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Join Date: Nov 2010
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K27 "motorsport / 935" question

Thinking of changing my K27/7200 out for my 935 turbo which I believe is the "motorsport" turbo with the "999" designation (see attached image).

Best I can gather from reading some old posts, is the motorsport turbo may be better for top end and will have a longer spool time / softer mid-range. If this is the case, I am going to stay with my 7200 as I would much perfer keeping my mid-range. Any ideas on whether this is this case?
Old 07-24-2017, 08:05 AM
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3 restos WIP = psycho
 
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Join Date: Feb 2005
Location: North of Exit 17
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999 K27 are a very mixed bag. Pretty much impossible to know what to expect without measurements.

First thing to observe: what size hot side housing? 9, 11, other?

What's the diameter of the turbine?

What are the critical measures of the compressor wheel?

What kind of compressor housing is it? K27 (usually 2") or K29 (usually 2.5").

From all of these, one can triangulate expected boost onset (normalized to your displacement and compression ratio), as well as discern top end potential.

Back to 999 turbos. I've seen every configuration under the sun. There's no reliable way to discern what you have just from part numbers, as these turbos were usually monkeyed with from day one, to accommodate specific track needs.

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Old 07-24-2017, 11:06 AM
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Great info. What if the unit were "stock" and never opened up? Would the stock characteristics of the turbo be along the lines of the softer mid and more top end? Thanks
Old 07-27-2017, 07:29 AM
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3 restos WIP = psycho
 
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Hard to know. 999 turbos may be well documented at the factory, but those on the outside aren't privy.

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- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 07-27-2017, 10:32 AM
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