View Poll Results: Mileage changes from a 140v IDM
Increase (Respond how much)
1
16.67%
Nothing
2
33.33%
Decrease (Respond how much)
1
16.67%
I like rolling coal more than mileage
2
33.33%
Voters: 6. You may not vote on this poll
Mileage changes from a 140v IDM
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
I voted rolling coal too much to care. I wasn't tracking mileage very close when I put mine in. If you need to justify it to the war department (wife/girlfriend/parents who hold your credit card) YES IT INCREASES MILEAGE (and decreases green house emissions)
Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
I said nothing, if it did, it wasn't enough to notice. you could make more of an adjustment by just changing driving habits. I'd categorize it as a "performance" mod, injectors open sooner and stay open longer.... so.... you be the judge!
-Robb
-Robb
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
I picked increase, but could just have easily picked no change. My fuel economy is just a tick higher, like two tenths on average. The upside of that is she's been doing just a hair over 18 MPG this summer, which has never happened before.
Post Fiend
Joined: Mar 2007
Posts: 9,010
Likes: 5
From: Johnson City, TN.
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Fleet Mechanic
Joined: Mar 2007
Posts: 1,313
Likes: 6
From: Rio Rancho NM
So would a performance gain be realized if you already have a chip? Would a high voltage IDM mod be redundant and not noticeable if you had a good chip - similar to not needing a 10K mod with a chip?
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Posting Guru
Joined: Feb 2008
Posts: 1,526
Likes: 1
From: Grass Valley, CA
The chip will adjust the pulse width, while the 140 IDM will make the injector soleniod more responsive to the pulse. so instead of taking .1ms to open it might take .05ms to open, and instead of it shutting in the last .2ms, it might shut in the last .1ms.
I dont have any real numbers but based on how it works, yes, it would give you more power even with a chip.
I dont have any real numbers but based on how it works, yes, it would give you more power even with a chip.
Fleet Mechanic
Joined: Mar 2007
Posts: 1,313
Likes: 6
From: Rio Rancho NM
So what is the highest factory IDM voltage and what year truck can they be found in? I'm totally comfortable swapping the resistor the mod write ups talk about, but I'd like to have a working spare if I do the mod. It is a direct swap between any 7.3 right?
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
The highest voltage IDM stock is 120 found in 00-03 trucks and vans.
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