To force or leave as is.

[quattrorunner]

This is not off topic though it may at first look to be.
I realize that for many the idea of changing their car to other than stutgart specified seems sacrelige, but for others it's just the need for more and must be done. Still, there are going to be those that are riding the fence. I know this because I did that with my other car (911sc targa 1979) and now have come around to try again. The fact is, that these cars can be very rewarding in many ways and leave much left to want in other ways. Power is one way that these cars are, by todays standard, average. In their day, they were pretty hot, but not today. Today, a Kia could hand your butt to you, "here you go". Not fun. And lets face it, kids use us as a benchmark to the performance in their rice mobile. "Hey, it's faster than a Porsche".
Sure, we handle the twisties, but it's not enough for me, and I bet many others as well. Well this is nothing new, I know this, hell we've been doing conversions from chevy small block engines to mazda rotory engines to Electric conversions "EEEK". Nothing new, but do we need to add a lump of water pumping crude detroit muscle iron in the AZZ to get what we need? The answer is no.
May I suggest something? I just finished an engine swap from the 1977 911 engine to 1977 930 engine. It wasn't cheep, but I realized after that it didn't need to be a 930 engine to get the reward I looked for. I had aquired several key parts for conversion from normal asperation on an sc to forced asperation 930 for my other porsche the 911 sc spoken of earlier. I never did that because so many others commented that boost would be too much for the sc engine but with carefull thought, it's not a bad Idea. Right now, I'm only running 5 psi boost and find it very rewarding with my short ratio trasmission. I have the same 6.5 to 1 compression the 930 came with too, so in a sc engine with 8.5 to 1 it would even be nicer and still safe with an intercooler or WMI system.
To do the conversion best, you would need the j-pipe from a euro exhaust or later us exhaust to bolt on a turbo and wast gate. Get the fuel distributor and intake manifld from the 930 which are pretty readily available these days with EFI becoming so popular, and a WUR from the 930 which would make a real easy car to set up and tune. With this and a boost setting of only about 5-7 psi, you will have 300 hp easy. Could be done in a weekend and won't set you back like buying a new engine of any make. No chopping up the Porsche and it's still a Porsche and sounds like a Porsche and drives like a proper Porsche. I'm happy with mine and Just passed the nevada emissions with no issue at all. Done. Awesome sneaky little bas..rd. Thats what I named my car BTW, SLB.


So for those that may be riding the fence, come to the dark side with me, you'll liove it

[Dublinoh]

Nice work..but your license plate takes away some of the "sneaky" doesn't it?

[quattrorunner]

To most, it looks like any other license plate.
To Porsche guys, it's a warning

[winders]

Originally Posted by quattrorunner

To most, it looks like any other license plate.
To Porsche guys, it's a warning

[DRACO A5OG]

Cool, How does she sound on the road? Any sound clips when the turbo kicks in?

[quattrorunner]

I thought it was funny.

Quote de quattrorunner

To most, it looks like any other license plate.

To Porsche guys, it's a warning

[quattrorunner]

Originally Posted by DRACO A5OG

Cool, How does she sound on the road? Any sound clips when the turbo kicks in?

No not yet. I have one video of the day I started it for the first time ( I was pretty psyched). Nothing on youtube yet of driving. I have a pretty good camera I could have someone hold though, I'll have to do that. It sounds absolutely mean. My mom said "how is it sneaky when it's so loud"? Good point.

[tobluforu]

Very cool, no IC?

[Tippy]

Love the non-IC look. It looks so light.

Do Methanol injection and turn up the boost!

[quattrorunner]

I intend to do that. I'm not saying absolutely no to intercooler but my setup is really safe without, after all, it came from Porsche that way. Bit the meth will add safety to that. I can't really boost crazy without a trans upgrade. Ah, why not.......915's are cheep

[pavulon]

Originally Posted by quattrorunner

I thought it was funny.

I think it's kinda funny too. However, I think the exhaust pipe fitment alone would be warning enough for people in the know. As for the rest, very few would get it only to realize their error in retrospect...a sort of cold revenge on punks.

[al lkosmal]

I love it.................did you do all the work yourself? It would make a great DIY article.

regards,
al

[quattrorunner]

Thanks. I did the complete job with the exception of sending the heads out to a local machine shop and cams out to John dourgty for regrind. Not without lots of help and encouragement from others mostly on the turbocharging forum and engine building forums. And I used Wayne's book. My intention at first was to build an engine and sell it to buy a car.
I started the build with 2 boxes of engine parts bought from a guy selling on eBay. Eeek I know but we talked it out and I spoke with the shop back east who is well known and felt good taking the risk. I was lucky to find everything cleaned and ready for the most part for a rebuild. It was a low mile engine and seemed perfect for me.
I bough it to build a good sellable engine for whomever used it. That was in middle of 2010. Then late in 2010 I got the bug to find a suitable roller. Found a 71 coupe bought it, found rust, sold it and kept looking. In January 2011 I found a car that seemed pretty good with a tired engine. Bought that, and found it to be a great car and pretty good engine that made good power. So I drove it like that till I was ready to swap them. The rest is history. Pretty straight forward job actually ( not without lots of drama though as its all new to me). So is it doable? Totally, is it fun? Very much, and was it worth it? It is to me.

[quattrorunner]

Have added an intercooler since and will not look back.
This conversion is great and I as of today, still only use 7psi. Awesome boost fun.

[quattrorunner]

Update:
Added meth and raised the boost to .8 bar. Holy cow, it's really at that level where I start to wonder if i've done something unreasonable, it's really scary fast.

[winders]

You don't have enough tire under the car and I am almost certain you don't have enough suspension. But with a sophomoric phrase like "Turbo powa!" in you signature, you probably don't care.....you are likely to blow it up anyway if you keep upping boost level and adding methane.

Scott

[ant7]

Great thread,
Congrats on the conversion, looks to be a very achievable power upgrade for the DIY'er too.
Anthony.

[quattrorunner]

Thats a very rude comment. In fact, I have been very conscious of this application, from making sure to keep power and torque below the physical limits of the trans-axle, to looking at the limits of fueling, cooling, and airflow to and from the turbo, intake and intercooler.
I use an AFR monitor, to watch my mixture, and keep in mind the very low active compression ratio of 6.5 to 1 which is ridiculously low and I kept it that ratio to keep a level of safety that I would never have to question even with no intercooler, but I have an intercooler so I have raised the boost to FACTORY levels of .8 bar. And added another level of safety by injecting water and methanol to go one step further in protecting my investment. So no, I won't be blowing up this engine, thanks for your concern though. At this point, my only worry is the 915's ability to handle the power but if it doesn't, I'll get another or rebuild it and make that stronger.
In the end, if you don't have anything nice to say, even if you infact know what your talking about, don't say anything at all.
BA
PS, I'll add tire width when I have wider fenders.

Originally Posted by winders

You don't have enough tire under the car and I am almost certain you don't have enough suspension. But with a sophomoric phrase like "Turbo powa!" in you signature, you probably don't care.....you are likely to blow it up anyway if you keep upping boost level and adding methane.

Scott

[CCM911]

Nice job! And I would just ignore Buzz Killington(winders).

[UrQuattro]

From where I sit, it sounds like you have really made sure to do due diligence as far as educating yourself on the different technical aspects involved and have built a car that I'd LOVE to have, frankly.

And I think that w/ an intercooler and especially the lower compression pistons (especially them), .8 is probably going to be ok for ya. I dunno if I would go above 7-8psi, but that is just me, and I don't know 1/10th of what you do in regards to how this is done and how well the internals of the N/A engine can hold up to the stresses.

But hell, that has got to be fun. I'm impressed by it.

Michael