Nova 1.2 SPI Loom in LET Conversion?

[HouseAtreides]

Hi,

Slightly flummoxed as to what Nova looms (if any - though not a carbureted loom) that can be used other than a GSI/SRI/GTE (MPI) loom in an LET conversion. To be more specific, I'm struggling to source a loom from any of the aforementioned Novas (mine originally being a carbureted model), and was wondering whether a 1.2 SPI Nova loom will work in an LET conversion in the same way using a GSI/GTE or SRI car loom would without the complications of a carb/poverty spec car loom?

I have an MPI tank, external fuel pump, GSI fuel sender unit - the lot; just not a GSI/GTE or SRI car loom to mate to (and make less complicated) the conversion.

Any help/advice would be warmly welcomed.

Cheers,
Tony

[Benn]

You have to cut in to every loom inc GSI/GTE looms.

[Edd]

A SPI loom is the worst one to start from

Get,gsi loom is the best

But why not just use a carb one? All the wires are there

[HouseAtreides]

You have to cut in to every loom inc GSI/GTE looms.

It was mainly for the plugs etc., Benn. I'm really not well rehearsed in knowing what goes where, hence my confusion about using my carb loom.

A SPI loom is the worst one to start from

Get,gsi loom is the best

But why not just use a carb one? All the wires are there

Edd, I'm trying to track down a GSI/GTE loom, but not having much luck. Didn't realise my carb loom would do just as well for plumbing into the LET, so will perhaps just run with that given it is uncut and in very good condition.

I sourced this mini loom from somewhere (but can't remember where). To me, it looks like either the fuel wiring from a GTE or GSI. Any clues? What stumps me is the fuse and relay, which lead to nowhere. Then there is the two straps (brown (earth) and red (live?). Can't figure out whether this mini loom needs wired/spliced into the LET loom or what. The loom itself seems the perfect length for fitting to the petrol tank and external fuel pump; yet the relay stops short of reaching the footwell where I would've thought it would connect to something?





I'm also sure that I bought a fuel pump relay for an LET, without really knowing why .

[Benn]

You wont need the plugs from the loom.

You can join the engine loom in the foot well to the Nova car loom by the fuse box.
As far as i can work out you don't need the bit of loom in the pic. Well i've never used that in any if done.

As for buying a FPR for a let, that's good you'll want one. You use the Let engine looms fpr plug and bits.

[HouseAtreides]

Agh-ha, I see. Just a case of attaching the relevant wires from the Nova loom to the LET block, and others in the foot-well and to the fuse box and Bob's your Uncle?

If I don't use the mini loom pictured below (which seems to be for the MPI fuel tank and external fuel pump), how and what do I use for the tank and external pump given that my car (originally being carbureted) didn't have an external fuel pump?

The engine loom doesn't come with many bits, so I'm not sure what you mean when you say use the FPR etc,.

I have just bought a new loom different from the one pictured, which is in the post to me courtesy of Keith Robinson, though won't be able tell whether it will be much the same in terms of wiring, albeit in much better condition, as the one below.




So, this is the loom that came with the engine. Was pretty disappointed with the overall condition of it due to the fact that the engine has been completely remanufactured (hence my reason for buying Keith's LET loom and ECU off him). Nonetheless, I'm a bit confused at what I'm looking at. The wires coming from the loom in the second (lower) picture don't correspond to many of the 'How To' guides description of different wires. There should be a big (thick) red/blue wire for the fuel pump, which on this there doesn't appear to be (at least not where I would expect it to be for using as a feed to the petrol tank and external fuel pump).

Instead, if I follow it from the FPR, it goes into the main section of the engine loom and into the plastic casing which clips onto the injector plugs. Furthermore, there is a thick brown cable coming off the FPR (pictured) which I have no clue about. The thick blue cable has 200 degrees C written on it in small letters, which I presume is the temperature sensor wire, which is all fine and well if it is. But again, I'm not sure. Then, amongst those few wires, blue temp, and green rev counter (presumably), there is a small (thin) red/blue wire, which apparently is the speed signal sensor, (and not the FPR wire), which supposedly I do not use!

So my confusion is, is that if the big red/blue FPR wire from the LET is meant to go to the other thick red/blue FPR wire on the Nova (which mine doesn't have, other than on the FPR on the mini loom pictured below), and I can't see any thick red/blue FPR wire coming off the engine loom to use as a feed, what on earth do I do ?

Absolutely out of my depth here!!

[Benn]

You can use the bit of loom to power the pump if you want. But it might be a bit thin. I ran a new thicker power down to the pump. The ground wont need to be that long either.

Yes its the thick red/blue that is the pump wiring/powering. Can't remember off hand the nova side. But its very easy to find. Sure there's a wiring guide on here, if not here then on MIG.

[HouseAtreides]

Aye, it is a bit on the thin side. Might buy new, thicker, wiring and re-do the mini fuel loom. Apologies for the 20 questions, but what is the ground? Is that the thick brown cable protruding from the FPR (pictured) on the LET loom? Or is the ground simply a(ny) wire (such as the thick red/blue wire) which acts as a feed from a specific terminal, control unit or plug in sending power to perform a specific function? Electronics is really not my forte.

I'll have a look and see if I can find the red/blue fuel wire on the Nova later this afternoon. Generally speaking, the Nova looms seem relatively straightforward to work on with a clear enough wiring diagram, and with any luck once the new loom arrives I might have a clearer idea of what I'm doing, as it was used in another Nova which might go a long way to solving my problem of identifying the relevant wires and therefore knowing what wire goes where in joining the two looms together.

[Lee H]

That first loom you posted is for the two tone horn I think. Definitely not for fuel pump.

[HouseAtreides]

You could be right Lee, but it's odd that it has all the same wire colours (thick red/blue, etc.,) for a fuel pump and tank with a FPR attached to the end of it, then. Moreover, it is the exact length needed to run between the two.