GDI for A/C VW

[Redline Weber]

The VW air cooled cylinder head is EASY to "twin-plug".

My quest is to find interest when a GDI is placed in that location, the location of the second sparkplug.

Lance

[helowrench]

Yes, yes there is.
For several reasons.

[foreverska]

That sounds sick. I doubt I'd have the budget for such a conversion but I'd buy it if I did.

[Stripped66]

I'm interested in the application, but don't have enough money to try it, even if you hit the market at a fraction of the current standalone GDI system(s).

I'd much rather have (need!) an ECU that uses both MAF and MAP sensors simultaneously to control fuel and spark. Maybe if this were a feature of your GDI development, I'd be more optimistic in committing to this newer technology.

[foreverska]

an ECU that uses both MAF and MAP sensors simultaneously to control fuel and spark.

Wait... why? What does that look like?

[Stripped66]

an ECU that uses both MAF and MAP sensors simultaneously to control fuel and spark.

Wait... why? What does that look like?

VGT = variable VE at any given MAP/RPM bin.

[foreverska]

Well sure but MAFs don't hardly care about VE. As long as you have a hot enough MAF it will take some boost. I mean a MAP signal is still useful for timing I'd swear MS could do that... as it is you can hybrid MAF and MAP in microsquirt.

[Piledriver]

Orbital style (Mercury outboards, ~200 PSI compressed air assist) or Delphi style (using very high pressure fuel)?

The former would be trivial to do, as the current multi-fuel Oribital injectors essentially use bog standard fuel injectors as the fuel metering device into the air injectors. I worked through an exercise figuring out what was needed, from an I/O and timing requirements standpoint.. a pair of MS2s could pull it off with a third MS1 or 2 for ignition. (MS2 allows CAN)

An MS3 or other equally capable system could very likely run an orbital setup directly.

Orbital will not even talk to anyone except OEMS, which is odd since they spent the first decade of operations working out of the founders garage, I hope you had better luck. It's the ~only way I could to do it on the cheap, and provides better A/F mixing and atomisation, allowing multi-fuel operation.

[Redline Weber]

OK, some interest.

I have an EchoTec GM-GDI fuel pump, a four cylinder pump. (2.5 liter engine)

Where could I locate this on an AC engine ?

Lance, BTW just bring the FORD MAF (0-5 volt) signal into an AUX channel.

[Piledriver]

IIRC the Delphi GDI pumps are similar to common rail diesel design, being cam lobe driven.

If you could post up a picture perhaps someone will have an idea.

[socrace]

Lance,
What you have probably uses a 4 lobe 3mm lift drive cam. I think loading would probably destroy ordinary distributor gears. Also, pressure solenoid signal is pulse width and phase modulated to the lobes, so no slop wanted, although maybe not that important for race apps.

[Dale M.]

VW heads used in aircraft already have arrangements (machined) for twin plugs..... So machine work might already be done for head ....

Dale

[Passatman]

Very much interested in this. Some people thought that coil on plugs couldn't work on aircooled cars but time has proven that they are a god sent.

Always thought about direct injection on a air cooled engine, glad to see someone more technical than myself looking at it also.

One thing to consider though. I read somewhere, where the vw golf FSI engine had some failures due to carbon buildup under the valves, seems like the injectors where pointed too much on the valves.

[Passatman]

IIRC the Delphi GDI pumps are similar to common rail diesel design, being cam lobe driven.

If you could post up a picture perhaps someone will have an idea.

Pile have a look at this.
http://delphi.com/about/news/media/pres ... 10_11_001/

[Passatman]

More stuff.
https://www.youtube.com/watch?v=hybKYFUOs3Q