Suggestions

[Wew]

Hi all,

So I have rebuild my motor ( bottom up) and it has 500 miles on it.
78 3.0. Bone stock everything. Car got totaled by youngster hitting me.
I am transplanting motor to a turbo body style ride. Originality no longer a concern
I would prefer not to open engine back up if possible but looking for a super charge or turbo mod that is reliable and fairly straight forward to install. Mind you I did the engine rebuild and rebuilt 1st and second gears on the 915 box all by my lonesome.
I know I can do this its just an issue of practicality. I may rarely track the car. It will for the most part be a street car. I don't want to blow the motor up by testing its outer limits.
Simply I would like something that can give me the occasional extra performance needed.

Thanks in advance for weighing in,

Gary

[quattrorunner]

You asked for suggestions so here's mine.
First, which compression engine do you have? What year is it and what market was it made for? That will help if you don't know how much compression it has.
The lowest compression engine I believe is the 78-81 American market car and even this engine at 8.3/1 or whatever it is is a little high for boost. I've heard of some guys doing it though. You'd need low pressure. 6psi max if memory serves.
The parts to go boost with turbo is a little more complicated with the sc engine than the carrera so my suggestion is to sell your fresh engine and find a carrera 3.2 engine and boost that. It's simpler and will make more power with low boost.

[jwasbury]

Sorry your 911 got totaled, that blows. I think I know what you're thinking here...you want to enjoy the fruits of your labor and use the engine you built with your own hands, but a 3.0 liter in a turbo body is a sheep in wolf's clothes, so you'd like some "go" along with the "show."

Operating question here aside from what is the compression ratio on your current engine (as Quattro already pointed out), is:

How do you define "fairly straightforward" ??

I'd agree with Quattro that the most straightforward approach for me would be to install a different engine, but I'd skip the 3.2 (which you then have to add boost to) and go straight for a complete 3.3 930 engine and bolt it in.

^That should not be too difficult, but would require that you run a 2nd fuel pump like the 930 (not sure how difficult that is)

Or if your engine has a C/R that lends itself to low pressure turbo charging, you could grow your own turbo set up using a combination of OE Porsche 930 parts and adding some aftermarket bits (possibly will require EFI), or you might also be able to find someone who is selling an old aftermarket turbo kit for the SC engines (BAE is the brand name of one such kit that you hear about from time to time).

^this option involves a fair degree of fiddling in my opinion.

[Wew]

Thanks for the input fellas. It is a 1978 U.S. Engine. 8.5:1 compression.
Yes since it was something I built I was hoping to add to it. After all 500 miles on it and not a drip of oil.
It sounds like the best way to go is hunt down a 930 motor and sell mine.
Any other suggestions ?
Good analogy sheep in wolf's clothes.
Straight forward I meant by not having to open up my engine again, like new cams etc...
Wishful thinking about adding a turbo kit to the car and calling it good.
I have the ssi' and the Monty muffler.
Thanks for weighing in and sharing gents,

Much appreciated

Gary

[quattrorunner]

I didn't suggest looking for a 930 engine only because they're getting ridiculously hard to find and their getting expensive. I looked this spring and couldn't find one. Seriously I couldn't.
It would be great if you found one available because that would be best. That's what I did. My car is a 77 911s and I put a 930 engine in it. Mine was narrow body at first but have since changed lots of things because of the slope issue that happens when the boost takes over the brain.
Easiest is a 930 engine. Next best thing is 930 parts into your engine but then things begin to get complicated. Not crazy complicated but compromises start to be nessissary. As an example: if you had 930 parts on your engine you'll need to use a lighter pressure spring so you don't over boost your compression. And if you change your Pistons to get lower compression then you have the 915 gearbox to contend with. It doesn't like torque. Ask me how I know.
Now the good news is your cams are fine. Keep them. That and the bottom end can deal with the boost as it is. But that's it. Other than that you'll need to figure out oiling and scavenging. Not that hard but it's more stuff. And the exhaust......ssi is good but not as easy as the stock exhaust to go turbo. With stock you'd just need the j-pipe and turbo and muffler.
It's not really that big of deal but there are things that crop up. I'm finally getting past those things after 5 years from start of the swap for me. The good thing is that it's been a running driving project and it's been fun. All worth it in my book.
I say do it. However you decide to do it but read lots. Start as you have and ask questions. This forum is the only way I could have done it.
Good luck. Have fun.

[Wew]

Thanks Quattro

[patina]

Going the other direction but what about a 3.2 short stroke with big carbs/PMOs?

300hp with instant throttle response is quite the rush. Pistons, cylinders, cams, PMOs, etc you should be all in around or under 8k if you do the work yourself...