So I'm in the process of an e30 turbo build, I'm running a vanos M50 in the car now. I'm going to be using Megasquirt, I've been doing a lot of research on it thus far but I'd love some opinions from people who have actual experience using Megasquirt on an M50/S50 engine. I have a few basic questions between the differences of different MS options before I purchase.
If I bought MS3x I'd get the assembled kit, cause lets face it, I'm lazy... but I'd still wire a harness out of an old ECU so it would plug and play. So lets break this down by cost vs. time.
MS3x: Prebuilt $650 + wiring and harnesses $110 + IAT sensor $24 + Spark Boxes (in order to run M50 coils) $180
Total: Roughly $964ish
link to: https://www.diyautotune.com/product/...-57-assembled/
MSpro plug and play: $1500 total.
Link to: https://www.diyautotune.com/product/...w-e36-m50-s50/
Questions:
With MSpro do I still need to buy spark boxes or coil drivers in order to run stock M50 coils? (I know thats a thing for MS3x)
With MSpro will I still need to put an 10k resistor on my crank sensor? (again I know its a thing on ms3x, but I'd assume since its plug and play they would have worked that out or they'd mention in on the page)
With MS3x is it easy to tune for water/meth injection? (they advertise this on the MSPRO page but I never seen it talked about with ms3x... This is something I'm planning for the future of the build so if this feature is much more simple with MSpro than thats a huge plus to me)
With MS3x would my stock MAF work just fine? I plan on running a blowthrough style system (MSpro has a built in MAP sensor that just needs a vacuum line to it, so that kind of eliminates the need for a MAF entirely... anyone running their M50 without a MAF on this system?)
Are they any other Major advantages to one over the other that I'm missing?
Do you think the Price difference is worth the lack of hassle and clean wire-free install of MSpro?
The plug and play is plug and play. You plug it in, and play. No coil drivers.
You can do everything with the ms3x that you can do with the pro.
You wont need a pull up resistor on the crank sensor with the PNP (well i hope not)
I can tell you that ive done probably 20 MS3x installs in m/s50 in OBD1 and OBD2 cars, and ive made alot of money doing it, but now that the PNP is available, i wouldnt do it again. Its a PITA to wire and id rather focus on tuning them.
328i Sedan Twin s366's, 6.0LS, TH400, MS3 Ultimate
9.20 at 150 on 22psi
Like DBurt86 said, both coil drivers and optimizing the sensor inputs for the BMW crank sensor are taken care of on the MSPNP.
Water injection and MAF support are the same between both versions; they run the same code. I wouldn't use the MAF here (MSPNPs can support the MAF, but the base tunes are speed density). You will need to make sure the MAP sensor supports the level of boost you want to run. The MSPNP Pro has a 4 bar MAF; the V3.57 has a 2.5 bar MAF standard with a 4 bar being an extra cost option.
Other things - knock input is standard on the MSPNP Pro and a $100 option on the MS3 V3.57.
But the main selling point for the MSPNP Pro is a clean, hassle free installation.
Matt Cramer
1997 BMW 328i convertible, 1972 Chevy C10 pickup, 1966 Dodge Dart slant six
BMW - where "Why doesn't everybody build cars the way they do?" meets "Why can't they build a car the same way everyone else does it?"
You can run the maf. When properly setup, they work great. But there is a cost involved and setup time. A properly tuned speed density setup will run great. No reason to consider doing anything else.
328i Sedan Twin s366's, 6.0LS, TH400, MS3 Ultimate
9.20 at 150 on 22psi
Thank you everyone for your help! Hope this can help clear up any questions for someone in the future. I ended up buying the MSPro PNP over black friday weekend from DIYautotune. I'm all set! Car is going to be going back together in the next couple months!
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