2006 Mack CT713- low power

[rhardy30]

Hey, 

just bought a 2006 Mack CT713. Yesterday was my first day driving it and I found it to be underpowered for my liking. I found you needed to be in the 1600-1800 rpm range to make any power and that still was not much.  
I also found that I could get my egt’s to 1000 degrees quickly if I wasn’t paying attention. (air filter is brand new). It had a light black smoke coming from the stacks but nothing crazy. It also burnt around 500 litres of fuel yesterday. (3, 3 hour long trips. 1 hour on highway empty, .5 loading/ in pit, 1 hour loaded on highway, .5 unloading) I was 45,300 kgs loaded (tandem truck and tri pup) 

Question 1- How do I tell what engine is in the truck? It has a engine tag but because it was a reman it has no info on the tag. 

Question 2- What are people doing to make bigger power out of these trucks? Where can you find aftermarket injectors/ turbos/ cams. 

Question 3- what’s the normal rpm range on these trucks? 
 

Question 4- what’s normal highway egts? What’s max?

 

Thanks, Ryan


 

[R.E.D]

https://www.bigmacktrucks.com/topic/50251-mack-ai460-ai427-ami-low-torque-low-horsepower-poor-fuel-mileage-granite-dead-dog-remediation/?do=findComment&comment=372944

[Mackpro]

If you got that high of exhaust temps then possible boost pressure leak. While the AI engine is fairly reliable, 4.3 MPG was the usual average of all my buddies CV713’s . I always drove them with throttle pedal to the floor, loaded or unloaded. Does it have a turbo boost/manifold pressure guage in the upper left corner of the dash?

[rhardy30]

On 9/3/2022 at 1:27 PM, R.E.D said:

https://www.bigmacktrucks.com/topic/50251-mack-ai460-ai427-ami-low-torque-low-horsepower-poor-fuel-mileage-granite-dead-dog-remediation/?do=findComment&comment=372944

Thank you! A lot of good info in this post! 

[rhardy30]

22 hours ago, Mackpro said:

If you got that high of exhaust temps then possible boost pressure leak. While the AI engine is fairly reliable, 4.3 MPG was the usual average of all my buddies CV713’s . I always drove them with throttle pedal to the floor, loaded or unloaded. Does it have a turbo boost/manifold pressure guage in the upper left corner of the dash?

I do. It seems to be building and holding its boost perfect once you give it the rpm’s. I’ve only got to drive the truck the one day and at the start of the week going to be going through it better and hopefully figuring out some issues. The high egts are this first issue I need to figure out. Keeping your foot into the old girl isn’t an option with this old girl. 
The truck has sat for a couple of years now so I’m hoping I’m able to bring it back to life and make some money with her. 

[Joey Mack]

How about putting Stanadyne in the fuel filters and the tanks, and running it hard?    Jojo

[Joey Mack]

About a 1:400 ratio...  

[fjh]

How’s the air filter? Cheap and easy stuff first? These filters plug up fast!

Edited September 5, 2022 by fjh

[R.E.D]

These engines have a scavenge bump of the camshaft lobe..which makes them intake some exhaust gas with the fresh pressurized air..it makes the oil very dirty and easily full of sludge.I find that every time my engine is getting close to the oil change, the egts also Begin to climb.

[Vmac3]

Had a 2005 granite with a broken baffle in the muffler causing high EGTs. Remove the exhaust pipe going into the muffler and road test it. See what happens.

V

[JoeH]

On 9/4/2022 at 5:23 PM, rhardy30 said:

I do. It seems to be building and holding its boost perfect once you give it the rpm’s. I’ve only got to drive the truck the one day and at the start of the week going to be going through it better and hopefully figuring out some issues. The high egts are this first issue I need to figure out. Keeping your foot into the old girl isn’t an option with this old girl. 
The truck has sat for a couple of years now so I’m hoping I’m able to bring it back to life and make some money with her. 

You should be getting 31 psi of boost out of the truck.  I had a cracked charge air cooler on one of my trucks that wouldn't let the truck go above 25 psi. Also ran high egts. Night and day difference in performance when I replaced the CAC.