Vehicle & Technical > Range Rover
Converting Carbs to EFi
ben-dent:
I have got 2 rangie V8's, the greenlaner is carb'd and off roader is EFi, but i have been thinking that i want some more Fuel Economy,
what do i need to take off the Off roader to put on the Greenlaner, i know i will need all the Manifold, and Throttle body, air filter, Airflow meter and pipe work, but what about wiring looms, ECUs and the likes,
also if i take the ECU (under the seat t believe) can i mount it some where else, higher up?? incase i do take it through water, as i dont want to be replacing the ECU due to water ingress
Thanks In advance
Bowie:
Best to swap the entire engine loom over, and yes, when you have you can stretch the loom & ECU right up under the dash much further away from the lack of door seals :P
You'll also need the fuel pump (higher pressure) fuel filter and possibly the tank (Probably best to swap the lot, it's not a big job).
You may find you need to switch to the EFI dizzy and coil setup, as the wiring is different, and to keep it as 'standard' as possible it would be worth doing for fault finding purposes.
Feed the ECU with power and sorted -pretty much, just label where everything goes when you take it off!
Range Rover Blues:
What carbs have you got? because the Strombergs aren't famous for anything but becoming trouble whilst the SUs are very nice carbs and worth a few bob because of it.
If you are getting lousy economy on carbs, try a new jet kit first (needle and jet etc). The biggest thing abvout V8s is that they cams can wear and this causes high fuel consumption because it screws up the valve timing and lift, even before it becomes obvious with a knicking at the tappets.
With a worn cam or even just cam chain you won't improve your economy that much, if at all.
ALSO, start by fitting the exhaust system from an EFI, not the fuel system, the biggest gain in power on the 3.5 EFi was the exhaust, the biggest gain on the 3.9 was the camshaft. If you want to fit the 3.9 system which is bigger bore you need the later gearbox crossmember which doesn't protect the exhaust as much.
Don't bother retro fitting the 3.5 system either, they can be a lot of trouble.
That said the 3.9 will be running in non-diagnostic mode unless you retor fit a bunch of sensors, it doesn't need them to run but to run at it's best it does.
ben-dent:
--- Quote from: Range Rover Blues on June 03, 2009, 12:23:24 ---What carbs have you got? because the Strombergs aren't famous for anything but becoming trouble whilst the SUs are very nice carbs and worth a few bob because of it.
If you are getting lousy economy on carbs, try a new jet kit first (needle and jet etc). The biggest thing abvout V8s is that they cams can wear and this causes high fuel consumption because it screws up the valve timing and lift, even before it becomes obvious with a knicking at the tappets.
With a worn cam or even just cam chain you won't improve your economy that much, if at all.
ALSO, start by fitting the exhaust system from an EFI, not the fuel system, the biggest gain in power on the 3.5 EFi was the exhaust, the biggest gain on the 3.9 was the camshaft. If you want to fit the 3.9 system which is bigger bore you need the later gearbox crossmember which doesn't protect the exhaust as much.
Don't bother retro fitting the 3.5 system either, they can be a lot of trouble.
That said the 3.9 will be running in non-diagnostic mode unless you retor fit a bunch of sensors, it doesn't need them to run but to run at it's best it does.
--- End quote ---
cheers for the info, i dont have a Problem with the fuel consumption, i just thought i would see if i could get a little bit more economy out of her,
a mate of mine who works for a landy specialist has said similar things about the Cam and exhaust, so i have decided i will keep the carbs on Dent and throw another set of carbs on the other one,
the Current carbs are Strombergs, They are working OK but not the best, bt i do have a set of SU Carbs that i have been intending on throwing on for a while, (already Recon'd by myself) and i have a set of SU carbs and Maniflold in my garage,
Range Rover Blues:
Then that's what I'd do, fit the Sus and get them tuned up properly, spend any time and money you had to hand on fitting a decent exhaust and plugs/ignition service etc. A V8 in good tune running SUs will pretty much be the benchmark for V8 economy anyway.
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