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Old 02-01-2012, 12:10 PM   #52 (permalink)
SentraSE-R
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Join Date: Jun 2009
Location: Bay Area, California
Posts: 1,485

Mean Green Toaster Machine - '06 Scion xB
Team Toyota
90 day: 48.92 mpg (US)
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dcb, read the thread. My kill switch fixed the TCs long ago. Your ECU and TPS tangents ignore the elephant in the room, which is the unlit cat for the previous 800 miles.

I will ask the smog test station about the possibility of a retest, now that I have 900 recent cat-lit miles to clean the cat out. Hopefully they'll do it for less than their full price.

Back to the issue:
I'm reducing my fuel usage to 56% of normal. When the engine is running (let's assume 50% of the time, for a round figure), I'm spewing out 3-15X the average HCs, 3-7X the average NOx, and up to 6X the average CO at a minimum, when the cat is lit. So, if I cut my engine run time and gas usage ~50%, but quintuple my emissions during that time, I'm effectively emitting 2.5 times the pollution of the average car, when my cat is lit.

From my recent history, my cat isn't lit most of the time. If a lit cat is 50% efficient, my emissions through my unlit cat are double what they were during the smog test, when the cat was lit. If a lit cat is 90% efficient, my emissions through my unlit cat are ten times what they were during the smog test. That implies my P&G miles could be emitting 15-75X the average car's hydrocarbons, and 15-35X the average car's NOx!

I'm averaging 176% of the '08 EPA combined estimate. I can probably get 135-140% of EPA with engine on, cat lit, and normal emissions. That's sans P&G, and it's the direction I'm leaning now. Instead of 49.4 mpg, I'll get 39.2 mpg. Instead of using 55.7% of the average xB's fuel, I'll use 71.4%
__________________
Darrell

Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg

Last edited by SentraSE-R; 02-01-2012 at 12:35 PM..
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