Want to do an M30 swap

[Doughnut]

Hold up a sec.... Are we stroking or turbo? Or both?


I'm confused:???:

[LowR3V'in]

How much tq can the stock clutch handle?
is there a "sport" pressure plate like the m20 one?

[Jean]

Bummer on the broken mount :(

[e30_kid89]

A stg1 or 2 clutch from TCD should work good with a 745i turbo setup.

[JoeMadoo]

Feb 09 Update

The time has come...


Broken motor mount bracket


I'll try to upload some pics every weekend as thats the only time i have to work on it.

Looking for a clutch recomendation that can handle the new found power. Time to loose the dual mass...

[BDK]

Chris never ran the 3.9L or 4.0L scenario as that was abit out of my reach plus mostly for a racing application but the top numbers are for the 3.8L...basically an M30B38...

my buddy says a 4.0L will punch out about 350hp/tq...
and he knows one of his early engines went 100k no problem...

[JoeMadoo]

So what is the status with this car now?

Hangin out in my driveway waiting for a turbo.

I ended up just replacing the bearings and putting it back in. And painting some things black...

First, you're gonna need an M90 block or S38 Block as there is not enough material in a b34/b35 to take it out to 94/95mm Bore to reach the 3.9/4.0L...

I thought just the stroke could be increased to get roughly 3.9L. I could be wrong though...

[BDK]

I'm going to be rebuilding my m30 again because of bad pistons rings. I'm curious as to what i can do as far as stroking it or building it up a little bit while I have everything apart. I know there are ways to get 3.9L I just dont know exactly how...

So what is the status with this car now?

are you going for the 3.9L?

I know a guy who use to work for Korman back in the 90's and he has built several 3.9L/4.0L's for racing back then...

First, you're gonna need an M90 block or S38 Block as there is not enough material in a b34/b35 to take it out to 94/95mm Bore to reach the 3.9/4.0L...

Second, you need a 92 or 94mm crank which is super costly ($2k) plus rods and pistons...

I am planning on building a 3.8L...
I already have the S38B38 90mm crank and rods...along with the harmonic balancer
LTW Custom Pistons
M90 Block
B35 head topend running later motronics and a custom chip
I am still deciding on a 288, 290 or 308 cam...

A friend of mine who is an Engineer for BMW and who also is one of the founding members of the M535i.org, Chris Graff ran some numbers for me ...

I have excel spread sheets with possible outcomes with different motors, heads, cams cranks ...
best bet is somewhere around 303 hp and 318 ft/lbs tq... at the crank..
a pretty square motor...
so if you figure in drivetrain loss it should put down 240-260 at the wheels...

if anyone wants to see the spread sheets email me at

bonfire2@embarqmail.com

[JuanPabloBongto]

Question:
I have an m30b34 going into my '87 325is.
I have a custom, cat-delete 2.5" exhaust, but I have to cut off the m20 headers and find an m30 solution.

A buddy may have stock e28 (from m30b34) downpipe available... has anyone w/ Joe's mounts had luck w/ this b34 exh.manifold+downpipe?
.... to give me something like the pics below?

Or, if e28/b34 exhaust won't work due to space constraints, what m30 downpipe should I seek out?

Here are some pics of my custom 3" exhaust after it came back form the exhaust shop.

Magnaflow 3" Turbo XL



Custom Y Dual 1.75 to Single 3


E32 735i Downpipes

[JuanPabloBongto]

Oh, and one of the first cool things you notice about a m30 in a e30....

When you rev it at a stop light - Yea...your car tilts about 2-3 degress...just like a big block american car would... It feels nice!

Oh, and starting out in second to carry the gear till 60 is fun to. Lets see. passing cars up a steep mountain road like nothing...fun.

awesome... i can't wait

[RickSloan]

the 3.9L stroker idea that was mentioned... i know thats crazy big, but what kinda smaller stroker options are possible???

[Jean]

Just read the whole thing, man... that sucks about you having to change bearings, and then having to do the rings too!!!

Clean swap!!! Awesome job! what is the PN on the AFM's you guys using?

[TwistyTunedE30]

Yes splicing would be the best choice, however i say that because thats how it was done on my car and its working very well. The auto harness has alot of extra sensors/wiring in it specifically for the auto, and the DME is tuned for auto shift points etc. Im not sure if you can use it or not however depending on your electronics skills you could probably get away with it. But again i dont know how to go about using the auto harness.

[Doughnut]

What engine harness would you recommend for my 1984 323i e30? Could I just cut and splice into my original square chassis plug? I didn't think I was going to use my auto harness anyway, whats the differance between the manual and auto m30 harness?

Thanks for the response!

[Doughnut]

repost, oops.