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The way I understood Shiv's post is that "at the same altitude", say 10000 feet, it is WRONG to use the same correction factor on differently sized turbos. Leaving PSI the same, between a larger and a smaller turbo, correction factors will be different. Correction factor on a smaller turbo that's not as efficient will be larger at higher altitude than for a larger turbo that's more efficient. This is why correction factors aren't portable across different turbo setups, especially at different barometric pressures...how does that sound?
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