6) Choke Line: Overspin Choke Any points plotted to the right of the graph mean the wheel in question is too small and will have to spin too quickly to make the expected boost/power. At these extreme wheel speeds, efficiency goes out the door because the wheel chops the air so badly that the pore density of the charge air will likely cause a dramatic loss of power.
7) Speed Lines: Compressor Wheel Speed This measurement, illustrated as lines across the graph, represents the shaft speed of the wheel. Remember, the faster it spins, the hotter the charge air. This is why they invented intercoolers
The missing pieces of the puzzle here are the engine’s redline speed, the A/R of the turbine side and the volumetric efficiency of the engine. How fast an engine runs will impact the shaft speed of the turbo and when optimal efficiency is realized. The turbine side of the turbo will determine the spool-up characteristics and responsiveness of the unit. Turbine performance and engine redline speed are closely related, and together both of these factors will have a dramatic effect on the efficiency of the compressor wheel.
This entry was posted in Turbo Tech and tagged compressor map on May 17, 2013.
We repair and sell all brands of turbochargers. Our vast knowledge assures you of the best quality and assembly available. All our repaired turbochargers are test run and checked for oil leaks prior to delivery, guaranteeing peace of mind.
Upon Receipt of damaged turbocharger and assessment is done to establish cause of failure and advising client of possible engine damage. The turbocharger is stripped and examined for cause of failure, it is then cleaned and the components bead blasted to ensure that the components are clean and carbon free.
The parts are measured and checked for true and wear and the client is quoted on the repair or replacement of the unit should it be deemed to be uneconomical to be repaired. The client then has the option to have the turbo repaired or to take an exchange unit.