930 engine and Trans going into an sc. What do I need to know?

vintagecarlover · 03-03-2015, 07:04 AM

Just picked up an 84 930 engine and 930 gearbox and looking to install into an sc body. What needs to happen to make this work properly? I know there's been threads just couldn't find any. Who has done this and any and all help appreciated.

ClickClickBoom · ClickClickBoom's Garage

It will never work, you....must....ship.....it to me immediately! It will work in my '84 though. Pack securely in wood crate and use Krugerrands for packing material.

T77911S · 03-03-2015, 08:22 AM

you need to know how to dig deep into your pockets which you probably already have.

owning a 930 and if i was wanting more power in an SC, i would go with a 3.6 or 3.8.
trust me, you will enjoy that much more.

vintagecarlover · 03-03-2015, 08:35 AM

got the deal on this package. cant buy 3.6 for what i paid for both including boost guage, shifter and shift rod and out put shafts

vintagecarlover · 03-03-2015, 08:38 AM

when leakdown was done the mechanic said his guage was in the 'buy this engine fast range'

vintagecarlover · 03-03-2015, 08:40 AM

Quote:

Originally Posted by ClickClickBoom

It will never work, you....must....ship.....it to me immediately! It will work in my '84 though. Pack securely in wood crate and use Krugerrands for packing material.

kugerands is how i paid for the engine and trans...i wish u had made the offer last week..fresh out.

Tremelune · 03-03-2015, 10:07 AM

Snap oversteer. Now with less rear tire.

I dunno, man. The cost of the lump will not wind up being significant compared to the cost and time of getting it in the car and properly sorted.

vintagecarlover · 03-03-2015, 10:33 AM

I'm more concerned with axels and the like. What parts do I need? Plan on installing myself. Is the engine crossmember different?? Anyone here done this or should I go to the turbo forum?

jpnovak · 03-03-2015, 10:43 AM

The biggest issue is the transmission. Is this an early (3.0) or late (3.3) 930 drivetrain?

I am not sure the front of the transmission will physically fit in the stock 911 chassis up front. I think there is interference near the torsion tube. I could be wrong.

The axles are different. The 930 should have 6-bolt 108mm flanges and the 911 (915 based) will have 100mm 6-bolt flanges. There was a thread long ago about adapting the 930 flanges to a 4-bolt, 2Pin 108mm setup and then using the early 911 108mm stub axles. You can not simply install a 108mm CV joint on the SC axles. The axles are larger in diameter. I am not sure about length.

The fuel system looks to still be CIS on the engine. You will need both fuel pumps to maintain the correct fuel pressure. Mostly, the second pump provides boost pressure to prevent droop under boost. To me it would be just as easy to install the 044 pump and EFI.

If you are not going crazy with power add-ons You might just want to bolt the engine up to a 915 and have fun with it. This will be easier than adapting the 4sp and give you much better in-town performance.

vintagecarlover · 03-03-2015, 10:59 AM

Jamie. It's a 3,3 from 85. I started another thread on this forum and general consensus was don't use the 915 for this because of torque. Still looking for someone that's done this? How is axel issue sorted?

javadog · 03-03-2015, 11:11 AM

The only one of these conversions I have seen in person, the owner replaced more or less everything in the back of the tub. Torision bar tube, swingarms, etc. Everything was from a 930. Interesting car...

911 Rod · 911 Rod's Garage

I thought the motor mounts are in the wrong spot?

JJ 911SC · JJ 911SC's Garage

Quote:

Originally Posted by 911 Rod

I thought the motor mounts are in the wrong spot?

I think so. Remember reading about being off (or at the transition side) by a few inches.

patkeefe · 03-03-2015, 02:21 PM

Go to the turbo forum.

racerboyrt · 03-03-2015, 02:30 PM

This will be a much much easier project if you use your 915. Sell the turbo box and build up a more stout modded 915 while you dial in everything with the swap. Once your current 915 gives up put in the rebuilt one and it should be pretty reliable. Turbo + 5 speed is way fun.

Craig_D · Craig_D's Garage

Why not sell the engine and tranny, and just buy a 3.6 which bolts right in?

JJ 911SC · JJ 911SC's Garage

Quote:

Originally Posted by Craig_D

Why not sell the engine and tranny and just buy a 3.6...

Yes

Quote:

Originally Posted by Craig_D

... which bolts right in?

Yes, but it still need some tweaking...

Tremelune · 03-03-2015, 03:48 PM

"Just bolts right in" is a bit of an understatement. There are many, many little custom things that go into a 3.6 swap...Certainly easier than a 930 motor, 915 or no. The torque sure is fun, too.

Personally, I'd clean the 930 up, sell it, get the power out of a freshened & modded 3.0, and add lightness...but I'm happy with stock examples, so what do I know?

Ronnie's.930 · 03-03-2015, 04:03 PM

Quote:

Originally Posted by Tremelune

The torque sure is fun, too.

The 930 engine produces a tremendous amount of torque, too - that's why it makes shredded wheat out of even "built" 915 gearboxes.

Matt Monson · 03-03-2015, 04:04 PM

You can bolt SC flanges to a 930 gearbox. Don't know if I would want to run SC axles with a 930 engine, but the flange issue is one of the simpler ones.

The big issue is gearbox length. You can't easily shorten an 84. It has hollow bosses on the bell housing. Some guys will weld on extra material but I don't care for that solution.