HDi Performance and boost gauge - NeilT
Having just driven a friends 1.9TD back to back with my 2.0 HDi, I am disapointed that the performance on mine feels so flat, could it be a fueling issue?

I have a 2001 Citroen Dispatch HDi 94bhp, his is a 1997 1.9TD with 90bhp, yet it feels so much more spritley. Mine also seems to have a pinking sounding noise. mine will struggle after 90mph, his will cruise at indicated 100.

Are the Bosch systems on the HDi generally reliable? Can anyone suggest what I use as a signal for a boost gauge so I can at lease check boost pressure.

I must add that I have virtually no smoke, so have ruled out an air blockage.

Further to earlier threads, both 94 & 109bhp versions have an IC, unlike the 90bhp HDi Xantia/406.


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Neil T
E90 BMW 320d M Sport, E91 330d SE Touring
HDi Performance and boost gauge - NeilT
Anyone??

Another thought.... do the HDi's suffer MAF or Air Flow sensor issues? The drop in performancem and lack of power at higher revs feels just like when the MAF went on my old Leon TDi.
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Neil T
E90 BMW 320d M Sport, E91 330d SE Touring
HDi Performance and boost gauge - Dzl
I was similarly disappointed when I swapped my 406 1.9TD for a 406 HDi(90).

Specifically, the HDi seems to run out of puff at ~2000rpm. This is where the torque curve goes flat quite sharply (although the power keeps increasing to ~3500prm.)

IIRC the HDi provides more torque low down. Its certainly easier to push along at low revs in a high gear e.g., slow motorway traffic.

The turbo on the XUD operated from 1800 to 2?00rpm and was very noticeable. I can rarely detect the characteristic surge from the turbo on the HDi. I could not get a straight answer about the operating range of the turbo on the HDi.

The XUD was perky provided you could keep the revs above 1800 i.e., in turbo range. The HDi pulls well from ~1200 so its best to keep to 1200-2000. Either way, it is not possible to be in a rush with a 90hp engine dragging a 406!

As far as I know, the HDi has no connector for attaching a pressure guage.

My 406s have different transmissions, the new one is higher geared, have you considered this?

My HDi is more efficient by 7mpg. This is the most important thing for me. Swings and roundabouts?

There are a number of software updates for HDi ECUs. These may fix bugs as well as changing the fuelling and other parameters. I am reluctant to get an update without knowing what will be changed: For example, sacrificing efficiency for emissions would be a step backwards as far as I am concerned.
HDi Performance and boost gauge - NeilT
I had come to this conclusion too, although I sue theres still an issue with mine. The other day when I drove it back to back with an XUD version, it was really slow. The XUD pulled 77 up the hill, increasing to 83 as the hill flattened out (at which point you have to slow for a roundabout. Mine stugged with 65, even on the flat.
Same thing one on the dual carrigeway. The XUD was straight up to 95 no problem, the HDi takes an age to hit 95, but will hold it.

Take in mind the Dispatch HDi has a quoted top speed of 103, yet down hill I have only managed 102 (indicated), which was 97 on he GPS..... the XUD will show 102 on a cruise, 110 flat out (both inddicated).

Most surprising thing..... the XUD was quieter at all revs except idle.


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Neil T
E90 BMW 320d M Sport, E91 330d SE Touring
HDi Performance and boost gauge - mss1tw
When was the last time the water trap on the fuel filter was drained?

5 minute job, most difficult part was getting the tap to open...

HDi Performance and boost gauge - NeilT
The Fuel filter element was removed, inspected, and refitted recently that improved perfomance slightly. IS the water trap seperate?

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Neil T
E90 BMW 320d M Sport, E91 330d SE Touring
HDi Performance and boost gauge - mss1tw
I don't think so - on my 306, there was just a little black 'tap' that you could undo to drain it. It seemed to make mine a bit pokier and better running.

Mine already had a piece of hose on it, so if you do it make sure you it is there as it can apparently get around the clutch area if allowed to just splash out.
HDi Performance and boost gauge - dieselhead
I was thinking of changing to a hdi but after comparing the performance of the 1.9TD and 2.0 hdi 306, the 2.0 car felt noticeably more sluggish - although it does pull better below 2000 rpm and is more relaxed at motorway speeds.
I actually prefer the surge in power of the old xud engine plus it doesn't cost £1000 + to repair if the high presssure pump fails and I'm already getting 550 to 600 miles on a tank so don't think hdi could improve on that by enough to justify changing over.
 

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