Compound turbo setups??

[THE_Liam]

Be warned - there is some actual sciency shit behind all this, I keep meaning to do a post on Pressure Ratio with regards to Compounding etc..

Just wanging two turbos you found together will probably result in things being pretty counter productive a lot of the time...

Don't think of turbos spooling turbos... You have to think of it in terms of the engine increasing in exhaust gas flow, the turbos are basically seperate entities.

The general idea is high pressure turbo (small) feeding into the inlet, low pressure/atmosphere (big) turbo going straight in the inlet of the HP turbo... Then the exhaust side is generally exhaust manifold straight into the HP turbo, then outlet of the HP turbo into the LP turbo... But usually the HP turbo will require to have a significantly uprated wastegate - remember you're going to be using the LP turbos massive airflow - the HP turbos wastegate probably won't cope and you'll end up overspeeding it... Then out the LP turbo into the exhaust.