BMW V12 to 500+bhp

[andycanam]

Anyone know anything about these engines from the BMW 750 and 850 range or can point me to sources of info....

I am investigating the posibilty of using one of these engines in my next project with a pair of turbo's strapped on.

My main interest is in the internals and how strong they are and if upgrades are available but any general info would be apreciated.

[dazren]

In the mid nineties I think Willie Koenig (german tuner) was supercharging these babies upto 550bhp+ in customised 850i BMWs. A mate of mines father had one at the time.

DAZ

[andycanam]

I know DINAN (US I think) do twin turbo kits.....

With std CR the 750 5.0L one does just short of 500bhp and 540lbft torque, but don't know if they mod the internals, I suspect not as they probaly would have lowered the cr and upped the 10psi boost a bit.

They also did 850csi twin turbo to 666bhp and over 700ld'ft..... which would be nice.

But are the std internals up to the job?

[dazren]

The 850csi has a 5.6 litre engine as opposed to the 5.0 litre of the standard 750i and 850i.

DAZ

[andycanam]

I've also found out that the 5.6L 850Csi must have internal mods to have twin turbo's as it is as standard nearly 10:1cr, as is the 5.4L one..... but the 5.0L one is only 8.8:1cr.

Not even sure if the 5.6L crank is interchangable with the 5.0L as they have different engine denotions (different block?).

Would be nice if I could just bolt on a pair of turbo's and map it in (wont use the BMW loom though).... I just know it wont be that simple and there has to be a weak point.