It seems everybody is going WOT
The trend from the major car makers seems to be a variable valve timing and volume, with no more need for a throttle butterfly:
Toyota Announces New Intake Valve Lift and Timing System. https://bioage.typepad.com/photos/unc...valvematic.png Excerpt: Quote:
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It certainly makes sense, having variable intake lift and timing would allow the engine to be alot more efficient across a large rpm range. BMW has a similar system. I analyze product failures for a living and systems like this always make me wonder what happens when the system fails. Could you end up with a virtual wide open throttle, or is there a fail safe system that at least shuts down the engine?
It reminds me of something I really wouldn't want in a car, the Mercedes 500 SEL has a drive by wire brake system. Yikes. I don't know about you, but I like the idea that when I push my foot on the pedal that I'm actually increasing hydraulic pressure directly and not relying on a CAN based computer system directing a pump. |
This is equivalent to what is in the r18, innit?
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Think so, just like BMW too.
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The r18 has a throttle body butter fly. Its integrated into the control system with there tricky dicky ivtec. With attention paid to pumping loss, coupled with a variable length intake manifold.
Heres a Honda vid. https://world.honda.com/HDTV/news/2005-4050705a/ psy |
Ya, I have NO love for drive-by-wire braking.
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I like the theory, but the mechanics would seem prohibitively complicated (apparently I'm wrong if they are pursuing the technology)
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It's complicated because the problems (FE and emisisons) are complicated problems to solve. This is an attempt to address the requirements for a consumer product.
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Chevy did something else: Displacement on Demand, or Active Fuel Management™. Probably ain't too many of these on the board. Problem is, they're putting the technology in the huge V8s and some V6s. I wonder if they'll be applying the technology to a 4-banger.
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I didn't really have the time to research if there were any problems or what happens if the system fails. m |
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