i'm buying a predator chip and i read how you can use it to tell your computer to shut off the EGR system. i was just wondering if somebody would be able to tell me if that would be a good idea because i dont want to do that if all it does is cut off the air without shutting off the spark advance as well. does this feature shut off the entire EGR system in general or just cut off the exhaust air from going into the intake manifold?
if the tuner can infact do that, then what it does is make it possible so that the pcm will not turn on the evr which controls vacuum to the egr solenoid. there is no real advantage to disabling the egr on a street driven car.
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well i guess the idea is that if you take away the recirculating exhaust that is dumped into the intake to make it more emissions friendly or whatever, that it makes more room for clean air and raw fuel.. which in theory, gives more power? i dont know. i guess it makes sense if thats what it does but does it do that though and would it be bad on the car?
i'm buying a predator chip and i read how you can use it to tell your computer to shut off the EGR system. i was just wondering if somebody would be able to tell me if that would be a good idea because i dont want to do that if all it does is cut off the air without shutting off the spark advance as well. does this feature shut off the entire EGR system in general or just cut off the exhaust air from going into the intake manifold?
I removed my EGR from my 98GT. It was "turned off" in the tune and with my hand held SCT tuner.
A dyno tune with chip will turn off most any emmissions issues.
well i guess the idea is that if you take away the recirculating exhaust that is dumped into the intake to make it more emissions friendly or whatever, that it makes more room for clean air and raw fuel.. which in theory, gives more power? i dont know. i guess it makes sense if thats what it does but does it do that though and would it be bad on the car?
It doesn't create more power. Heat creates power.
Anyways, the people that disable it on a street car (myself included) do it to get rid of that annoying bucking problem that is associated with EGR valves that tend to stick, or the solenoid acts up.
i think its safe to say, just to be more accurate, that combustion creates power. warm air coming into your intake creates less (exhaust air) power. so by removing dirty, hot air from your exhaust, it would cause your car to suck more clean air (which would also cause your car to add more fuel... to create hotter combustion... more power.) simple enough i suppose. but my question was in regards to the spark advance... not the purpose. anyways let me know what you think.
i think its safe to say, just to be more accurate, that combustion creates power. warm air coming into your intake creates less (exhaust air) power. so by removing dirty, hot air from your exhaust, it would cause your car to suck more clean air (which would also cause your car to add more fuel... to create hotter combustion... more power.) .
obviously not simple enough, as it taht's not exactly how an EGR system works.
well actually i hate to argue and thats not what im trying to do. but thats exactly what an EGR system is. it recirculates spent exhaust into your combustion chamber to burn it again to make the car more emissions friendly. here is a link explaining it so you can understand a little better before you reply. http://www.allpar.com/mopar/emissions.html
it even states my whole arguement....
"EGR reduces emissions and may increase gas mileage slightly; some vehicles shut off EGR during wide-open throttle in order to avoid having it interfere with power...."
"EGR puts a portion of the exhaust gas back into the intake manifold, so it mixes with the fuel and air. (Note that the exhaust adds to the fuel and air; it doesn’t replace any of it). The added mass in the cylinder is harder to heat up, so the combustion events have lower peak temperatures. The lower temperatures prevent the O2 and N2 from splitting and combining. Even though the exhaust is hot, about 600°C (or 1112°F), it's much cooler than the 1300°C required to make NOx."
K so again... back to the original question....
oh and it says, like i did, EGR takes away power due to lower temperatures in the combustion chamber... which is a result of raw fuel and air not being used but rather exhaust gases.
so again... back to the original question...
no, you stated that "clean air" and "fuel" are dumped in.
They are not. I do know how an EGR works, i do design them afterall
Combustion temps are higher at part throttle than at WOT, an EGR is designed to mix exhaust gases that create a chemical reaction with the fuel mixture to create low NoX levels. Overall peak temps are lower, which helps prevent part throttle detonation. Part throttle timing is higher, combined with leaner A/F mixtures (designed this way for fuel mileage reasons), and the EGR is designed to keep detonation from happening. It can be removed, and is by most, because of that bucking problem i described.
Timing and spark advance is not altered by the EEC when the EGR is disabled.
where did i state that clean air and fuel are dumped in by your EGR? im pretty sure i said that more clean air and raw fuel are consumed due to the exhaust gases being removed from the combustion equation by disabling the EGR though. unless i worded it differently or something i dont know.. anyways... first though, an EGR's purpose is not to prevent detonation.. thats what your O2 sensors are for.. they adjust air and fuel so you have the proper combination of the two so your mix isn't too rich or too lean(which causes detonation.) you don't get detonation by adding more fuel and air, because the percentage of the mixture is controlled by your sensors. and its safe to say also that more air with more fuel... equals more power, because you have a cleaner hotter burning combustion process. correct? so logically speaking, if you have a combustion process that is including dirty exhaust, it is taking up space that would otherwise be occupied by what? more clean air.. and more fuel.. because that space has to be occupied by something and mechanically speaking it will come straight from your air intake, passing your MAF(which will detect more air and add fuel to compensate) and cause a better combustion process to occur in the chambers... causing more power! the whole thing i am trying to state and point out. by shutting off your EGR it does add power and does not cause detonation because this is not 1967 the world of carburated cars and fuel systems, thus your computer will compensate for more clean air on its own. my question was in regards to the timing of the computer factor of the EGR not the mechanics on how an EGR works.
however, you were correct that one product of having the EGR functioning is that you do get better gas mileage.. but we all own 8 cylinder mustangs... not too concerned about another 1 mpg if it means a small increase in mid range and top end power
anyways... first though, an EGR's purpose is not to prevent detonation.. thats what your O2 sensors are for.. they adjust air and fuel so you have the proper combination of the two so your mix isn't too rich or too lean(which causes detonation.) you don't get detonation by adding more fuel and air, because the percentage of the mixture is controlled by your sensors.
not really.. heat can as well if there is too much.. but the small amount cause by more burning fuel is not enough to cause detonation like you stated. the sole purpose of the EGR system is to create less emissionsn not prevent detonation of your engine
not really.. heat can as well if there is too much.. but the small amount cause by more burning fuel is not enough to cause detonation like you stated. the sole purpose of the EGR system is to create less emissionsn not prevent detonation of your engine
the sole purpose of the EGR is NOT for emissions. It was created YEARS AGO for both emissions and the detonation, however in these days, there are many tricks we have up our sleeves to control emissions, that in the near future you won't be seeing EGR valves on engines. In fact, about half of GM's upcoming engines won't have them.
Disabling EGR system 
