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Old 05-27-2020, 07:58 AM   #1
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OK hear me out. Audi W12 swap

Over the past 24 hours I went off the deep end after I found out that an Audi W12 will bolt to the Audi 4.2L transmission which means that it will also bolt to a Boxster transmission. I also found out that a W12 is actually the same length (about) as a Boxster motor which allows you to avoid the LS1 problem. About an hour after these realizations I found myself negotiating the price to ship a (stay with me here) twin turbo W12 out of a Bentley silver spur (these motors are super cheap, under 5k) but unfortunately/fortunately the motor sold just after we settled on a price. My car is a track car, and the plan was to slowly build a tube frame for the back to accommodate any motor but with the compact packaging of the W12 I may not have too. Has anyone else chewed on this idea? The Silver Spur idea is not a good idea but the W12 idea I think is doable.

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Old 05-27-2020, 08:22 AM   #2
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Just because you can bolt things together does not always mean it is a good, or even viable combination. We had a customer that put a Porsche Mezger turbo engine into a Boxster, "because it would fit and bolt up". What he ended up with was a car that cost more then a brand new turbo car that would send the transmission to the junk yard every time it went under full boost from a rolling start.

"Just because you can" doesn't always mean it is a good idea...............
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Old 05-27-2020, 08:54 AM   #3
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My first thought was that it will probably break the transmission right away. My second thought was that would be a really cool (but extremely complicated) swap!
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Old 05-27-2020, 05:02 PM   #4
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Do you have to stay naturally aspirated for your race class?
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Old 05-27-2020, 05:25 PM   #5
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Do you have to stay naturally aspirated for your race class?
Nope. I’d move up from TT5 but as long as it’s in the Porsche family I can fit into a class The Porsche family includes all of the VW products (Porsche, vw, Audi, Lamborghini, Bugatti).
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Old 05-28-2020, 09:27 AM   #6
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W12nengine

The W12 is a beautiful engine, but I am curious to know how much would a W12 weights?

https://www.youtube.com/watch?v=s4sEzlbeVMw&feature=emb_rel_end
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Old 05-30-2020, 04:33 AM   #7
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My first thought was that it will probably break the transmission right away. My second thought was that would be a really cool (but extremely complicated) swap!
That's what I was thinking too. That's if he uses the stock 5 speed. I would hope he would use the 987 6 speed instead as it has the same bellhousing bolt pattern as the 5 speed and is about as or slightly stronger than the 986 6 speed.
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Old 05-30-2020, 06:22 PM   #8
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Originally Posted by JFP in PA View Post
"Just because you can" doesn't always mean it is a good idea...............


I'm full of bad ideas
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Old 06-01-2020, 10:25 AM   #9
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My first thought was that it will probably break the transmission right away. My second thought was that would be a really cool (but extremely complicated) swap!
The Audi 01E transmission which uses the Boxster bell housing would be strong enough. Apparently they can hold 500jp on all wheel drive cars and far over that on rear wheel drive cars. They were used on Koenigsegg’s back in the day. I wonder how strong the Boxster S axles are
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Old 06-01-2020, 01:20 PM   #10
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The 01E is a beast but the problem with it is it's an AWD transmission here in the states. You have to get a 2wd 01E from Europe. There was a guy in Sweden that turned a AWD 01E into a 2wd O1E a few years back.
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Old 06-04-2020, 11:04 AM   #11
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Thanks for the info, I can add it to the list for research. I just bought mine and plan for it to be track car only in the yrs to come. I didn't know that Porsche engines cost so much to rebuild, kinda understand after learning how they are actually built. I've been involved in around 400 LS swaps and really bored with them. I do like the 4.2 Audi but not much for aftermarket. Found the Porsche swapped page on FB and there's everything from Chevy v6 to Honda k series. I sorta like the j series Honda v6 as the market is growing. I like the idea of keep it simple stupid. So that's why I keep finding info in each corner.

I'm guessing by your pic, you are owner or involved with GT racing?
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Old 06-04-2020, 09:05 PM   #12
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You had me at W12.

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