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Old 02-11-2012, 07:48 PM   #119 (permalink)
SentraSE-R's Avatar
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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Originally Posted by California98Civic View Post
I wonder how often the CAT would be "lit" if you started from cold, running until it is lit, and then did your hypermiling for the remained of the 10+ mile course you describe. Once it is lit, it would more easily be maintained at higher temps by the short pulses in a P&G routine.
I'll find out tomorrow. I suspect there will be no difference, since my 25-40 mph 4th gear P:G ratio is ~ 1:3, and my 18-32 mph 3rd gear P:G ratio is 1:5. My guess is the cat will cool below its light-up temperature with 3-5 times to cool after every pulse.

I also plan a long DFCO test tomorrow to see if I can determine how long it takes to drop the cat from its normal 1100F to below light-up temp.

Rooster, yes, my radiator cooling fan kicks on at 204F, and I get nervous with the grill completely blocked. The fan doesn't do much good when it can't pull air through the radiator. I've wired an indicator light with the fan relay's NO circuit, to give me a visual signal that the fan is on. I'd driven home Thursday and yesterday through Needles and Barstow in the desert, and removed the grill blocks then.

Mech, resident and out-of-staters can bring federal-compliant cars into CA if they bought them OOS.

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; 02-11-2012 at 07:54 PM..
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