914-6 creation with 69 911S motor, Carburetor or 69S MFI? Options

[Jett]

We are building a 75 conversion with a freshly rebuilt stock 69S 2.0. I have a set of 914-6 webers that were just rebuilt (jewelry), and the fellow that sold the motor has offered up the injection for it.

I really wanted the sound and stock look of carbs, but my friend said that the injection provides close to 40hp for this motor, and sounds better than carbs??

Any thoughts?

[targa72e]

I had MFI installed on one of the engines in my -6 conversion. Pretty straight forward to get working from fuel system standpoint. The pump just wants to see fuel pressure at a constant 14psi.
Two problems with MFI in a 914 are that there are no provisions for getting heat to the thermostat and the standard -6 sheet metal will not fit.
I used a wide band O2 system to tune the MFI and had it working very well. I had to eliminate the thermostat as it did not function properly without heat ducting. When everything was tuned well for hot running the car would not start when cold. I did not have the auxiliary cold start injection installed. I ended up making a mechanical adjuster in place of the thermostat to start the car when cold.
There are other solutions to make this mechanical with a cable to the passenger compartment for cold start enrichment.



For the sheet metal It needed to be modified to accommodate the pump drive. I had to use a 911 and 914 pieces spliced together to get it to work.
The airbox was also a little tight on clearance so I removed the torsion bars for more clearance but this could of been do to engine mount positioning.

john