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kenikh kenikh is offline
3 restos WIP = psycho
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Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,729
Originally Posted by kenikh View Post
Sound slike something may be amiss then...I know that my single turbo application for my turbo was spot on with my Excel plotting, as were the twin turbos I was considering at the time, the Garrett 2056s.

You are clearly not running out of boost or at risk of boost taper, just playing close to the surge line, which is easy enough to manage with an ECU managed boost controller, which would help to shift the line to the right. I'd think that as you've mentioned, this would run fine, it just wouldn't be in the sweet spot of the efficiency islands.

Is this running on your motor now? What boost level are you programming in to run at the various RPMs?
One more observation in looking at the comp maps again, the 2056 twins on my 2.3 look a lot like the GT28s on your motor...they'll work, but aren't ideal. The 2056s really do look like the ticket for you and they'd likely be bolt on as I think they use the same flange.

BTW, are you using the internal wastegate or something on the exhaust like a TiAl?

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 05-17-2010, 02:03 PM
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