Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 01-10-2020, 03:29 AM   #1
Registered User
 
truegearhead's Avatar
 
Join Date: Jul 2011
Location: Richmond, VA (The Fan)
Posts: 821
Audi RS6 4.2L Swap?

OK, stay with me here. An audi 4.2L C5 motor will bolt up to a Boxster transmission and is a proven swap. The same generation C5 RS6 bi-turbo (which does not share the same block) can be swapped into the 4.2L C5 motor with the same 4.2L C5 transmission so I assume it can be bolted onto the Boxster transmission as well. Looking on eBay these motors are around $3-4K, and have 450hp out of the box and with a chip can generate 510+hp. Of course a turbo motor is much more complex but still a very cool swap idea. Someone go do this

__________________
1997 2.5 Boxster NASA Time Trial track car
2003 911 C2
NASA HPDE Instructor
truegearhead is offline   Reply With Quote
Old 01-10-2020, 05:27 AM   #2
1998 Boxster Silver/Red
 
Join Date: Sep 2017
Location: 92262
Posts: 2,059
Quote:
Originally Posted by truegearhead View Post
OK, stay with me here. An audi 4.2L C5 motor will bolt up to a Boxster transmission and is a proven swap. The same generation C5 RS6 bi-turbo (which does not share the same block) can be swapped into the 4.2L C5 motor with the same 4.2L C5 transmission so I assume it can be bolted onto the Boxster transmission as well. Looking on eBay these motors are around $3-4K, and have 450hp out of the box and with a chip can generate 510+hp. Of course a turbo motor is much more complex but still a very cool swap idea. Someone go do this
OK. You've got my attention.

I've read posts that suggest a true just-bolt-on... but am left wondering: is this bolt-on to a manual transmission and/or the Tiptronic? Pardon my ignorance, I don't know everything.

Also... I'm assuming there would be some retrofitting? Motor mnounts... moving some electrical and cooling lines?

Finally, can the rest of the car handle the 450HP? You know... not torquing the **************** out of anything?

Thanks!!
__________________
1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport

"Ignore the guilt, and take your turn"
Starter986 is offline   Reply With Quote
Old 01-10-2020, 08:32 AM   #3
inveniam viam aut faciam
 
Join Date: Mar 2014
Location: Arvada, CO
Posts: 428
Well, first off the block will NOT bolt up to the Boxster transmission. The RS6 block is different than all of the other Audi V8s in that is was made to accommodate a larger bellhousing necessitated by use of a larger torque converter to handle the torque of the twin turbo V8. People that have done manual swaps in RS6s need to use an adapter plate and get a special flywheel, as the RS6 crank has 10 flywheel bolts vs. the normal eight on other Audi engine that have manuals.

That is the least of the worries putting one of those in a Boxster. If you have ever seen the packaging of the engine compartment in an RS6, you wouldn't even consider putting it in a Boxster. They are truly nightmarish. It is hard to fit 2.7T in a Boxster. I can't imagine trying to fit an RS6 engine in one. If you want that kind of horsepower, a LS engine would be a much easier and likely lighter swap.
__________________
'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
Qmulus is offline   Reply With Quote
Old 01-10-2020, 02:22 PM   #4
Registered User
 
truegearhead's Avatar
 
Join Date: Jul 2011
Location: Richmond, VA (The Fan)
Posts: 821
Quote:
Originally Posted by Qmulus View Post
Well, first off the block will NOT bolt up to the Boxster transmission. The RS6 block is different than all of the other Audi V8s in that is was made to accommodate a larger bellhousing necessitated by use of a larger torque converter to handle the torque of the twin turbo V8. People that have done manual swaps in RS6s need to use an adapter plate and get a special flywheel, as the RS6 crank has 10 flywheel bolts vs. the normal eight on other Audi engine that have manuals.

That is the least of the worries putting one of those in a Boxster. If you have ever seen the packaging of the engine compartment in an RS6, you wouldn't even consider putting it in a Boxster. They are truly nightmarish. It is hard to fit 2.7T in a Boxster. I can't imagine trying to fit an RS6 engine in one. If you want that kind of horsepower, a LS engine would be a much easier and likely lighter swap.
__________________
1997 2.5 Boxster NASA Time Trial track car
2003 911 C2
NASA HPDE Instructor
truegearhead is offline   Reply With Quote
Old 01-12-2020, 02:07 AM   #5
Registered User
 
Join Date: Oct 2015
Location: Cardiff, UK
Posts: 74
Just fit an Audi 2.7t and turn the boost up

Escy is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 08:53 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page