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Old 07-13-2014, 10:32 AM   #156 (permalink)
Baltothewolf
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Join Date: Nov 2013
Location: Apple Valley
Posts: 2,084

Winsight - '00 Honda Insight
90 day: 56.69 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 28.53 mpg (US)
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Quote:
Originally Posted by hackish View Post
One last point about killing the engine when you're rolling, it's a good idea to install an EGT probe in your cat. If you drop below 600 degrees then restart the engine otherwise you'll be a pulse and pollute driver. I did some tester to figure out how badly pulse and glide polluted but unfortunately it would always peg my 5 gas analyzer as soon as the cat dropped below operating temp. Saving fuel is one thing but at the expense of polluting more than 10 cars is another.

This is not as bad on newer cars as they monitor cat temp as you drive and on a restart it goes into relight mode and dumps a ton of extra fuel and pulls timing to light the cat again.

-Michael
Can't that also clog up and ruin your cats as well?
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