Older 110 hdi goes better than newer 110hdi?

[Captain Jack]

The 407 puts out 180 and so far is averaging a rather embarrassing 47

Well, I don't know how you do it, 'cos I can't get more than 42mpg and that's driving conservatively. With my "normal" driving, I am averaging 37mpg (33-34 displayed).

[rwb]

I didnt change the ECU so the difference is in the engine not the ECU.

Now that's very interesting. That leaves us with physical differences in the engine, intake, and exhaust, right?

When I first got the older better saloon 406, the best economy I got from it was about 900 miles from a full tank. Typically, it was about 750 on a decent run.

That's pretty much what I was doing.

Welly: I find it perverse to reduce CO2 at the expense of increasing consumption.
Indeed, if you could catch (almost) all of the CO2 coming out of it then you could have a V12 in tax band A.

Captain: Probably years of practice teasing the HDi 90 along on a light throttle.

[azazel]

The only time I had 900 miles out of a necked tank of diesel was on long runs only and religiously sticking to 57mph, no braking and sloooooow acceleration. I had a 5 litre can of diesel in case I ran out but decided on the fuel station. Ive never run out of fuel. Thats a good question, how many miles can you get after the warning light comes on, before you run out of fuel? I think the answers are different for the saloon and the estate.

[Captain Jack]

The max I've done was 806 miles in my 2002 110 but 700 was about the time when the light came on and I filled up.

I think you get about 40 miles when the light comes on but obviously depends on the driving style.

[scotty73]

The only time I had 900 miles out of a necked tank of diesel was on long runs only and religiously sticking to 57mph, no braking and sloooooow acceleration. I had a 5 litre can of diesel in case I ran out but decided on the fuel station. Ive never run out of fuel. Thats a good question, how many miles can you get after the warning light comes on, before you run out of fuel? I think the answers are different for the saloon and the estate.

I've done 500 miles on half a tank before it cost £50 to top back up.... Around here normally though i struggle to get 200 miles for £30/£35.

[azazel]

one connection left over for a sensor located by the injectors

Water-in-fuel?

Did you swap the injectors over?

No, i didnt swap the injectors over. I think it went to the common rail on the scrapped engine but nothing on the salvaged engine.

[azazel]

The max I've done was 806 miles in my 2002 110 but 700 was about the time when the light came on and I filled up.

I think you get about 40 miles when the light comes on but obviously depends on the driving style.

Ive done 70 miles after the light came on in my saloon. I dont know how bad it is if you run out of fuel. I heard that you can get airlocks, but Im not sure how true that is.

[Bailes1992]

You have to also bare in mind the life the engines have had!
Performance can vary massively simply on the sort of run in it's had!

[mjb]

Thats a good question, how many miles can you get after the warning light comes on, before you run out of fuel?

The answer to that is dependent on the individual car, terrain, driving style - subtle differences in the fuel gauge float, the pot it's attached to, how the tank's mounted all play a part. Whether you're pointing uphill or down plays a major part, and if you're on a racetrack you'll be getting vastly less than if you're doing 50mph on the motorway...

The only way to answer the question is to change it slightly to "how much fuel is left when the light comes on", then base it on your usual economy. Either:

1. Idle until the light turns off, then remove the tank and measure the contents
or
1. Carry a jerry can (with an exactly known amount of fuel in it if you want to work out your total fuel capacity too)
2. Drive until the light comes on
3. Reset your trip counter and trip computer
4. Drive until you run out of fuel
5. Make a note of the mpg and distance
6. distance divided by mpg gives you the amount of gallons left when the light comes on. Multiply by 4.55 to get litres.

(optional)
7. Reset your trip counter and computer
8. Use your jerry can to get you to the petrol station
9. Fill to the brim. Note how many litres you put in.
10. Make a note of mpg and distance
11. 4.55 x distance divided by mpg gives you the amount of fuel you've used to get to the petrol station.
12. Add the amount you've put in to the amount you had in the jerry can then subtract the result from step 11. This gives you the total capacity of your tank (and fuel lines, and filler pipe) from brim to empty. Useful to know if you enjoy life on the edge

My old D8 petrol turbo estate would be hiccuping on the way to the petrol station for a 77 litre fill (to the brim), the fuel light came on when there was about 10 litres until empty. When the fuel gauge only made the slightest flinch when you turned the ignition on, I'd have about 2 litres left


When you changed engines, did you also change the cat and turbo? A collapsed cat can seriously hamper an engine, and a slightly iffy turbo might upset everything