Quote:
Originally Posted by Robert
Most compound units I've played with have one large blowing into one small or a turbo blowing into a roots blower.
|
I once had some thougths about this and I reversed it in the end so that a roots blower would deliver the mass of air to the engine.
Roots blowers take power from the crank witch is not so good for mecanical efficensy so using a turbo as the second step would take the load off the roots as delta P would decrease and once the tubo working on full boost it would not be litle load and loss on the roots. Was a idea I newer had time to folow trough and I doubt it would be worth the effort.
For this Jag project I'm wondering how small the HP turbo can be. I want boost as quick as posible and would like to pick some turbos that flow just enough to supply the required air for the engine and thet the LP turbine deliver the performance increasement.
How would I pick matching turbos? Would be interested in some theory here.
I have the formulas to calculate the heat and boost in sutc a system, but not how to pick the turbos.
Would I use a HP turbo that is at the edge of it's flow capasety and a LP turbo that is delivering the same flow at this given situation or???