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Old 02-12-2012, 06:31 PM   #126 (permalink)
SentraSE-R
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Join Date: Jun 2009
Location: Bay Area, California
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Mean Green Toaster Machine - '06 Scion xB
Team Toyota
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Starting with a cold engine (~45F), cat sensor 1 reached 550 degrees F in 3 blocks. Cat sensor 2 didn't reach 550F until 7 blocks, at which time sensor 1 was at 800F.

The grill blocks made no difference. EOC after a pulse, and the cat failed to light on the next pulse, grill block or no grill block. Following photo shows cat temp display at the end of yesterday's 10.4 mile P&G drive.


My downhill wasn't long enough. I accelerated to 60 mph at the top of a hill, and went into DFCO at 1100F cat temp. Cat temp rose to 1300F before dropping to 750F at the bottom of the hill, 1.2 miles later. So, unless you're DFCOing 1.5-2 minutes/miles, you can assume your cat stays lit.

Typical cat temps when driving under load.
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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; 02-12-2012 at 06:59 PM..
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