My plan for pulse and glide is to get out of gear and flip a switch to kill two of the injectors. We will see how it works...
On Mon, Jun 16, 2008 at 2:31 PM, Aleksandr Milewski <[EMAIL PROTECTED]> wrote: > Right, but this assumes that there is no compression braking in the > engine. You can't do the same coast in gear because you have to turn > the motor/pump air through it. > > Now, if you're braking during that coast to keep your speed down, > you'll get better fuel economy staying in gear and using the engine > for most of that braking. > > -Z > > On Jun 16, 2008, at 10:06 AM, Ken Bogart wrote: > > > Not exactly sure how to calculate it, but if I use some *rough* > > estimates, this is what I come up with: > > > > Assuming 24mpg to maintain 60MPH and 1/2 gal per hour to maintain > > idle. > > > > Drive for 1 hour and you would use 2.5 gallons (no coasting). If you > > can coast for 25% of that in neutral (15 minutes), you would consume 2 > > gallons (1.875 + .125 for idle) (30mpg). If you can do the same coast > > in gear, you would consume 1.875 gallons. (32mpg) > > > > 30MPG is about right for steady 60mph, which is about 2 gallons per > > hour at 60mph. Of course, this "math" all depends on the underlying > > assumptions which are a SWAG. > > > > Ideally, if I could communte downhill both ways, I suspect I could > > attain 50MPG or more... > > > > > > KEN > > > > > > On Mon, Jun 16, 2008 at 12:48 PM, Aleksandr Milewski <[EMAIL PROTECTED] > > > wrote: > >> Bill Cardell wrote: > >>> Does the slowing from the wheels > >>> driving the car (which then has to re-accelerate more than if the > >>> car > >>> coasted) outweigh shutting off the fuel? > >> > >> I have to believe that the losses from running that big air pump from > >> the wheels far outweigh the fuel burned idling. I have a 5 or so mile > >> run on my commute that I can dead-stick. I'll have to play with the > >> trip > >> computer in the Audi. :) > >> > >>> As far as safety aspect, I had > >>> an audi that did this from the factory. 5000TD, if your foot was > >>> completely off the gas it free-wheeled. > >> > >> Automatic or manual? Lots of automatic transmissions have an overrun > >> clutch such that there's no engine braking in top gear. I know the > >> 727 > >> Torqueflite in my old Jeep was that way. And yes, it's very strange. > >> > >> I still get caught out occasionally by the asymmetry of the turbo > >> motor > >> in the A6. Not nearly as much compression braking as there is power > >> under boost. ;) > >> > >> > >> _______________________________________________ > >> Miatapower mailing list > >> [email protected] > >> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > >> > > _______________________________________________ > > Miatapower mailing list > > [email protected] > > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > -- Robert McElwee and Blue Flash "The 40 MPG Miata" www.lightweightmiata.com/mpg Lightweight Miata Forum: www.lightweightmiata.com/forum The Miata Trailer Project: www.lightweightmiata.com/trailer
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