New ECU and Harness Wiring

Mac

Mac

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I'm treading in somewhat new territory in building an engine harness. I am replacing the old Stinger ECU with a FuelTech system. Most of the harness build is self explanatory but things like my fan on my intercooler have me confused. When you turn the car to "ON", but not start, the fuel pump and the intercooler fan run for 5-6 seconds and then shutoff until started. The FuelTech has a fuel pump circuit set up so that is taken care of. I assume I need to set up another timed circuit for the intercooler fan. I know it needs a 40amp relay on it.

For the coolant fans on the radiator, I'm going to splice those together on one circuit. That is also already taken care of on the new ECU.

Any thoughts or experience on this?
 
just use the same fuel pump circuit for the intercooler fan

1 relay for fuel pump, 1 for intercooler fan and use the same ecu output wire to run them both
 
I would run independent relays for the fans. It’s a lot of load on a single relay/ATC fuse, and if something goes wrong, your whole cooling circuit is dead.

Also, relays don’t seem to be awesome lately. This was running a single BD Onyx6+ 20” light bar:

1731616118231.jpeg
 
Mac said:
I'm treading in somewhat new territory in building an engine harness. I am replacing the old Stinger ECU with a FuelTech system. Most of the harness build is self explanatory but things like my fan on my intercooler have me confused. When you turn the car to "ON", but not start, the fuel pump and the intercooler fan run for 5-6 seconds and then shutoff until started. The FuelTech has a fuel pump circuit set up so that is taken care of. I assume I need to set up another timed circuit for the intercooler fan. I know it needs a 40amp relay on it.

For the coolant fans on the radiator, I'm going to splice those together on one circuit. That is also already taken care of on the new ECU.

Any thoughts or experience on this?
Click to expand...
Which ECU are you running? 450, 550, 600..
 
Kraut_n_Rice said:
What does your Output table look like?
Click to expand...
Haven't built it yet. I was playing around with it but haven't done anything yet.

I'll be getting more serious in the next couple weeks and hopefully get a starting point so I can get the harness laid out.
 
Mac said:
Haven't built it yet. I was playing around with it but haven't done anything yet.

I'll be getting more serious in the next couple weeks and hopefully get a starting point so I can get the harness laid out.
Click to expand...
Build the engine set up first, inputs/outputs, not necessarily the fuel/spark. It will lay the harness out for you. Takes a bunch of the thinking/planning out of it as it will configure it for you.

Example of mine.

1731641382580.png
 
It took me two try’s to wire the fueltech in my car. Some was lack of laying it out first, some was lack of total understanding. There are some features that are not very clear at all. Some features are missing if not selected. I got this figured out now. I removed a lot of harness that I did not need on the second go round. I left extra wires but now need to add a crankcase pressure and parachute output. Will be converting the dragster from mechanical injection to fueltech after first of year. We have been impressed with the results. First pass at track was the cars fastest pass ever, still on a safe tune, and a serious improvement in oil dilution.
 
The Fueltech tech service is top notch. They have guys around the globe, so if you hit the "chat" button a 1am on the website a guy in Australia will probably reply.

When first setting it up you have to make sure you "check" all the options you want. Otherwise, they are not visible to edit. For instance, I don't have Boost activated output #2 selected. I can set up the input and output pins, but I won't be able to configure the triggers as they won't be in the menu to select.


1731644707602.png
 
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