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

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. http://forums.pelicanparts.com/uploa...1425398574.jpg
http://forums.pelicanparts.com/uploa...1425398602.jpghttp://forums.pelicanparts.com/uploa...1425398653.jpg

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.

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.

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

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

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

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.

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?

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.

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?

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...

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.

Go to the turbo forum.

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.

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

Yes

Yes, but it still need some tweaking...

"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?

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

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.

At the risk of sidetracking this whole thread, is that so? I drove a bone stock 930 once, and it was dead until the boost came on (and then man!). The 3.6 is instant, endless power from like 2000 RPM...Modern turbos and fuel delivery changing the game?

This is only advisable if the OP wants to spend all of his time worrying about breaking the 915 transmission rather than enjoying his time behind the wheel.

As others have mentioned, even when built, a 915 does not stand a chance against a 930 engine (this has been proven time and again by many people that have tried to use them). And the people that do make them "sort of" last, say that they do so by absolutely babying the throttle.

In the interest of actually contributing to this thread, here's a pretty good read on the 915 with more power:

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/833762-915-trans-400-hp-turbo-motor.html

TL;DR - If you don't drag race, the 915 will be fine up to about 300hp.

Even with the original, garbage turbocharger (3K 3ldz), the max torque numbers in stock trim were just barely below the max horsepower, but of course, the powerband was very narrow due to the ridiculously slow spooling turbo. Change to any number of available turbos that spool earlier and you then have an impressive, lowish RPM ground pounder on your hands. No need to change the fuel delivery system for that.

My gear width picture on pg 2 of the linked thread tells the real story. It's not about shifters or bearing plates or even ring and pinions. It's gear size.

Matt, I remember reading your posts about this in the Turbo forum some time back (along with pictures), and it really helped to explain why the 915 is a poor choice for a 930 engine (even with the typical mods that people try to do to them) - really learned a lot from you about that.

In the interest of actually contributing to this thread, here's a pretty good read on the 915 with more power:

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/833762-915-trans-400-hp-turbo-motor.html

TL;DR - If you don't drag race, the 915 will be fine up to about 300hp.

The trouble with this is that the 930 engine will make over 300 hp with very little work done to it. For example, if the OP does not run the stock USA catalytic converter and muffler combination, he will be at, or close to, 300 hp, and if he chooses to use a better than stock turbo & intercooler, he'll be well beyond that mark.

Don't forget the oil tank, it has an extra fitting for the scavenge pump line

A simple, and MUCH improved over factory, fix for that is to run the scavenge pump discharge hose to the crankcase breather cover (a hole must be drilled and a fitting added, of course). That way, the oil from the turbocharger is no longer dumped into the oil tank where it is then sent into the engine unfiltered (potentially sending oil coke particles throughout the engine - plugging the cam spray bars is the most noted result). That was definitely a horrible factory design that many have suffered from . . .

That's not so good, right?

I kind of liked the "keep the original" 915 post. Made sense except for not being able to use the engine's power except for over 50 mph in a straight line.

It sounds plausible but you are handcuffed.

That's not always a bad thing, right?!?! :)

http://ginnymarsh.co.uk/wp-content/u...07/CR-4792.jpg

That's my younger sister. Where the hell did you get that?

Calling her now. Furious.

I just took that picture - he he he! Sorry bro, but I just couldn't say "NO"!

My little 275 HP SC hasn't killed the 915 transaxle yet. I do have to yank it pretty hard into 2nd, however.

Have fun. She's pretty easy.

Stealing a movie line, she says I kiss the best.

<iframe width="420" height="315" src="https://www.youtube.com/embed/AOXQTr_3IVw" frameborder="0" allowfullscreen></iframe>

So I do have something to add. I did in the 930 forum but somehow no one looked there.
Anyway, you'll need
I'm doing it now as well. For sure the axles are not the same, the length of the trans will probably cause some interference at the tunnel area, and the trans support mount is not going to line up among other things. Clutch cable, shifter etc..
It's doable but not today my friend.
You need carrera axles from 86-89, a 930 clutch cable I believe, 930 shifter, and then you need to molest the trans support for it to line up. Once it lines up you most likely will be hitting the torsion tube with the front of the transmission.
Keep us posted please good luck.

I would love to hear more on this idea. Not to hijack or side track this thread, but is there any recommended threads on this?(more stout modded 915). I'm boosting a 3.0 (I know I'm crazy) but I need to break open my gearbox anywho because of syncros and I don't wanna go thru what this poor guy is going to go thru. I had the same thoughts on trying to locate a 4sp but now not sure that's the best idea. :confused:

I would just be scared with the 930 motor/915 gear box set up to give it the beans with no speed built up.

But that's me and I have no base of experience platform to speak from.

Btw the 915 is a hoot with the 930 engine. It blasts to 160 so fast you'll be shocked. But. You'll worry about the lower gears all the time and if you look at me you'll unserstand. I got no more hair. It's all because of that 915 gearbox. And I've been through two of them. They really don't like the torque of the 930 gearbox. I used stock boost too. Even if your at or under 300hp the torque on this engine is more than that. Realistically it's more like 325-350lbft. That's a lot.
This is why I'm going 930. And then my limits won't be 915 gearboxes. It will be fuel but I won't run into any limits till around 400hp so sit n think on that for a minute. With the 930 gearbox you can do that. It's just a twist away from more power with these cars.
I've been in a 3.6 equipped 911sc and it doesn't hold a candle. Turbo power is king!!!
Flame on.