http://forums.pelicanparts.com/911-engine-rebuilding-forum/895593-efi-systems.html
I've seen lots of ITB system builds as above and I'm no newbie, for T4 and I've built my own motorcycle ITB's and have used Jenvey's and CB on other projects.
What I don't like about ITB's and EFI is running in alphaN or a TPS only system. It was great when I was younger but now that I'm older I want it to run more like a factory performance street car...with power of course.
Right now I have a good running hot street 3.0 twin plug with Weber 40IDA and MSD with a Patrick/Jarvis dizzy, runs great no complaints other than it smells like a carb car.
I just acquired a complete EFI system with twin plug ignition.
I also have a 2nd 914/6 project with a 2.7 engine that I'm planning to build, it will need the other intake and ignition system, so it's either carbs or this system but one of them is getting the FI.
First I know I could just buy a 3.2 intake and be done with it, but that's going to be like $1500 Canadian. Or I could mod a Boxster intake, but I'm a cheap and I like to fabricate things, so I was also wondering if one can make a better tuned plenum system?
BTW my cars are both 914's, so for the most part you can't see much other than the tops of the rain hats.
Here below you see a system for a Subaru being built (aircraft conversion), but I think I would build it more like the later Porsche intakes that have the 2 separate plenum halves. The 996/997 runners are ballpark 14" I have both a 996 3.4 and a 997.1 3.8 intake here, I'll pull them down and properly measure them.
These are mild steel that are then powder coated, I imagine I could do them in aluminium.
Question is would you think the power loss will be so bad that it's a bad idea? Change my mind.
How long would you make the runners?
How straight would you keep the runners? Or would you curve them more like 996?
Mild steel powder coated or aluminum? Why?
Has any one already done this? Linky please?
If it such a bad idea I can always do a triumph TB build, sort of like what I did here:
914World.com - The largest online 914 community!
I'm not in a rush, I might not even start this till next winter, I just want to see what ideas come from this group.
Yea or Neh on the plenum?