safe range when towing - Ford Powerstroke Diesel Forum
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Old 08-13-2010, 06:22 PM
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safe range when towing

I have an 08 f350 single rear wheel job3 with 37" tires on 4" lift. It has a spartan 250 tune, full exhaust and s&b intake. I pull a 35' fith wheel that ways around 9k lbs or so. When going up a hill my boost gauge pegs out at 40 psi. My question is....what are the safe limits for boost when pulling. Do I need to go to the 210 tune?? It just pulls so good on the 250 tune but I dont want to blow the truck up. Is there anything I need to keep a close eye on
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Old 08-13-2010, 06:29 PM
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You can watch boost on the DashDAQ to see what you are actually seeing. It is listed as Manifold Gauge Pressure. It's usually not boost you need to worry about....except if you blow off a boot. High boost is followed up with high exhaust back pressure, which can blow head gaskets. As long as your back pressure is under 70, then you should be good. Do you monitor tranny temp, engine oil temp, and engine coolant temp when you tow? Those are also very important.
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Old 08-13-2010, 06:53 PM
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All my temps seem to be normal. I have only been on two trips with my new camper. Is it safe to tow that much with the 250 tune and those big tires.
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Old 08-13-2010, 07:19 PM
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I personally wouldn't do it, but then again I don't tow....so I don't know for sure. Have you tried using the 210 Tow Performance?
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Old 08-13-2010, 07:26 PM
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I don’t think I would do that. Go to trailer life and ask over there and see what they tell you…
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Old 08-13-2010, 08:34 PM
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I pull 35' toy hauler with two Harley's in it roll across the scales at 14,240. My truck weighed 8420. The highest EGT I saw was 1120 going up a 4% grade. To me EGT is the biggest issue. Then keep an eyeon the trans temp. Do you have DPF Delete and an airbox? I use the edge tuner set on the second setting, my memory is failing me and I can't recall the power and tq on it. I know its not over a 100hp and unless your drag racing with your trailer on I don't see the need to go any higher.
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