This is an interesting topic, I thought of the same thing it should be a very simple solution. Only I think it would react in the same manner as if the EGR valve was just plugged off, a CEL.

The man pressure needs to be at a lower PSI then the air in the Exhaust. This allows the exhaust to displace some of the intake air. If we created a loop as you suggested the pressures would be equal and would have the same effect as blocking off the EGR. I think we still need to understand when the EGR valve opens (pressure wise). The exhaust would seem to be under a higher pressure pre-turbo then the intake since it is the side under restriction, yet this may not be the case. Differing vanes on the intake and exhaust sides could change this some what. It is not so much the speed of each impeller but the pitch of the vanes that do the pressurizing

The sensors, I would think, need to detect a pressure drop within the correct range to not throw a "CEL"

I agree...we definately need to know at what rpms the egr valve is opened and closed at, and if it is pressure sensitive. Once this is known, all that is needed is a bypass that fits the criteria.

__________________
2002 G500 74K
1998 E300 200K and rising
1995 S600 73k


"Some people spend an entire lifetime wondering
if they've made a difference. The Marines don't
have that problem."-Ronald Reagan

"Never tell people how to do things. Tell them
what to do and they will surprise you with their
ingenuity."-General George S. Patton

As stated above, there is no pressure differential, so this wouldn't work. However, if you tap in before the intercooler, the pressure is higher there so it might have a chance of working. But it would be an awfully long run - diagonally across the engine bay.

To answer some questions above, the EGR is most open at part throttle. The engine is boosted (or overboosted in aviation terms) at that time. Not full boost of 1 bar, but maybe 1/3 to 1/2 bar. The exhaust tap is between the exhaust manifold and the turbo, where there is enough pressure to overcome the intake tract pressure.

__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

Correct me if im wrong, but the pressure before the intercooler and after it should be the same. The job of the intercooler is to reduce the temperature of the hot compressed air coming out of the turbo, if it releaved the pressure too, it would undo the work of the turbo and render it pointless to have one in the first place.

__________________
2002 G500 74K
1998 E300 200K and rising
1995 S600 73k


"Some people spend an entire lifetime wondering
if they've made a difference. The Marines don't
have that problem."-Ronald Reagan

"Never tell people how to do things. Tell them
what to do and they will surprise you with their
ingenuity."-General George S. Patton

There is a small pressure drop along with the temperature drop. So it doesn't undo all the work of the turbo, just a little.

__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References