[NEWDUCK]

Is the egr opening decreasing drive pressure? What if it opened into the exhaust/atmosphere? Does it open more the more throttle you give it? School me with info please.

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[NEWDUCK]

So in other words with a few machined parts and a down pipe do I have a wastegate by using the egr and its stock programming?

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[xcc_rider]

There was someone on here or another forum that tried the same thing without success.
I think you'll throw some codes and go into limp mode if you keep the components functionable but the ecm doesn't see what it expects to see.
As far as the egr system functionality you'll need to find someone with ecm programming knowledge to determine when it opens and why.

 

[NEWDUCK]

Interesting. So the ecm reads what the egr gasses do after it hits the intake? My plan in simple terms is to build a block off plate that the intake side egr bolts too. This plate will have two ports coming out of it with pipes that will dump out on the drivers side under the engine. If it works eventually route it back into the exhaust pipe.

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[willym]

Remember also that as the EGR valve opens, the intake throttle valve closes some.

 

[xcc_rider]

Yep, its all interconnected.
Im pretty good at process control (not engine but refining) so lets think about the processes involved and what the ecm expects to see.
Egr valve opens-
Decrease in exhaust back pressure
Increase in intake temperature
Increase in intake pressure
TCV closes off to decrease intake pressure and increase "calculated" egr gas flow
EGR cooler servo opens(?) To increase cooling of egr gasses and decrease intake temperature
Turbo vanes adjust for changed boost indication on map sensor
Calculated combustion efficiency changes and adjustments are made to the above to achieve the mapped parameters
And a whole crap load more I don't want to type on my tablet cause it takes way too long.
There's probably a bunch more it sees, calculates or expects to see that I can't even guess at. If it doesn't see it then that's where the cel and limp mode come into play.
There's a post in the powertrain section regarding egr testing with little or no actual flow to the intake and the affect it has on the engine. I'd read it before I put a lot of time into this project.
Good luck with it though. If no one ever tinkered with the systems then we wouldn't have deletes, tuners or sims.

 

[NEWDUCK]

Oh WOW as usual wayyy more into it than I thought. Thanks for the info!. I'll keep digging deeper.

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[jklove]

If egr is enabled in the ecm then it will not be possible. Too many interrelated parameters where actual measured won't measure predicted...especially without functional aftertreatment sensors.

Best option is use a tuner to disable egr & dpf. Then find something to control the valve independently. Best hope for controlling through ECM is if EFI provides user defined table mm3 vs EMP with EGR control values. Again, one would still need the "EGR disabled", but EFI would be sending the control independently. Essentially you need to create a new closed loop control method and bypass the old.

Also, it's better to just use the EBV // EGR Cooler bypass valve, not the EGR valve. This assumes you want to just connect to the flange on the passenger side and remove the actual EGR valve & throttle valves.

 

[Chevokeeman]

Don't have no stinkin' EGR, DPF, exhaust manifold, throttle valve or VGT Turbo, sorry bud, I just had to say it!:rof