If i put a 400+hp turbo motor into a na coupe do i need a new drivetrain? A new driveshaft, rear axle, new differential? Would the chassis be subject to potential twisting?

 

it might hold. but its going to be a gamble for sure. look at aaroncake's thread. he just switched to a t2 tranny because he went through a na tranny

 

you at least need a different driveshaft. check out aaron cake's threads

 

yes you do ....I just blew up my NA vert tranny and I have a 13bre swap thats only putting out 280whp with stock twins!!!! I just picked up a T2 tranny and complete t2 rear end...

 

NA drivetrains seem to hold up to stock-ish T2 power levels, but the line seems to be once you're past that, the transmission and diffs are a crapshoot.

 

I believe Kevin Landers of Rotary Resurrection had a 466whp build that he used a non-turbo rear end on, possibly the trans as well. BUT, he didn't beat the crap out of it. I remember him saying the biggest thing that had preserved it for him was that he didn't make hard launches. But where's the fun in that? lol For that kind of power you might as well have a beefier trans/diff.

 

If you drive the car the way it was intended to be driven then yes.

 

With an open diff, street driving and sub 400HP, you will probably get about 2 years out of the transmission. The lack of traction is a drivetrain saver. When you start actually putting that power to the ground, you will break NA transmissions at will.

Above 400HP, they just break.

Considering that these transmissions are overstressed from the factory on a 146HP engine, I don't think that's too bad.