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FNG TRUCKER - 9/21/2017 8:33:14 PM
   
dd15 lack of power up hill
I have a 2011 freightliner Cascadia with ADD 1510 speedy in automatic 10th year being direct drive and a 2.94 rear end. I Pull a flat bed normally almost fully loaded about 78 to 79000 pounds And I really have a Hill where I don't lose speed on. i have a scan gauge or and it says I am only getting a max of 380 horsepower. if you do the math with the rpms that equates to about 1300 lbs of torque. I also have Michelin super singles. I really need help because I struggle running the little hills they have here in NC AND SC so I can never leave the east coast and make so.e real money.

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Jeff Clark - 10/11/2017 11:26:35 AM
   
RE:dd15 lack of power up hill
What RPM are you running the hills at?

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FNG TRUCKER - 10/12/2017 5:21:13 AM
   
RE:dd15 lack of power up hill
I normally run the hills at 70 mph at 1500 rpms so I can make it up. if I am not at that speed or rpm I drop to about 50 mph in 9th gear at 1600 rpms

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Henry Albert - 10/12/2017 7:51:47 AM
   
RE:dd15 lack of power up hill
Your engine makes its torque between 1000 and just a shade over 1400 RPM's . Use it to your advantage. Make sure you are not hitting kick down mode on your throttle pedal as it will make the transmission shift down prematurely. Torque falls off at higher RPM's and the power is in the basement of these engines . It sounds good at high RPM's but all you are doing is making noise .

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FNG TRUCKER - 11/10/2017 1:12:16 PM
   
RE:dd15 lack of power up hill
I completely understand the torque curve but there is no torque in a low rpm when I'm at highway Speeds . According to my scan gauge no matter my rpm range the highest horsepower I have yet to see is still 100 horsepower shy of what my peak rain should be of 455 . I believe I have a fuel pump or fuel metering valve that is going bad because now I have a code SPN157FMI16 Fuel pressure to low . My PLV valve was hitting over 50 on the counter so we had that replace along with the fuel pressure sensor since that seemed like the obvious issue But this did not work I had freightliner run a test Par the Detroit diagnostic software and we seem to have an internal leak . I'm curious to know if this is my high pressure fuel pump or possibly the fuel quantity Valve . Has anyone seen these codes before And if so could this be the reason I had the lack of power it just was not bad enough to throw a code until now

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