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Thread: EFI dilemma

  1. #11
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    Does that FI system adjust for altitude changes with a barometric sensor, or something? I would think that would be a must have living in the mountains.

  2. #12
    Registered Member BamaNomad's Avatar
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    Quote Originally Posted by WagonCrazy View Post
    I think you found the cheapest way out of your dilema (ie. finding an old laptop running XP).
    .... portions deleted....
    Find a working, XP based laptop, and hang onto it for future tuning. Problem solved.
    and.. IMO.. you don't want to connect that computer to the internet, becasue if you do, it would not be the first time that MS did an 'automatic update' to your obsolete, but functioning, computer and made it never work again! (They did that to an NT pro system I'd been using for years... saying it was the last time they would 'provide a fixes' update; I bought their BS and let it happen.. that computer never booted up again after that 'upgrade'... It seems obvious to me that's another part of MS's approach, forcing us to buy NEW computers and with it of course, NEW OS...

  3. #13
    Registered Member NickP's Avatar
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    Quote Originally Posted by chevynut View Post
    Well the good news is I went down into my basement and found two old laptops that I had from work. One is a Compaq EVO N610C but it has no battery in it and the other is an even older HP Omnibook. I plugged the Omnibook in and it won't even turn on. I plugged the Evo in and it came to life and booted.....XP Professional.

    I can't connect to the internet via my router for some reason but I'm not sure I care. I downloaded the latest C950 Software and 502 base maps on my main home computer and put then on a flash drive, then loaded them onto the Evo. I am now able to run the C950 software and the base maps loaded too. The Evo even has a serial port for the interface cable.

    The only thing I need to do is buy a new battery....found them on eBay for $18.89 plus $5.50 shipping so I have one on order. Not sure what happened to the old one but it must have gone dead and I disposed of it or something. Looks like the last time I used this computer was 2007 based on the documents list.

    Whew! What a relief. If I was looking for a new EFI ECU I would probably get the HP EFI or some other compatible unit, but I really think the C950 will do everything I need even though it's "obsolete". I'd better get this car done before internal combustion engines are obsolete.

    I don't know what version of firmware I have but Doug Fant was the guy who upgaded it for me a few years ago. Hope it's the latest.
    If your present LapTop is non functional, let me know and I'll send you my old Dell. I just replaced the battery too. It's an XP Pro machine.

  4. #14
    Registered Member chevynut's Avatar
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    Quote Originally Posted by 55 Rescue Dog View Post
    Does that FI system adjust for altitude changes with a barometric sensor, or something? I would think that would be a must have living in the mountains.
    It uses a MAP sensor.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


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  5. #15
    Registered Member chevynut's Avatar
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    Quote Originally Posted by BamaNomad View Post
    and.. IMO.. you don't want to connect that computer to the internet, becasue if you do, it would not be the first time that MS did an 'automatic update' to your obsolete, but functioning, computer and made it never work again! (They did that to an NT pro system I'd been using for years... saying it was the last time they would 'provide a fixes' update; I bought their BS and let it happen.. that computer never booted up again after that 'upgrade'... It seems obvious to me that's another part of MS's approach, forcing us to buy NEW computers and with it of course, NEW OS...
    Really good point, Bn! I think I'll actually disable upgrades and network connections.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  6. #16
    Registered Member chevynut's Avatar
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    Quote Originally Posted by NCW View Post
    If your present LapTop is non functional, let me know and I'll send you my old Dell. I just replaced the battery too. It's an XP Pro machine.
    Thanks Nick. Right now I think I'm set, but if I can't get it to work in the future I'll let you know. Don't throw it away!

    To think that the C950 was brand new when I started working on this car.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  7. #17
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    Again, I'll cite the acceleration enrichment improvement of the HP EFI with updated s/w. There are probably more things like that. And that's an update for HP - no telling what was improved from original HP over the 950, but you can bet that there were several things.

    Is the number of fuel and spark table cells the same between 950 and HP? Stock systems have more than even the HP.

    And, like the old MS stuff, the 950 isn't supported with software updates any more. You may be OK - but you won't know what you're missing either.

  8. #18
    Registered Member chevynut's Avatar
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    To be honest, I've never programmed any EFI system so far but I did stay ay a Holiday Inn. I have read a little about it and I understand the concepts, just not the details.

    The fuel map is looks like it's 16x16 to me.

    Here's what they say about the HP EFI:

    "Can be set to 31x31 or 16x16 with user adjustable axes. 8x8 Target Air/Fuel Ratio table"

    There's an acceleration enrichment table, another one showing O2 sensor data, a table for temperature compensation and it features an internal datalogger that can be turned on with a switch.

    Here's the entire C950 user manual. It seems to have quite an impressive capability to me. I'm sure the HP EFI is much better as far as better map resolution, and for used in boosted applications or NOS. The learning function probably makes tuning a lot simpler too.

    https://www.google.com/url?sa=t&rct=...-JbH1cW_YVcbDg
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  9. #19
    Registered Member chevynut's Avatar
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    Here's an example of the C950 engine parameters screen:



    And a fuel map:




    Here's the fuel in 3D



    The spark map is similar:



    And here's the acceleration enrichment table:



    This is an example of what you get from the datalogger:



    And here's some O2 sensor inputs...

    Last edited by chevynut; 07-29-2017 at 12:03 PM.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

  10. #20
    Registered Member chevynut's Avatar
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    And I just found this....appears to be some good info!

    http://www.binderplanet.com/forums/i...thread.125589/
    Last edited by chevynut; 07-29-2017 at 12:07 PM.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

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