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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old August 4th, 2017, 19:33   #16
WrEkkED
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Xman sells a 1756. I originally bought this turbo then changed my mind and went bigger. But its good to 210 bhp. May be a good option. Sopposedly does not get turbo creep like the 17/22 and has lower emp's as well, but flows mucj better and spools quickly.
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Old August 5th, 2017, 00:51   #17
mk1-83
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Thats because he upgrade turbine wheel .
And you can make large wheels in a small frame turbo this make things bad.
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Old August 25th, 2017, 10:34   #18
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Thanks for the suggestion wrekked. I will inquire about that option as well.
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Old August 28th, 2017, 22:14   #19
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Depending upon the desired use, not all large compressor wheels in small frame turbos are a bad thing: I live at 4600 feet elevation and the air here is quite thin; even a standard vnt-17 wouldn't like being pushed at 24 PSI (corrected) all day long when needed. My 56mm comp wheel in my vnt-15 compressor housing provides boost just off of idle and solidly without surge to redline. My Stage 4 tune is more of a Custom Stage 3+ tune producing somewhere around 160 HP and that is all the power I really want as I am not interested in breaking parts on a regular basis. Had my HP goals been somewhere in the 200 HP range, then the turbo I have would have been the wrong one for the application. Sometime long ago, Charlie commented that a 17/56 using a vnt-15 cold side could be a great turbo, but I am sure his comment was application specific as well.
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Old September 6th, 2017, 13:56   #20
turbovan+tdi
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Running the same 17/56 as above at sea level, no surge, runs great!
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Old September 6th, 2017, 22:07   #21
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I have not yet had the opportunity to take my Jetta down to sea level for a couple of days to see what she will do with a 24 PSI hot tune and all the fuel she will take. I will imagine at sea level she will likely spool even faster than she does now, and I don't quite know how that can be possible but I am sure ready to find out.

EDIT: the 17/22 (17/52) that originally came on the VW Transporters was known for surge issues simply due to the design of the snail and compressor wheel. It was for a work truck and the boost island wasn't really compatible for high performance applications. A vnt-17 with a 52 mm compressor wheel upgrade is an entirely different beast and is not prone to surge as I believe the A/R is a lot smaller than the A/R of a standard 17/22.
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