Accent coasts poorly, but why? - Fuelly Forums

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Old 03-16-2009, 10:55 AM   #1
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Accent coasts poorly, but why?

My 2008 Hyundai Accent coasts much more poorly in neutral (it's a manual) than any other car I've owned. I was hoping it would improve after being broken in, but it persists. I live in a mountainous area, so I coast in neutral a lot and sometimes for quite extended periods (I live right on a big ridge). I asked my mechanic but he had no real suggestions as to why the coasting performance is so poor. Anyone have any ideas? I doubt it's something I can do much about, but a man can dream... Thanks.

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Old 03-16-2009, 11:07 AM   #2
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How about jacking up each wheel and spinning it- to check if any of the brakes are dragging.

You could try to make a belly pan to improve aero- is that rear bumper cover hollow underneath? If so, it could create a parachute effect if it is scooping up air all of the time.
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Old 03-16-2009, 11:10 AM   #3
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Excellent practical suggestions! The rear bumper is indeed hollow and partially exposed to form somewhat of a scoop. Maybe some sheet metal to cover that up? But how to attach it. Have to think.

Need to wait on warmer weather to spin each wheel. Still a ton of snow here in VT!

I know my snow tires coast worse than my all-weathers, but even accounting for that it still coasts badly.
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Main Entry: co de pen dence - see codependency
co de pen den cy
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Function: noun
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: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin) ; broadly : dependence on the needs of or control by another
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Old 03-16-2009, 12:56 PM   #4
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the tire pressure is at its max, right?
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Old 03-16-2009, 02:01 PM   #5
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Yes, they are. My snow tires only have a max of 35, but the all weathers I run in the summer are more than that (the value escapes me at the moment). My previous vehicle (a Honda Accord) coasted significantly better even with winter tires inflated only to 32 psi. And it was a 1990 with 150,000 miles! Rust killed it in the end.
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Main Entry: co de pen dence - see codependency
co de pen den cy
Pronunciation: \kō-di-ˈpen-dən(t)-sē\
Function: noun
Date: 1979

: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin) ; broadly : dependence on the needs of or control by another
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Old 03-16-2009, 03:18 PM   #6
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Google tells me the aerodynamic drag coefficient for that car is a respectable .31, so that's probably not the problem. At 2500 pounds it shouldn't be too light to coast reasonably with that drag coefficient.

Check the wheels for free spinning as mentioned above, not only looking for dragging brakes but also a bad wheel bearing.

Maybe there's lots of friction in the drivetrain? Thick fluid in the transmission and differential, or badly designed CV joints? That would seem to be a stretch.
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Old 03-16-2009, 04:11 PM   #7
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I have been trying to figure out in general why the Accent's mpg is only 32. That's worse than the Aveo and the Yaris. I notice that the automatic transmission Accent is actually rated higher than the manual one for highway driving.
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Main Entry: co de pen dence - see codependency
co de pen den cy
Pronunciation: \kō-di-ˈpen-dən(t)-sē\
Function: noun
Date: 1979

: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin) ; broadly : dependence on the needs of or control by another
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Old 03-16-2009, 04:28 PM   #8
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Use the lightest weight gear lube recommended.

regards
gary
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Old 03-16-2009, 06:20 PM   #9
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Quote:
Originally Posted by R.I.D.E. View Post
Use the lightest weight gear lube recommended.
Well that's cheap and easy to try. Cool.
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Main Entry: co de pen dence - see codependency
co de pen den cy
Pronunciation: \kō-di-ˈpen-dən(t)-sē\
Function: noun
Date: 1979

: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin) ; broadly : dependence on the needs of or control by another
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Old 03-16-2009, 08:20 PM   #10
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Have a look at the handbrake (emergency brake) adjustment as well.
Sometimes they can not release fully and cause a significant amount of drag.
Easiest way is to put your finger on the hub or as close as you can get to it and feel if it is at all hot after a long coast.

Good luck , Pete.
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