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re: I’m skeptical that auto stop / start on automobiles is a great feature for saving fuel
Posted on 8/12/18 at 9:47 pm to klrstix
Posted on 8/12/18 at 9:47 pm to klrstix
quote:That's most likely due to a lack of oil throughout the whole engine though.
I have always read that 90% of your engine wear happens in the 1st 30 seconds of starting your car
If it shuts off for a short time after running, I imagine there's still a good bit of oil remaining in the engine.
0
Posted on 8/12/18 at 9:49 pm to klrstix
quote:
I have always read that 90% of your engine wear happens in the 1st 30 seconds of starting your car
That's because on a cold start, all of the oil is in the oil pan instead of coating the walls of the cylinders, the pistons, and the valve train and you have metal on metal wear until the oil pump can circulate the oil back through the engine. The claim with the start/stop is that the oil doesn't have enough time to drip back down into the oil pan when you're stopped two minutes at a red light and there's still sufficient oil coating when the engine starts back up to prevent the metal on metal wear.
It's a fricking PITA joke, one way or the other.
ETA: Goddammit, bhtigerfan.
This post was edited on 8/12/18 at 9:59 pm
Posted on 8/12/18 at 9:58 pm to weagle99
If you really want to save fuel then use the cruise control all the time. If you don’t use it now you’ll get 10-15% increase in mpg.
Posted on 8/12/18 at 11:10 pm to lsu xman
quote:
I think in some model cars, the a/c will not blow cold air after a short amount of time. That pisses off some drivers.
Rented a Chrysler Pacifica two weeks ago and it did exactly this. It was particularly annoying in traffic right after you got into the car and it hadn't had a chance to properly cool down yet.
Otherwise, it was a nice ride.
Posted on 8/13/18 at 1:16 am to weagle99
My opinion is that this was done to inflate mpg ratings for a given vehicle
Posted on 8/13/18 at 9:16 am to lsu13lsu
quote:
If you really want to save fuel then use the cruise control all the time. If you don’t use it now you’ll get 10-15% increase in mpg.
Let me jump in on this point... I drive a 16 Explorer and have a 13 mile one way commute to work which is about 60 % interstate type of driving... I can easily maintain 22.3 MPG overall... when relying heavily on cruise control verses about 20.5 mpg when driving without it...
Posted on 8/13/18 at 10:46 am to weagle99
I've read that an engine idling for ~8sec uses about the same gas as starting the engine so if you're stopped for more than 8 seconds you'll save gas.
Posted on 8/13/18 at 10:52 am to klrstix
quote:
Let me jump in on this point... I drive a 16 Explorer and have a 13 mile one way commute to work which is about 60 % interstate type of driving... I can easily maintain 22.3 MPG overall... when relying heavily on cruise control verses about 20.5 mpg when driving without it...
Yep. The only thing that will make it better is if everyone was using cruise control. It sucks when you get that person that cuts in front of you and you have to brake. Driverless cars cannot get here quick enough.
It will be crazy when Driverless cars get here and we immediately need 10-15% less fuel for cars.
Posted on 8/13/18 at 10:53 am to CoonassatTEXAS
quote:I have an AMG that does this which makes absolutely no sense because if you buy an AMG you’re not doing it to save on gas or cut emissions. I can turn the feature off but I still can’t imagine any drivers of that car wanting that function.
My 18 f150 had this and it annoyed the shite out of me. Luckily you can buy an attachment to hook the truck up to your laptop and reprogram the auto stop off as default.
Only reason I still have the truck. Lol
Posted on 8/13/18 at 11:16 am to shotcaller1
It helps the EPA number and MPG, which helps the CAFE number:
Automakers get incentives to do it this way from the Environmental Protection Agency. If the vehicle’s stop/start system is nonlatching and automatically turns on whenever you start the car, the EPA’s fuel-economy test results will be calculated only when the system is engaged. But if a vehicle’s stop/start system can be permanently turned off, then the vehicle’s fuel economy is tested both when stop/start is active and when it’s off. The EPA then averages the two tests for a resulting fuel-economy rating found on the car’s window sticker—which is certain to be lower.
Since stop/start is estimated to boost fuel economy by 4 to 5 percent using the EPA test cycle, according to Buick, obviously it has a positive effect on the fuel-economy rating. Carmakers who have nonlatching stop/start systems also qualify for additional “off cycle” emissions credits from the EPA, and those can be applied to meet their overall targets for Corporate Average Fuel Economy standards.
From Car & Driver
Automakers get incentives to do it this way from the Environmental Protection Agency. If the vehicle’s stop/start system is nonlatching and automatically turns on whenever you start the car, the EPA’s fuel-economy test results will be calculated only when the system is engaged. But if a vehicle’s stop/start system can be permanently turned off, then the vehicle’s fuel economy is tested both when stop/start is active and when it’s off. The EPA then averages the two tests for a resulting fuel-economy rating found on the car’s window sticker—which is certain to be lower.
Since stop/start is estimated to boost fuel economy by 4 to 5 percent using the EPA test cycle, according to Buick, obviously it has a positive effect on the fuel-economy rating. Carmakers who have nonlatching stop/start systems also qualify for additional “off cycle” emissions credits from the EPA, and those can be applied to meet their overall targets for Corporate Average Fuel Economy standards.
From Car & Driver
Posted on 8/13/18 at 11:24 am to VetteGuy
Why won’t our brilliant government put half as much effort into improving traffic flow and developing ‘smart’ highways?
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