Swapping a 930 into an SC

I know there are a few of you out there that have shoehorned a 3.3T into your SCs. I need to pick your brains on several key elements of the swap.

1) Do I need a 930 CD box or will the SC unit do?
2) Two fuel pumps will be used. Do your run them off the front relay? Will I need 930 fuel lines?
3) Are any modifications required on the plug-in for the wiring harness?
4) How is the boost gauge hooked up?
5) What clutch types have been used? The one I am looking at is a Sachs sport clutch, runs $600.

Thanks for taking the time to help out.

Rarly,
Don't forget to get some big brakes for that weight/power difference you would be adding to what's stopping the light car now!!
3,000.00 +++++ !!

It depends alot on what year engine you are putting into your car. Some newer models used a Lambda control box under the seat which is different. Not sure about the cd box, but think that they are different.(I'm putting a C2T into my SC and the wiring is MAJOR changes) Fuel pumps off the same relay is fine, just run them in parallel. Boost gauge runs off a vacuum line from a spot on the intercooler. Clutch options depends on which transmission you are using. If your keeping you same 915 box, your going to have to get a special made assembly from someone like Patrick Motorsports.
Marc

Thanks guys - guess I need to clarify. The engine is a '78 3.3T w/no smog. The car is a '78SC with the original motor in place minus smog controls. Tranny is also the original 915.

RarlyL8 I have a 86 930 and the cd box has 6 pins I think sc has 3. I do have a permatune that I might get rid of. I went back to stock.

RarlyL8,

Suprised to see that you've decided to go with the 930 swap. Judging from your posts on the V8 thread, I was sure that you were going to do the Porschev "cheap power better than a flat-6" swap instead

Out of interest, what level of modifications have you decided upon for your 930 motor?

Rarly:

When I did my research on the swap, the gurus stated that the electrics are identical and plug in for the engine. I'm not sure about the wiring for the second fuel pump, (check a 930 wiring diagram.)

As for the clutch, my plan was to use the 930 gearbox. So, not an issue. If you are going for more power, you already the SC cams, think about the 4 spd.! As I recall that would involve a change in the length of the shifting mechanism. Otherwise, its real close to a bolt in!

My project remains on hold as I am half way around the world.

Dan

I am still weighing my options. The 930 swap is only one of them. I'm gathering info on how much needs to be changed and how much it will cost to do it right. The 915 will be retained, no question about my need for 5 speeds and low gears.

The motor is almost finished. I posted a while back on what was done to the long block. For the rest of the motor I've added a Euro exhaust, new wastegate (1.0 bar), new K27-7200 turbo, new injectors, aftermarket SS muffler, and cleaned up everything. All the smog stuff is GONE. This bastard has cost me a fortune to build, suping up chevys all my life has spoiled me bad.

I still may supercharge the engine. This is what I prefer to do, but right now I don't have the time available for fabrication and engineering (Mark Hargett is a lucky man). In the mean time I'll keep going in the most obvious direction.

The V8 swap is not an option. I am a hotrodder at heart, but that is not the direction I want this project to take. Doesn't mean that some day I might do it with another car though.

1. The SC should have a 3 pin CD box and the turbo should be 6 pin. Here is one for $200 http://216.64.5.194/scripts/ads/classifieds.cgi?search_and_display_db_button=on&db_id=7194&query=retrieval

2. I would add a relay to the rear relay panel for the second pump. You will not need to update to larger fuel lines.

3. Yes...I can share the wiring diagram if you need them.

4. What boost guage are you using?

5. I am asuming that you are keeping the 915...you have several choices, avoid the 4 puck style--the on/off nature is painful for everyday driving. The Sachs 8 puck disks ended up working pretty well. What pp and fw?

Don't forget the oil tank is different for the 930. Do you have the throttle assembly rod for the 930? Did you update your motor mounts? What about torsion bars? Maybe more, I will think about it. If you need the oil tank or throttle rod, I have extras. Also have several clutch/pp/fw combintations.

Best of luck!

David

Thank you David!
I used a 930 with a blown motor as a donor car when I put my widebody SC together. The 930 oil tank was used and I grabbed the t-bars while I was at it. At that point in time a turbo motor was a distant dream but I grabbed all the hi-po stuff anyway!

I thought my '78SC CD box had a 6 pin connector, I need to run out to the garage and check that.

I don't know what boost guage to use, any suggestions? I may have the only stock SC clock on the planet that keeps good time, so I don't want to get rid of it. I figure the stock speedo/boost combo would be big bucks used. If I remember correctly this unit used an electric pickup for boost.

Sachs recommended the sport clutch for around $600. I need to check if this is 8 puck. The 930 4 spd has a larger bell housing and input shaft than the 915. It looks to me like if you use the 915 flywheel then the tranny will bolt up. Will the 915 flywheel bolt to the 930? Looks like it will unless the bolt pattern is slightly different.

The throttle assembly rod came with the motor, it was extremely (actually painfully) complete. I assume the SC throttle cable end will fit the socket on the spring loaded lever that bolts down on the 930 motor.

I have the stock screw type motor mount bar that came with the 3.3T. Assume this is a bolt in.

I may not need wiring diagrams, I have the factory manuals for the 930 but not the SC. Sounds like the CD unit and fuel pumps are all I have to work with. Shouldn't be a problem.

I take it you've done this swap. Got pix in the gallery? I'll look.

There is a 930 tach w/ boost guage on ebay with no reserve at http://cgi.ebay.com/ebaymotors/aw-cgi/ebayISAPI.dll?ViewItem&item=564543365&r=0&t=0

You can use a 3.0 ltr flywheel...the 915 will directly bolt up to the 3.3 with no problem.

The 930 throttle rod and motor mount bar will work just fine with your configuration. If your motor and trans mounts haven't been replaced recently, I would consider changing them to the club sport versions. I tend to notice a big difference with these due to the added torque of the 3.3.

Here is a nice fule pump solution (Holly fuel pump with pressure regulator, Earl's fittings and custom wiring harness--This set up provides accurate fuel pressure and all of the volume needed)

Yeh, I have done this a few times...I will post some pictures--I am working on a site which details the entire conversion process--from sourcing parts all the way through mechanical and body work...including actual costs.

David

Rarly,

Both the 3.3 and SC use the 6-pin CDI-unit and magnetic-pickup distributor.

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Warren Hall
1973 911S Targa

David -

If you'd just take the time to clean off the underside of that car a little, we could maybe see what it is you're talking about.



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Jack Olsen
1973 911 T (3.6) sunroof coupe
jackolsen@mediaone.net

My God that's gorgeous!
You don't actually DRIVE that car do you?
I'll put everything on hold until you post the swap site - sounds perfect. This is beginning to sound a lot easier than I had thought possible. Things that seem too good to be true scare me. What is the address of your site?

David, That's sick.

You guys just have to stop posting pictures like this. I can't get the shiny side of my car to this standard.

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Robert Stoll
83 SC
83 944

I did some checking around concerning boost guages. Heard that the stock 930/tach units are not very accurate. Is this so? The "S" unit that replaces the clock has been recommended. Trouble is I don't want to replace my clock. Other options?

The factory tach/boost is NOT very accurate. Another location for the boost guage is in the left dash vent...someone sells a kit for this, but would be an easy mod for the do-it-yourselfer.

Or...if you want the Jap car street racer look, how about getting one of those cute windshield pillar mount brackets

David

I am placing the bigger 2bar boost gauge in the clock location. Its easier to got to the booster that way . I love the clock (like being analog). I am going to fit the clock in the console with some kind of material.
John
79 930

RarlyL8,

Try the Blitz DSBC. It is 1/2 din size so is pretty easily mounted anywhere and with an audible warning so no excuse for overboosting.
http://www.suprastore.com/supra/blitdualsolb.html

For info on setup, try this link:
http://www.geocities.com/MotorCity/Speedway/9589/dsbc_manual.html

The 930 rpm/boost gauge is useless.