EGR system - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 15 (permalink) Old 02-03-2008, 06:29 PM Thread Starter
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EGR system

Just pulled the egr valve out for the first time and it was soked and covered in soot(got pics if any one wants to see but i will need to figure out how to post them)...i have herd that means a bad egr cooler so how do you delete the whole system completly?

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post #2 of 15 (permalink) Old 02-03-2008, 08:14 PM
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To completely get rid of it take off the manifold cut off the ports and weld them shut then take off your up-pipe and weld it shut.

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post #3 of 15 (permalink) Old 02-03-2008, 08:35 PM Thread Starter
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ok...i am only 17...so what is involved in doing the whole delete...my dad has been welding for 35 years so i have that part covered
thanks

'03 F250 XL 6.0LK&N intake, mbrp 5" stacks, SCT X3 with tunes from innovative, 6" superlift, 315-75r-16,boost, pyro, fuel pressure, oil pressure gauges all in the a-pillar,h-11 studs, short throw shifter,fass 95/150 with complete custom fuel lines, south bend clutch, traction bars
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post #4 of 15 (permalink) Old 02-03-2008, 11:47 PM Thread Starter
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Does anyone have pics of which ports to cut off of the manifold? thanks in advance

'03 F250 XL 6.0LK&N intake, mbrp 5" stacks, SCT X3 with tunes from innovative, 6" superlift, 315-75r-16,boost, pyro, fuel pressure, oil pressure gauges all in the a-pillar,h-11 studs, short throw shifter,fass 95/150 with complete custom fuel lines, south bend clutch, traction bars
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post #5 of 15 (permalink) Old 02-03-2008, 11:47 PM
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Quote:
Originally Posted by brentos
To completely get rid of it take off the manifold cut off the ports and weld them shut then take off your up-pipe and weld it shut.
WOAH!

That only deals with the exhaust portion, you will still have coolant flowing thru the system, and if you REMOVE the EGr cooler, you need a way to get the coolant from the oil cooler outlet to the intake and back to the front cover.

I should also point out that removing or disabeling the EGR system can actually CAUSE headgasket faulires. Yup, cause it, not prevent it.

EGR does two very important things, and these are often overlooked when tuning.

1) It absorbs the temperature spike from the initial combustion process, in this way EGR helps keep the PEAK cylinder temperatures down. In fact, it is temperatures aver about 2000*F that cause the formation of NOx, which is the reason for EGR to begin with.

2) It dilutes the air in the cylinder, and this slows the combustion process so you get more uniform cylinder PRESSURES.

Deleting EGR can and will cause spikes in both combustion temperature and pressure, which can ultimately lead to failures.

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post #6 of 15 (permalink) Old 02-04-2008, 12:16 AM Thread Starter
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Ok speaking of the oil cooler i have heard that the oil cooler is crap to and should be replaced with an external air cooled one is it worth it and then how much harder would it be to pipe the coolant back to where it needs to go? thanks

'03 F250 XL 6.0LK&N intake, mbrp 5" stacks, SCT X3 with tunes from innovative, 6" superlift, 315-75r-16,boost, pyro, fuel pressure, oil pressure gauges all in the a-pillar,h-11 studs, short throw shifter,fass 95/150 with complete custom fuel lines, south bend clutch, traction bars
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post #7 of 15 (permalink) Old 02-04-2008, 12:54 AM
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You effective cannot "replace" the stock oil cooler. By removing it you open the oil and cooling systems with nothing to put in the place of the stock cooler.

The stock cooler is far from junk, but they do get clogged if you get contaminated coolant or debris in it. This is not because the cooler is defective or poorly engineered, but because the cooling system has stuff in it that should not be there (incorrect coolant, debris etc).

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I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

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post #8 of 15 (permalink) Old 02-04-2008, 01:06 AM Thread Starter
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Do you now of anyone that has done a complete delete of the egr system?

'03 F250 XL 6.0LK&N intake, mbrp 5" stacks, SCT X3 with tunes from innovative, 6" superlift, 315-75r-16,boost, pyro, fuel pressure, oil pressure gauges all in the a-pillar,h-11 studs, short throw shifter,fass 95/150 with complete custom fuel lines, south bend clutch, traction bars
Singles #118
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post #9 of 15 (permalink) Old 02-04-2008, 01:38 AM
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Yes, a few members of TDG have. You gotta be REALLY careful with the tuning though, or the cylinder pressures will get you.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

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post #10 of 15 (permalink) Old 02-04-2008, 01:02 PM
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[2) It dilutes the air in the cylinder, and this slows the combustion process so you get more uniform cylinder PRESSURES.]

I was unaware of this fact. Since egr is on at cruising speeds, which the engine is used at the most, this makes sense in the long run. However, at wide open throttle, egr is shut off, would'nt the cylinder pressures/spikes be the highest?

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