[Diy_efi] Seen one, want LOTS more !!

[Grant Beaty]

Crap, I thought you had all the answers ;) I've always wondered about
turbine maps, you can find some charts in Garrett's new catalog,
http://www.turbobygarrett.com/turbobygarrett/jsp/index.jsp I'm not sure how
to read them, but I'm guessing Oolan's links will help.

I've also heard "Turbocharging the Internal Combustion Engine", also out of
print, has great info.

Grant

----- Original Message -----
From: "Greg Hermann" <bearbvd at mindspring.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, January 09, 2003 7:17 PM
Subject: [Diy_efi] Seen one, want LOTS more !!


> Santa wife, who is a librarian the rest of the year, managed to get me a
> copy of the (out of print) Humphries book "Automotive Supercharging and
> Turbocharging Systems" (Motorbooks)
>
> GREAT book, best one I've ever come across on the subject, including
> McInnes and Bell.
>
> Long story short, on page 112 (bottom left) is a TURBINE MAP, credited to
> Garrett and said to be for a TO-25 turbine. Essentially, it consists of
two
> graphs -- one is Turbine Pressure Ratio vs. Turbine Efficiency, the other
> is Turbine Pressure Ratio vs. Corrected Turbine Mass Flow (in lbs./min.).
> In this particular case, because the TO-25 has an integral waste gate,
> there are five lines on each of the two graphs--each line for different
> waste gate positions between 0.0" (closed) and 0.4" (wide open).
>
> The main point is that THIS DATA EXISTS--- SOMEWHERE-- and quite likely
> exists for every possible pairing of turbine wheel trim and exhaust
housing
> (each A/R housing and configuration--on center, tangential, or split--
> should have a different curve, for each and every Garrett turbo !! In the
> case of turbos without integral wastegates, there would only be one line
on
> each graph, BUT THAT'S ALL THAT WOULD BE NEEDED !
>
> My POINT is that THESE turbine curves are ALL of the rest (besides the
> compressor maps) of the info needed (only other number needed is pre
> turbine EGT !!) to do a full quantitative turbo match to an engine, rather
> than doing it "by guess and by golly" !!
>
> SO--does _ANYBODY_ know where to find copies of the rest of these turbine
> maps for Garrett (or any other mfgrs.) ???
>
> Thanks,
>
> Greg
>
>
>
>
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