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Old 04-25-2010, 12:39 PM   #1
Another BM
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m30 or m50 swap for e30

So i just picked up a 87 325e.

and of course i'm gonna put some new life into her.

But i wanna plan out a route and stick to it.
One of my major decisions is what motor to go with.

I want it to have as much power as possible without going FI.
Should i go with the more powerfull engine m30, or the newer
m50.


What bolt ons can i do to each motor
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Old 04-25-2010, 01:02 PM   #2
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if your not going with the s50/s52 motor, i say go for the rebuilt m30.
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Old 04-25-2010, 03:48 PM   #3
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well the s5x line motors carry a nice price tag..

The m30 is a great tq motor.

the m50 is newer and better to upgrade.
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Old 04-25-2010, 06:07 PM   #4
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M50 if you put a lot of miles on: only because fuel mileage is significantly better.
The M30 will be quicker.


I have an M30 drivetrain available....
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Old 04-27-2010, 08:12 AM   #5
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Alpina actually offered and build an E30 with the M30, gonna see if this link works for you....

http://www.alpina-archive.com/?page_...&nmt=3-series-[E30]

this link should bring you to a sight where you can see both the B6 2.8 and the B6 3.5 cars to get some ideas of what the cars did with a NA motor.
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Old 04-29-2010, 11:44 PM   #6
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decided none of those motors were not going to get me anywhere near the power i wanted to make...

So its gonna get a turbo.. hoping for 300whp

soo whos got parts laying around.

First think i need is the top end of a i motor.. who has one?
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Old 04-30-2010, 09:14 PM   #7
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300whp? selling yourself short dude! 400 is incredibly easy and proven on a stock m/s5/2.
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Old 04-30-2010, 09:18 PM   #8
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300whp? selling yourself short dude! 400 is incredibly easy and proven on a stock m/s5/2.
i've also read the same thing, but i wanna keep things "simple" and not have to motor swap.

gonna build up the m20
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Old 04-30-2010, 09:20 PM   #9
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^^^ glad you decided to go that way. Just remember that if you just swap to an "I" head (885 casting) with the E bottom end the compression will be pretty low, so matching a turbo will be ever so more important.

That said, it's been done many times and if you want to go that way do it! Just don't bother with chips and RRFPR's. Go standalone or if your willing talk to MarkD on here and get a tune the proper way and never look back.

Also check out e30tech.com.

Good luck!
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Old 04-30-2010, 09:21 PM   #10
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300whp? selling yourself short dude! 400 is incredibly easy and proven on a stock m/s5/2.
300hp is a realisitic reliable number on a M5x engine.
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Old 04-30-2010, 09:31 PM   #11
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So is 500(with a .140 MLS of course).

OP: cool choice on the M20
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Old 04-30-2010, 09:34 PM   #12
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it basically comes down to being more cost effective using the M20 for the HP goals the OP has in mind.

And believe me anywhere between 300-400whp in an E30 is A LOT of fun.
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Old 04-30-2010, 09:45 PM   #13
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Anywhere over 400hp is just retarded. Spin, shift, spin, shift, mis-shift, spin, spin, spin, spin 220, traction.
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Old 04-30-2010, 09:53 PM   #14
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Anywhere over 400hp is just retarded. Spin, shift, spin, shift, mis-shift, spin, spin, spin, spin 220, traction.
Nawwww, come one now!

My friend and I are planning on taking his E30 with a stock M20 to 500whp over the summer If we made a stock 2.5L make 400+whp, the 2.7L (SETA) will make 500whp (or at least close to it).

Stay tuned!
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Old 04-30-2010, 10:04 PM   #15
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HP blah blah blah. build a motor with a torque line and then talk about fun. Sooooooo tired of HP numbers big bragged about I want to see the numbers that make the car move!!!!!
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