Quote:
Originally Posted by joshoisasleep
As far as going smaller... is it a question of amount of boost power, or will it spool up later with the bigger one?
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A smaller turbo will make boost at lower rpm and can also produce higher maximum boost. However with a 3B you won't be using the maximum boost your turbo can produce anway.
A bigger turbo will provide a little more power at high rpm for the same amount of boost.
The process of mapping a turbo is simply checking the engines airflow requirements are within the capabilities of the compressor and making sure the turbine is the right size to make boost when you want it.
Junkyard turbos can be a perfect match, even if the original manufacturer didn't design things that way.