What does this EGR kit achieve?

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the egr system bleeds hot exhaust gases into the inlet in order to reduce nox emmissions, you dont need them in this country so it can be removed and its generally considered that your engine will thank you for it. Namely because you are not bleeding in horrible exhaust and instead are feeding your engine with lovely fresh air born from daisys and the like.

If your egr sticks open then it can cause you issues.

Reports vary across the interweb, but there are claims of increased mpg etc. I remove egrs on most of my car purely because its less crap in the engine bay. I believe theres some arguments around keep EGT down with the egr, especially if you are towing etc.
 
good point brown,

Getting the EGR off the manifold can be a pig if its decided to seize but just blanking it off in place can be achieved with that kit.
 
Alot of benefits of blanking the egr come from the existing one being shagged, then you blank it off and solve alot of the problems it was causing. With an EGR thats sticking open it can cause all kinds of running issues.

Cause.... effect...
 
Blimey, I've done it and there is a marked difference, I don't have to change down gears on certain hills. I can stay in fourth. She pulls away really nicely from a stand still in second too. All for 15quid. My Landy only has 37000 so she was really clean when I took off the EGR and looked inside.
Next job, better manifold and turbo???? Any ideas gents?
 
Coffeelandy said:
Blimey, I've done it and there is a marked difference, I don't have to change down gears on certain hills. I can stay in fourth. She pulls away really nicely from a stand still in second too. All for 15quid. My Landy only has 37000 so she was really clean when I took off the EGR and looked inside.
Next job, better manifold and turbo???? Any ideas gents?
Click to expand...

Seeing as how EGR does not normally function on acceleration or high power demands the placebo effect is rather marked. :D:D
 
vilguy said:
or if it was slightly faulty is could be restoring it back to normal....
Click to expand...

Maybe. Only real advantage of disabling EGR is that you don't get crap fed back into the engine that it has just got rid of. Should not change performance or reduce fuel consumption to any great extent except in the mind of the driver. Diesels always run with excess air, all EGR does is replace a portion of the excess air with inert gas at various times to reduce Nox output by reducing the combustion temperature.
 
Assuming a homogenous mixing of air in the combustion chamber then the injection of exhaust gases, reduces the quantity of oxygen available for combustion.

This might not be a problem for standard engines etc but when you start trying to squeeze more power out of them then this can have an impact.

If the egr is faulty and staying open fir too long or not closing properly due to a build up of carbon crud etc then this could allow far to much exhaust gases in, affecting combustion.

Ergo.

A normal working egr is fine, but when faulty can cause you problems
 
vilguy said:
Assuming a homogenous mixing of air in the combustion chamber then the injection of exhaust gases, reduces the quantity of oxygen available for combustion.

This might not be a problem for standard engines etc but when you start trying to squeeze more power out of them then this can have an impact.

If the egr is faulty and staying open fir too long or not closing properly due to a build up of carbon crud etc then this could allow far to much exhaust gases in, affecting combustion.

Ergo.

A normal working egr is fine, but when faulty can cause you problems
Click to expand...

Exhaust gas is introduced into the manifold, that is why modern diesels with EGR have a MAF sensor. It's does not control fueling according to air flow like a petrol engine does. But tells the ECU how much exhaust gas is being ingested so that it can be controlled by modulating a control solenoid. Exhaust gas ingested is proportionate to the reduction in air flow through the MAF when the EGR is open.
 
bollocks

MAF is there to tell the ecu how much air is entering the engine in total, not how much exhaust gas is being let in. The ECU can then adjust the fuelling relative to the relative volume of air. Of course the density of the air is affected by temperature etc also, the lower the temp, the denser it is. Hence why intercoolers allow increased power, by increasing the density of the air for a given volume, meaning there is more oxygen to catalyse with the fuel during combustion.

The MAF can be removed on "some" engine / ecu combinations and it goes into a closed loop where it has a bit of a guess as to how much air is in the engine based on presets supplied during its original programming. This is only on some cars though, on others when the maf goes tits up the ecu goes into paranoid mode and just allows you to limp home.

EGR is there to reduce the oxygen content of the air, it actually slows down the reaction inside the cylinder during combustion, reducing the temperature and the MAF has feck all to do with this.
 
vilguy said:
bollocks

MAF is there to tell the ecu how much air is entering the engine in total, not how much exhaust gas is being let in. The ECU can then adjust the fuelling relative to the relative volume of air. Of course the density of the air is affected by temperature etc also, the lower the temp, the denser it is. Hence why intercoolers allow increased power, by increasing the density of the air for a given volume, meaning there is more oxygen to catalyse with the fuel during combustion.

EGR is there to reduce the oxygen content of the air, it actually slows down the reaction inside the cylinder during combustion, reducing the temperature and the MAF has feck all to do with this.
Click to expand...

Diesels are throttled by fuel not by air, MAF has nothing to do with fuel on a diesel. So bollocks back. Until you know what you are talking about don't talk.
 
wammers said:
Diesels are throttled by fuel not by air, MAF has nothing to do with fuel on a diesel. So bollocks back. Until you know what you are talking about don't talk.
Click to expand...

At what point did i say it was throttled by air? The inlet is not throttled in any way. Its open. (hence why if you remove the airbox off a diesel its loud as chuff) MAF has EVERYTHING to do with the amount of fuel injected on a modern diesel.

Fortunately, some of us do know basic engineering, thats why i get paid so much :p

I cant be arsed arguing with you wammers. Ive got a keyfob to break.
 
Time to go all Thor on your ass bitches...

"
Mass flow sensor
From Wikipedia, the free encyclopedia


A mass airflow sensor
A mass (air) flow sensor (MAF) is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine.
The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. (See stoichiometry and ideal gas law.)
There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.
Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.
When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass. Also see MAP sensor.
"
 
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