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I am following the turbo saga as well, and have been getting things in
order to select the right turbo for our project as well. I am going to
send mail off to Max (or call him tonight <his morning>) to
determine some more parameters regarding the rebuilt turbo he sent John
Slade. But, I will ask here as well in case someone has the info I am
looking for.
I understand that Slade's rebuilt turbo has a compressor that is
similar to a T04 V trim, but what I haven't been able to find is what
the turbine side is equivalent to. Also, with regards to the turbine
side, the information in general is quite scarce. I understand that you
have T03 and T04 turbines out there, as well as T03 turbines mated to
T04 compressors (Hybrids). My understanding is that the smaller (T03)
turbines are lighter and spool faster, and when mated with a smaller
compressor (also a T03 variety) that the pressures peak higher at lower
RPM (good for off the line/acceleration).... whereas a hybrid (T03
turbine mated to a larger T04 compressor) develops the peak pressures
at a higher RPM and generates more flow for a given pressure.
If that understanding is incorrect or in error, please point out what
needs revising.
What I have yet to find is a good explanation of T03 Turbine "stages".
The T03/hybrid turbo's listed for sale all have stage numbers (stage
1,2,3, etc) associated with them and I haven't quite figured out the
difference (other than the overly simplistic/vague explanation that
higher stages are for higher hp). Being a "why" kind of guy, I would
like to be able to assimilate this properly.
Watching, Waiting, Ebaying..
Dave Staten
DaveLeonard wrote:
Great overlay John.
For some reason you plots seem to put this
more in the surge region than with the data that I was using. I don't
know what the difference is. Anyway, based on your initial conditions
I decided that maybe going a little smaller (moving the overlay to the
right) would be OK. And what do you know, I have been following a
turbo on e-bay with a compressor between the v-trim and p-trim
(slightly smaller) and I may just get it for $335. And it has a nice
way to attach the exhaust - unlike that lame TO4 I bought from someone
on this list that has no way to attach the exhaust(slip fit turbo's are
everywhere and they suck - anyone want to buy one?) :)
Dave Leonard
That's better Dave
I don't know Excel all that well, but I tried
to make a few additions.
I added a graph overlayed on the compressor
map, then generated some plots by iterative data entry.
There must be a way to generate the source
data and plot it based on a table of MAP and altitude.
This would help get closer to knowing what
settings keeps us on the "island".
Does this make any sense, or am I off on a
wild goose chase?
Hmmm. A wild goose at 15000 ft while at 46
MAP and 6500 rpm. I wonder where that would go on the chart :)
Regards,
John
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