Tuning an ecm

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Unidewking, Nov 5, 2019.

  1. Unidewking

    Unidewking Light Load Member

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    So my boss has a c13 in an internstional 9200i and it has been flashing 9-3 iva code for a while and we are just now gettin it to a shop. Looks like he is going to have the shop "tune the ecm" so as to not use the IVAs. So he was just wondering what all happens and what does a person do to the ecm and what would make it cost 1500 just to flash the computer. Thanks for any explanation
     
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  3. benjamin260_6

    benjamin260_6 Medium Load Member

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    It costs $1500 because that shop can do it and you can't.
     
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  4. RustyBolt

    RustyBolt Road Train Member

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    $1500? Does that come with an oil change, overhead and a 3 axle alignment?

    It doesn't cost $1500. He's being hosed! Unless the program he's getting is something no other shop has. I know Diesel Doctor was working on a program to remove the IVAs from the equation.
     
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  5. Unidewking

    Unidewking Light Load Member

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    Oh man i was afraid this is what i would hear. Yeah the shop said they would unplug the iva pigtails and think i heard something about back em out and flash the computer to not use or something. Well too late i guess. Live and learn. Thanks
     
  6. AModelCat

    AModelCat Road Train Member

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    I'd do a little research on deleting the IVA's if I were you. I seem to recall a lot of the guys on here with lots of Cat on-road engine knowledge saying that deleting the IVA's without going to a lower compression ratio will blow up stuff. The IVA's do something to limit pressures. Definitely read into it cause blowing a headgasket isn't cheap.
     
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  7. Unidewking

    Unidewking Light Load Member

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    Ok so i have done some reading into ivas and what they do in the past. From what i understand they are like a jake brake on the intake valve and hold them open on the start of the compression cycle to relieve some pressures there by reducing emissions. I thought that meant it was made to handle the amount of cylinder pressure without the ivas but maybe i should do more research. Thanks
     
  8. DieselTech_Aus

    DieselTech_Aus Light Load Member

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    IVAs are a jake brake for the inlet valve.

    Anyone that claims its for emissions is ill informed. They're to reduce cylinder pressure during operation. its needed because of the ridiculous compression ratio used from factory to generate the complete burn needed to meet emissions.

    without them the cylinder pressure is phenomenal. excessive cylinder pressure will make the liner flex more and chew into the deck faster. it will also generate additional heat. The most common failures seen are recessed liners causing head gasket failure and cracked cylinder heads.

    I would strongly recommend reducing compression back to the pre ACERT 16:1 if deleting IVAs. leaving it at 18:1 will still work, but the service life of the engine will drastically reduce.

    As for file cost. That is for 1 of 2 reasons. They have purchased the file to flash from someone and are simply marking it up when on selling to you, or they have spent countless hours of time developing the file with expensive software and hardware. either way they are recovering the cost of purchasing a file or capital invested into file development as the on sell to you.

    Yes, the flash is fast, but making the file wasn't.
     
  9. Unidewking

    Unidewking Light Load Member

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    Right now this truck has low 700k miles and this truck is for a farm so we dont drive too many miles. I did notice that when the light turned on she alway ran more towards 190 then 180 on coolant temp. Ok so im gonna compile some questions the place when we go pick the truck up. So how does one reduce compression ratio? My limited knowledge and experience makes me think it wouldnt be an easy job
     
  10. AModelCat

    AModelCat Road Train Member

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    You'd have to change pistons most likely.
     
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  11. Unidewking

    Unidewking Light Load Member

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    Yeah that dont sound good. Ill talk to the shop and see what all they do. Thanks
     
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