Aditional loom for turbo conversion.
Turbo Mini Forums

Right, be warned this may get a little confusing, so sorry in advance.
I want to make an aditional loom for turbo conversion on my mini, I want to make a loom that I can pic up a live (or 2) and earth and run megajolt and fuel pump, without having to butcher any of my existing loom as When I rebuilt the car I purchased a new one and spent hours re taping and tidying it up, also want to do this so it make it easier for me when I want to remove The mj etc to put back in the minus (minimal making good etc)
I was thinking This would be easilly done possibly with making a loom for the mj gubbins and using one of the switched outputs on th mj to switch a relay to power the fuel pump, the theroy being I would only have a 12v continus live (feeding realy for pump) switched 12v (for MJ) and an earth (or 2) when cranking will the engine be able to fire with what fuel is in the carb/ fuel system to start it and make the 500rpm minimum setpoint of the MJ for the switched output to make the relay? Was thinking of doing this also incase of an accident, the engine would stall and Mj would break the relay feedin the pump, but would fuel lean out be an issue?
Had also thought of using an inertia switch to kill the feed to the MJ , but if I encorperated this would the fuel lean out be an issue as there is no spark?
Sorry if this makes little sence, its one of those ideas brewed up over a few pints in the pub, but any other ways around this greatfully welcome.
Cheers
Shane

Thats just about what I did.. prepare to be more confused--- here goes....

I picked up 12v ignition power from the fuse box. It feeds to the coil of a relay in the boot via an inertia switch also in the boot .. the fuel pump power is taken directly from the battery via the boot relay contacts and a fuse. The boot relay contacts also feed a wire that runs back to energise a coil of another relay up front. So thats loom #1 = 2 wires running to the boot via the rhs roof channel (same route as the water pipe if you have a rear bottle as I do, plenty of room)
So if you turn the ignition on, both relays energise as long as the inertia switch is OK, if the inertia switch operates both relays drop and kill the pump and edis avoiding the possibility of leanouts. I used 2 relays to avoid long runs to supply either the edis or the pump, It also allows you to get a nice clean supply voltage.


Find a good solid 12v supply to feed the front relay contacts it does not have to be switched (the relay does that) but fuse it.. The main loom starts at the front relay contacts, goes into the cabin near the dash, feeds the Edis and MJ (which are are inside the cabin) then the loom comes out through the bulkhead on the left side, runs along the wing drops down to the crosspiece just above the grille, spurs off to the crank sensor and ends up at the coil. I was a bit worried about the length of power supply wire to the coil so ran that directly from the relay along the right wing..

The looms are made of a nice gauge wire with heatshrink tubing inside the cabin and plastic "hose" stuff in the engine bay. I just taped the wires that go to the boot.

Many ways of doing it... thats just one.



Tel

Edited by Turbo Tel on 21st Mar, 2008.

website:- http://www.terryhunt.co.uk

Thanks Tel, think I followed that. What are peoples thoughts on switching the fuel pump relay from the MJ?
Shane

1293 Turbo mini

Stupid question but how? I asume pump will run when oil pressure is made? Was thinking of wiring the pump off the battery fused and on a relay, the relay switched by mj, and the mj would have the inertia switch on the switched live, so if the switch activates will kill mj, which in turn will break the relay, how would I intergrate the oil pressure swithch into all this (and not switch the relay from mj, and still have total power loss to fuel pump and ecu?
Cheers
Shane

If you get a 5 pin relay
85 to oil light switch
86 ign feed
30 fuel pump
87a ign feed

1293 Turbo mini

I take it the nos you have posted there relate to pin no on the relay?
Cheers
Shane

yes mate the numbers are on the relay terminals
when you turn the ign on with out the engine running the pump will not run when you turn the engine over the oil light goes out and the pump starts working with the engine is running:)

Edited by jimmy on 21st Mar, 2008.

1293 Turbo mini

ok, dumb question but why do you need two ign feeds? 86, 87a? sorry, really struggling to get my head round this at the moment, its been a very long day!
Shane

it is up to you you can run a ign feed on 30 or a battery live i just link 86 and 30 together on the ign feed one less wire to run

1293 Turbo mini

Makes sense now, sorry fella, having huge blone moment, where did you buy the relay from, and what amper rating was it.
Thanks for your patients and help
Shane

normal 5 pin relay 20amp well do

1293 Turbo mini

Thanks again
Shane