Quote:
Originally Posted by aerohead
I'm not much of an engine guy.On my Honda, air temp is thermostatically controlled at about 100 F and fed to the carb.
On an EFI engine,if you were going to do this I'd think you'd want it upstream of the mass airflow sensor,or else the computer couldn't properly control the injectors.
But horsepower for horsepower,the engine would need the same mass of air,and you'd still be stuck with the inlet restriction of the barely-cracked throttle plate.
Mitsubishi and Toyota have GDI engines which are throttle-less,just like a Diesel,with 15% higher thermal efficiency because they're always at WOT.
I've heard of gasoline engines with dual throttles,one for low speed,then transitioning to the secondary for higher power settings.I've never seen one,but it sounds like a good compromise.  |
Copy all.
Since my RAM is a MAP reading vehicle, I pull warm air through the radiator near the hot water inlet, and duct it into the air box. Couldn't tell you how much throttle blade angle difference it makes, but it does make the tranny downshift earlier. PCM is intake air temp sensitive; a real drag when climbing hills.
My 1984 Jetta had a two blade throttle; the smaller opened at low power settings and linkage made the second open after the first one was wide open... At that time people were complaining of the on-off feel of mono-throttle blades.
