Deceleration
November 24th, 2015, 04:27 PM
#1
Deceleration
This may be a silly question, but I was wondering what determines the deceleration rate of a car? We've all had cars that "feel" differently with your foot off the gas at velocity and I am not sure if it has to do with the gears or something else and wanted to get educated if possible.
My 442 and Jeep Wrangler for example, decelerate much quicker than some previous Cutlasses and modern cars I've owned. Just wasn't sure if it is specific to each vehicle, or if manufactures can dictate this and dial them in accordingly?
Thanks!
My 442 and Jeep Wrangler for example, decelerate much quicker than some previous Cutlasses and modern cars I've owned. Just wasn't sure if it is specific to each vehicle, or if manufactures can dictate this and dial them in accordingly?
Thanks!
November 24th, 2015, 04:29 PM
#2
gear ratio is a big factor. a 411 gear will decelrate faster than a 2.56 due to the engine brake effect. Much like a manual trans an engine will decelrate faster in 1st gear than say 3rd gear.
November 24th, 2015, 05:37 PM
#3
Registered User
Join Date: Aug 2013
Location: Evansville, IN
Posts: 10,944
Mainly gearing, like said above. Tire size, smaller would be slowing down faster, and displacement of the engine, bigger will slow you down more. Clutch or lockup TC vs non locking TC. Drag of the vehicle. How wide the tires are.
November 24th, 2015, 05:43 PM
#4
Registered User
Join Date: Sep 2013
Posts: 3,607
On a side note i was told not to decelerate to quickly with a gear of 456 /488 as can do damage!True i don't know just what i heard from a fellow racer. I have never used those gears.
Last edited by wr1970; November 25th, 2015 at 07:23 AM.
November 25th, 2015, 06:49 AM
#5
Connoisseur d'Junque
Join Date: Sep 2010
Location: The Hudson Valley
Posts: 21,183
Three factors:
• Displacement
• Compression ratio
• Gearing
Displacement and CR determine the resistance of the engine to turning with a closed throttle, and gear ratio determines the amount of that resistance applied to the rear wheels over a given interval.
Obviously, how tightly connected the wheels are to the engine will matter as well, so a fluid-coupled transmission will pass less force through than a friction clutch.
- Eric
• Displacement
• Compression ratio
• Gearing
Displacement and CR determine the resistance of the engine to turning with a closed throttle, and gear ratio determines the amount of that resistance applied to the rear wheels over a given interval.
Obviously, how tightly connected the wheels are to the engine will matter as well, so a fluid-coupled transmission will pass less force through than a friction clutch.
- Eric
November 25th, 2015, 07:27 AM
#7
Registered User
Join Date: May 2009
Location: Woodland WA
Posts: 1,009
November 25th, 2015, 08:10 AM
#8
Registered User
Join Date: Aug 2013
Location: Evansville, IN
Posts: 10,944
Three factors:
• Displacement
• Compression ratio
• Gearing
Displacement and CR determine the resistance of the engine to turning with a closed throttle, and gear ratio determines the amount of that resistance applied to the rear wheels over a given interval.
Obviously, how tightly connected the wheels are to the engine will matter as well, so a fluid-coupled transmission will pass less force through than a friction clutch.
- Eric
• Displacement
• Compression ratio
• Gearing
Displacement and CR determine the resistance of the engine to turning with a closed throttle, and gear ratio determines the amount of that resistance applied to the rear wheels over a given interval.
Obviously, how tightly connected the wheels are to the engine will matter as well, so a fluid-coupled transmission will pass less force through than a friction clutch.
- Eric
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