converting a 3.0 to a turbo

[80sc man]

I was wondering what all is involved in converting my 80 sc mtor to a turbo. I am in the middle of a rebuild, and found out that i have alusil cylinders, so I would think that I should make some mods since i have to get new cylinders. Any favorite engine combos that are out there???? Please let me know your thoughts on what i should and can do to this motor..THanks

[beepbeep]

you can do everything...how much money do you have, how handy are you and how much power do you want?

[80sc man]

I have good handy skills. This is my first porsche but i have built a couple of motors over the past couple years. I want the most power I can get for the money. I don't really have a set amount of money that i am willing to spend, but, I think I could swing around 4 or 5 grand. Thanks

[curlesw]

Check this out;

http://forums.pelicanparts.com/showthread.php?threadid=9788

Wayne C.
83 SC

[ckelly]

I don't know, looks to me like if you're going to "swing" 4 or 5 grand, you'd be better off doing the 3.6 transplant. More power, better reliability, maybe cost less if you can sell your 3.0 for the right price.

Just a thought.

[masraum]

I don't know that you will be able to turbo the thing and get new cylinders for 4 or 5 grand. But for maximum power I think you would be best served by forced induction of one type or another. Over 300 hp is easy when you are super/turbo charging, but with a 3.6 you will spend much more and still not top 300 or probably 275.

[dd74]

The more I see 3.6 conversions, the more I like them. Judging from what several 3.6 conversion guys out here have done with their cars (Jack Olsen, K9Handler and a few others), I'd seriously look into this option. If something happened to my 3.0, I'd probably go the 3.6 route.

Superchargers? Turbos? - they can work, but let's face it, the SC motor's characteristics don't mesh well with a edit (turboed) edit 3.0. You'd probably be better off reassembling your SC engine, selling it, and buying a turbo motor. 5 grand may get you there, but I'd realistically budget 8K.

For now, you could do a 3.2 short stroke, but to really make it sing, you'll need good heads, high-reving cams and Webers or PMO carbs. That stuff costs more than a 3.6 engine alone.

If you're handy (I'm not), you could probably get away with a lot of the labor costs of putting in a 3.6. That's probably why it'd be a real good deal for someone like you.

Good luck. Tell us what you decide.

[80sc man]

thanks for all the advice. Does anyone konw of some links to some of the other threads that might explain the 3.2 stroke motor and what all is envolved witht that conversion. Thanks...

[beepbeep]

Where do you live? Is it US version of SC engine? In that case it alreadly has low CR which allows you to use low to moderate boost.

If you have a good understanding of engines and can weld yourself, you can probably do it yourself for 2000-3000$... and i'm not talking about "handy Andy sho can change oil himself" -type of work but making your own headers and intercooler, and assembling Megasquirt DIY-EFI.

So either that or go and buy 3.6 engine if you are not up to task...

Oh, and building a high-reving 3.2L N/A version of SC engine is just a waste of money if you're not building a race engine...you'll get 50-60hp at most and spend a fortune changine P&C's, cams, fuel-injection and god knows what more...

[80sc man]

I live in REston, VA...That is in the states. And I can weld, but i have never done anything like making my own headers. I would definately be up for it though. What shouold i do with my cylinder situation though, because i have alusil. So I guess what I am asking is where do I start here. I am new to the porsche world. I was in the big block chevy world for a while. Thkans

[Superman]

The later SCs had 9.3:1 compression. Too much for boost, I think. Early SCs had 8.6:1. Better there. I don't know which pistons came on the '80 MY. SC engines are otherwise fully "turbo ready." SC engine cases are stamped with a "930" part number.

I too like the 3.6 idea. Am I wrong, or didn't the 3.6L engines come with 260 hp right out of the box. If so, then 300 can't be that tough to achieve. If 300 hp does not give you pleasure, then you need treatment and a support group. Or a Turbo.

[dd74]

Or a supercharged 3.6.

BTW: here's a thread on short-stroking a 3.2.

Short stroke 3.2

There are other threads about this as well.

[rick conrath]

260hp out of the box? The factory did not leave alot of cheap horsepower waiting in the wings. You will pay dearly for the next 40hp. Porsche engineers are not into the mass production line of thinking, such as GM where you can bolt on a hiPo part for a few bucks..

[tsuter]

A 1980SC is just waiting for a turbo.

911SC Turbo

[beepbeep]

Well you start by deciding how long do you want to go.

First you have to know which type of engine you have and what compression ratio it runs.

If it's 930/06 (California engine) it runs 8.5:1
If it's 930/07 (Rest of U.S.) it runs 9.3:1
If it's 930/09 (R.O.W.) it runs 8.6:1

C/R decides how much you can boost. The lower the C/R the more you can boost without pinging. Either that or you need to shave down your pistons. Next step is to decide how much boost you are going to use and chose turbocharger accordingly. KKK K27-7200 works well but Garrett TD04 will also do fit (better?)

Third, you have to decide where you want your turbo and weld apropriate headers (or use OEM "headers").

Fourth, you have to check whether your CIS can provide enough fuel for choosen power and decide if you are going to use stand-alone EFI.

Fifth, you have to make all intake-plumbing and install a intercooler.

Sixth (in case you decided to go for EFI), you need to "map" the EFI on either dyno or on the road. "Mapping" means programming EFI so it gives appropriate amount of fuel for given engine load.

It all depends on you...if you know how turbocharger works, can weld your own headers/piping/intercooler, understand what causes pinging and can install aftermarked EFI it can be pretty cheap (~3000$ in parts)...

Turbocharged SC engine with aftermarket EFI and decent turbo/intercooler could easily give around 300-400hp...But it takes lot's of understanding. I suggest you to pick up some books on the issue and decide if you are up to it.

It's not trivial in any sense and it can get pretty costly...if you feel that you are not up to any of tasks mentioned, getting a used turbo engine is probably much better/cheaper idea.

Also, original 915 gearbox isn't so torque-friendly so it might not mesh so good with lot's of power...

[sewell94]

I say turbo the thing, you could do it real easy, buy a set of used 930 heat exchangers(300) used k26 or k27(200-600), the fuel injection from a 930 with the charge pipes(1k, i have for sale by the way, not to be self serving). Your 3.0 motor is great for adding a turbo, the first 930's were 3.0's, it is very similar to your motor, the compression isn't that high, even 9.3-1 isn't that high for boost, i say get all the stuff you can used from 930 put it on you motor, run 10lbs of boost and be happy with your 300+ hp, My 76 930 has the same brakes as you, i have 915 box that has done great with the turbos power, I love my car, its like a little gokart, by the way my car ran 12.9@109 in the quarter mile, that was on a hot day without an intercooler, so you have the potential to do great things with that motor, if you want more info pm me with your # and we can talk on the phone

[tbitz]

I am going down the Turbo SC route.

My first project was to convert to EFI. This is done using the DIY Megasquirt ECU. The car is currently running and I am fine tuning it now in NA mode. Cost has been around $300US for this DIY project.

I am collecting parts for the turbo now. I suspect the cost of used parts will be around $500US, So the whole thing will be less than $1k.

Note this involves alot of DIY and a lot of patients waiting for the "right" parts at the right price to come up on ebay.

Check the link below for details of my CIS-to-EFI projects.

Cheers,