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Guest Message by DevFuse

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Coasting downhill

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7 replies to this topic

#1 David Peters

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Posted 17 November 2004 - 07:37 PM

Have my first Subaru. 2005 Forester. When coasting down hill by my home my former car, Toyota Camry, would increase speed by 10 mph by time I got to bottom. My Forester only increases about 3 mph in same distance and at same starting speed. Is this due to AWD system, or is it possible brakes are draging or something like that ?

#2 Suzam


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Posted 17 November 2004 - 08:12 PM

Is it broken in yet? New vehicles are "tight" mechanically until they get a few thousand miles on them. That's why you need to break in a new engine. Transmission, drivetrain and brakes, when new, could all create a "drag" on momentum.

#3 Kaptain Kouta

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Posted 18 November 2004 - 06:50 AM

Don't forget there's a fair weight difference between a Camry (erghhhh....cardigan car.....) and a Forester, so gravity could have something to do with it.
Is your Forester MT or AT? The different shift points etc in the 2 cars may also contribute. I have found that my 02 AT OBW "holds" 3rd or 4th coasting downhill a long time before the torque converter locks up and the car coasts "free".

#4 friendly_jacek


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Posted 18 November 2004 - 09:19 AM

different aerodinamics may play a role but I bet (if the cars are AT) different setting in tranny computers affect how effective engine braking you see in diffrent cars. Also, bigger engine may contribute a greater braking too. In summary, who knows?

#5 cookie


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Posted 18 November 2004 - 12:47 PM

and you are rolling a four wheel drive system. Huge difference in coasting with my tiny BMW roadster and my Forrester. To be expected.

#6 Strakes


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Posted 18 November 2004 - 02:21 PM

The forestor has the aerodynamics of a brick or a school bus (tall and square like old Volvos)...I bet that has something to do with it. Plus a little bit can be attributed to the AWD.

#7 mtsmiths


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Posted 18 November 2004 - 02:24 PM

Parisitic drag doesn't really come into play until you're over sixty or so. So, on the interstate you may feel aerodrag, going down deadman's hill in your local neighborhood, not.

#8 coloradosubarules



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Posted 19 November 2004 - 12:44 AM

Have you checked the underside to see if you have hit anyone and their lifeless body is slowing you down.

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