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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,273
"would it be a possible to build an hybrid turbo using the hot side of the K27-7006 coupled to the cold side of the K27-7200 ? Are the parts compatible ? Is it mechanically possible ? Would it be possible to get this described turbo from a turbo tuner or spécialist ? Additionnal question, would it be possible to get a titanium turbine wheel in order to reduce the inertia ?"

The answers to all the questions before the last one is yes.
The compressor wheel is a heat treated aluminum alloy so I don't know if titanium would be lighter and have less inertia.
Also while the 7006 compressor wheel exducer is smaller than the 7200, the inducer appears to be the same 52mm diameter, they have 2.75" compressor housing inlets and I don't know if the pitch or angle and depth of the turbine blades may be different between the two?

I'm not an expert and none of the usual posters I've seen here is a turbo expert even though there are self appointed experts.
I do have some experience with the K27 HFS and the K27 7006 and have researched them somewhat because of my experiences with one HFS...

The HFS uses a stock K27 7200 turbine wheel and housing, the same K27 bearing housing, same backplate with the shaft hole drilled bigger, but it has a larger 61mm Holset compressor wheel and an unmarked 3K compressor housing with a 3" inlet that fits the Holset wheel size and contours correctly.

I would suggest calling or emailing a professional turbo rebuilder and asking them your questions to get accurate answers.
If you don't mind a long distance call the best turbo rebuilder in the USA is Durabilt
You don't have to believe me though so call or email the top USA race teams and ask them who they use... Over here it's Durabilt, http://www.durabilt-turbo.com/
I'm sure there are places in Europe just as good and on the average better because 3K Borg Warner won't sell parts to just anybody in Europe, they only sell parts to certified turbo rebuiders.... while over here Borg Warner will sell parts to anybody regardless of their ability that will buy a certain dollar amount of parts.

As far as the increased backpressure of the HFS over the 7006, maybe a bigger wastegate or 2 smaller wastegates would take care of that problem.

Here's a pic of a UMW K27 HFS and a K27 7006 side by side to show the difference in size of the turbine wheels and housings and the compressor wheels and housings.
The HFS is on the left in these pics.



From everything I've heard and read a ball bearing Garret GT35R totally blows away anything made by KKK, the newer 3K Borg Warner units, or any hybrid using 3K and Holset parts.
Old 01-01-2010, 10:52 AM
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