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Originally Posted by F.I.A.T
compressor maps are a good baseline to start with but altering the motors charateristics will affect your formula. not to mention if we still went solely by compressor maps instead of real world experience we would never be runnning anything larger than a T3 turbo and no where near the GT42R that we run now.
The maps for the Precision turbos are not going to be found. They do their own R&D outside of Garrett and now make some of their own wheels. so simply relying on the garrett mmaps would not be correct in any of your calculations. esspecially since they dont use standard garrett turbine wheels which alter spool and output of each turbo.
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As I had feared with the Precision Turbo's.
Remember, I have designed these calculations to simply be baselines for people interested in the turbocharger selection process. They are a trade off between accuracy and convenience.
By assuming constant values for such things as intake plenum temperature and pressure we are limiting the absolute accuracy of these numbers. However, I have attempted at all times to keep the possible deviation from these numbers below 5%.
If you need any further proof as to the accuracy of these numbers, you can see that on the sea level adjusted tables, the estimated hp output coincides with AJP's dyno runs to within
1%. For any estimation those are phenomenal results.
The only thing preventing these numbers from being more accurate is lack of information. Perhaps instead of pointing out possible sources of error you could assist me by providing more accurate data.