M30b34 E30 twin-screw supercharged muscle car

[Ether-D]

Aw snap! Cool bro. That could be fun. Has it got a 5-speed in it?

[Pantless Spency]

great thread thus far in very little time.


i will be watching.

[Bullhead]

Aw snap! Cool bro. That could be fun. Has it got a 5-speed in it?

No dangit, it's an automatic. I will have to have the harness messed with a little and get a manual car computer right? I have a 260 and a 240 I could use for tranny's though so no biggy there.

[Ether-D]

On another note…

What are the chances that my m30b34 with the m20 harness and b35 harmonic balancer, will even try to run on a 173 ecu from a m20b25?

[Andy.B]

On another note…

What are the chances that my m30b34 with the m20 harness and b35 harmonic balancer, will even try to run on a 173 ecu from a m20b25?

It should start. It just won't have a good enough air/fuel ratio to be drivable.

[Ether-D]

Mmmm-k. Good. I guess that means I should get off my ass and do some shit. I got the winter depressies. I do feel a bit of productivity comin' on.

[Ether-D]

So these came in the mail today. I might give this a shot sometime.

[Ether-D]

Been doing some research on header fab. I found a calculator to find length and diameter for the runners. It's saying 35.12" long runners that are 1.5" in diameter. 1.5" in diameter? This seems very small to me.

edit: the ports in the head are like 1 5/8" x 1 3/8" so maybe it's closer than I thought…
and after some measuring and some math n shit, the cross-sectional area of a 1.5" runner is 1.77 square inches. And the area for the ports in the header flange are 1.73 square inches. So there you have it.

[The Dark Side of Will]

The header diameter is related to power per cylinder more than port area at the head.

//

M30's have poor coolant circulation to the rear cylinders. I suggest running the E28 heater supply fitting in order to enhance coolant circulation at the back of the engine. Do you have firewall clearance for that?

#11 in this photo:



http://www.realoem.com/bmw/showparts...92&hg=11&fg=15

PN 11121253208

[Ether-D]

Yeah, the ones on ebay for the m5x's are mostly 1 5/8" header runners, which makes me think they may have gone too big.

About the heater outlet, the e32 one is on there and I had intended to use it. It stubs out to the passenger side though, but I figured I'd just go over the top of the valve cover and into the heater core that way.

[The Dark Side of Will]

Can you find the part you mention on RealOEM? I looked at the E32 735i diagram and it had the same block off plate as my E34 535i has.
Did you mean E23?
It appears to use the same part as the E28... http://www.realoem.com/bmw/showparts...91&hg=11&fg=15

If you're looking for 300 HP (which should be very reasonable with that engine and supercharger), that's 50 HP per cylinder. A V8 with 50 HP per cylinder makes 400 HP. Headers for a 400 HP V8 typically have 1 5/8 primaries.

Buy a header design from Burns Stainless. They'll need cam displacement, cam specs and some other details of the engine. Last I checked, the design service cost about $80, but that's been a long time.

Also, that early E28/E12 manifold you found is pretty awesome.

[Ether-D]

It was e23 then. But mine is still different. It looks to come out straight like the one you posted, but that part is blocked off and then it jogs upward, which is open. I'll post a pic.

I found a header calculator online that needs a bunch of crazy specs that I didn't know existed. But I found them magically and plugged them in and that's how I got those sizes.

[Ether-D]

The only figure on that calculator I was unsure about was the volumetric efficiency figure. What would that be on my motor? I have no idea. I guessed 100.

[LJ851]

The only figure on that calculator I was unsure about was the volumetric efficiency figure. What would that be on my motor? I have no idea. I guessed 100.

Not 100.

[Ether-D]

:hitler: Damn you LJ. Offer some info. Don't just say what it's not. It's also not 1000. I know you at least know a ballpark figure…