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2007 XC70: What should I know about a turbo-ed engine..?

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vtl
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Post by vtl »

erikv11 wrote: 03 Oct 2024, 13:49 Issues with the turbo itself are extraordinarily rare. Main things are (1) use good oil see vtl's post and (2) be sure to keep on top of PCV maintenance and (3) be prepared to replace the large diameter rubber intercooler hoses about 180k miles when the hoses start turning to mush. Oh and there are several extra vacuum lines, be on the lookout for older, failing, decayed rubber vacuum lines.
And two rubber diaphragms (in compressor bypass valve and wastegate actuator). And pretty much can guarantee, cast iron part of turbo has cracks. I've seen old 3 turbos (around 170-220k), all had cracks.
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erikv11
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Post by erikv11 »

Good point, I remember the days most P80 cars had leaky CBV diaphragms, I suppose we are getting there for the P2 cars now, too.
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 201k
'07 XC70, black, 205k
'07 XC70, willow green, 223k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
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br0dy519
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Post by br0dy519 »

Any info post on the rubber diaphragms? The XC70 has had a vacuum leak for 3 years and it sounds like somewhere near the turbo.
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vtl
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Post by vtl »

br0dy519 wrote: 03 Oct 2024, 19:45 Any info post on the rubber diaphragms? The XC70 has had a vacuum leak for 3 years and it sounds like somewhere near the turbo.
Pull the hoses from TCV and suck/blow air with your mouth, you'll find which one is torn.
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br0dy519
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Post by br0dy519 »

Oh I thought meant some kind of internal seal. You meant the yellow/blue/white tcv hoses
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prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
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abscate
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Post by abscate »

Two turbos, two NAs.

Very little maintenance difference. 5k oil changes, synthetic Castrol

The T5 has the highway boost

The S70 LPT has it all off the line.

The 2 NAs sneer at the turbos as they pass them at the fuel pump, getting > 30 mpg

I can just get to 29 mpg on the T5 if I keep the speed at 55 and no boost
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vtl
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Post by vtl »

abscate wrote: 04 Oct 2024, 03:32 Two turbos, two NAs.

Very little maintenance difference. 5k oil changes, synthetic Castrol

The T5 has the highway boost

The S70 LPT has it all off the line.

The 2 NAs sneer at the turbos as they pass them at the fuel pump, getting > 30 mpg

I can just get to 29 mpg on the T5 if I keep the speed at 55 and no boost
I get 14 MPG in summer. Healthy 1 MPG more than in a pickup truck.
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