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Thread: LS1B Operating System Upgrade Help

  1. #11
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    Default LS1B Operating System Upgrade Help

    I did try to flash over the factory Chevy Express Van tune with no changes other than vats disabled and it still would not start.

  2. #12
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    You can’t do that. The conversion is 24x based not vortec 5.7 low res. An 02 express still ran a 5.7 vortec.

  3. #13
    Joe (Moderator) joecar's Avatar
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    I'm not familiar on what the trucks/van run, but Team208MS has a point, incompatible CKP signals... this will most likely be the reason for no start/run.

  4. #14
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    You have to modify a ls based tune for the conversion. Start with a truck 2156 5.3 and copy over info from there.

  5. #15
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    Agreed with Team208Motorsports and late to the party here.

    Looking at the TorqHeads 24x conversion kit, it runs the regular 24x/1x LS1 style setup not the low res the Express 5.7L/350 SBC uses. You need to use whatever base file it came with (Truck, F-Body, Vette) to keep the plug n play wiring. I'd guess F-Body or Truck, so grab a truck 12212156 OS and try that. Either 5.3 or 6L with appropriate trans segment and full flash it.

    Quote Originally Posted by joecar View Post
    I'm not familiar on what the trucks/van run, but Team208MS has a point, incompatible CKP signals... this will most likely be the reason for no start/run.
    Joe, the 02 Express Vans have a 5.7L SBC and the universal OS 12212156 which allows anyone with a SBC to easily run a LS1 512kb PCM and COS5. I.E. 96-00 Tahoe/Suburbans / C/K trucks that came with the Vortec Black Box PCM.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  6. #16
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    Default LS1B Operating System Upgrade Help

    I will execute these steps this weekend. Thank you all so much for the amazing knowledge and help!

  7. #17
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    Quote Originally Posted by fleshe View Post
    I will execute these steps this weekend. Thank you all so much for the amazing knowledge and help!
    fleshe,
    What did you end up using? I have a similar situation and need some help also. I did make a post. Do you have a tune file I could try?

    Thanks
    01Z06, A4, Huron Speed Twin 67/66's on a 347

  8. #18
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    Quote Originally Posted by RonnieW View Post
    fleshe,
    What did you end up using? I have a similar situation and need some help also. I did make a post. Do you have a tune file I could try?

    Thanks
    PM me your email and I'll send you the tune file.

    Sent from my Pixel 3 XL using Tapatalk

  9. #19
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    Quote Originally Posted by fleshe View Post
    PM me your email and I'll send you the tune file.

    Sent from my Pixel 3 XL using Tapatalk
    PM sent, maybe twice. Thanks for the quick reply!
    01Z06, A4, Huron Speed Twin 67/66's on a 347

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