Suspect it's slow...

Quote:

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Originally Posted by Tombie

No change with MAF disconnected and lethargic tends to indicate a few potentials.

I’d like to see it on a diagnostic (Nanocom etc) for some MAF readings.

Also, some free and easy checks:
Bypass WGM direct to turbo
Check Wastegate can actuate freely.

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Evening all, bit of an update.
First, in response to the above - decided to by something for diagnostics, figured it'd pay for itself quickly, and a hawkeye came up cheap so I grabbed one.
MAF readings:
- Idle - between 57-62, which from a brief read is fairly normal?
- Flat out up a hill (between 2800-3100rpm, don't think my car would get the rpm far past that, mayyyybe 3500) - 530-540 (never quite got to 550 I don't think).
Possibly slightly low? Or still WNL?

Manifold intake pressure - under hard acceleration it was getting into 190s, don't think i saw over 200. Is this also a little low?

Cylinder balance - 3 gets 8-10rpm out around 2200-2400rpm, when in neutral, but on the road this wasn't showing up, interestingly. Still runs rough/down on power in that rev range.

Thanks for the suggestions re turbo impeller and injector seals. I had been having thoughts about the injector seals, but putting it off due to being a slightly bigger task.

I've got an EGR blanking kit so I'll get onto that as next step and see how we go.

oh, one other thing to add - I had a high air inlet temp fault. But I don't know what the actual value was. Any ideas on the norms for that?

Cylinder balance is only meaningful at idle

EGR delete done 👍

Quite enjoying the learning process so far, chasing these issues is definitely helpful for generally learning how theses things work.

No real different from removing EGR, as expected.
Ran it on Hawkeye again. Still not getting manifold pressure over 200, max around 190. I know that isn't a precise measure of boost, but from my reading it is lpw, should be getting maybe 225? (Ambient reading 95-100)?
Can any confirm or dismiss that?

MAF also not getting above 550 - again from my reading that see a little low/does not pass a MAF test. Again, anyone feel they can confirm or dismiss that?

Yes , boost will be low if you've bypassed wastegate modulator, shorten the actuator rod by 3 turns ( mark the knurled nut before you start ) this should get you in the ballpark wrt boost and correspondingly should raise air flow ....it'll go better too.

Quote:

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Originally Posted by Lemo

There's a thread on this already, use your search for td5 vibration should pop up?
But there isn't really a solution, after the 100th something post of try this and that no one has a solution where they change something and it fixes it! Just appears to be present in some of the td5's....
I'll try link the thread for you later[emoji106]

Lemo

[URL]https://www.aulro.com/afvb/discovery-2-a/100404-ultimate-solution-td5-vibration-knocking.html/[URL]

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Thanks Lemo. Wow, what a thread. Read many, many, pages of it, as you say, nobody has a definitive answer.

Quote:

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Originally Posted by discorevy

Yes , boost will be low if you've bypassed wastegate modulator, shorten the actuator rod by 3 turns ( mark the knurled nut before you start ) this should get you in the ballpark wrt boost and correspondingly should raise air flow ....it'll go better too.

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Gave this a crack.
Shortened actuator by 3 turns.
It is going slightly better, but still the boost seems low. Maxing out around 205kpa (ambient approx 95, so that's 110).
Considering that is with 3 turns on it that seems low, quick skim of other threads has people hitting much higher numbers with that kind of adjustment.
It's certainly miles away from the 245 or whenever it is the the ECU intervene.

I have a alternate MAF coming (used but genuine one, from a car that was running well), see how that goes....

Will replace the WGM also, bypassing that was something that helped, if only a small amount, so hopefully a new one will help.

After that.....hmmm... Turbo hoses? Other ideas?

Aap should be around 100 , has the Hawkeye shown any faults for this?.
If the aap sensor is faulty or clogged it can limit boost pressure to 1 bar

Quote:

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Originally Posted by discorevy

Aap should be around 100 , has the Hawkeye shown any faults for this?.
If the aap sensor is faulty or clogged it can limit boost pressure to 1 bar

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No faults so far.
The ambient is reading generally between 94-96, which I took to be pretty close to right?

Quick update, I know you're all waiting with bated breath...[tonguewink]

Triallrd shortening the actuator more - total of 5 turns.
Achieved slightly higher readings via the map - max around 210 (ambient 96-96)

I then installed a new WGM and ditched the bypass arrangement. Backed the actuator off by one turn (so currently it is 4 turns shorter than stock).
Pressure seems to be rising quicker but max remains 210-215. Ambient today is 93 (slightly lower).

Still seems low, unless anyone thinks otherwise?? I haven't found any clear documentation about the normal readings, but from various threads I've read around this place it seems low.