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D5 205 boost problem

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Old Jul 21st, 2019, 21:21   #1
wagonwheels
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Default D5 205 boost problem

I've been chasing a performance issue for 6 months or so with my 2010 xc70 d5 205.It has a definite flat spot from 2600rpm to 3000rpm.There are no codes on vida and boost looks ok from what I can see.I did replace my bottom intercooler hose as it had a tiny pin hole in it and smoke tested the intake side of things with no obvious leaks detected.I did the smoke test as I feel it hisses too much under full throttle at lower rpms .
It's also fairly poor on fuel (28-30mpg) and compared to my 2004 xc70 d5 163(shark remap,egr delete, stainless exhaust and intercooler) it feel weak especially low on torque.
I wonder if being the twin turbo set up that one of the plastic joining feed pipes might have split on the turbos but I cant find any info on it being an issue.
Any info greatly recieved.

Stuart
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Old Jul 24th, 2019, 06:12   #2
GrahamBrown1
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Have you checked either of the turbos?
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Old Jul 25th, 2019, 10:43   #3
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I've now physically checked the spindles for play now as they are extremely difficult to get to either.It makes boost but not as quick as it should according to Vida.I suspect the black plastic pipework connecting the two turbos is to blame but again you cant see.
I had an xc60 205 which blew the small turbo at 44k and the bill was massive to sort .I was hoping not to be that unlucky twice.
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Old Aug 3rd, 2019, 08:01   #4
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Quote:
Originally Posted by wagonwheels View Post
I've now physically checked the spindles for play now as they are extremely difficult to get to either.It makes boost but not as quick as it should according to Vida.I suspect the black plastic pipework connecting the two turbos is to blame but again you cant see.
I had an xc60 205 which blew the small turbo at 44k and the bill was massive to sort .I was hoping not to be that unlucky twice.
But you did a smoke test, so if there was no leak, why do you think it is the black plastic pipework ?
Dave
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Old Aug 4th, 2019, 22:44   #5
wagonwheels
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The smoke test wasnt to the same pressure as actual boost pressure and it only happens under peak boost.Ive checked all the other hoses and replaces any that I had any doubt over but I cant look down the back of the turbo set up and there is oil mist deposits down the back where the turbos are.I can live with the noise to be honest but the drop in power at 2500-2800rpm is annoying.
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Old Aug 5th, 2019, 20:36   #6
GrahamBrown1
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Originally Posted by wagonwheels View Post
The smoke test wasnt to the same pressure as actual boost pressure and it only happens under peak boost.Ive checked all the other hoses and replaces any that I had any doubt over but I cant look down the back of the turbo set up and there is oil mist deposits down the back where the turbos are.I can live with the noise to be honest but the drop in power at 2500-2800rpm is annoying.
The twin turbo d5s are known for eating the odd turbo as you have previously found.
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Old Aug 5th, 2019, 21:15   #7
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Hi you need to do a smoke test at high pressure , near the turbo pressure,
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Old Aug 5th, 2019, 21:57   #8
wagonwheels
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I'll be really annoyed if it's another set of turbos. Looking at Vida the actual vs specified boost is ok and makes good pressure but does drop from specified at 2500-2800rpm .Just odd theres no fault code.
I'll need to try to get the pipework between the turbos checked at high pressure and check the small turbo(its the only one I can get to).
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