How do you all have your electric CC pumps wired?

[silverespritse]

I am switching over to an electric CC pump. The internals to the mechanical pump are completely destroyed. I read up on several forums and esprit web pages about the electric CC pumps. LEW uses a wire loom from lotus which I understand, but is the wire loom available??. The pictures of the Dermot wiring on LEW are not clear to me. Can anyone share on the success of wiring up their elec. pump?

[andydclements]

Mine's wired via a relay to a permanent fused supply, with the activation coil energised using one of the many wires that's run via the ignition switch engine run position.

[mchlrodrigues]

It depends on the pump you plan to use and its current load. I run a WC Engineering pump on my '87 HCi. The current draw is low enough that it can be connected to one of the fuel pump circuits.

[Malc Holmes]

I too fitted a WC pump on my '89 SE, and ran it directly from the fuel pump supply. However, the fuel pump performance is very voltage dependant and the small, but significant voltage drop caused by the additional load of the water pump, was, I suspected, adding to hesitation problems I had at the time. I therefore changed the wiring so that the fuel pump circuit now powered an additional relay housed in the rear relay/solenoid box (with suitable reverse protection diode across the relay coil) and the relay contact feeding the water pump via a fused circuit direct to the battery. The change seemed to make a small difference on the Freescan log, indicating that there were slightly less occurances of knocking and mixture going lean.

Maybe best to wire it up via a relay, to be on the safe side.

Malc

[Quicker]

I did this - > http://www.lotusespritworld.com/EGuides/EM...argeCooler.html

[sanj]

Here's a diagram for the way I did mine. Click here for the full-size pic.

Edited January 26, 2009 by sanj

[Vulcan Grey]

http://www.vulcangrey.thelotusforums.com/m...c_chargecooler/

[silverespritse]

Here's a diagram for the way I did mine. Click here for the full-size pic.

Where is the secondary inj. resistor shown in your diagram located (where the R(red?) wire connects)?

Any one have a part number at a local auto parts store for the relay?

[Vulcan Grey]

Actually those pics are of a friend's car.

I intend to do mine slightly differently.

I will wire my pump wires directly to a Metri-Pack 150 plug to fit into the plug that is used for the EBP Valve Solenoid.

This system should be fine for the ~8A draw of the pump, and the 10A fuse is correct as well.

That way I will not have to modify the car, and the pump will automatically turn on when the car reaches proper operating temperature.

I will probably also do a manual switch so I can turn the pump on whenever I want for coolant burping or cooling in the pits, or whatever.

[sanj]

Where is the secondary inj. resistor shown in your diagram located (where the R(red?) wire connects)?

I actually connected the red wire to the orange/white wire at the fuel pump relay, it was just easier to draw it as shown. All of the orange-white wires on the diagram and the new red wire are connected together.

[Vulcan Grey]

Sanj,

I figured out why I can't see your Photobucket image...

My work has it blocked for content relating to "criminal skills".

Edited January 27, 2009 by Vulcan Grey

[silverespritse]

I actually connected the red wire to the orange/white wire at the fuel pump relay, it was just easier to draw it as shown. All of the orange-white wires on the diagram and the new red wire are connected together.

Have you had any problems with fuel pressure, etc. since you added the electric cc pump?

Edited January 28, 2009 by silverespritse

[sanj]

No, and there's no reason to think I would. The fuel pump circuit is only used as a trigger to the CC pump relay, the current that actually runs the pump comes from the battery (wires marked 'N').