I have asked my boys on f150online but nobody really even knew this one. Also, there are too many that believe in the EPA. So I figured that more than a hand full of you all have done this before. I remeber reading something about if you delete the egr that you need to have it turned off and something about, so the cpu will not think it is having a lean or rich condition. Is this true, and where could I have this done? Also I have no programmer. My truck is a 97 w/ 4.6.

 

If you delete the egr yes you will have to turn it off or it will trip the engine light. It will trip a code for no egr flow. Deleting the egr will not affect fuel trims. Also just so you know there is no performance increase in this. Since the egr only comes on while cruising and doesn't affect WOT performance.

 

then what does the EGR delete do??? better power during cruising and mpg???

 

It does nothing really. I know some headers will ask you if your using an egr or not when purchasing. Plus it may hurt mpg at cruise in a daily driver. Do to the fact at cruise when the egr is on it circulates exhuast gas back into the cylinders to burn off residual fuel vapor in the exhuast. It cuts back fuel from the injectors a little to compensate. Now if you were making a pure track car there would be no need for the egr system since your not cruising or worried about mpg. Plus it would lose a few pounds from the car not much maybe 3-5 since the egr and tube aren't very heavy. But in a race car every ounce counts.

 

the whole point of an egr delete really is to clean up the motor bay.. it doesnt hurt your performance in most cases so u might as well leave it.

 

That is the wrong explantion of what the EGR does. The EGR puts exhaust gas (dead air) back into the combustion process to lower chamber temps to improve emmissions. It does not burn off excess fuel that is what the cats are there for. It will not hurt your MPG because the fuel trims will not change even when retuned. You will run leaner at cruise which is good and you will get better MPG. There is no performance gain at all from deleteing the EGR, it just looks better.

 

Read this, particularly the last section.

It's a Camaro site but the engineering principles are the same...

 

That true but on a stock mustang tune the advance of timing during EGR is not enough to cause detonation at cruise. On a highly modified engine that flows alot more which would run leaner I can defently see detonation happening like in the camaro world.

 

yes it is basically to clean up your engine bay. If you want you can just take the part off of the plenum and the exhaust and leave the computer stuff alone then it won't trip a code. well atleast mine didn't.

 

I removed mine and I have had no detonation with aggressive timing, 10lbs of boost and in the 440rwhp range. It's a little hard to say from car to car and most importantly tune to tune. If it works, it works, if not, you'll know it quick.