Quote:
Originally Posted by Phoenix'97
I will conduct more research but I will save this image for reference. If Toyota has found optimal A/F ratios for varying driving conditions and throttle positions, then it should be good enough to tune my LT1 for! Thank you all for your comments and helping to expand the possibilities with my motor!
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Interesting, I have had 7 Priuses, the oxygen sensors are not wideband, so they don't have a way to run lean, and this on a car that is "all out" for good fuel consumption!
Thinking about this, from first principals, the highest efficiency happens with the highest possible temperature peak from a given amount of fuel. The improvement in consumption with lean burn comes from reduces manifold vacuum, so with the Atkinson cycle best fuel consumption may not be with lean burn!
I actually like Mazda's solution to Atkinson: their "Miller cycle" runs similar inlet timing to the prius in aktinson mode, but then a turbo to make up the lost charge in the late inlet cycle by running positive manifold pressure at high power output. no valve timing control needed, can do it on an old car with DOHC quite easily.