Staring down the EFI rabbit hole again, /6 intake design, Which way around for the 964 plenums in a 914? |
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Staring down the EFI rabbit hole again, /6 intake design, Which way around for the 964 plenums in a 914? |
Mark Henry |
Feb 17 2021, 10:34 AM
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#1
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
One of the locals fell on some hard times, his plans changed and his 930 was sold, so he offered me a smoking deal on an EFI system.
SDS EM5-F /6 system with twin plug coil packs, Siemens 55lb injectors, cold start valve, crank trigger and /6 trigger mount, extra relay outputs (had meth injection), Beru plug wires X2, manuals, base maps, dizzy hole block off, Bosch one wire (Djet) head temp sender plus all the cabling, fuses, etc that are not included with an SDS system. I already have a Wabro 300hp FI pump, a Djet fuel pressure regulator, 14point7 wideband O2 meter and an O2 bung in both headers. This is not a discussion on which Aftermarket EFI system is better, etc but rather on plenum based intake design. I'm not new. I've been playing with a SDS EM4-F /4 system since 2003-2004 that's now on my '67 bug T4 2600cc conversion, I know that ITB's are better for peak HP, but I'm after overall improvement, usable vacuum signal for MAP, drivability, fuel economy and etc. FYI I have also asked this on the bird board here for some more info on the build. This thread shows my /6 conversion a few years back and has all the engine specs here. Plus I've built my own motorcycle ITB's before here. Please I only want to discuss a single TB plenum based intake for performance EFI. |
mepstein |
Feb 17 2021, 10:56 AM
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#2
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914-6 GT in waiting Group: Members Posts: 19,290 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
3.2 Carrera intake. About $500 and good to about 300hp.
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horizontally-opposed |
Feb 17 2021, 11:19 AM
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#3
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Advanced Member Group: Members Posts: 3,432 Joined: 12-May 04 From: San Francisco Member No.: 2,058 Region Association: None |
3.2 Carrera intake. About $500 and good to about 300hp. (IMG:style_emoticons/default/agree.gif) Porsche, looking for total performance as well as peak performance, moved to a common plenum and never looked back. 3.2 setup is good, 964 and 993 setups better, and latest stuff is better still. Only recently, with the 4.0-liter Speedster and GT3s, has Porsche Motorsport returned to ITBs in a road car. And while they are magical, with what I can only describe as "high-resolution throttle response," there is a lot of tech (and calibration) at work in that magic. One road that could be of interest is other normally aspirated production flat sixes with plenums of little to no interest to the air-cooled hot-rodders. Fortunately, there are a lot of them, and I suspect there isn't much demand for these parts from salvaged cars. Think Subaru 3.0 flat sixes as well as flat sixes from 986/996, 987/997, and 981/991.1. Porsche's water-cooled flat sixes had plenums for 2.5, 2.7, 2.9, 3.2, 3.4, 3.6, and 3.8 liters—with and without direct injection depending on displacements—and the plenum doesn't care if an engine is air- or water-cooled. These are light, very nice pieces that were engineered for tight spaces (particularly in Boxsters and Caymans). And if an adapter has to be made to use a later air-cooled plenum, why not make adapters for something even better? And if you can control a resonance flap with SDS… |
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