Disco 2 Wastegate strange behaviour

sierrafery said:

that does make sense, what doesnt make sense is that in that situation it doesnt go to overboost... you might have a point with the messed up fuel map though so find a way to fit the gauge to the inlet, eventually tap into the EGR bypass tube

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So I connected a boost gauge as you can see in the photo. When I see a sustained 225-227kPa on the Nanocom the gauge shows 240kPa.

No photo in your post but if you tapped into the inlet and you trust your gauge you need a new genuine MAP sensor or if that's ruled out as well the problem is with the fuel map

sierrafery said:

No photo in your post but if you tapped into the inlet and you trust your gauge you need a new genuine MAP sensor or if that's ruled out as well the problem is with the fuel map

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I tried another MAP from another TD5 and it showed exactly the same figures on the Nanocom. So I guess the fuel map is suspect.

Can you borrow an ECU with a standard map to rule out yours being fiddled with?

Spong said:

Can you borrow an ECU with a standard map to rule out yours being fiddled with?

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That is an option but I don't want to mess up with another person's ecu

Michalis Karatzis said:

That is an option but I don't want to mess up with another person's ecu

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I was going to suggest getting a used one from ebay but just had a look to see how much they are......
Forget that idea!

I was planning to get a remap but before that I wanted to sort this issue out. Maybe I should go ahead with the remap and hope that it will solve the problem.

Michalis Karatzis said:

Maybe I should go ahead with the remap and hope that it will solve the problem.

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That's a bit like burying your head in the sand.

Shimsteriom said:

That's a bit like burying your head in the sand.

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Wishful thinking...

Shimsteriom said:

That's a bit like burying your head in the sand.

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I can see the logic there - if the map is corrupt or just plain wrong, a remap should correct it, but I would put the actuator etc back to standard first.
But you're right, it's still a gamble!

As log as the gauge is accurate, there are no leaks and with how the wastegate is tightened to max it means that there's no wasted pressure and that 240Kpa is all the pressure you get so i see two scenarios: the turbo has a problem and can't deliver more no matter how fast it spins or the engine is underfuelled.... a normally working td5 even on stock fuel map should go to overboost with closed wastegate at max 3000 rpm under load that's a fact

sierrafery said:

As log as the gauge is accurate, there are no leaks and with how the wastegate is tightened to max it means that there's no wasted pressure and that 240Kpa is all the pressure you get so i see two scenarios: the turbo has a problem and can't deliver more no matter how fast it spins or the engine is underfuelled.... a normally working td5 even on stock fuel map should go to overboost with closed wastegate at max 3000 rpm under load that's a fact

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I can't guarantee the accuracy of the gauge but let's say I trust it. The same gauge showed a max of ~255-260kPa before the intercooler when I connected it to the line going to the modulator. The turbo was visually checked and blades/bearing looked healthy. The only thing I have no way to check is the fuel map. I wanted to get a remap from Storm Tuning for some time now but first I needed to figure out what is the issue at hand. Maybe I should go ahead and see if it solves the issue.

Wonder if an LR or other 4x4 garage near you has a standard ECU they could plug in, set to your vehicle then test it. That would eliminate it if the problem is still there.
Or maybe they could read your map and tell you if it is standard.
Me no expert, but it seems a commonsense thing to do.

Long thread so i dont remember but if it's MSB ECU not NNN the map is not visible via OBD port only if the chip is removed and inserted into a chip reader

sierrafery said:

Long thread so i dont remember but if it's MSB ECU not NNN the map is not visible via OBD port only if the chip is removed and inserted into a chip reader

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Told you I was no expert on electrics! But still, a garage might have a standard replacement ECU they use for elimination purposes, if not i would wonder why!

I have a 10p ECU if you want to try it.

Alpinejim said:

I have a 10p ECU if you want to try it.

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Thank you for your offer but I will probably get a remap on my existing ecu.

Michaelis, as i am stil underpowered as wel I follow this thread. Does you’re car has an exhaust filter?

My egr was blanket just before the car was sold to us don’t know the history but it was driven short blocks round because the exhaust filter was jammed with clutter.

There should be more power somewhere but now it drives like a normal car even up hill top speed is only 130kmh could be doing more I think.

Good luck on the search! & grtzz