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Old 05-25-2008, 07:51 PM   #1 (permalink)
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Tips: corridor effect question

I tried going 55 on the Mass Pike a few weeks ago. I loved it. It was relaxing and I'm hearing it will increase mileage. But there was no ability to experience the "corridor effect" because people were passing me as though I was crawling. There was no one else going 55. Thoughts anyone?

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Old 05-25-2008, 08:11 PM   #2 (permalink)
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to joycebgood:
Like so many addictions/habits they die hard. "Everyone" has become a fast driver. They all have to get somewhere to do nothing, or drink some beer.
It has been a craziness for too many years. I dont think that high gas prices will turn them around. FYI the latest thing that I have noticed is that the hybrids (drivers) are speeding/driving like crazy. I guess that they think if they get good mileage they can speed.
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Old 05-25-2008, 08:13 PM   #3 (permalink)
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First of all, welcome to ecomodder!

It's hard to say whether the slow down or the corridor effect will improve mileage the most, but if you have a 96+ car I would say to get a scangauge and see for yourself!
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Old 05-25-2008, 08:13 PM   #4 (permalink)
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Originally Posted by njlou View Post
to joycebgood:
Like so many addictions/habits they die hard. "Everyone" has become a fast driver. They all have to get somewhere to do nothing, or drink some beer.
It has been a craziness for too many years. I dont think that high gas prices will turn them around. FYI the latest thing that I have noticed is that the hybrids (drivers) are speeding/driving like crazy. I guess that they think if they get good mileage they can speed.
I think these same hybrid drivers were speeders before they got there hybrids
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Old 05-25-2008, 08:15 PM   #5 (permalink)
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Slowing down will more than make up for the corridor effect. Even though they are blowing by you you still would get a little help especialy if it's a stream of traffic.
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Old 05-25-2008, 10:45 PM   #6 (permalink)
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Now is it true that you can benefit from someone drafting you? Or in our cases tailgating you .. LOL
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Old 05-26-2008, 01:00 AM   #7 (permalink)
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Quote:
Now is it true that you can benefit from someone drafting you? Or in our cases tailgating you .. LOL
I would say no. Also, you have to be extremely close to a very large vehicle to take advantage of drafting. It may increase your FE, but it's very dangerous. Aside from eating all the crap a semi flings up off the road surface (goodbye windshield), you can't see hazards as you approach them. What would happen if the trailer were to suddenly shed a tire?

I'd recommend the 4 second rule as taught in driver's ed. Even as ecomodders, safety should come before economy.
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Old 05-26-2008, 03:25 AM   #8 (permalink)
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Theoretically, two blunt objects sitting tandem in a flow will each see a decrease in drag. The rear object will see a much larger decrease, but the one in front will also see an improvement. It is most likely too negligable to see in real life (nor is it advisable).

Speaking from intuition, I doubt the corridor effect has any major effect on vehicle drag. I could only imagine it being useful in tunnels or maybe alongside massive soundwalls. Drafting on the other hand, while dangerous, is proven.

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Old 05-26-2008, 09:09 AM   #9 (permalink)
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Speaking from intuition, I doubt the corridor effect has any major effect on vehicle drag. I could only imagine it being useful in tunnels or maybe alongside massive soundwalls. Drafting on the other hand, while dangerous, is proven.

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What about situations with stiff x-winds?
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Old 05-26-2008, 11:50 AM   #10 (permalink)
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What about situations with stiff x-winds?
Great question. In 30 mph cross-winds (for the example let's say it's a full, 90-degrees vs. driving direction), if I pass a large vehicle (or vice-versa) the blockage of that crosswind instantly boosts the FE per the SG.

To rule out the noise of the draft effect, during calm winds, the boost isn't as dramatic. In the 'Teg, the x-wind scenario generally boosts FE by roughly 7 MPG, where the "passing draft" gains closer to 3-5. This is generally all of 10-seconds, so you'd have to hang in the "unsafe zone" to take full advantage. On a 3+ lane highway, I often LOD up hills similar to semi trucks. Many build-up momentum to pass in the center or right-center lane and offer up some "help" to climb the hill. I won't make it a habit to maintain side-draft exclusively in the exact same spot. We're each using LOD differently and often lose pace. This doesn't upset the truck driver like full draft does.

For smaller vehicles in a tight corridor formation, this would have to be studied further for solid data.

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