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Gumba11's Avatar
 
Join Date: Feb 2005
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Porsche Crest Pics for the EFI crowd!!!

Hey guys,

As you know I have started the EFI conversion on my 77 930 and its getting pretty exciting, so I had to show you what my fabricator had so far. He came to my house tonight to take some measurements to get the manifold complete this weekend!

I must give credit where it is due. Derek at Power Trip Performance is the man. He can build you anything you need! I will post more pics of my intake manifold because I think this is going to be something the EFI crowd here would maybe be interested in. Maybe for your own EFI conversion.

The manifold is custom from Power Trip and is going to use a 75mm professional products throttle body.

Here's the pics. Please forgive me for including my ugly mug in one of them! LOL!





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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 05-24-2007, 11:34 PM
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Looks good, can not wait to see what is fabricated for the injector blocks and tubing.
Old 05-25-2007, 07:52 AM
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I've never seen a design like that before. It will be interesting to see how it all comes together.
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Old 05-25-2007, 10:03 AM
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Interesting, Looking forward to seeing it come together.

Good Luck,
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Old 05-25-2007, 11:30 AM
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volocity stacks = instant wood
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Old 05-25-2007, 02:05 PM
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Chris,

Might be a lot of turbulence in that intake, why not weld the bell shapes on the tubes directly to larger holes from the outside.
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Old 05-25-2007, 04:23 PM
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Manifold runs up against more than a few concepts of forced induction, but keep us updated.
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Old 05-25-2007, 09:16 PM
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I dont build them. Power Trip Performance does and everything he builds hits the flow bench to see just how it works. I will keep you all posted.

Remember just cause its different doesnt mean it wont work and work well.
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 05-26-2007, 01:09 AM
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True enough. But recall that air being forced into those stacks is likely very different than air being drawn into them.

I'd follow the idea of a Carrera manifold:
Rounded corners, smooth transitions

I almost hate to post these ideas since you already had the part fabricated -.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 05-26-2007, 11:16 AM
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We dont know just how it will flow until the flow test but the manifold from the stacks out will be very similar to a carrera manifold.

Thanks for the supportive comments Craig. I will post more as I know more.

One more thing. This type of manifold has been tested on a Toyota Supra Turbo and had HUGE success over other peoples aftermarket ideas. I think it is going to surprise some people! The Supra had over a 40 HP gain just from switching manifolds. I'd be happy with that, and It should be a substancial improvement over the old pancake manifold! LOL!
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 05-26-2007, 02:56 PM
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Craig, I was thinking of what you said about the Carrera plenum- I think that the carrera plenum has a velocity stack "type" of runners on it. If you look at the casting close enough, it goes from big to small on the legs of the runners. Now the diffrence between Gumba11's plenums and the Carrera plenums are the his have the stacks boxed around whereas the Carrera has them flush and integral to the rest of the plenum. Do you think that this is accurate?
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Old 05-26-2007, 08:51 PM
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Lots of round, flowing transitions in a Carrera, 3.6 or Varioram setup.
Not easy to make by hand.

Or even a stock 930 manifold - though in itself not an ideal configuration whatsoever.
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"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 05-26-2007, 08:57 PM
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I recall a post from Goran (Beepbeep) describing the atributes of velocity stack design such as PTPs. Apparently these flow better than a flush mounted stack. I've seen inside some factory BMW M3 air boxes and they were the same with a free standing stacks.

That thing is going to have some serious long intake runners with a central plenum. Should make big mid-range torque. Interesting project.

Last edited by Jim2; 05-26-2007 at 10:02 PM..
Old 05-26-2007, 09:58 PM
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The stockM3 had 6 throttles after the airbox though didn't it?

At any rate, it should be interesting to see how much power this makes.

Cheers
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Old 05-26-2007, 10:33 PM
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