Lowest Air Pressure - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 06-10-2012, 07:46 PM Thread Starter
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Lowest Air Pressure

what is the lowest air pressure we can run in the tires before tripping the TPMS without having anything done to the truck from ford.

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post #2 of 9 Old 06-10-2012, 08:17 PM
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I think 25 psi.

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post #3 of 9 Old 06-11-2012, 01:35 AM
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Less air in tires means less miles per tank too.
I heard below 60lbs it goes off.

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post #4 of 9 Old 06-11-2012, 06:00 PM
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In an F350 it is 68 in the rear tires and 58 in the front IIRC.
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post #5 of 9 Old 06-11-2012, 07:17 PM
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Pretty sure its less than 50 lmao

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post #6 of 9 Old 06-11-2012, 08:35 PM
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I'm running 65psi on all 4 tires when I'm not towing in my '12F350 ccsb srw and don't have any tpms warnings. When I tow I bump my rear tires up to 75-80psi depending on the weight I'm hauling, but as soon as I unhitch I drop my tires right back down.

I have found that I get less of that "bucking/bouncing" feeling on concrete roads with the lower tire pressures when unloaded.

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post #7 of 9 Old 06-11-2012, 08:36 PM
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I'm running 65psi on all 4 tires when I'm not towing in my '12F350 ccsb srw and don't have any tpms warnings. When I tow I bump my rear tires up to 75-80psi depending on the weight I'm hauling, but as soon as I unhitch I drop my tires right back down.

I have found that I get less of that "bucking/bouncing" feeling on concrete roads with the lower tire pressures when unloaded.

2012 F350SRW CCSB

H&S Mini Maxx with MCC, Spartan with war hammer(FOR SALE), 5" down pipe back exhaust, AFE Stg 2 Cold Air Intake, 6k 55w HIDS, Eagle Alloys 014 20x9 0 offset wheels, 35x12.50R20 Toyo Open Country AT2 Xtreme, UWS toolbox

Inside- Pioneer AVH3200BT, 2 Kicker CVT 12's, Kicker ZX1000, 4 gague wiring, Custom sub box, 20% tint all the way around
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post #8 of 9 Old 06-12-2012, 12:29 AM
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My Han****'s max out at 60 psi. I had to have the dealer reset the sensors to make them go off.

2012 SBCC 6.7L FX4

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post #9 of 9 Old 06-12-2012, 04:55 AM
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Quote:
Originally Posted by mysticblu999 View Post
Pretty sure its less than 50 lmao
Uh, nope - at least if it's working the way it's supposed to.

Dealer reset my TPMS setting to 65psi in rears, the same as front, as I dropped mine to 60psi and the alert was constantly on. They told me there was a 15% low/high trigger for the alert. So I tested it -

56psi (14% low) - no alert (drove this way for abt 100 miles)
54psi (17% low) - alert came on within 10 miles of driving after lowering pressure from 56psi to 54psi

So I'd say that 15% is accurate. I'm gonna test the high side - I'll air 'em up to 76psi (17% high, so alert should come on) prior to going to pick up our TT tomorrow for our trip. I'll report back my findings.
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