M30 Update effects?

[x_atlas0]

Howdy, everyone!

I've been pondering paths to take my CS project, and one of those paths is to keep the M30 and warm it up a bit. I remember Paul Cain's 3.8 basically showed the limits circa 1990-2000, but I have seen some work coming from the E28 crowd that makes me wonder if there's more on the table. Specifically, I'd like to know if some of the more advanced engine builders here have seen results using:
-Megasquirt
-Coil on Plug conversion + spark control
-Knock sensor driven spark control
-Individual throttle bodies + Gr5 style intake manifold
-MAF, MAP, or Alpha-N vs the AFM
-Port + Polish
-Larger valves

I've seen builds with these parts individually, but never all together. Does anyone else have a dyno, or other data on the effects of basically modernizing the M30 to this degree?

 

[bdigel]

this is my currant project , restoring / modernizing this 72 race bavaria , I should have some data in a month or so

 

[Oldbmwcoupes]

Beautiful car and the engine bay looks amazing. Please post a few more pics and let us know what’s been done so far.

 

[sfdon]

Howdy, everyone!

I've been pondering paths to take my CS project, and one of those paths is to keep the M30 and warm it up a bit. I remember Paul Cain's 3.8 basically showed the limits circa 1990-2000, but I have seen some work coming from the E28 crowd that makes me wonder if there's more on the table. Specifically, I'd like to know if some of the more advanced engine builders here have seen results using:
-Megasquirt
-Coil on Plug conversion + spark control
-Knock sensor driven spark control
-Individual throttle bodies + Gr5 style intake manifold
-MAF, MAP, or Alpha-N vs the AFM

I've seen builds with these parts individually, but never all together. Does anyone else have a dyno, or other data on the effects of basically modernizing the M30 to this degree?

Megasquirt, M90, big C-tubes, mild cam…. 2 weeks ago Dyno

about 250 ft/lbs at the crank. I build and tune for torque and drivability.

In my opinion- 250, that’s plenty for a daily driver.

 

[x_atlas0]

Megasquirt, M90, big C-tubes, mild cam…. 2 weeks ago Dyno

about 250 ft/lbs at the crank. I build and tune for torque and drivability.

In my opinion- 250, that’s plenty for a daily driver.

Don-

The M90 makes me wonder, has anyone ever tried a twin-spark setup for the M90? The Porsche 964 3.6 was twin-spark, with a bore of 100mm. The M90's right around 94mm, with an off-center spark plug. I wonder if a 2nd spark plug, on the other side of the valves, would cut the combustion time (based on flame speed) enough to allow for effective combustion at higher RPMs without pulling so much timing. If that was combined with airflow improvements, I bet the engine could be significantly more powerful and make it useful to rev more.

 

[sfdon]

I have done so many iterations….
M88, S38, strokers, bored, high compression, turbo. I don’t like driving any of them.

In my opinion- 250 ft/lbs is plenty.
My customer just had us do work on his Dinan turbo coupe. I didn’t drive it because I have already been there and done that.

Let the other guys build those.

My favorite transplant for daily driving on my little island with our 25 mph max speed limit was the euro 733i engine I put in my Csi 2 decades ago. Spin it up!

 

[Belgiumbarry]

i have 236 ft/lbs and 225 HP with a stock 3.5 L( '86) , triple webers , KMS ingnition ECU & coilpacks , and Schnitzer headers. ( and big custom exhaust )

 

[Oldbmwcoupes]

My favorite bmw engine has to be the m90. It has the greatest power to value and is a very simple and robust engine. Most anything past Don’s design becomes costly with diminishing returns, especially if you stay naturally aspirated.