For flat sixes: Webers v MFI v EFI, Ecologically speaking… Options

[horizontally-opposed]

Currently have a 2.2E/S with Webers. It runs well and makes good power, having been tuned on the dyno and further dialed in since then, but I have discovered I'm just not a carburetor person. Fuel economy isn't good enough for the size of engine/car, and the emissions bother me—both in terms of the smells in my garage and while driving the car. And yes, we've been totally spoiled by low emissions cars.

What I'm curious about, for anyone who has lived with carbs and MFI: Is MFI noticeably cleaner and/or more efficient than carbs?

Or is EFI the way to go? I'm in no hurry on this, but curious for the experiences of others. Yes, Motronic, but I actually like the 2.2 engine.

Thanks! (IMG:style_emoticons/default/beerchug.gif)

[Chris914n6]

Cross country I got a little better than 25 mpg with the 3.2 and stock efi. Same as my big Ford Escape. One cause of the lower mileage is the increase in speed limit across the different states. At 85 mph you are way past the inflection of the drag curve. But crossing Nebraska, you feel silly not keeping up with the Jeeps.

My 914 with 97 Nissan 3.0L will do 29 mpg @ 90 mph between Reno & Vegas, stock ECU.

My Nissan 3.5L swap will get full aftermarket FI, MS3Pro EVO. Allows a few different tunes (street, track, highway). I can run a bit lean at 90 mph for mileage or a bit rich for cooling on the track. Also the software has 'autotune' to make initial setup & tuning easier.

You can use whatever intake hardware that fits, as the controls such as TPS MAF/MAP WBO2 TEMP INJECTORS all can be GM or Subaru or in my case stock Nissan.

I'll be all in for about $1500, which is likely cheaper than the dinosaur Porsche factory FI.