Getting more MPG out of a 200tdi

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the_wolf

the_wolf

Well-Known Member
Posts
16,791
Location
Stonehouse, Scotland
How do I do it? I've seen on here before that people regularly get about 30mpg from theirs which is considerably better than mine. On a very good week I can get perhaps 25, highest I've had is about 26 and often it'll run as low as 22. I serviced it fully last week, tyre pressures are fine, no weight or anything in the back so I'm at a loss. Is there anything else I can do to increase it? I drive it fairly sensibly and I don't have a heavy right foot before someone suggests that :).

Cheers in advance
 
Don't use cheap petrol station crap, go to a local garage and get some FORTE stuff (only sells to the trade), it is miles better than anything else.

After that you could wind the pump back a bit, will result in a drop in power but will give better MPG. Also check the IC for damage, fins folded over e.t.c. as this can have an impact on economy.
 
Start with the basics and cheapest things and work your way up.

Driving habits: ease of the right foot, change gears quickly and don't let the engine rev hard. Approach lights slowly so your more likely to have them change before you get there and sail through.

Fuel: buy decent stuff. It is a false economy buying diesel a penny or 2 cheaper from a supermarket. Although all ASDA fuel is to be Esso from now on.

Start by ensuring the engine can get air as freely as possible.

Oil, heavier oils do lead to reduced economy, worth looking into what you are running and running a grade lower.

Injectors could have a lazy spray patterns due to worn tips, this will drastically reduce economy.

What tyres do you run?

Do you have a lot of kit on board? I was always guilty of carrying about a ton of skip chain and D shackles.
 
Jongould said:
Don't use cheap petrol station crap, go to a local garage and get some FORTE stuff (only sells to the trade), it is miles better than anything else.

After that you could wind the pump back a bit, will result in a drop in power but will give better MPG. Also check the IC for damage, fins folded over e.t.c. as this can have an impact on economy.
Click to expand...

I agree with the forte bit, but not the second that's down to driving style.

a dropping the power isn't going to make you use less fuel, your just going to be using 100% of what you have more often, if you have more power and drive with a softer right foot, you might only use 80% of what there (ie the same as the 100% of the lower power.)

winding back the pump will only have an effect if you drive with a lead/heavy foot.
 
I have a pipercross air filter, straight thru pipe instead of the centre silencer, use good quality synthetic oil, keep tyres pumped up and use two stroke oil at a ratio of 150-200 to 1 in the fuel and my TD5 easily returns 35mpg.
 
How easy is it to change the injector tips?

Got very little weight in the back now; I use good quality oil which I get from work (made by fuchs I believe but no idea on the grade). The engine certainly sounds a lot quieter running this oil and she runs better, but still not much better on fuel. I've got a donaldson air filter and snorkel set up, running with only the primary paper filter in it at the moment. I took out the secondary sponge filter to try and improve air draw. Tyres are 7.5x16 Lassa, they aren't great but not the worst in the world either.
I tend to use BP as often as I can as she runs brilliantly on their diesel, if not BP then always shell. I never go to supermarkets for fuel.
 
timtheenchanteruk said:
I agree with the forte bit, but not the second that's down to driving style.

a dropping the power isn't going to make you use less fuel, your just going to be using 100% of what you have more often, if you have more power and drive with a softer right foot, you might only use 80% of what there (ie the same as the 100% of the lower power.)

winding back the pump will only have an effect if you drive with a lead/heavy foot.
Click to expand...

The reason I said to try it is often the pumps have been turned up a bit already, if he is getting poor MPG this may be worth looking into to, your right that less power doesn't mean more MPG but these pumps are so easy to get a few more MPG out of with correct tuning, its not just the spindle though, the preload may need adjusting to make sure its not fuelling pre-boost, if you are unsure on what your doing though its not a DIY job...

If you (the OP) have the skills and are willing then look into doing a leak back test (Google it, very easy), this may show some indication on injector status, I would suspect the injectors would be the main issue for poor consumption as the 200's a very simple engine and the spray pattern is pretty essential...
 
Having looked up the leak back test quite a few sites are saying that this is for starting problems. Any other tests I can do that will determine the efficiency of my injectors?
 
the_wolf said:
Oh and I've got a straight through exhaust as well, with the centre silencer off
Click to expand...

that may have something to do with it only on a small basis.

Jongould said:
The reason I said to try it is often the pumps have been turned up a bit already, if he is getting poor MPG this may be worth looking into to, your right that less power doesn't mean more MPG but these pumps are so easy to get a few more MPG out of with correct tuning, its not just the spindle though, the preload may need adjusting to make sure its not fuelling pre-boost, if you are unsure on what your doing though its not a DIY job...

If you (the OP) have the skills and are willing then look into doing a leak back test (Google it, very easy), this may show some indication on injector status, I would suspect the injectors would be the main issue for poor consumption as the 200's a very simple engine and the spray pattern is pretty essential...
Click to expand...

JG has a point. i was not getting that great MPG and she was smoking like crazy on my 200tdi disco. injector cleaner and turning the pump down and it was fine.
 
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