Ficm ?

LBZ

Super Moderator
Staff member
Jul 2, 2007
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i click on the link and got this



WTF is this?

That thread is in the McRat tuning section which is only accessible by those that have purchased EFI Live,tunes, or tuning from Pat.
 

Rhall

Old Skooler
Aug 12, 2006
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Spot on from what I know. It just amplifies the signal it recieves from the PCM.

I wouldn't feel very comfortable not cooling it in some way. I'm sure it develops a lot of heat. Maybe a race only truck would be fine. If you drive any distance on the street, I would make sure it get's plenty of cooling somehow.
I also find it inteseresting that these don't fail very often. I'd liked to know why and how the engineers did that. Just another thing i've been curious about.



FWIW i relocated mine to the passenger side fender, where the airfilter box usually is. I tried running a seperate cooling system through it, but had trouble with leaks, so just took it all off. From around july till september when my crank broke i had no problems running it without any cooling system. The way i looked at it is that it had too cool it down quite a bit just by moving it off the valve cover, probably more than hot fuel would ever cool it down. I dont drive my truck every day, but i do drive it on the street everyweekend, and sometimes to work, most of the trips to the track last year it was driven around 50 miles there, and back. I had no problems.
 

juddski88

Freedom Diesel
Jul 1, 2008
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i have never opened the harness so here is my question - Are any of the wires a special braided wire or anything other than standard jacketed copper wire? and would a longer harness negatively affect the timing of the injection signals?

if i relocate mine i had planned to put it on the driver's side with the return fuel running through it. i didnt want to have to hack the harness too bad.
 

A_T_Ver

Member
Jul 31, 2007
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FWIW i relocated mine to the passenger side fender, where the airfilter box usually is. I tried running a seperate cooling system through it, but had trouble with leaks, so just took it all off. From around july till september when my crank broke i had no problems running it without any cooling system. The way i looked at it is that it had too cool it down quite a bit just by moving it off the valve cover, probably more than hot fuel would ever cool it down. I dont drive my truck every day, but i do drive it on the street everyweekend, and sometimes to work, most of the trips to the track last year it was driven around 50 miles there, and back. I had no problems.
Any pics of how you relocated it? Getting it off the valve cover should get the temps down quite a bit i'd imagine. Any idea on how much your temps dropped?
 

Rhall

Old Skooler
Aug 12, 2006
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i have never opened the harness so here is my question - Are any of the wires a special braided wire or anything other than standard jacketed copper wire? and would a longer harness negatively affect the timing of the injection signals?

if i relocate mine i had planned to put it on the driver's side with the return fuel running through it. i didnt want to have to hack the harness too bad.

Just regular jacketed copper wires. I used 18g i believe, and a solder gun to extend mine. I only had to extend it around a foot or so.
 

Rhall

Old Skooler
Aug 12, 2006
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Any pics of how you relocated it? Getting it off the valve cover should get the temps down quite a bit i'd imagine. Any idea on how much your temps dropped?

Im not sure on internal temp that it dropped, but when your trucks been running for a while, i know you cant just lay your palm on the ficm because of the heat, after the relocation you can. Ill try to dig up some pics.
 

ZeroGravity58

Well-known member
Mar 23, 2008
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FWIW i relocated mine to the passenger side fender, where the airfilter box usually is. I tried running a seperate cooling system through it, but had trouble with leaks, so just took it all off. From around july till september when my crank broke i had no problems running it without any cooling system. The way i looked at it is that it had too cool it down quite a bit just by moving it off the valve cover, probably more than hot fuel would ever cool it down. I dont drive my truck every day, but i do drive it on the street everyweekend, and sometimes to work, most of the trips to the track last year it was driven around 50 miles there, and back. I had no problems.

This is what i wanted to hear. I drive mine almost every weekend and was afraid of not running any fuel through it. I like to move mine and try it. I havent done it in awhile but i remember along time ago sitting in traffic in the summer with one of my old handheld tuners and it was saying fuel temps were 130+ degrees :eek:
 

paint94979

Beer Nazi
Sep 18, 2006
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This is what i wanted to hear. I drive mine almost every weekend and was afraid of not running any fuel through it. I like to move mine and try it. I havent done it in awhile but i remember along time ago sitting in traffic in the summer with one of my old handheld tuners and it was saying fuel temps were 130+ degrees :eek:

yes Fuel Temps get some hot... i like that idea Rhall putting in near the fender, it is either cooler or close to the same temp without running fuel through it. I would be interesting for someone to do test study on what temps the FICM gets to while no fuel is being run too it?
 

bullfrogjohnson

Big Girl!
Nov 20, 2006
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yes Fuel Temps get some hot... i like that idea Rhall putting in near the fender, it is either cooler or close to the same temp without running fuel through it. I would be interesting for someone to do test study on what temps the FICM gets to while no fuel is being run too it?

Hopefully TNRgreene will pop in here, He did alot of testing on this and relocated his to the drivers side.
 

delong_1

<< my work
Dec 5, 2008
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anyone running the ficm dry on a dd, i've got a spare just in case but im not sure if i want to be the test dummy. i dont like where its at beside the exhaust housing and would rather not have fuel lines run to where i would like to put it.
 

Rhall

Old Skooler
Aug 12, 2006
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he said he drove it around a bit but i will most likely see a few several hour trips with mine.

Mine was mounted on the passenger fender in the front corner, kinda away from the charger, i imagine the air going through the headlight assembly would cool it pretty well, i dont want to see you ruin one, but i would have to think they would stay cooler there dry, than on the valve cover with hot fuel going through them.