4.3 Supercharged Chevy

[Qingdao]

Originally Posted by itsnotanova

I'm guessing you're a chevy guy? The audi/porsche 5 speed is like a T5 and the 986/987 6 speed is like a T56 in terms of power it can take. What you're doing is like connecting a SBC 350 to a T5. Sure it might work, but it won't last if you try doing any kind of aggressive driving. You're kind of limited to power with the 4.3 cast crank but even in stock form I think it's too much for the boxster 5 speed

Never really was a Chevy guy, but working in a shop for almost a decade now I respect their engines. Everything else about GM is garbage, but there engines are nothing to shake a stick at.


Hmm.. It just costs so much to swap that trans. Other than the longer shift cables, does it require different axles?

I think I'm going to try the 5 speed for now and then later on swap over to the 6 speed when it breaks. I mean I have a 5 speed now. Why not have some fun and break it. \m/

[itsnotanova]

Originally Posted by Qingdao

Hmm.. It just costs so much to swap that trans. Other than the longer shift cables, does it require different axles?

I think I'm going to try the 5 speed for now and then later on swap over to the 6 speed when it breaks. I mean I have a 5 speed now. Why not have some fun and break it. \m/

Axles, uprights, calipers, transmission mounts and somewhat the aluminum belly pan but that can be modified easily. That's if you go with a 986 6 speed. A 987 6 speed requires modifying axles too

[Qingdao]

Waiting for Kennedy...

I started working on the subframe. I figure I don't need the engine in place to start on that.

The plan is to run two of these square tubings from the cross member by the bellhousing strait forward and then bolt them to the under body of the car (with a substantial backing plate of course).

Then to give it some more strength I am going to run a bar from where the aluminum skid things on either side of the body and attach that bar to the two running the length of the car.

These are the bolt holes that will secure the subframe to the body. I inserted some steel pipe to give the square stock some "anti-squanch" power. The backing plate I am going to put inside the car (under the seats) will have two M12 bolts welded in place. In my head it should be easy to bolt this subframe up, but its just in my head atm.









On a side note I sold my M96 at a whopping 580#s. I was just looking for a cheap replacement engine when I went with the 4.3; I didn't expect to loose almost 150 pounds of weight.