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GDE Tune with SEGR?  RSS feed
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dgeist
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Joined: 21/07/2009 10:57:32
Messages: 9
Location: Atlanta, GA
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So, I know there are some folks out there running a system called the "Synthetic EGR" that keeps the EGR valve closed on their CRDs and reports back valid signal levels to the ECU to avoid error codes and automatic detune behavior. I know that the GDE tune (mostly) has the same effect on the behavior of the EGR, but if someone wants to leave the SEGR in place (such as if they think their EGR is probably dead and caked over with soot by now...) what is the impact/interaction with the GDE tune?

Thanks.
Dan
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GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 372
Location: Southeast Michigan
Dan,

Continuing to run the SEGR won't have any negative impacts. With the GDE calibration, the only time the EGR opens is in a maneuver with potential surging of the turbo compressor so the SEGR will keep this function from happening.

In all honesty, the only time you really and truly risk surging is when the EGR is active and the throttle valve is partially closed (this is done to create a larger pressure drop and help to flow more EGR) because, with the plate closed, the system volume is artifically less and can cause the surging (sounds like a chortling sound coming from the airbox). Since we optimized the EGR to be shut (and hence the throttle plate is open), surging really isn't an issue.

So, in the end, the SEGR won't have a vastly negative impact on how the GDE calibration operates.

Thanks,
GDE
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CRD Joe
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Joined: 18/07/2009 21:11:02
Messages: 45
Location: Seattle, Washington
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GDE, I havent installed my SEGR yet. Do I really need to with your flash? I DONT WANT THE DAMN THING OPERATING!

'05 CRD
Suncoast, Transco, Inmotion, Provent, ORM Snorkle, HID's, 2.5" Cat back no muffler, V6 Airbox, Fumoto, Cat 2 filter
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 372
Location: Southeast Michigan
The SEGR will not add any value over and above the GDE tune. No need to install it if you are planning on the tune.
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CRD Joe
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Joined: 18/07/2009 21:11:02
Messages: 45
Location: Seattle, Washington
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Thanks. I plan on it.

'05 CRD
Suncoast, Transco, Inmotion, Provent, ORM Snorkle, HID's, 2.5" Cat back no muffler, V6 Airbox, Fumoto, Cat 2 filter
dgeist
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Joined: 21/07/2009 10:57:32
Messages: 9
Location: Atlanta, GA
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GreenDieselEngineering wrote:The SEGR will not add any value over and above the GDE tune. No need to install it if you are planning on the tune.


One comment here (and it has nothing to do with the GDE tune). If you leave the EGR closed you don't ever have to worry about premature failure...
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