Lack of staying power - how do you perform?

steveo said:

In a 96 300tdi 110, with a following wind, in 5th, boost at about 17psi on the gauge, up a hill (not steep...) I struggle to keep 60 mph - in fact up the A23 today on the way back from Brighton, I ended up shifting down to 4th to even manage 50!

How does yours compare?

I have done the following:
tappets
intercooler clean
1 full turn of top screw on pump
90 cw degrees on the diaphragm
90 cw degrees on the star wheel


All pipes and hoses are secure and air tight where they need to be.

I expect more - I had an old 200tdi that could do better....
Shall I put it in the hands of a professional when I get the timing belt done?

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wammers said:

You have possiibly detuned it playing with pump. Don't touch what you don't understand. Sounds like lack of boost fuel.

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steveo said:

possibly, but unlikely, as it is better since I altered the pump. Pick up is quicker from setting off, and it responds better on the flat, but still no staying power on a hill, even though boost pressure stays the same.

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109inches said:

Return the pump settings to factory. If the timing belt needs doing do it and ensure the belt timing is correct with fuel pump timing gear.

I would then personally advise fitting a boost pin if you are struggling to set the boost and fuel manually to get more boost and fuel.

Simple things like when were the fuel and air filter last changed?

To be honest I own a factory defender 200tdi 90 and although I haven't seen the hill in question 60mph doesn't sound too bad for a standard Tdi.

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wammers said:

...Doesn't matter if you have 100 PSI of boost, if there is not enough fuel it will go nowhere.

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wammers said:

A boost pin won't give you more boost, just more fuel for the boost you have. .

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steveo said:

agreed, but wouldn't that also show on the flat?

Still, any comparisons out there?

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steveo said:

In a 96 300tdi 110, with a following wind, in 5th, boost at about 17psi on the gauge, up a hill (not steep...) I struggle to keep 60 mph - in fact up the A23 today on the way back from Brighton, I ended up shifting down to 4th to even manage 50!

How does yours compare?

I have done the following:
tappets
intercooler clean
1 full turn of top screw on pump
90 cw degrees on the diaphragm
90 cw degrees on the star wheel


All pipes and hoses are secure and air tight where they need to be.

I expect more - I had an old 200tdi that could do better....
Shall I put it in the hands of a professional when I get the timing belt done?

Click to expand...

109inches said:

True but if he's running 17 psi of boost that's about standard for a 300tdi. In which case a boost pin will give noticeable improvement at the top end which is, from what he's saying is what he wants. He isn't losing boost from what is being said and thus a pin will give improvement without the complication and possibility of ruining the engine by manually fiddling with fuelling if you don't know what you're doing.

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109inches said:

True but if he's running 17 psi of boost that's about standard for a 300tdi. In which case a boost pin will give noticeable improvement at the top end which is, from what he's saying is what he wants. He isn't losing boost from what is being said and thus a pin will give improvement without the complication and possibility of ruining the engine by manually fiddling with fuelling if you don't know what you're doing.

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wammers said:

No. When do you get max boost on the flat?

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Turboman said:

When were the injectors last serviced. Injector overhaul will boost performance if they are tired and old.
I dont think that is terrible performance, Defender 110 is quite heavy, and only 110 horse with everything perfect.
We went up to the Pentillie do in Marts 200 Tdi last weekend, my memory is it cruised about 70 odd, probably dropped off a bit up hills, even on the main road.

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steveo said:

Better than mine then.....

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steveo said:

So, assuming boost will take the easiest route out of the pipework, measuring it at the pump would give a better idea of what boost the pump is getting, yes?

hard acceleration.....

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wammers said:

So when you use hard acceleration on the flat it goes like a Porsche does it. Max boost will be on hills under load, that is where you take one to do a boost test. As said it doesn't matter how much boost you have if you don't get fuel to service it the car will run out of steam as yours is doing. On the flat it will not be as noticeable.

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