IDM Mod
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Post Fiend
Joined: Feb 2007
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From: Dallas-Ft. Worth
IDM Mod
So I was perusing the list on 7point3 now that it's back, and I read the IDM mod page here:
http://www.forgotton.net/diesel/idmmod/index.htm
Has anyone done this? I'm thinking about a couple easy ones before the pace picks back up at work. Is there any reason not to do it since I have the DP? This one and the home-made high-idle are looking pretty good:
https://www.ford-trucks.com/forums/2...-2002-psd.html
http://www.forgotton.net/diesel/idmmod/index.htm
Has anyone done this? I'm thinking about a couple easy ones before the pace picks back up at work. Is there any reason not to do it since I have the DP? This one and the home-made high-idle are looking pretty good:
https://www.ford-trucks.com/forums/2...-2002-psd.html
Posting Guru
Joined: May 2006
Posts: 2,274
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From: Milroy, PA
Theres a fella on PSN that does that for people with the SD 7.3s aswell, people seem to notice an increase. Im waiting on a pm in return from a reputable, and DIRECT source to possibly confirm it.
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Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
Cool -- lemme know what you hear. I've been soldering SMT for almost 20 years, so I don't need anyone to do it for me. I was just wondering if it was a big deal when running Jody's tunes. Maybe I should've named the thread "DP Tuner & IDM Mod". According to the linked info, the guy had some kind of chip on it (especially considering the HP & torque at the wheels). I couldn't tell which one, but I figure it would be best to ask.
Posting Guru
Joined: May 2006
Posts: 2,274
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From: Milroy, PA
Yea Ill let you know what they found, it wouldnt hurt to see what jody has to say. I read about that a long time ago, before I ever had a chip, and I thought someone told me once the SD trucks already were higher voltage then the OBS trucks.
Postmaster
Joined: Dec 2005
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The IDM mod ups the electrical charge to the injectors, this can't be done through tuning. Its fine to do it with any chip box or whatever.
IIRC..There are 3 different IDM's that were produced for the 7.3 powerstroke, I think they were something like 100V, 110V, and 120V. 120V being the highest made and was in the later trucks. This mod is getting the voltage to 140V.
This is from Joe Servo, the originator, this is exactly what the IDM mod actually does...
Injectors are very inductive loads, similar to light bulbs. When you turn on a light bulb, it does not turn on right away. it takes time for current to flow through the bulb. Time here is in millionths of a second (us). By changing some parameters on the IDM, i turn on the injectors faster and therefore keep them on longer since the PCM does not know it has happened. With a stock IDM, the injectors take 560 us to fully turn on , with the IDM mod, injectors turn on in 440us.
IIRC..There are 3 different IDM's that were produced for the 7.3 powerstroke, I think they were something like 100V, 110V, and 120V. 120V being the highest made and was in the later trucks. This mod is getting the voltage to 140V.
This is from Joe Servo, the originator, this is exactly what the IDM mod actually does...
Injectors are very inductive loads, similar to light bulbs. When you turn on a light bulb, it does not turn on right away. it takes time for current to flow through the bulb. Time here is in millionths of a second (us). By changing some parameters on the IDM, i turn on the injectors faster and therefore keep them on longer since the PCM does not know it has happened. With a stock IDM, the injectors take 560 us to fully turn on , with the IDM mod, injectors turn on in 440us.
Last edited by John311t; Dec 26, 2007 at 12:47 AM.
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Post Fiend
Joined: Feb 2007
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From: Dallas-Ft. Worth
Yeah, the site I linked to above linked to that one where I read about it further. I'll have a look and see which IDM I have and go from there. Mine is an '02, and AFAIK, they didn't change a whole lot in '03 so I have pretty much the last version of the 7.3.
Good to hear from you again -- it's been a while...
Good to hear from you again -- it's been a while...
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Tuned
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Just a point of clairification that I'm sure no one cares about; a light bulb is not an inductive load since the inductance of a light bulb at 60 Hz is miniscule. The bulb is a variable resistive load. The resistance of the element increases as it heats up and this is what limits the current, not the very small inductance. At significantly higher operating frequencies the bulb will be come an increasingly inductive load.
Anyway, from looking at the graphs it appears that this mod shifts the HP band down about 150 RPM and increases torque at 60mph.
Does the increased torque for roughly the same HP at 60mph equate to/result in better fuel mileage?
Anyway, from looking at the graphs it appears that this mod shifts the HP band down about 150 RPM and increases torque at 60mph.
Does the increased torque for roughly the same HP at 60mph equate to/result in better fuel mileage?
Last edited by dcara; Dec 26, 2007 at 07:59 AM.
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Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Originally Posted by dcara
Just a point of clairification that I'm sure no one cares about; a light bulb is not an inductive load since the inductance of a light bulb at 60 Hz is miniscule. The bulb is a variable resistive load. The resistance of the element increases as it heats up and this is what limits the current, not the very small inductance. At significantly higher operating frequencies the bulb will be come an increasingly inductive load.
Anyway, from looking at the graphs it appears that this mod shifts the HP band down about 150 RPM and increases torque at 60mph.
Does the increased torque for roughly the same HP at 60mph equate to/result in better fuel mileage?
Anyway, from looking at the graphs it appears that this mod shifts the HP band down about 150 RPM and increases torque at 60mph.
Does the increased torque for roughly the same HP at 60mph equate to/result in better fuel mileage?
Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
Its more of a noticeable difference on the older trucks, where the jump in voltage is twice as much than the new ones. I heard it was not good to do with the PMR's, as their enemy is advanced timing. He already advances the timing as far as safely deemed possible. Then going and opening the injectors earlier is just going to increase the timing more. If you mentioned to jody that you have the IDM mod, i'd wager he would take a few degrees timing out, therefor neutralizing any benefit from the mod. Plus more voltage- possible overloaded circuit, and more heat. May burn up a wiring harness, and in extreme situation- truck fire.
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Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Originally Posted by strokin_it7.3
Its more of a noticeable difference on the older trucks, where the jump in voltage is twice as much than the new ones. I heard it was not good to do with the PMR's, as their enemy is advanced timing. He already advances the timing as far as safely deemed possible. Then going and opening the injectors earlier is just going to increase the timing more. If you mentioned to jody that you have the IDM mod, i'd wager he would take a few degrees timing out, therefor neutralizing any benefit from the mod. Plus more voltage- possible overloaded circuit, and more heat. May burn up a wiring harness, and in extreme situation- truck fire.