors.

You might be able to buy an intact engine harness (in good condition) on Ebay for $200-300. CAN stuff will work fine. Probably will hit into EWS issues.

Good luck.

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Old 04-24-2014, 07:14 PM   #3
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...
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Old 04-24-2014, 07:57 PM   #4
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As always, thanks Matt.

My guy has the ECU and components (EWS included) but no wire harness though I believe I can snag one easy enough. Which harness is need? the main harness I assume..

ECU/EWS, wire harness, O2 sensors, (eliminating MAF anyway so no need). Is this it?
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Old 04-24-2014, 08:24 PM   #5
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here is the car while being tuned.

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Old 04-24-2014, 08:37 PM   #6
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Not 100% certain. Most of the ancillary stuff is hooked up via CAN, with few exceptions (a single wheel speed sensor for vehicle speed, for instance). There will definitely be some customization involved here.
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Old 04-25-2014, 10:01 AM   #7
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I considered it...MS45 is just a PIA. Is the intake manifold the same? I wanna say the MS43 has an extra vacuum hose...there was so something funky beyond the MAF and 02 sensors.

Not sure if other features will be affected like adaptive headlights.


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Old 04-25-2014, 11:19 AM   #8
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I have the ESS manifold so no disa, manifold, etc... That's why it would make perfect sense if someone has successfully done it before. I have researched and this seems to me like the tooth fairy (everyone seems to know and talk about it, but no one has seen it!! lol)

I would be willing if I knew whew what it entailed completely......
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Old 04-25-2014, 06:34 PM   #9
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Use the diagrams WDS has at bmw-planet...try and figure out the mapping..Concentrate on things other then injectors/coils/O2...Those should all be in the engine harness..find out the rest of the items...see how much stuff might have to be moved around.
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Old 04-25-2014, 10:56 PM   #10
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That's beyond my simple application of concepts...I would have to really apply myself to the research...
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Old 04-25-2014, 11:00 PM   #11
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I know a guy with a TS3 did it awhile back...had to convert to an MS43. Forgot the screen name...


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Old 04-25-2014, 11:26 PM   #12
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Quote:
Originally Posted by diablorojo View Post
I have researched and this seems to me like the tooth fairy (everyone seems to know and talk about it, but no one has seen it!! lol)

......
I've done the more difficult thing. I installed the MS45.1 system in 1989 325i and the ZHP engine. Converting from MS43 to MS45.1 would be half a day job, it is very easy if you have the right parts and right coding for the DME. You can even install sport switch from M3 and use it on MS45.1 with the right coding.
You need full harness, except coil harness. MAF and 02 sensors. That's it. DME will need to be programmed to accept regular fuel pump relay instead of module.
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Old 04-26-2014, 09:23 AM   #13
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I am trying to go MS45 to MS43....not sure if I read your post right. Looks like just harness and O2 sensors...
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Old 04-26-2014, 09:55 PM   #14
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Heh, your title is MS43->MS45.

Yes, I forgot about that. The fuel pump is CAN controlled on the MS45.

So, yes..harness, O2 sensors, and something to wire up the fuel pump like the 02/early 03s...

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Old 04-29-2014, 10:04 PM   #15
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We decided to move forward on the swap... We have the ECU, EWS, and harness, and O2 sensors from a 2002 328. We will load the current tune to the new ECU. We are also going to wire the MAP3 ECU...

The MS45 is too smart...11 tunes and it just adjusts itself....so, we will now remove it.

If this works I have a brilliant idea for more power...the 2.3 liter twin screw also bolts right up with the same bolt patern.....

But let me not get to far ahead of myself.
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Old 04-30-2014, 06:38 AM   #16
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Why are you bothering with the MAP3? If you've got the ability to modify the MS43, stop there.

Tuning one ECU, only to be overridden by another (with no gains) seems pointless. I had a similar situation with the ProEFI, but the flex-fuel capabilities were the gains...so there was some reason behind it...

I'd see how well it runs on the tuned MS43 before jumping further ahead. The bigger twinscrew sounds like fun, though.

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Old 04-30-2014, 08:15 AM   #17
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I have spend way to much on tunes and even worst, being at the mercy of tuners remotely tuning, sending files, and waiting, at times weeks, to get a file corrected. The engine work is custom so the shelf tunes don't work anymore. Plus with the addition of the larger SC down the road, I'm going to need the ability to tune for it and I REFUSE to be held hostage hoping someone will tune the car. Especially with these cars getting older, shops and tuners are shifting their focus to newer vehicles. The ECU was the only thing holding me back...
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Old 04-30-2014, 08:16 AM   #18
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And I would like to run E85..
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Old 04-30-2014, 08:18 AM   #19
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MS45 is simply not tunable. I've had the best try mine, Oscar Velez, Epic, Evolve, etc...with no luck. Best i got was Evolve was able to tweak my Dinan stg 3 a little for better tq numbers.
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Old 04-30-2014, 08:20 AM   #20
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I bet you could've bought an M3 by now with all the hassle you've been through.
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