Thread: 14CUX modifications for Triumph TR7

Can I also remove the fuel relay from the loom? As far as I can see, the feedback regarding fuel comes only from the fuel pressure sensor.

Just remember that the 14CUX primes the fuel pump for 5? seconds when the ign is first turned on via the relay. This priming is probably important for quick start so you need some control via a relay.

I don't think removing the inertia switch will affect the ECU. It is not strictly an immobiliser as it is an impact sensing switch to cut off fuel in a rollover or crash. If that is the one you are referring to . I don't think any versions of 14CUX had an integrated immobiliser like say a D2.( but I could be wrong)
Regards Philip A

I'm not really an expert on these systems but I managed to fit one to a County V8 from scratch. The 14CUX needs very little off the existing vehicle loom to make it run: battery positive, ignition on, ignition coil negative and engine earth. The ECU doesn't need any other wires to run. The fuel pump relay has, as Philip pointed out, the ability to prime the system before starting. Adapting another immobiliser to it should be childs play. When the main injector fuse blows (or the relay fails) the ECU doesn't see the need to switch on the fuel pump at all, a safety bonus.

I just remembered another thing that you haven't mentioned.

The 14CUX depends on a VSS( vehicle Speed sensor) to step up idle when there is a positive signal from the VSS and there is no throttle input ie when coming to a stop. this prevents stalling when coming to lights.

It also controls injector cut off when VSS=+ , throttle input <50microvolts and revs> 1500.

You don't strictly need it but it is handy to have.
Regards Philip A

Hi,
I have put a 4.6L RV8 into a Triumph and want to install Hotwire EFI. I am hoping someone can answer a couple of questions for me.

Can I simply remove the immobiliser from the loom without having an effect on the ECU functioning?

Can I also just remove the fuel relay from the loom?

Thanks

Michael

G`day ,

the immobiliser /alarm work on the starter solenoid and has nothing to do with the ECU on a RR .

Presuming the use of something else , the fuel pump relay only works with the pump , inertia switch , purge valve and oxygen sensors , so see no reason for not .

With the relay the pump does an initial prime but that would only mean on first start you may need to run the starter a bit longer but i guess it depends on your reasoning for not using the pump relay and what you do with the wiring .

What happened to his original post that I and Beeutie answered.
This is a repeat.
Regards Philip A

Originally Posted by PhilipA

What happened to his original post that I and Beeutie answered.
This is a repeat.
Regards Philip A

This one?
http://www.aulro.com/afvb/european-m...iumph-tr7.html

Originally Posted by PhilipA

Just remember that the 14CUX primes the fuel pump for 5? seconds when the ign is first turned on via the relay. This priming is probably important for quick start so you need some control via a relay.

I don't think removing the inertia switch will affect the ECU. It is not strictly an immobiliser as it is an impact sensing switch to cut off fuel in a rollover or crash. If that is the one you are referring to . I don't think any versions of 14CUX had an integrated immobiliser like say a D2.( but I could be wrong)
Regards Philip A

Thanks mate, I am hoping I can get away with just letting my fuel pump run for a few seconds before cranking to build fuel pressure. I'll see.

The immobiliser is a big black box with black wires running all over the place. I'll post a photo shortly.

Mike