My recent BMW V12 engine transplant... [Cobra replica with V12 twin-turbo] - Page 3 - BMW M5 Forum and M6 Forums General Sportscars See the DVD. This form also contains a BMW X6 and X5 Forum.

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post #21 of 29 Old 10th December 2009, 08:25 AM
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BMW originally used two drive-by-wire throttle bodies, one for each bank’s intake. That’s way too much work. We’re using a single Ford traditional throttle body
Love the simplicity of that... that S62 must have been a blast in that little thing, cant even imagine how awesome that TT V12 is! Awesome work

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post #22 of 29 Old 10th December 2009, 11:25 PM
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That is so cool. Congrats on being able to pull this off. My neighbor as a kid tried to build one of those as a kit car and failed miserably - lost a ton of $ and his wife still bugs him about it to this day. Oh least she's still with him! LOL!

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post #23 of 29 Old 11th December 2009, 03:41 AM
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post #24 of 29 Old 12th December 2009, 04:47 PM
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Thumbs down

Speechless. With the little weight of that chassis, it must really haul as*. I wish you would have turbo'd a BMW V8, I could use the info/knowledge. Thanks for sharing such an awesome project.

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post #25 of 29 Old 19th December 2009, 01:25 AM
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post #26 of 29 Old 19th December 2009, 08:35 PM Thread Starter
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Originally Posted by Gustav View Post
Who have made the V12 turbo conversion?
The twin turbos are all custom work, not a package or kit -- go read more on the thread link I posted at the top of this thread. The turbos are Garrett ball bearing units, oil fed of course. I used the BMW exhaust manifolds that bolt to the block, but everything from there is custom pipe. Likewise, the intake was custom built from aluminum. Intercooler is a pretty standard aftermarket part, etc.

I don't know of any "kit" to slap a twin turbo on one of these engines, but if you have good fabrication skills, it's not impossible. Also prepare for computer work, because you will need larger fuel injectors to support the boost -- I went with 42lb, and I think the factory ones were only 13lb or 17lb.

For the gentleman interested in building a V8 turbo application, it really wouldn't be any different as far as putting it together. Just look at the engine internals and what they can handle, look at your fuel injector capacities, compression ratio so you don't overboost and detonate your block in half...and then the hardest part -- figuring out how to weld it all together so it still fits under the hood. I had (well, made) a lot more space in my tube chassis than you're going to have in an OEM car.

Thanks for keeping the thread alive --
Cheers, John
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post #27 of 29 Old 20th December 2009, 08:08 PM
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post #28 of 29 Old 16th September 2017, 04:24 AM
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Nice work with the BMW V12. My question is what bell housing did you get to mate the Getrag up to? Did you just buy all NOS parts or did you have to do some fabricating? I would like more detail from the flywheel to the shifter is you could help me. Could you put me in touch with any BMW knowledgeable folks? I hope to install a BMW V12 in a Jaguar E-type.
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post #29 of 29 Old 18th September 2017, 02:10 AM
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Smart combo,,,,

but the M70 can take more force than you can imagine,,, 1.2 bar is the limit due the headgaskets,, but a Norwegian guy is boosting 2 bar on stock 10:1 CR ,, 5.4 bottom,,,,,,,,, and making 1400 bhp and 1150 lbs ,, thats somekind of power,, these V12 engines are unreal strong,,, so whatever you blow,, it will hold, but a simple solution to get more boost is Studs, in the head ,, and other gaskets (( dont know were to find a special M70 gasket)) but afaik the M50 studs can be used

Sveinbjörn Hrafnsson

E30 CABRIO V12 M70B50 ///
ALPINA B10 BITURBO 346 @ 507
E34 550 V12 JML
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