Putting an '87 930 engine into a '77 911s

[laughac]

After my BAE turbo caused piston failure I decided to pick up a 930 engine for it's stronger bottom end.

I don't need more than 275 hp and prefer to drive twisties instead of trying to hit 150 mph.

That said, I'm planning the install and wondering what challenges will need to be met.

The 930 engine did not come with a Lamda computer.

With these goals in mind, I hope to use as many of my original systems as possible.

If not, who can help me build a list of parts, such as...
1. Different oil lines? (I have a front oil cooler already)
2. Different fuel lines? (I have purchased a Bosch 044 as a rear pump)
3. Different wiring? (I have an MSD 6-AL installed with boost retard)
4. Different clutch parts? (I have a Kevlar clutch already on my 915 trans)
5. A Lamda computer? (the 930 engine didn't come with one)
6. To reduce the complexity and achieve my detuning goals, should I consider using the 2.7 CIS system, the BAE turbo, and SSI exhaust system? I'm thinking of setting the rev limiter at 5200 RPM anyway.

All I want is a very reliable lightweight for the twisties, with a good torque curve and a power-to-weight ratio similar to modern cars. I'm not looking to run any 1/4 mile runs and I want to be gentle with my 915 transmission.

[RarlyL8]

Swapping a CIS 930 engine into a CIS 911 car is not complicated as many of the systems are similar and compatable.
One thing that pops out; 925 trans? Sporto? Really? The gearing may be better (for a turbo) than a 915 but the driving experience will be a tad unusual.
I wouldn't worry about the power. Leave the 930 engine stock and all will be fine. Strip off the smog crap ditch the Lambda and simplify. The stock lag is huge and power curve short which will be easy on the tranny. What tears up a 915 is shifting the gears hard and clutching.
You don't need to change any wiring or add an MSD. Use all the stock 930 components.
Very interesting combo, looking forward to your impressions when finished.

[laughac]

Sorry about that typo.

It has a proper 915 trans.

[RarlyL8]

OK, I should have figured that. Is the 915 aluminum? Some of the '76/7 S trannies were aluminum and some magnesium.
I really wouldn't de-tune the engine. The '87US put out 282FWHP which is fine for the 915 to be used in the twisties and not the drag stip. My first 915 lasted 10 years in front of a 300WHP 930 engine. I hurt it at a drag strip ...

[laughac]

Not sure if the trans is alum or magnesium, but MotorMeister rebuilt it in 2004. They also rebuilt the 2.7, so I'll peer into that case soon and report what I find.

Where should I set the rev limiter on the MSD? 5500 RPM?

[laughac]

I'm in Spring Hill, TN, so you're not far away.

We're planning a startup party in Murfreesboro March 19th-20th.
Join us if you like.

The reason I keep my Porsche is not only because I enjoy it's uniquely fun handling, but also because the P-car owners are such great people.

[fletcher0780]

7000 is the factory centrifugal 930 rev limit i believe, although I'd stick to 6500.

[quattrorunner]

Sub

[RarlyL8]

I agree with Fletch, 6500 is a good spot. Power drops off after 5500 with the 3LDZ and J-pipe but with the 915 you'll want the extra revs to compensate for low gear driveability. My engine was rebuilt with ARP head studs and rod bolts so I could use the 7200rpm rev limiter. The tires bust loose in 1st and 2nd real easy and instantly bang the rev limiter.

[laughac]

We've moved the engine swap party to my house in Spring Hill, March 19-20th.

We have a few Porsche guys and several others planning to attend. One guy is to bring 20 lbs of rib-eyes and another is a chef, so we will eat well. The theater room will have a dozen episodes of "Top Gear" to watch whenver we need a break.

Let me know if you're interested in joining us.
The plan is to use the proven 2.7 parts until the 3.3 is proven, and then to decide whether to get the euro CIS head or jump to EFI.

~Chris

[Hads930]

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