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Old 12-19-2022, 09:48 PM #106
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I can assure you that if you were to turn a cold engine with a turbo at max engine rpm with an electric drive to keep the "exhaust" air cold vs the same engine running normally and monitored boost pressure, it would be no contest as to which would produce more boost!
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Old 12-20-2022, 02:09 PM #107
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Quote:
Originally Posted by Myrunr2010 View Post
Iíd love to see some data on how much efficiency/energy is gained from that. In principle that makes sense though.

Curious how the temperature on the compressor side is disconnected from the turbine side? Just because the connection between the two sides isnít that bulky and heat soak isnít that bad?

How does Subaru handle oil return on the low-mounts?
The calculation is non-trivial for the energy available lost/gained since the exhaust isn't a closed system... But we can get an idea:
Hold pressure, n (mass), R (constant) all the same. Drop the temp by 100*C (180*F) from 1520F/825C/1100K to 1340F/725C/1000K. For PV=nRT, that means the volume of the air drops by 1000/1100 to 91% of the previous volume.
Hold volume constant, same calculation - absolute pressure drops to 91% of what it used to be. If you are working in pressure ratio with say 14.7psi into the turbine and atmospheric out (pressure ratio of 2), then you'll drop to 13.4psi in to a pressure ratio of 1.91 - you just lost ~5% of your available energy to extract from the exhaust... So, not huge - but it is FREE energy you are wasting. Then you just have to compare that to the packaging and other hassles and make your decision.

For heat across the turbo - There's multiple reasons. Yes, there is the physical disconnection. If the center section got as hot as the exhaust, the shaft bearings would just coke up and stop the turbo - so you *know* that it isn't as hot as the exhaust... So, already you aren't at 1400*F - you are more like 200-300*F (also below coolant boiling, if water cooled) then, the air flowing through the compressor doesn't actually have time to absorb heat from the compressor. It is there for a tiny fraction of a second. All the heat put into the air through the compressor comes from the ideal gas law + the compressor efficiency (or, inefficiency).
Turbocharger Compressor Calculations


Subaru puts a little sump below the turbo to catch the extra oil after shutdown:

Also note the vent line that runs to the PCV system to keep the turbo sump from pressurizing while running.

Hope that helps.

-Charlie
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Old 02-20-2024, 07:16 AM #108
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What a nice project. I also wanted to do something similar but is very hard to find the parts and I ended up in the middle.
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Old 02-20-2024, 07:36 AM #109
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I did a turbo build on my old Honda Civic because I wanted it to be stronger for towing stuff. It was a big project that took a lot of effort, learning, and searching for the right parts like the turbo itself, some coolers, and pipes to make it all fit and work well together.

During my build, I found the best deals on turbo kits by comparing prices and reviews online, ultimately settling on a GT35 turbo kit which cost me around $1200. It took me a few weekends and some evenings after work to get it all put together. Doing it myself was cool because I learned a lot about how my car works and what it can do.
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Last edited by CookieRoe; 02-23-2024 at 04:24 PM.
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