Testing D-Jet FI, Got a few questions Options

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I'm prepping a 1.8L engine for the red 914 to replace the leaky 1.7L with one cylinder low on compression that's in the car. The installed engine has dual IDF40 Webers on it now.

When the PO bought the car, it had FI and was not running or was not running good. He took it to a local 356 shop and they pulled the FI and put on a single Weber just to get the car running.

When the 356 shop moved locations, I received a box full of FI stuff from the car. My goal is to test each component and get the FI running again. I've tested most of the components including the distributor contact points, temp senders, throttle switch, and MPS.

For the MPS, I just tested for vacuum leakage. It was leaking pretty badly so I took it apart and sealed it. I'll test it when I test the FI brain.

I got a few questions that I'll get to in a few posts. First question is will it damage injectors if they are operated w/o fuel pressure? I plan to run the brain with injectors dry.

Here's all the stuff I received:

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OK, now I don't know how to interpret this. My understanding is when the engine speed is above 1100rpm or so, when the throttle is closed, the injectors should cut off. This is not what I see.


Below is a shot of the engine at 6000 rpm, MPS under vacuum, CHT warm. The injector ON width doesn't change regardless of throttle open or closed. I thought when throttle closed, I would see the little injector spikes, not normal wide pulses. WTF?




So with the throttle closed, I reduced the engine speed down until the injectors turned off as shown below. This occurred at about 2850 RPM. The injector pulses will remain spikes until the engine speed goes below 1100 rpm when normal injector pulses reappear.

So is this normal behaviour for the engine to cut off the injector pulses between about 1100 and 2850 rpm. Above 2850 I get normal width injector pulses regardless of the throttle position.