110 V8 conversion to 300TDI

Ive had various V8 RRcs and I doubt any made it to double digit MPG. My 90 was V8 now its a 300tdi, the 110 Csw im in the middle of a chassis change was a V8...itll be a TD5. No point in having them if they guzzle so much fuel you cant use them.

Richardv8i said:

Where do we find these “3.9/4.0 or 4.6 EFI unit”s? Thank you.

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Assuming you are in the UK. eBay is often a good source of engines or a breakers.

It might even be worth buying an entire Disco 2 or p38 RR and breaking it for the engine and selling off the bits you don't need.

Richardv8i said:

So could I put a newer 4.0 EFI in my 2000 disco 2 v8?

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2000 should be a Disco 2, which would have a 4.0 RV8.

MPG improvements are hard on the V8, more about driving than anything else, but they will never be the most frugal due to the weight/size of the vehicle.

Power can be improved however, no matter what V8 you have. A 4.6 could be retro fitted or you could put a different cam (plus other mods) to the 4.0.

Stock they are quite detuned with circa 182bhp from a 4.0, the 4.0 litre should be good for 200-230hp in a Discovery with some mods.

EeEk said:

Ive had various V8 RRcs and I doubt any made it to double digit MPG. My 90 was V8 now its a 300tdi, the 110 Csw im in the middle of a chassis change was a V8...itll be a TD5. No point in having them if they guzzle so much fuel you cant use them.

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Sounds like there are some heavy right feet around

I've owned four RRC V8 autos (one 3.9 & three 3.5efi) all bog standard & always got decent consumption, for a 2tonne perm. 4x4 brick. My current '87 has returned 22+ on a 600 mile round trip to Wales from Essex & I wasn't driving Miss Daisy, cruising at 70 on the M4 for much of the journey. Local rural driving averages 17/18 mpg.

nb. these figures are full tank to full tank calculations, not guesswork from fuel gauge indications.

norseman said:

Sounds like there are some heavy right feet around

I've owned four RRC V8 autos (one 3.9 & three 3.5efi) all bog standard & always got decent consumption, for a 2tonne perm. 4x4 brick. My current '87 has returned 22+ on a 600 mile round trip to Wales from Essex & I wasn't driving Miss Daisy, cruising at 70 on the M4 for much of the journey. Local rural driving averages 17/18 mpg.

nb. these figures are full tank to full tank calculations, not guesswork from fuel gauge indications.

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Agreed. Anyone claiming BS about never getting above single digit mpg figures is talking out of their arse or had a broken vehicle.

Got a lift, MT's and modded exhaust on my 4.6 p38. MPG has dropped from stock, but it is still 15-17mpg running about. And just shy of 20 on a run.