Isn't it more efficient coasting in gear/engine on?

[Flakbadger]

Originally Posted by euromodder

Sounds like the idle fuel regulator is kicking in to keep the engine running after using DFCO - though around 1500 seems a bit high for it to kick in.

Euromodder thanks for the responses!

That's exactly what I was implying, I think I just worded it badly. I was replying to my older comment, saying my Ultragauge doesn't display DFCO by default, and that my Seat-of-the-pants gauge made it seem like DFCO was happening, which disagreed with the electronics.
Bestclimb explained how to get the Ultragauge to register it, so all is well!

Anyway, it is neat to learn my car does indeed DFCO. And I could be hazy on the exact RPM's :P

[cRiPpLe_rOoStEr]

Coasting on neutral with the engine idling is often quoted to increase fuel-efficiency only in vehicles fitted with carburettor. No wonder those start-stop/automatic engine off-coasting systems are getting trendy in the European market.

[radioranger]

I guess this fits in this discussion, how can i add some adjustable aero braking for when i coast , so i dont overheat or wear out my brakes, ford escort sedan 1998, maybe sone ideas?

[Arragonis]

Originally Posted by cRiPpLe_rOoStEr

Coasting on neutral with the engine idling is often quoted to increase fuel-efficiency only in vehicles fitted with carburettor. No wonder those start-stop/automatic engine off-coasting systems are getting trendy in the European market.

Absolute nonsense - no car is on sale in Europe with a carb - emissions tests here pretty much match the US and are close to Japan.

Start-stop is available on a load of cars here, including some really cheap ones - for FE. Google the Hyundai i10 Blue for the cheapest one.

Start-stop-"cruise" is a new idea punted by VAG. The Prius already does this - Mrs A's turns it's engine off at 90+ if I'm going downhill.

[Mustang Dave]

Originally Posted by radioranger

I guess this fits in this discussion, how can i add some adjustable aero braking for when i coast , so i dont overheat or wear out my brakes, ford escort sedan 1998, maybe sone ideas?

If you're coasting with the engine running, shift into gear and use DFCO. It works with my vehicles. And it gets infinite MPG and causes NO brake wear.

[bestclimb]

Originally Posted by radioranger

I guess this fits in this discussion, how can i add some adjustable aero braking for when i coast , so i dont overheat or wear out my brakes, ford escort sedan 1998, maybe sone ideas?

if you are coasting down you are already putting less strain on the braking system than a normal driving. if you need just a little braking DFCO works great if you need less than that a feather touch on the brakes won't heat or wear them much at all.

[mechman600]

Originally Posted by Arragonis

My old-school SG2 just shows the MPG jump. I don't think you have to tell it about DFCO but its been a while since I read the manual.

I monitor open loop/closed loop on my SG2 at all times. When DFCO is active it shows "OPEN LOOP".

[cRiPpLe_rOoStEr]

Originally Posted by Arragonis

Absolute nonsense - no car is on sale in Europe with a carb - emissions tests here pretty much match the US and are close to Japan.

You misunderstood me. I was pointing that coasting on neutral is often quoted to be effective only in vehicles fitted with carburettor, and the engine off-coasting emerges as an alternative for EFI vehicles.

[Arragonis]

Apologies - maybe I misunderstood but still confused - engine off coasting seems a reasonable idea for carb-fed cars. They won't have DFCO so that would be more efficient in all cases, would it not ?

[serialk11r]

Originally Posted by euromodder

Sounds like the idle fuel regulator is kicking in to keep the engine running after using DFCO - though around 1500 seems a bit high for it to kick in.

1500 is high? My 1ZZ's injectors turn on at 1500rpm... Idle air control starts letting in extra air at about 1000-1200, I never really watched the load gauge carefully enough to see the load jump, but I know it's there. Fully closed throttle at 1500rpm is in the single digits for load, but idle load is like 18-25%.