Pulse and glide should be called Pulse & Pollute

[Phantom]

I want to see the raw data.

[robchalmers]

Personally i think if you are causing the pollutants to increase by killing then re starting the engine the answer is simple - don't turn off the engine!!

by drop from 2750rpm under load to an idle of 800rpm unloaded will still VASTLY reduce fuel used and gassed produced.

[dcb]

I thought p&g was engine on or off
EOC was engine off coasting.

but consulting the glossary, they are both engine off, i.e. CODFISH

http://ecomodder.com/forum/showthrea...e-ii-3505.html

[cfg83]

hackish -

I have worried about the same thing. On the chance that your data confirms your hypothesis, that is one reason I converted my non-heated 02 sensor to a heated version :

http://ecomodder.com/forum/showthrea...2-a-10921.html

But like everyone else says, the VX lean-burn mode is a special case, and we need to see the data. A comma-delimited output in the "code" editing wrapper would help a lot for independent analysis.

CarloSW2

[Thymeclock]

Originally Posted by dcb

I thought p&g was engine on or off
EOC was engine off coasting.

but consulting the glossary, they are both engine off, i.e. CODFISH

http://ecomodder.com/forum/showthrea...e-ii-3505.html

I was under the impression that P&G would even apply to automatic transmissions, i.e. when you take your foot off the gas and coast (whether in drive or in neutral). Actually the practice is more like accelerate and coast but it fits under the broader idea of pulse and glide, just not to the same degree.

If that's the case, then we would need a separate term for coasting. Maybe we should scrap the term P&G and substitute differentiating terms of engine-on coasting vs. engine-off coasting.

Personally, I don't see any substantial FE achieved by shutting the engine off for very brief periods. More numerous restarts do shorten starter life, simply from increased use & wear but that doesn't seem to be of concern those whose only criterion is hypermiling, not economy of total $$$ in operating costs. Situations like shutting the engine off at a long red light are the exception; they probably save whatever fuel would have been expended during extended idling. But that strategy does not involve coasting.

[dcb]

for purposes of this discussion, what's the diff between eoc and dfco? aside from clutch-in/neutral vs in gear?

[bestclimb]

so about 1/3 of a tank for me is spent with the injectors off either DFCO or EOffC/pulse and EOff glide.

in 8 months I have not burned 120 gallons by hypermiling including above techniques. without them my gasses by ppm may be worse, but so much worse that they are not covered by not burning 120 gallons?

[dcb]

you can buy a lot of starter rebuilds for 120 gallons in gas

[bestclimb]

Originally Posted by dcb

you can buy a lot of starter rebuilds for 120 gallons in gas

400 and something dollars worth according to the fuel log, however I have been driving this civic like this for the last 8 months with who knows how many miles on the current starter and it has yet to give any indication that the starter is in poor shape.

[orange4boy]

I have been EOCing and P+Ging a lot lately with my better batteries. My starter started to stop working so I was worried about a rebuild but it turned out to be that the solenoid was worn off one on side of the contact plate. After 300,000 K I'm not surprised. Brushes were fine and windings perfect. I spaced out the plate with a washer to expose unworn material and now it's good for another 300,000. I love my Toyotas.

I suspect the restart pollution is being caused by the cat temps dropping.

What about the Prius and the like? It has a lot of "eoc" time but still qualifies as an ULEV (or whatever) and no insulated cat. Perhaps the issue with your VX is software related.

I have heard that insulating the cat is a very bad idea. They can overheat and melt down. Perhaps shielding it from the airstream is enough but not too much. Another advantage of belly pans?

My glides are usually a 1/4 mile or much more so I doubt I'm worse off although I will look at a shield for the cat soon. Must be better than just the stock one which would be designed for worst case scenario over-heat.