05 aset performance issue

[Pullmaxdude]

We have a 2005 Granite with a Mack 10 speed. It pulls pretty decent when it finally takes off. It seems like it is waiting to see boost before it gives it more fuel, then pulls decent. When shifting it goes flat for a few seconds. When up shifting it is not as big of a problem. Down shifting when pulling a hill it sucks. That period of no power seems weird. We just bought this truck, and it is the only one with this engine. Our others are E6, or MPs. It’s not like a dead pedal, just very weak for a couple seconds and then starts to build power. No lights on dash, no smoke. Truck is out of Canada if that makes any difference. Yesterday was first trip with it so maybe I just need to drive it differently??

[Joey Mack]

this is a common complaint. some have replaced the injectors and the exhaust manifold with a manifold from and E-7 or E-Tech. then theres the programming in the ECU

[Pullmaxdude]

9 hours ago, Joey Mack said:

this is a common complaint. some have replaced the injectors and the exhaust manifold with a manifold from and E-7 or E-Tech. then theres the programming in the ECU

Thank you for your response. I definitely need to do something with it

[JoeH]

Does the truck have the Step 12b software update? I think this update fixed some throttle response issues.

Joey is referring to basically the EGR system delete on the ASET AI motors. They use restrictive exhaust manifold and turbo to create back pressure to feed exhaust back into the engine when an extra bump on the exhaust camshaft lobes open the exhaust valves on intake stroke.

Replacing the manifold and turbo with pre-ASET parts effectively deletes the camshaft egr function.

Edited 5 hours ago by JoeH