Stocker seeing 35+ lbs of boost cruising up hill - Ford Powerstroke Diesel Forum

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post #1 of 20 Old 07-02-2010, 09:06 PM Thread Starter
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Stocker seeing 35+ lbs of boost cruising up hill

Just picked up a 08 last month. Love the truck. Truck sees 35+lbs of boost very easily without getting on it. I Took it camping last weekend and headed up into the hills. Had the cruise control set at 75 purring through some slight grades at 2000 RPM and noticed the boost guage was at 35+ lbs of boost. Truck didnt downshift was just puring along heading up a 7% incline. Is it normal for these trucks to make this much boost without hammering down on them? I headed up north today with some buddies to go riding and had 4 quads on the back of a flatbed trailer and noticed boost spiking without getting on it. Truck runs great but drank the piss out of gas heading up through the mountains with the cruise set on 75. The truck is stock with a 6 inch lift and 35's. Averaged 9.2 with 1500lb trailer and 4 quads weighing aprox 1600lbs. Couldnt even tell they were back there but the gas mileage dropped considerbly with small load and heading up into the hills. Truck averages 14.5 on flat highway driving nice. Just want to know if I should be concerned with how much boost i am seeing at part throttle. Thing has to drink gas if boost is at 35lbs. Truck still has extended warranty on it.

Look foward to hearing what you guys have to say.

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post #2 of 20 Old 07-02-2010, 10:28 PM
shhhhh, can you hear it?

 
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i think its normal the truck tries to stay in overdrive by using both turbos.if im wrong someone can correct me.to get that mpg up do a dpf delete and tuner

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Originally Posted by Diesel Tech Mag
All you need is a little knowledge,the right tools, and a buddy's truck to practice on.
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post #3 of 20 Old 07-03-2010, 04:07 AM
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All sounds right for a stock truck. As for the previous poster, the truck uses both turbos all the time.
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post #4 of 20 Old 07-03-2010, 05:53 AM
shhhhh, can you hear it?

 
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hmmm i thought i had read that there is a valve between the two turbos and if both arent needed then it cuts out the second one.

Patrick
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13.77@100.63

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Quote:
Originally Posted by Diesel Tech Mag
All you need is a little knowledge,the right tools, and a buddy's truck to practice on.
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post #5 of 20 Old 07-03-2010, 10:04 AM
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Quote:
Originally Posted by 08pwrstrokr6.4 View Post
hmmm i thought i had read that there is a valve between the two turbos and if both arent needed then it cuts out the second one.
That is incorrect, this is a sequential turbo system where the low pressure turbo always supplies the high pressure turbo. I wondered if the truck should be making that much boost as well because my 6.0 with an exhaust and intake and tune would make the same amount of boost this truck does stock, but i've come to learn that this truck is much better than the 6.0

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post #6 of 20 Old 07-03-2010, 11:38 AM
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btw dont put gas in your diesel..lol.
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post #7 of 20 Old 07-03-2010, 03:22 PM Thread Starter
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Thanks for the replies everyone. Any other stockers out there experiencing the same thing I am? Most people complain about not enough boost LOL.. Cruising down the freeway today on flat ground at 75 it was making about 8-10 lbs of boost with the cruise set. Just not using to seeing that much boost without trying to make boost IE putting foot into it. I love the truck and can't wait to Mod it. I transfered the warranty from Previous owner to me so I am good for another 4yrs or 200K. Just wanted to know if I should be concerened about this or not.

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post #8 of 20 Old 07-03-2010, 08:17 PM
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I know when I stomp on it I get my boost gauge up to about 32 lbs., so high boost is normal, we have very powerful trucks

2010 F350 Lariat 6.4, XLT, FX4

Current upgrades: International emblems, tinted windows, Husky toolbox, window vents, Rhino lined bed

Future upgrades: Cab clearance lights, leveling kit w/ 35's, AFE intake, H&S 5" exhaust, H&S Black Maxx

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post #9 of 20 Old 07-03-2010, 09:18 PM
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Hmmm...seems a little high to me. I have to really get on it to push it much past 30 during unloaded driving.
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post #10 of 20 Old 07-04-2010, 05:23 AM
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grossing at 17000lbs my boost sits at 15-20lbs straight and level and 30-35lbs at the slightest incline,but my trailer front is not aerodynamic....getting 9-11 mpg....empty boost is 0-10 flatland and hand calks at 15 mpg

2008 6.4 job3 F250 3:55 gears 10K gvw silver stretchcab 8ft box.timbrens and goosenek hitch.51 gal aux tank.
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