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Old 06-23-2015, 10:01 PM   #1
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Location: British Columbia
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CAT C15 550hp 1850 ft.lb

Oh baby, just had the CAT turned up and wow. Ran the Coquihalla from Vancouver to Kamloops at 70mph plus. Fuel mileage down a bit but doesn't drop 3 gears like it did before. Yahoooo

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Old 06-23-2015, 10:36 PM   #2
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Power does cost a bit of fuel, doesn't it? An extra couple hundred foot pounds of torque can really make a huge difference in driveablity. Just be careful with the throttle unless your transmission is rated for 1850 foot pounds of torque.

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Old 06-23-2015, 11:24 PM   #3
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LOVE IT !! You can never have too much power !
NOTE; I am not responsible for typos, poor grammer or misspelled word !
04 Itasca, Meridian 34H, 330 Cat/2003 CR V Toad
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Pvt. E1 Retired, Shadow Hills,Ca.
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Old 06-24-2015, 07:33 AM   #4
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Where and how did you "get it turned up"?
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Old 06-24-2015, 09:20 PM   #5
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I have been talking to CAT dealers for a couple years now to rerate my truck. I have an Eaton Autoshift 13 speed rated at 1650 torque and because of this no one would assume the responsibility.
I talked to Eaton and there is minimal difference between a 1650 and 1850 torque trans, so we rationalize that because all this beast weighs is 48000 lbs, probably wouldn't have problems overloading drivetrain.
So I approached the Kenworth dealer in Langley BC (has to be a CAT TEPS dealer) and they agreed to rerate but I had to sign a waiver so that they wouldn't be held responsible for any failure.
Off the record, the chargehand figured it would overheat before I had any drivetrain problems.
The Coquihalla is a fairly steep highway and temps stayed within limits even with ambient at 91 degrees. Pyro ran around 900 on the Great Bear snowshed so I don't think I am going to have any problems anywhere I run.
As a retired CAT mechanic, I know what this stuff costs to repair so I will watch my driving cause it could get costly if I break out in a case of stupidity.
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Old 07-09-2015, 09:18 AM   #6
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What kind of coolant temp do you feel comfortable with? I just got back from a road trip and on the steepest climbs my temp gauge went to about 200. Usually it sits about 185. As soon as cresting the top and heading down it would drop back right away. I have no idea what a "too high" coolant temp is. I don't have a pyro temp gauge on my truck.
MN is home for now.
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Old 07-11-2015, 10:49 PM   #7
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Bob, the software upgrade(not a chip) does burn more fuel and thus temps are higher now than what it was. Having said that, the dealer that did the reprogramming warned me about high temps (engine +235 and turbo +1100F) if it got anywhere near these-take your foot out of it.
So, big hills/91F ambient engine temp comes up to 220 and turbo is around 900F. If I want the engine to stay cooler I can manually switch on the engine fan and then water temp stays a bit below 200. I think this is a pretty safe modification and should meet my expectations.
Still playing with this new found power and being careful 'cause failure is expensive.

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