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Thread: Upgrading VP ECM From 160 To 8192 ???

  1. #1
    Variable Bitrate mayhembdm666's Avatar
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    Upgrading VP ECM From 160 To 8192 ???

    Okay this is one for the mechanics and electricians.

    First of the information about the GM 1227808 ECM can be found here for a quick summary overview.Tech Edge - 1227808 Info

    Now going by what is said on that page, The 7808 ECM lacks a single IC "U2 (SXR chip)" that enabled the 8192 Baud rate... Now i have two questions here in short.

    1: Can you replace the 7808 with a new model that has the 8192 speed, Say from a new model commodore?

    2: Is there spot on the 7808 where you can replace/add this IC?

    Looking at the picture there does not seem to be a blank section on the circuit board in which this IC would be placed, not from the side of the board i can see in the pic. So im thinking if it was possible to mod the board, It would need to be a IC replacement and after that i'm guessing a new flash?

    I'm going out on a limb here as i have alot of mods already done to my car and the main mod i want is a LCD based dash to replace the instrument cluster but a 1 single update per second is not the speed i really would like for things live RPM.

    This could be an interesting project and a possibility for those who want to use OBD2.

    Any information here would help,
    2004 Holden WL Caprice Auto GENIII
    Base System = Raspberry Pi
    Everything else is pending for now as switched from a Mini-ITX setup

  2. #2
    Constant Bitrate
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    What people have done in the past is rewritten the ecm code to dump/substitute the parameter of interest in 2 or 3 places inside of the ALDL frame thus doubling or trippling the "data rate"

  3. #3
    Variable Bitrate mayhembdm666's Avatar
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    So basically say if we have 20 parameters. and i only want 10... i would get double speed... Hmmmm, It is a good option for alot of people and i'm sure it would working thinking about it.. But i really dont want to give up that option.. Im sure there is a newer unit that can be installed in replacement of this one that should work.. Might have to start looking at a few of the new cars and see the differences in them.

    Otherwise it looks like its time to do some custom sensor modding and then follow your suggestion and speed up the remaining parameters. First step... reading the stream to the dash for speed/rpm/temp/fuel/ and all that.
    2004 Holden WL Caprice Auto GENIII
    Base System = Raspberry Pi
    Everything else is pending for now as switched from a Mini-ITX setup

  4. #4
    Variable Bitrate mayhembdm666's Avatar
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    I dont suppose i can run multiple ECM's? as in the extras in a read only mode?
    Have'nt had time to study them or rip mine out as car atm is on the road every day n cant afford the time to take it out...?

    But just a thought? Surely someone has done something like this or knows a good autoelectrician?
    2004 Holden WL Caprice Auto GENIII
    Base System = Raspberry Pi
    Everything else is pending for now as switched from a Mini-ITX setup

  5. #5
    Newbie ElCap's Avatar
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    Quote Originally Posted by mayhembdm666 View Post
    Now going by what is said on that page, The 7808 ECM lacks a single IC "U2 (SXR chip)" that enabled the 8192 Baud rate... Now i have two questions here in short.

    1: Can you replace the 7808 with a new model that has the 8192 speed, Say from a new model commodore?

    2: Is there spot on the 7808 where you can replace/add this IC?

    Looking at the picture there does not seem to be a blank section on the circuit board in which this IC would be placed, not from the side of the board i can see in the pic. So im thinking if it was possible to mod the board, It would need to be a IC replacement and after that i'm guessing a new flash?
    Hey mayhem,

    1. yes u can replace the '808 ecu with the 1227165 ecu. thats the usa version, its exactly the same but it has the 8192 baud ic instead of the slow 160baud. apparently its a straight swap too

    2. yeh theres a way to mod the current ecu as its about $100-150 for the 1227165 ecu. it involves soldering 4 wires to points on the 808 ecu and then connecting that to a max232 serial to ttl converter which then connects to ur serial port on ur pc.

    for more details on this, check out OBD GM ALDL software and have a read of the rest of the thread. Also, check out this thread from delco-hacking.net http://www.delcohacking.net/forums/v...27808&start=10

    Im in the middle of doing this, but its been put on hold for other things.
    ive got the wires soldered and connected to the converter but havent had a chance to test it.

    Good luck and im keen on hearing how u go with this!

    Rob

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