Reduced exhaust braking after demandate

[jaysoto]

This is for a L9 with only the exhaust brake so I apologize if I put this in the wrong section but basically overall the truck runs fantastic since I demandated it great fuel economy great power everything is great except it seems like my exhaust brake is weaker than it was before. Just curious if this is because there is less back pressure? Or if anyone else has noticed it. Is it controlled in the tune where you could in theory make it work better? Turbo and actuator are good I just replaced the actuator this spring before the demandate and it works and tests fine. Another thing is if I'm at 1900rpm and I let out of the throttle and the exhaust brake kicks in the turbo flares a bit like it kicks in strong then backs off then back to strong. I believe it's always done that but I really don't feel any braking ability until I get down to maybe 1300rpm. It seems like at that point the exhaust brake is fully engaged/vanes fully closed. Maybe I'm overthinking but I would bet hands down it was stronger before. Thanks

[Rawze]

If your able to back up/restore the ecm yourself, then take it on a test drive and screen record what its doing (using the 'OBS studio' software).

While recording, in Insite, monitor the following live data ...

== the engine brake status for stage 1,2,3
== the turbo position commanded
== the turbo position measured.
== Boost level.
== Exhaust pressure level.
== fuel pedal position.

.. then flash the clean factory programming back in it temporarily and do the same recording and same test drive to see if the engine brake and turbo are acting similar.

[jaysoto]

(Yesterday )Rawze Wrote:  If your able to back up/restore the ecm yourself, then take it on a test drive and screen record what its doing (using the 'OBS studio' software).

While recording, in Insite, monitor the following live data ...

== the engine brake status for stage 1,2,3
== the turbo position commanded
== the turbo position measured.
== Boost level.
== Exhaust pressure level.
== fuel pedal position.

.. then flash the clean factory programming back in it temporarily and do the same recording and same test drive to see if the engine brake and turbo are acting similar.

Thanks not sure why i didn't think of screen recording it instead of trying to watch it while I drive. I will do that when I get a chance. If I flash the factory file back in won't it go into derate as soon as I get out on the road? I may have to try it at a low traffic time of day

[jaysoto]

(Yesterday )Rawze Wrote:  If your able to back up/restore the ecm yourself, then take it on a test drive and screen record what its doing (using the 'OBS studio' software).

While recording, in Insite, monitor the following live data ...

== the engine brake status for stage 1,2,3
== the turbo position commanded
== the turbo position measured.
== Boost level.
== Exhaust pressure level.
== fuel pedal position.

.. then flash the clean factory programming back in it temporarily and do the same recording and same test drive to see if the engine brake and turbo are acting similar.

Thanks not sure why i didn't think of screen recording it instead of trying to watch it while I drive. I will do that when I get a chance. If I flash the factory file back in won't it go into derate as soon as I get out on the road? I may have to try it at a low traffic time of day