991.2 Thoughts on turbo longevity and repair costs?
10-04-2015, 04:04 PM
#1
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991.2 Thoughts on turbo longevity and repair costs?
They used to talk about turbo motors needing time to cool after spirited drives. My indy has always told me it is more expensive and complicated to fix things. Also I don't often hear of turbocharged motors going hundreds of thousands of miles without repair issues. Thoughts?
Jim
Jim
10-04-2015, 04:42 PM
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Cool down:
More for the air cooled days of the 930, 964 and 993. Not so much for the now 991. Unless your neighborhood is at the end of a race track, this is a non issue.
More expensive to repair/maintain:
May a little for some projects due to plumbing and shielding that needs to removed for access. Like plug change for example.
Longevity and multi 100,000 miles:
There are many high mileage air cooled and 996 turbos here on Rennlist. Bottom line, most all Porsches are toys and 3rd cars for most owners. Few NA cars see high mileage. I'm sure a 991 Turbo will go well over 200,000 miles with good, proper, proactive maintenance.
More for the air cooled days of the 930, 964 and 993. Not so much for the now 991. Unless your neighborhood is at the end of a race track, this is a non issue.
More expensive to repair/maintain:
May a little for some projects due to plumbing and shielding that needs to removed for access. Like plug change for example.
Longevity and multi 100,000 miles:
There are many high mileage air cooled and 996 turbos here on Rennlist. Bottom line, most all Porsches are toys and 3rd cars for most owners. Few NA cars see high mileage. I'm sure a 991 Turbo will go well over 200,000 miles with good, proper, proactive maintenance.
10-04-2015, 05:03 PM
#3
Cool down:
More for the air cooled days of the 930, 964 and 993. Not so much for the now 991. Unless your neighborhood is at the end of a race track, this is a non issue.
More expensive to repair/maintain:
May a little for some projects due to plumbing and shielding that needs to removed for access. Like plug change for example.
Longevity and multi 100,000 miles:
There are many high mileage air cooled and 996 turbos here on Rennlist. Bottom line, most all Porsches are toys and 3rd cars for most owners. Few NA cars see high mileage. I'm sure a 991 Turbo will go well over 200,000 miles with good, proper, proactive maintenance.
More for the air cooled days of the 930, 964 and 993. Not so much for the now 991. Unless your neighborhood is at the end of a race track, this is a non issue.
More expensive to repair/maintain:
May a little for some projects due to plumbing and shielding that needs to removed for access. Like plug change for example.
Longevity and multi 100,000 miles:
There are many high mileage air cooled and 996 turbos here on Rennlist. Bottom line, most all Porsches are toys and 3rd cars for most owners. Few NA cars see high mileage. I'm sure a 991 Turbo will go well over 200,000 miles with good, proper, proactive maintenance.
10-04-2015, 05:06 PM
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10-04-2015, 05:14 PM
#5
Guess it wasn't obvious to those who know. The Mezger can handle much more abuse than its DFI counterpart. The 996 turbos were tuned to very high reliable power ratings. It's a lot more reliable to date than its DFI counterpart.
Time will tell, but I wouldn't make statements about the DFI turbos longevity for a while.
Time will tell, but I wouldn't make statements about the DFI turbos longevity for a while.
10-04-2015, 05:41 PM
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10-04-2015, 06:08 PM
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10-04-2015, 06:43 PM
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10-04-2015, 06:51 PM
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I have had turbos in my commercial diesel trucks for over twenty years. Turbos run on their bearings at well over 20,000 rpm and when you turn off the engine they are still spinning, except once the key goes off so does the oil pressure. So, what you want to do in any turbo engine is let it idle down before shutoff so there is oil to the bearings. You want that spin to be 1,000 rpm when you key off, not 25,000 rpm. That's what kills most turbos and most people don't know that. You don't want to come off from a high sped run on the highway into a gas station quickly and shut off the engine immediately, let it idle down for a few. Ideally 3 minutes (Recommended on all my Cummings diesel engines) as the spin can go a long time and you want oil feed to the bearing - but no one is going to do that....however longer you can go at idle before engine shut down the better. The other key is to always keep good, clean oil in the engine.
10-04-2015, 07:19 PM
#12
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I have had turbos in my commercial diesel trucks for over twenty years. Turbos run on their bearings at well over 20,000 rpm and when you turn off the engine they are still spinning, except once the key goes off so does the oil pressure. So, what you want to do in any turbo engine is let it idle down before shutoff so there is oil to the bearings. You want that spin to be 1,000 rpm when you key off, not 25,000 rpm. That's what kills most turbos and most people don't know that. You don't want to come off from a high sped run on the highway into a gas station quickly and shut off the engine immediately, let it idle down for a few. Ideally 3 minutes (Recommended on all my Cummings diesel engines) as the spin can go a long time and you want oil feed to the bearing - but no one is going to do that....however longer you can go at idle before engine shut down the better. The other key is to always keep good, clean oil in the engine.
J
10-04-2015, 10:34 PM
#14
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Unfortunately without written proof I can't be 100% certain.
10-04-2015, 10:50 PM
#15
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