How many Flats U got?
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
I bottomed out my pump before it was rebuilt and upgraded. Not much effect on MPGs as long as you drive with a lighter foot. Any smoke visible out the tailpipe and you are loosing MPGs. Use the power intermittently only on rare occasions and your MPGs should hold fairly steady.
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Senior User
Joined: Mar 2010
Posts: 140
Likes: 0
I turned mine up just under 2 flat and it blows very little smoke going up the same hill that slowed us down last sat and today it was like it shifted gears better because of the new found power!
Senior User
Joined: Sep 2009
Posts: 233
Likes: 0
From: Northren MN.
What exactly is a flat? I figured that if I ever opened up my i.p. that I would figure it out. Now curiosity has me under it's evil control. I'm layed of now, and sitting around anyways, Maybe in a couple of days, I'll play around with it a little. Mine's n.a. so I don't think I'll get that much more out of it, but you never know. Maybe it's turned down a lot, I still don't think it has as much power as I feel it should have. But my butt dyno is getting a little heavier everyday.
Senior User
Joined: May 2008
Posts: 387
Likes: 1
From: Bald Knob AR
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Senior User
Joined: Mar 2010
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60deg = 1 flat and 90 deg is 1.5 flat, Would you agree Galute?
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Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
I'm up 2 flats, didn't notice any difference in mpg, got a little smoke and a little power. I'm gonna turn it up one more flat though. Since I got the hypermax intake, it wont smoke at all past 2nd gear so I think I have more room for fuel at higher speeds.
Postmaster
Joined: Apr 2008
Posts: 4,802
Likes: 1
Guys, this only matters if the pump's calibration before ya'll messed with it was the factory one, however since very few of us actually bough their trucks brand new back then I don't think counting flats and comparing on here is any meaningful... I for one know that my pump was turned down by the PO, then I turned it up 1 flat, then 1 more flat, still another flat up I was able to outsmoke a road tractor named "the Smokehouse" and living up to it, then I turned the pump down, then I advanced it, then turned it down some more, and I think I'm finally happy with how she is...
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
I assumed mine was still factory set as it wouldn't make a wisp of smoke when I got it and the PO was an old man. I guess you can't really be sure though, he could have had it turned down when the new IP was installed.
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Senior User
Joined: Mar 2010
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I took the little side cover off used a mirror and flashlight and could still never find that screw
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
Back when these trucks were new most pump shops if you ask them for more fuel would only go 10 percent, or that is what they called it. Even on a stock na motor plaaying with the fuel screw without installing a pyro is playing with fire. I am not saying don't do it, but you need a pyro before you turn it up, if for no other reason, you can adjust your driving habits to the way your diesel works and performs best.