Ford 460 EGR legel unplug, Increases mileage
#46
02-23-2012, 01:36 AM
Wow, when you compress stuff it makes things farther apart?
Good to know, thanks. Learn something every day.
Good to know, thanks. Learn something every day.
#47
02-23-2012, 07:06 AM
#48
02-23-2012, 08:12 AM
But a true race car is not a commuter vehicle so they don't fall into the same category as far as the emissions go. The emission thing is to make the vehicle street legal . You try getting in the emissions pushing 7-800 Hp like in a NASCAR
#50
02-23-2012, 09:13 AM
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Fuel and oxygen molecules (the stuff we burn) is farther apart because now you have exhaust gas mixed in with it, less oxygen molecules per cc so they must be farther apart making them harder to burn
#52
02-23-2012, 10:19 AM
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kjgibson2
"I will NOT admit I am WRONG
I am A highly educated college grad"
#54
02-23-2012, 11:28 AM
We let these people vote, have children, and own guns, too. Scary, isn't it?
#56
02-23-2012, 12:07 PM
Thank you!! I dont see, nor would I want to see, NHRA requiring EGR's on top fuel anytime soon! LOL
#57
02-23-2012, 12:18 PM
You know what i find funny is that your supposed to gain mpg when your egr is open because you know it must be real good on that engine to put dirty exhaust gas into intake air which then ruins a good fuel air mixture then compress it so now your fuel and oxygen are even farther apart because of the inert exhaust gas and so you lose power in that respect, and not to mention all of the exhaust gases you had to use power to compress you get absolutely nothing out of, so basically your saying that by keeping the egr working you allow it to rob power from your engine and that will get better mileage? if you make more power from each combustion event your engine is running more efficiently. keyword being efficiently, maybe its just me but efficiency equals fuel mileage in my book...but hey, if you think it won't help mileage then don't do it, its that simple, it worked for me and it may work for others, if you don't like it, that sucks, if you decide to try it and gain mileage then i'm happy for you.
Efficiency is measured in different ways. Power, fuel mileage or pollutants. When you discuss egr you need to be clear what you are trying to optimize.
Exhaust gases are introduced to lower peak combustion temperatures in order to reduce NOX. But when you put the hammer down the egr valve closes so it makes all your engine's power available. It opens partially depending on load.
At cruise, light load, the egr is partially open.
For every revolution the engine has to take in a certain volume of gas [as opposed to liquid,] and with egr some of the gas is exhaust gas which means a little less of the usual air/fuel mixture. Power output is not affected because demand is low and less fuel is used.
#58
02-23-2012, 12:37 PM
Diesel get large gains with an EGR-block off because they work in a fundamentally different way. Diesels need as much air as they can get to burn efficiently for a given amount of fuel. EGR reduces the amount of oxygen, and reduces Diesel efficiency.
Gasoline engines need a set amount of fuel for a set amount of air going in. Replace the incoming air with exhaust gasses, you need less fuel.
Back in 70s/80s, emissions systems did not have self-diagnostics, so when you ripped off all the emissions equipment, the Carb/EFI assumed it was all still there. As a result during cruise you'd run way lean because it was still fueling under the assumption that part of the incoming air had been displaced with exhaust gas - which would normally require less fuel. So your mileage would go up, but only be cause you were running ridiculously lean.
But with modern EFI systems - including the EEC-IV used on the 87-96 F-Series, it can detect minor faults in the emissions system. If an EGR fault is detected, it will disable the EGR in software, and control fuel/spark as if the EGR was not there. I suppose that could make it feel slightly more responsive and give it a little more part-throttle power.
Gasoline engines need a set amount of fuel for a set amount of air going in. Replace the incoming air with exhaust gasses, you need less fuel.
Back in 70s/80s, emissions systems did not have self-diagnostics, so when you ripped off all the emissions equipment, the Carb/EFI assumed it was all still there. As a result during cruise you'd run way lean because it was still fueling under the assumption that part of the incoming air had been displaced with exhaust gas - which would normally require less fuel. So your mileage would go up, but only be cause you were running ridiculously lean.
But with modern EFI systems - including the EEC-IV used on the 87-96 F-Series, it can detect minor faults in the emissions system. If an EGR fault is detected, it will disable the EGR in software, and control fuel/spark as if the EGR was not there. I suppose that could make it feel slightly more responsive and give it a little more part-throttle power.
