turbo Surge and Choke meanings
In: Technology
“turbo surge” is you quickly letting off of the throttle say when you look down and your running 65 MPH in a 40 and you see a state trooper sitting up the road running LIDAR. it’s the sound of the waste gate on the cold side of the turbo opening up to allow the pressure to drop down. A choke allows more fuel to enter a combustion chamber than air to start a cold gasoline engine.
source, I own 2 diesel trucks and love the sound of my turbo’s waste gates opening.
A turbocharger being choked means that the resistance from the valves rises just as quickly as the turbocharger can increase its pressure. Basically, once you reach choke-condition with a turbo, engine power will no longer increase with higher RPM, torque will trop off and eventually the turbo will run fast and hot enough to destroy itself.
If by Turbo Choke you mean exhaust brake, then it’s quite simple. When activated, an exhaust brake valve (a valve installed after the turbo) closes, introducing a great restriction to the exhaust flow. The area for exhaust to escape is much smaller, which restricts how much power the engine makes. When going downhill, an exhaust brake keeps the engine at a specific RPM. A truck going downhill in neutral will continue to accelerate, even with an engine brake on. A truck going downhill in the correct gear will slow down with an engine brake on because the brake keeps the drivetrain from running away due to gravity or momentum.
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