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Originally Posted by 986Jim
Okkk.. I wasn't sure how you were going to do the trans/rear end.
An adaptor plate with a custom clutch will work good. I made an adaptor plate for an Miata to run a full RX7 tranny rear end and drive shaft shop axels. We cut it from 1/2" aluminum and used threaded ARP bolts to each point.
THe clutch was a Miata flywheel and pressure plate with an RX7 spline in the miata disc. It was a pretty trick setup and held together well. The Miata made 476whp with a 50trim and spray, on 110octane. Pretty cool setup and the RX7 trans and rear end with a Kazz diff held up for 200+ passes down the track ~ 11.2-11.4.
My question would be then, I wonder how a 2.5L trans / axel setup would handle an LS1. The LS1 makes a lot of torque where the trans on the boxster is only technically designed for 200-220ft/lbs vs say 400. If you were to dump in a Quaife or Kazz it might work, then half shafts would become the next problem.
Another problem is the limited bellhousing size on the Boxster, again you will be stuck with a small sized clutch (whats the boxster? 225mm or so ish.. vs say 300? in an ls1?) which will take a lot of abuse from that motor.
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Daymn that miata must've been flyin'
The part about the tranny holding up is where its just going to be shot in the dark. I'm only going under the assumption that if porsche could engineer a tranny 3 decades ago that handled 3x the power/torque, we can atleast hope that the boxster tranny has the same strength behind it. Torque is what actually kills the 914 trannys and subsequently dsm trannys
, hence forth why many owners use 283, 302, 327s etc instead of 350s. Wish I could have the funds to destroke the LS1 just so I could cheat around that torque issue or find other means of destroying low end torque without loosing too much hp in the process. I'll tell you something though, my 914s clutch was only 215mm lol. Again though I believe its all up to the driver. Many people have destroyed their 914s very quickly while others have the same tranny for years, its merely a matter of driving style.