E30 M3 S62 Build - Loads of queries about 4x4 drivtrains

[nando]

why not use the E30 TC? if you go by the size of the chain, it can handle ~400hp no problem.

the E34 TC is likely one of two things - PWM control, or simply on/off. It shouldn't be too hard to work with that, but I'm not sure it's actually better than the E30 TC. Apparently on the E34 above a certain speed (somewhere around 50-60mph) it stays permanently unlocked.

[The Dark Side of Will]

Sounds like "Magnetorheological" technology. It's currently being used in continuously variable computer controlled shock absorbers in Corvettes, Ferraris and other high end sports/luxury cars.

Also available here in aftermarket form, if you have the coin: www.magneshocks.com

The BMW front diffs share some basic dimensions with the 168mm rear diffs. They are smaller and weaker because BMW goes for RWD handling bias in its AWD cars... That means the front axle only sees 1/3 of engine power.

If you're going to do all this fab, build a bracket to mount a 210mm diff right next to the crank pulley.

[turbotarzan]

why not use the E30 TC? if you go by the size of the chain, it can handle ~400hp no problem.

Because I already have the e34 TC and back end of the s5d tranny. On the hunt for a e34 530i. I was thinking of rebuilding the TC to make it rotate the opposit direction, but if I can't use the x5 diff there is no point. However after research I think I might have figured out how to make the TC split the power 50/50, just have to find a TC-guru and confirm it. Would be awesome to have mid engine AWD with more than 30 something % power to the back wheels:)
I feel I need to start my own thread because this feels semi-off topic...

[turbotarzan]

Sounds like "Magnetorheological" technology. It's currently being used in continuously variable computer controlled shock absorbers in Corvettes, Ferraris and other high end sports/luxury cars.

Also available here in aftermarket form, if you have the coin: www.magneshocks.com

The BMW front diffs share some basic dimensions with the 168mm rear diffs. They are smaller and weaker because BMW goes for RWD handling bias in its AWD cars... That means the front axle only sees 1/3 of engine power.

If you're going to do all this fab, build a bracket to mount a 210mm diff right next to the crank pulley.

The thaught crossed my mind. A big diff tho'. Need to decide what car to use and check the space needed. Also found a kind of Chevron B8 body( not sure what it is but pretty similar) and frame for peanuts. Waiting for the dimensions of the whole car.

But If I go mid engine I'll just flip the diffs upside down and drill new ventilation and plug the old:)

[The Dark Side of Will]

why not use the E30 TC? if you go by the size of the chain, it can handle ~400hp no problem.

the E34 TC is likely one of two things - PWM control, or simply on/off. It shouldn't be too hard to work with that, but I'm not sure it's actually better than the E30 TC. Apparently on the E34 above a certain speed (somewhere around 50-60mph) it stays permanently unlocked.

If you wanted to use a GPO on the MS to control it, you could do whatever you wanted to with it... as long as you had the sensor data (wheel speed comparisons?) to drive the control strategy.

[turbotarzan]

If you wanted to use a GPO on the MS to control it, you could do whatever you wanted to with it... as long as you had the sensor data (wheel speed comparisons?) to drive the control strategy.

What is GPO and MS? Megasquirt?

[The Dark Side of Will]

General Purpose Output
MegaSquirt

[turbotarzan]

I read up on GPO(English is my third language) and yes, that was kind'a what I was thinking. Just need some info about how strong the current should be and so on.
Then I get to thinking; If I'm gonna have MS in the car I might as well go with the M70B50, always been a wet dream to have one with multiple turbines... That engine was built to have turbos.

Could you hook me up with an adapterplate and stuff for the G 265 to E34 TC, Will? Price? Would be easy to fit a 265 to a M70 bell...

Damn, I have too many options, but a midengine M70 biturbo AWD in something tiny would, needless to say, be BadAss...

[The Dark Side of Will]

If you want V12 power and you have the choice, get a Mercedes V12... FAR superior engine to the M70.

[turbotarzan]

If you want V12 power and you have the choice, get a Mercedes V12... FAR superior engine to the M70.

Not if you want turbos. M70 = 8.8:1 Compression ratio, x-manifolds were built for turboconversion, the internals can withstand a pounding like Shyla Stylez...

[turbotarzan]

+... Early 750 with working engine and tranny you can get for about 1000 bucks in Sweden. Only the engine? About 500.

[The Dark Side of Will]

Here in the US the Mercedes engine is only a little more expensive, but it's 6 litres, DOHC, 4V and 400 HP as far back as '92. The heads flow much better, so it'll make more power on 5 psi than the BMW would on 12. There's also a much bigger aftermarket for the Merc engine, as Merc tuners like Brabus have built ridiculous cars like the SL740 (Yes, 7.4 liters) over the years.

[turbotarzan]

Here in the US the Mercedes engine is only a little more expensive, but it's 6 litres, DOHC, 4V and 400 HP as far back as '92. The heads flow much better, so it'll make more power on 5 psi than the BMW would on 12. There's also a much bigger aftermarket for the Merc engine, as Merc tuners like Brabus have built ridiculous cars like the SL740 (Yes, 7.4 liters) over the years.

I agree, the merc is an awesome engine, but in Scandiland the 400bhp merc 600 i shitty mechanical shape is about six times the price of a 750, expensive spares and because of that no good info/buildthreads etc. There was this one guy in Sweden who supercharged it(merc 600) and threw it in a AC Cobra. Fantastic! But that is serious money. He also has a Gt40 and a De Tomaso... Nuff said...
Then again, a Norwegian dude got something like 1020bhp from a m70 without ever opening the engine, most likely for 1/4 of the price of the merc... Now a days he has about 1600bhp( if i remember this right) in it but with vast mods.
And the weight of the m70 is mindblowing. 155kilos(300pounds?) Dry longblock. The block is 22kilos!!! The E34 transfer case is 32kilos! I know because i just got it shipped to me hehe;)

[The Dark Side of Will]

Are you going by the commonly published list of BMW engine weights? I think they've reproduced it on bimmerforums from a guy in England.

Anyway, those weights sound like SHORT block (IE, without heads) weights to me. I think it lists the S52 at 250 lbs, but I've weighed one fully dressed at 394 lbs.

[turbotarzan]

As I have understood its with heads etc. but without alternators and ac pumps etc. I could be wrong because I never weighd one but I did lift one by hand with a mate and it was not heavy:) Felt like a cast iron inline 4 Volvo engine... And those I have lifted by hand alone.