Our turbos are so puny, engineered to kick in at a hair past cruising position on the accellerator. When we cruise at 60mph, if we want to slowly pass someone, our turbo spools up right away, increasing air flow throught the MAF, and increasing fuel supply to match. If we installed turbos with slightly bigger turbine sections we would firstly, reduce the amount of backpressure the engine recieves (equals to better off boost fuel economy) secondly, the turbo wouldn't kick in right away, but instead the diesel's torquey nature would be adequate, and at 50% throttle travel, the turbo would start making boost. More eficcient turbo equals to better off boost fuel economy.
I have owned many turbo cars, and most cars have a certain threshold of throttle input before there is enough exhaust energy to spool the turbo, but my tdi is not like that. I have to admit though, that is what makes this engine loads of fun to drive!!
I have owned many turbo cars, and most cars have a certain threshold of throttle input before there is enough exhaust energy to spool the turbo, but my tdi is not like that. I have to admit though, that is what makes this engine loads of fun to drive!!