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Mack engine a dud


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They are slow to accelerate.. If I am correct. The EECU uses road speed ramp up with throttle position to calculate the fuel needed to go down the road, all in the name of efficiency..  B S !! Are there any engine repairs scheduled ?

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The crazy thing Paul, is that i have probably worked on over 100 ASET engines and i know i have built over a dozen of each type.. I just laugh at myself at times.. 

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Just now, Joey Mack said:

The crazy thing Paul, is that i have probably worked on over 100 ASET engines and i know i have built over a dozen of each type.. I just laugh at myself at times.. 

Iv always said its important to be able to laugh at your self and the mistakes you make......we ALL make them at times....

Paul

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For sure..  I wish i was well versed in your truck.  It is before my time at Mack, and I don't recall ever seeing one.  Its good to see you are driving it.

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I can pull the software versions tomorrow and see what the  levels are and If it’s up to date. Also what size tires are you running?  These AI engines have a narrow horsepower/torque curve so high rear axle ratio and tall 24.5 tires can throw it out of the curve . 

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11 hours ago, cfd511 said:

Joey mack .

so

do i have the 370 or 400 . And is there anything to do to make it better. mods or bigger motor .

The truck was built with a 400, so that is likely what it will have unless it was changed afterwards.

As for power, the easiest route I've heard on this forum is installing an exhaust manifold from an ETECH motor to restrict it less, and a better turbo. I think that includes an ECM tune as well. There's a whole post that has more info than that, I'm sure someone can link you to it. 

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Truck is still listed as a 400 AI in the corporate mainframe. Still has all original software in it so bumping the VECU software to Step 12B would help with throttle response. Good news is it has 4.64 rear gears so you’re good regardless of tire size. To bump to 460HP the factory way you would need a turbo and injectors and the download. You really need to put a boost pressure gauge in it and see what your boost pressure is under a load , Factory spec is 30-38 psi but even 28 psi would ok . 

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