78sc 3.0 Can I add turbo??

[RarlyL8]

I would think the stock Euro 930 exhaust would be perfect for an SC conversion. There is no cat and very few mods would be needed to make it bolt right up. You may be able to get away with not using an oil pump if the mount is moddified to place the turbo up higher.

[air-cool-me]

We don't have the constraints of mass production, emissions, and limited tech that Porsche was limited to back then

just the constraint of $$ now

looking for a Used BAE kit because i would like to keep from removing the heat exchangers(i dont think they have moved in 20+ years)

I DONT want a scavange pump, how much would it have to be modified, anyone have a picture were the turbo sits without modifying it? any way to just add a nice big old spacer to place the turbo up a few inches more?

[turbo6bar]

Originally posted by air-cool-me
I DONT want a scvange pump, how much would it have to be modified, anyone have a picture were the turbo sits without modifying it? any way to just add a nice big old spacer to place the turbo up a few inches more?

Sam Gore and tsuter have BAE kits. So does pjv911. I believe neither install uses a scavenge pump. If I recall correctly, the turbo drains into the left timing chain cover. Use a big hose and aim the turbo drain straight down.

[sammyg2]

It would be relatively wasy to duplicate the BAE kit, the olny hard to make parts are the rubber boots that go on the throttle housing and air sensor thingy.
If you could get those the rest could be fabricated.
My car is running 6 psi right now and I will bump it up soon when i get a CIS issue ironed out. The A/F ratio swings a little, which it did before the turbo also.
I've played with the mixture quite a bit, replaced the O2 sendsor, etc. It may be that it is just too far out of normal range, I guess I need to buy an exhaust gas tester to nail it down.
The car runs great, but at steady cruise I feel a slight surging as the mixture swings. It's done that since I first got it, for a while I ran with the O2 sensor disconnected because it was bugging me. For all I know it could be a DAPO thing.

[RickM]

Originally posted by sammyg2
the olny hard to make parts are the rubber boots that go on the throttle housing and air sensor thingy.

Couldn't these be cast from RTV Silicone? I've use this stuff make molds for casting pewter/antimony/lead/tin etc, so it's designed to take the heat and is flexible.

BTW, I replaced the 4 O2 sensors on a friends '97 993 Twin turbo (Protomotive) on Saturday....and all I can say is...Holy $hiT this car is fast.

[Slider79SC]

Sam,

I had a surging / hesitation at cruise with my 79SC and it turned out to be two things.

The tip of the rotor was very worn and not providing good spark and one of my spark plug wires was not conducting well.

Once I replaced those two things the problem went away, and we had tried everything with the mixture and so on.....

[tsuter]

Originally posted by sammyg2
I've played with the mixture quite a bit, replaced the O2 sendsor, etc. It may be that it is just too far out of normal range, I guess I need to buy an exhaust gas tester to nail it down.
The car runs great, but at steady cruise I feel a slight surging as the mixture swings. It's done that since I first got it, for a while I ran with the O2 sensor disconnected because it was bugging me. For all I know it could be a DAPO thing.

With the turbo, you want to run open loop (disconnected) under boost and closed loop when not under boost.

Here is how:

[PorscheGuy79]

Tsuter is deffinatly a thinker......and that car is wicked cool. Thad you owe me a ride next time I see you.

['76 911S 3.0]

Anyone have website for Knoxville Superchargers. I've searched but have come up with nothing

[air-cool-me]

alright so, 930 exhaust sytem with a spacer could put the turbo high enough to gravity drain?

yea, those boots are really what im after

[sammyg2]

Tsuter, I have the BAE manual and have the lambda system configured exactly as pictured, but don't run with the O2 sensor disconnected. Is that what you mean by open loop? The only difference is the BAE manual calls for the hobbs switch to close at 1.5 psig, mine is set at 3 psig rising.

A couple of years ago I ran without the O2 sensor when it was bad, the only reason I replaced it and hooked it back up because it gives better fuel mileage and better metering under certain conditions and it helped me a pass smog test . Right now I am just about ready to disconnect it and tune it manually like I did back then. I hate to give up and admit I can't make it run as designed, call me a stubborn SOB.

[banjomike]

Sammy how do you pass the smog with such a non-stock motor? Have you been sent to a test only station? Do you have to submit to the visual inspection (like in LA and the Bay)?

[sammyg2]

My engine is completely stock, it just has a little modification to the intake and exhaust
A year ago November I had to go to a test only station for my biannual smog test, which eventually I passed. Two weeks later I added the turbo.
When it comes time to test again I will take it back to stock again, prolly only take a few hours.
For those tree huggers out there, the turbo itself does not increase the level of pollution the car puts out, it just affects the visual inspection.
Oh, that and also the catalytic convertor that "fell off".

The same smog rules apply to the O.C. as L.A.