AAA tests show 5-7% city mileage gain with automatic engine stop-start

[Cobb]

For those without a hybrid that has start/stop it would be interesting to know if the engine goes right into auto stop from dfcu(SP?) or does it burn a little gas before making that transition when coming to a stop.

I think that method makes an even bigger deal for mpg.

[jamesqf]

With the 1st gen Insight, you can usually get it to go into autostop at speeds below about 18 mph. And if you're on a downhill and are fairly careful, you can sometimes get it to stay in autostop up to 40 mph or faster.

[cRiPpLe_rOoStEr]

Originally Posted by Cobb

For those without a hybrid that has start/stop it would be interesting to know if the engine goes right into auto stop from dfcu(SP?) or does it burn a little gas before making that transition when coming to a stop.

I think that method makes an even bigger deal for mpg.

In an Audi A3 that I have noticed the start-stop working, it did burn a little gas before stopping.

[oldtamiyaphile]

Originally Posted by Cobb

For those without a hybrid that has start/stop it would be interesting to know if the engine goes right into auto stop from dfcu(SP?) or does it burn a little gas before making that transition when coming to a stop.

I think that method makes an even bigger deal for mpg.

For 'safety' the engine won't stop unless the car is stationary. It will also restart if you exceed 5mph with the engine off (eg rolling down hill). UFI will DFCO down to idle so depending on the gear you're in it will use a little fuel in the transition. There's maybe 3 seconds of idle fuel used there.

I plan on installing a kill switch so I can EOC up to a stop, and have the car auto-restart when the light changes (mainly because S/S won't work with anything but the stock Pb battery, and I've got supercaps ready to go in). On the other hand, S/S on a turbo car still doesn't sit with me quite right.

[Frank Lee]

Originally Posted by oil pan 4

People over on that gas gasbuddy forum were I do a lot of recruiting say auto stop-start is "a stupid idea" and "wont save any fuel" and some how "the car will use more fuel by restarting it".

Lot of idiots out there.

Trust me auto stop-start is nothing new, cars sold in japan have had it since the 1990s.
Finely time we got to get a little 1990s technology in some of these new vehicles.

Only time I visit gasbuddy anymore is when I'm feeling masochistic. The idiocy on the forums/comment sections there is way more than knee-deep; a guy could drown in it.

My '59 has "start-stop" on it right now- the idle screw has backed out and it stalls when I approach a stop. :P

[markweatherill]

Start / stop is just so anti-consumerist!

[jamesqf]

Originally Posted by Frank Lee

My '59 has "start-stop" on it right now- the idle screw has backed out and it stalls when I approach a stop. :P

Yeah, I've had a vehicle or two like that. Yet another reason to love carburetors :-)

[Frank Lee]

Gave 'er a little crank- it's all good.

[oil pan 4]

Stop-start is theft from the state you capitalist pigs.

[cRiPpLe_rOoStEr]

Originally Posted by oil pan 4

Stop-start is theft from the state you capitalist pigs.

As we say in Brazil, ladrão que rouba ladrão tem cem anos de perdão (a thief who robs from another one has a hundred years of forgiveness)