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> Testing D-Jet FI, Got a few questions
Spoke
post Apr 6 2008, 11:25 PM
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Jerry
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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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Spoke
post Apr 7 2008, 12:00 AM
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Jerry
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Here's the brain with all its components connected. I want to run the brain with the distributor spinning with a drill. This is just to make sure the distributor works.

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This is the "engine block". It was made from a small piece of 22ga steel. I put a series of cuts in one side and bent up every other tab to form several spades for electrical connectors. On the right is the CHT sending unit.

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Here's the power connector for the brain.

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To test injectors and distributor functions, I made some extenders out of 0.016in brass. Again with a piece of wood and hot-melt glue, connectors were made. These allow easy measuring of signals. The one with 3 leads is for the distributor.

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Here's a shot of the drill driving the distributor. This worked but the drill lacked the ability to remain at a certain speed and the drill caused annoying spiking on the scope. The drill + distributor has been replaced by an electronic circuit.

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Here's injector #1 with an extender for measuring injector voltage.

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The CHT sender did not have a connector so I made one from brass and soldered the CHT sender to it.

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