Originally Posted by JameyXJ6

I started thinking about the mods I've made and decided to make a list.
So far I've:
*Swapped engine from the original 83 to an 85. The 83 had blown head gaskets and unknown damage from heat, so I picked up a low mileage V12 from an 85 and just switched the intakes and externals.
*Removed A/C compressor, lines and cooler. I live in northern New England and it's a convertible. I'll only have it out on days when I can put the top down, so the A/C is kinda pointless.
*Removed air pump, idler pulley, airtubes, tapped and plugged air injection holes in intakes with allen screws.
*Removed cruise control bellows. (I prefer my foot on the pedal!)
*Removed Lucas alternator and replaced with higher AMP GM alt.
*Gutted the insides of the downpipes and hollowed out cat-converters.
*Removed factory mechanical fan and replaced with electric.
*Replaced fuel injection harness and most all of under-bonnet wiring.
*Upgraded ECU
*Replaced 15" wire wheels with Jaguar 16" mag rims and 235/60/16 tires.
I'd guess I've probably easily removed over 200 lbs of "stuff" with the above mentioned mods.

Next on the list is to remove factory fuel regulators and replace with single adjustable regulator with built in gauge.
Replace factory airboxes with cold air intake and low restriction air filters.
I've got a few other things on my list I plan to do as well.

Originally Posted by Greg in France

Let's find out!

I think that the injectors fire in 4 groups of three, so are the BMW versions wired the same?. If so, that would be 2 wires for each group = 8 in total?

If this is correct, then you just carefully ensure the new harness wires go into the same places as the old ones did on the power resistor?

Greg

Originally Posted by Mish_Mish

This list almost identical to mine, except I still have original alternator, but my starter is gear reducing Nippondenso (awesome improvement).
Do you mind telling me that Upgraded ECU exactly means?

Originally Posted by JameyXJ6

I went from a 6cu to a 16cu. It was on the later models.

Originally Posted by Mish_Mish

I heard that 16 CU does not work on HE that easily, did it plug and play into '83?

Originally Posted by Greg in France

The 16cu is an exact swap for the 6 cu. It has more reliable circuitry and I think more modern, than the 6 cu. This info comes from AJ6 Engineering, the foremost authority on these matters, AFAIK.

Greg

Originally Posted by Mish_Mish

Ok, I just bought one: JAGUAR XJS V12 LUCAS ECU ECM FUEL DAC4118 16cu 84526B | eBay
Hope it works, or you'll owe me a coffee and croissant

Originally Posted by Mish_Mish

I heard that 16 CU does not work on HE that easily, did it plug and play into '83?

Originally Posted by warrjon

My 89 has a 16CU from the factory.

Originally Posted by Greg in France

It will be a pleasure! If I am not passing by your way shortly; I will fax you $20!

Greg

Originally Posted by Mish_Mish

Got it in the mail today, car runs! It does not hold idle as good and it seems a bit rich on the mixture, so I assume some tuning is in order.
Overall, it is a success, thanks!