Refurbished turbo problems....any ideas?

RAB said:
Maybe the linkage is disconnected internally, although on a Garrett turbo if that happens, it won't bolt together. It's quite tricky to re-unite the parts.

RAB
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Yes I have thought that. Its certainly how it feels. I think its a KKK turbo.

Trevor
 
RAB said:
Maybe the linkage is disconnected internally, although on a Garrett turbo if that happens, it won't bolt together. It's quite tricky to re-unite the parts.

RAB
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Trouble is there is no way I can tell without taking the turbo out and taking it apart.

Trevor
 
Menno said:
@TAABVW Do you have detailed history what happened to the car repair and maintenance wise? How was the car driving before the turbo was send away for Overhaul?

A while ago I experienced similar behavior from my ATL. Long story short, someone put in AMF injectors, including ECU mapping, which is suitable for a wastegate turbo, but did not (duh!) could manage a VNT turbo obviously......

Poor performance 1st and 2nd gear ATL/TDI 90 below 2000rpm.

https://www.a2oc.net/community/index.php?threads/new-6-speed-gearbox-method-passat-11-onwards-myp-gearbox.25919/page-15#post-453268 A separate topic so the 6 speed gearbox topic (link above) will not be hijacked. Sorry for the inconvenience Well, what can I say; I'm very surprised with my ATL...
www.a2oc.net

If a car had multiple owners it's not always clear what is done to it, or if there are choices made on financial grounds. Some owners don't care, as long as the vehicle drives they're happy.
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Read your thread with interest. Don't think I have a replacement engine. I guess I would have to take an injector out to find out what spec it is?

Trevor
 
Menno said:
@TAABVW Do you have detailed history what happened to the car repair and maintenance wise? How was the car driving before the turbo was send away for Overhaul?

A while ago I experienced similar behavior from my ATL. Long story short, someone put in AMF injectors, including ECU mapping, which is suitable for a wastegate turbo, but did not (duh!) could manage a VNT turbo obviously......

Poor performance 1st and 2nd gear ATL/TDI 90 below 2000rpm.

https://www.a2oc.net/community/index.php?threads/new-6-speed-gearbox-method-passat-11-onwards-myp-gearbox.25919/page-15#post-453268 A separate topic so the 6 speed gearbox topic (link above) will not be hijacked. Sorry for the inconvenience Well, what can I say; I'm very surprised with my ATL...
www.a2oc.net

If a car had multiple owners it's not always clear what is done to it, or if there are choices made on financial grounds. Some owners don't care, as long as the vehicle drives they're happy.
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Unfortunately I don't really know how it drove before as I bought it with a very knackered DMF, a huge boost leak and a blocked fuel filter. Despite these faults it does have a half decent service history.......unless the history is faked.

Trevor
 
TAABVW said:
Unfortunately I don't really know how it drove before as I bought it with a very knackered DMF, a huge boost leak and a blocked fuel filter. Despite these faults it does have a half decent service history.......unless the history is faked.

Trevor
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Bought mine with the gearbox locked in reverse, so no test drive here also.
It's always a risk to buy with no test drive, but if you're a handy man you'll get it sorted.
 
Menno said:
Bought mine with the gearbox locked in reverse, so no test drive here also.
It's always a risk to buy with no test drive, but if you're a handy man you'll get it sorted.
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Thanks for the encouragement.....I'm off to the garage to extract a couple of turbos. Ill keep the forum updated with outcome.

Trevor
 
Might be worth swapping the Map sensor with a known good one before ripping out the turbo's

What are they like to change in situ as access looks a tad tight on my 75 at least
 
Howey said:
Might be worth swapping the Map sensor with a known good one before ripping out the turbo's

What are they like to change in situ as access looks a tad tight on my 75 at least
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Yes I have swapped the map sensor. I called it an "inlet pressure sensor" in my original post.

I extracted the refurbished turbo in situ as all the bolts and studs were new since it only went in a couple of weeks ago. I'm quite plodding and methodical and it took me about four hours. I tried the same method with the other extraction but predictably since the turbo had likely been there for 17 years it was a different ball game. I ended up taking the front off and disconnecting the right side engine mount, supported on a chain and swung half the engine out to gain sufficient access to defeat the stubborn nuts and bolts. Needless to say this took considerably longer.

So I have installed the known good turbo in the project car and it boosts/drives perfectly. I'm sure you can draw your own conclusions.

Trevor
 
Congratulations! What's happening with the now "turbo less" 90hp donor? Take it you're sending the "overhauled/repaired" turbo back to midlands?
 
TAABVW said:
Yes I have swapped the map sensor. I called it an "inlet pressure sensor" in my original post.

I extracted the refurbished turbo in situ as all the bolts and studs were new since it only went in a couple of weeks ago. I'm quite plodding and methodical and it took me about four hours. I tried the same method with the other extraction but predictably since the turbo had likely been there for 17 years it was a different ball game. I ended up taking the front off and disconnecting the right side engine mount, supported on a chain and swung half the engine out to gain sufficient access to defeat the stubborn nuts and bolts. Needless to say this took considerably longer.

So I have installed the known good turbo in the project car and it boosts/drives perfectly. I'm sure you can draw your own conclusions.

Trevor
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Great result but that's a real let down on the turbo suppliers front
 
Howey said:
Great result but that's a real let down on the turbo suppliers front
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I agree but they can still redeem themselves. We all make mistakes. If they take the turbo back and acknowledge that it was not to OEM spec (as advertised) and resend good turbo in a timely manner then I will eventually have a positive result. However things could go from bad to worse if they try and claim it was a bad install as I am quite meticulous. We could end up with a bit of a Mexican stand off as I will not want the turbo back unaltered.

Trevor
 
It just shows surely that they didn't test the turbo after assembly. As such, how could they have set it up correctly?

RAB
 
If you get a negative response (hopefully not) could it be a potential option to agree to send to a different turbo refurbisher for their opinion?
 
For reference, I think Turbo Dynamics and Turbo Technics are a couple of the very few specialists with a decent reputation

Cheers Spike
 
RAB said:
It just shows surely that they didn't test the turbo after assembly. As such, how could they have set it up correctly?

RAB
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Update.

It turns out that RAB was right. Having sent the turbo back Midland Turbo agree there is no damage of any kind (ie I didn't c**k up the install) and that the turbo was not producing the spec boost. I was a bit annoyed that they said I had altered the settings as that is completely untrue. After all that's why they put tamper paint on the threads so they could see themselves that the settings had not been touched. Nevertheless they are now adjusting it correctly and returning it to me. Hopefully alls well that ends well, but I won't know for sure until I get in the car and drive it.

Trevor
 
Further update to complete this thread. I received the turbo after Midland Turbos second attempt at calibrating the vanes. Fit it back in the car and it was still rubbish with the same lack of low end boost. I reported back to MT on the phone and they said they had done the best they could and could no longer help me. They gave me a full refund.

So I still have a very nice TDI90 with no boost at low revs.

Trevor
 
TAABVW said:
Further update to complete this thread. I received the turbo after Midland Turbos second attempt at calibrating the vanes. Fit it back in the car and it was still rubbish with the same lack of low end boost. I reported back to MT on the phone and they said they had done the best they could and could no longer help me. They gave me a full refund.

So I still have a very nice TDI90 with no boost at low revs.

Trevor
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@Hef another Midland turbo victim.
 
I'm still at a loss to why no one seems to be able to repair these turbo's correctly. I've dealt with four companies since I've owned an A2 and still no joy.
 
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