Machines | 0-60 Time Testing - Does The Downhill Grade Matter?
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0-60 Time Testing - Does The Downhill Grade Matter? In my 0-60 time pulls I typically record the acceleration at an on-ramp which has a slight downhill grade. In order to see how much this affects my times, I decided to run a test. Based on this testing, my times are accurate with 4-5%, which is pretty good considering weather, traction, and shift times could easily account for a 5% difference. I'm not aiming to post the worlds most scientific, fastest, and definitive 0-60 times, rather just something that can be used as a ballpark figure for a car's acceleration. I chose to use the 2016 Mitsubishi Outlander SEL S-AWC to run this test for three main reasons. 1. The vehicle has AWD so I do not have to worry about wheel slip interfering with the 60 times. 2. The vehicle is low powered, so the 60 time will be long, allowing for better accuracy in determining a difference in times. This also helps prevent wheel spin. (166 HP I4 Engine) 3. The vehicle has a CVT transmission. This will eliminate any shift time bias that could result from other transmission styles. Effect Of Gravity: Because the vehicle is slow, gravity will have a larger impact on the time than if the vehicle accelerated more quickly. Imagine a car on a downhill slope. You start timing, but don't touch the gas at all. Eventually, the car may roll to 60 mph if the incline is steep enough and air/friction resistance is low enough. Here, gravity accounts for 100% of the 60 time. Now imagine the same scenario, but with a very fast car. It accelerates to 60 mph in 4 seconds. Gravity has played a very small role (as a percentage) for this car to accelerate. Hence, slower cars will have a greater impact than faster cars based on the slope of this on ramp. Related Videos: 0-60 MPH Playlist - https://www.youtube.com/playlist?list=PLwmGb7HbXy1IXEmkpATESIpodNA0NzchH Please feel free to rate, comment, and subscribe! And don't forget to check out my other pages below! Facebook: http://www.facebook.com/engineeringex... Official Website: http://www.howdoesacarwork.com Twitter: http://www.twitter.com/jasonfenske13 Instagram: http://www.instagram.com/engineeringe... Car Throttle: https://www.carthrottle.com/user/engi... To help create more videos, check out my Patreon page! http://www.patreon.com/engineeringexp... NEW VIDEO EVERY WEDNESDAY!
Comments
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I loled at the "Red Ferrari Jacket. +25 HP" bit :)
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Could you do this test with a more powerful vehicle (a car that spin on first gear), i think when the car is on flat, if it spin you need to let go the gas a bit (obviously) but you will loose time from that and the heat transfer to the tire/road. Going downhill on the other hand will most likely prevent that will spin therefore that heat transfer loss and traction issue, im pretty sure going downhill with an auto mustang or something like that you will get you somewhere close to a 10% difference. I hope this make sense to you , tell me if im wrong i would apreciate it , Thanks.
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I like a lot of your videos. I think as long as you aren't trying to say your vehicle does those times for 0-60 it isn't a problem. typically when you do the 0-60 times you are doing a difference because of some change. something I find funny is my 8,000 pound diesel truck with a manual transmission, dyno at 425 engine HP, I am able to do 0-60 in 8.5 seconds. well the one time I tried to find out anyways. I am not sure what it would average at, yet
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5% is not significant, but .4 sec makes a big difference in 0-60 time comparisons
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a 0.4 second difference is a lot honestly. but eh. whatevs
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What grade of inclination did that ramp have?
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could just add 4.5% to all times you give and mention the correction justification in the videos.
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Hi there. How would gradient affect the power and toque calculations of Brad Barnhill's Virtual Dyno software?
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only 166ph from a 2.4L engine?
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"not sure what the speed limit is" ay
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love the rockford fosgate
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When I do a run where I am, I park off side of on ramp (small city // @ night) at bottom where merge is, ensure no traffic on highway (or on ramp obviously), launch. Just so happens there is a nice 1/4 stretch at bottom of on ramp to signage before my off ramp just up behind my house.
Few bumps/not greatest road(s) but it's as scientific as it gets around here, lol... -
Arrrg I hate CVT transmissions, they sound like they are burning the clutch the whole time and it seems like the engine has no torque.
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The problem only arises if that ramp gets changed or you move away you won't be able to recreate the exact same gradient whereas it would be easier to recreate flat ground anywhere. Not that I have a problem with this, I actually find your tests useful and honest.
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I was linked to this video from your "how to launch a manual transmission" video and I am really happy to find out you addressed the effect of a downhill grade. It always bothered me.
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I don't understand why there is no difference, isn't gravity pulling you down that hill??
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looks like the columbia river gorge
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do you have a video explaining CVTs? i remember hearing that they were trying to build a transmission with "an expandable gear" and when the first CVTs came out, i was stumped and could not figure out how its possible. of course my knowledge of transmissions is very small, but still blows my mind regardless
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Funny you happen to be wearing a Ferrari shirt, when they invite people to test at Fiorano the acceleration tests are on a downhill grade.
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So just apply a 5% slope correction to your tests. Realstically things like surface texture, material and temperature make much more difference.