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Old 01-22-2020, 09:16 PM   #21
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So 5 speeds can't take the torque?

I have decided to tone it down a bit on the engine. No aggressive cam, light boost, stock or dish toped pistons, and only a 25 shot of nitrous at best.

I'd say 300#s on a good day.
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

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Old 01-23-2020, 04:28 AM   #22
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I have decided to tone it down a bit on the engine. No aggressive cam, light boost, stock or dish toped pistons, and only a 25 shot of nitrous at best.



I'd say 300#s on a good day.
I'm all for creativity, and even mods just for the sake of modding.

But I gotta ask, gently; if the goal is 300.... that's a poop-ton of work for 300..... so,.... why?
I mean.... I've done my share of gm v-6 stuff... mostly 3.8's (wasn't the 4.3 the truck motor?) And I get the fascination with turbos on 'em.... but otherwise?

It just seems like SO MUCH WORK for a 10% hp increase over a Porsche 3.2 that bolts right in.
?
Respectfully, of course.

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Old 01-23-2020, 07:28 PM   #23
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I'm all for creativity, and even mods just for the sake of modding.

But I gotta ask, gently; if the goal is 300.... that's a poop-ton of work for 300..... so,.... why?
I mean.... I've done my share of gm v-6 stuff... mostly 3.8's (wasn't the 4.3 the truck motor?) And I get the fascination with turbos on 'em.... but otherwise?

It just seems like SO MUCH WORK for a 10% hp increase over a Porsche 3.2 that bolts right in.
?
Respectfully, of course.

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I can understand confusion. LOL

Most of this work is for the blower right behind my head. Just want the VEEEEE sound. Addition of power is a side effect. I'm a strange one.

I'm toning it back to about 300 because I don't want to spend more than I paid for the car on a transmission. At least not right away. Who knows in a few years once I get the body and suspension the way I want them I might re-visit the trans and engine output. Typical Chevy problems; engine's got more potential than any trans can handle.

Work yeah, but have you priced a 3.2 lately? If I went to the larger tranny and pumped up the 4.3 to a respectable output I'd still be paying less than swapping the engine alone. (side note after the clutch/adaptor purchase I'm in $3500 car purchase included)

Another reason for the 4.3 is I got one when I bought my garbage scow of a pickup truck. I'm about 100% certain it has jumped timing, and it still runs (I just advanced the distributer so it only pings a little). Well 2 years of driving essentially broken and it keeps ticking gives me the impression that its a VERY robust and well built engine. What better engine to put in a car that is less than easy to access the engine?

I am reminded of building my RX 5 years back. The trans always is the compromise area. I had to limit my output on that engine too. But like then I want the engine noises from the blower now; at that time I wanted the wooosh noises from a turbo, the power increase is a side effect.
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Old 01-23-2020, 07:36 PM   #24
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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/
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Old 01-23-2020, 07:58 PM   #25
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Most of this work is for the blower right behind my head. Just want the VEEEEE sound. Addition of power is a side effect. I'm a strange one.
Actually, that makes total and complete sense to me... maybe I'm strange in the same way, but I fully support all sorts of machinations for the right sound...

Carry -on!

And yes, the 6-spd has different axle flanges. I'm told that they can be swapped over though. Also a different input shaft, so clutch would need to be changed as well. (Disc only, if you start with the right clutch)



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Old 01-23-2020, 08:28 PM   #26
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This is the level of crazy I am at.

That's my dually RX7. LOL


https://www.youtube.com/watch?v=FjH_e1V_PYc

^^^ this is my inspiration for the mid engined blown car.
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Old 01-24-2020, 01:07 AM   #27
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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
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Old 02-12-2020, 06:11 PM   #28
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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.
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Old 02-13-2020, 08:30 AM   #29
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I love engine swaps so don't take this wrong, but won't you have a huge issue with how tall the motor is? Let alone with a blower on top

I hope so. I'm gonna build a plexiglass top. I wanna see this...thing.

This line had me howling
Gotta love the enthusiasm and creativity on this forum.

There are so many people that know these cars well on here that its not even always about budget or $$

Anything is possible with a little imagination.
Well done, enjoy the car!
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Old 02-14-2020, 06:04 PM   #30
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Well that cross member isn't as strong as I remembered when I took it out. Its quite thin if you don't know. So I made it stronger as it is going to support an engine that weighs almost 500#s. This is just tacked on for the moment (ran out of wire feed and I don't like my skills with my arc), but the bolt holes match up.








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Old 02-15-2020, 04:46 PM   #31
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Welded my little triangles in there.

God help me I kinda like the red paint. lol








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Old 02-16-2020, 04:07 PM   #32
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Tacked under the car.




There is a reason why this stuff was $10 for an 8' piece... lots of not only rust.





Once again... the red paint.






Now just one more brace across the middle, like east west.
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Old 02-22-2020, 03:40 PM   #33
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Subframe is done; well for the most part. I want to make it into two pieces cause its a nightmare to put it in place, but for now it will serve until I get my adaptor from Kennedy.


I'll say this you can't say **************** about this car and rear structural rigidity.









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