Aidan,
you are getting things confused a little with single and compound setups. Hp and lp turbos are refering to a compound turbo setup, where one turbo is the higher pressure turbo, and another turbo, the low pressure feeds into that. With just one turbo, the hp and lp terms don't really apply, since you have only one feeding the engine at whatever boost you have set. I suppose that makes it the high pressure turbo, but the term doesn't really get used when talking about just one.
Jason
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