On Jun 12, 2005, at 11:15 AM, John Slade wrote:

 >The stock turbine housing is just plain too small for aircraft use.  
I'm not entirely sure that's true. Perhaps not totally ideal, but it can work, and it's a lot easier / cheaper to install.  I'm now running the stock '89 turbo modified to look like a T04-V1 (I think) by http://www.turbonetics.com.au/ and balanced to 120k rpm.
It seems to be behaving quite well so far. 48MAP at Sea level = enough of power to turn my big 84 pitch prop at 4070. 46MAP at 10,000' - no problem - prop rpm 6100 and 235 kts TAS.
John
 

Well John, you are the one flying a turbo rotary and I still fly behind pistons. so you must be right! Nothing like real world experience. If I recall you fly a Cozy? How many hours do you have on the turbo now John?

My 13B experience is auto only, but the bigger turbo just breathes so much better even as low as 3000 RPM, I really think the little stock hitachi turbo is choking the engine. That is why I think the stock turbine is just too small. You can pick up a cast iron t04 flanged manifold on ebay for $150. A fancy stainless tubular unit with fancy coatings is about $700.

Hans