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Thread: 454 411 Swap

  1. #11
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    I snagged what appeared to be an LS1-B PCM from a late S10. Though it doesn't say 411, will it still work? I figured they were all the same anyway. I've attached a pic, it's SN 12576106.
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    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  2. #12
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    What year was it from (S10s were made until 04 IIRC) and did it have red/blue or blue/green wiring plugs? (not sure start year)-02 were 512kb LS1B aka 0411, 03-04 were 1MB LS1B.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    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.

  3. #13
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    I wanna say it was red/blue. I did see a blue/green one in a Tahoe. I'll have to check again and see, but I could swear the red/blue is why I grabbed it. Is that the smoking gun?
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  4. #14
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    Looks like this is an 03-04 PCM so 1MB? Will this be an issue once I give it a full flash?
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  5. #15
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    You wont be able to run an 02 Express Van tune in it as that is a 512kb OS not a 1MB OS. I dont know if you can full flash a 512kb OS into a 1MB PCM and have it work, not sure what would happen.

    I know that in 03, GM refreshed the Express and am 99% sure they stopped putting the 350 in them at this time. I dont think the low res crank is applicable in the 1MB PCMs for this reason.

    Might be easier to just go back and grab the red/blue PCM so you know it'll work, you could burn a VIN license on the 1MB and not be able to use it which wouldnt be ideal.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    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
    Joe (Moderator) joecar's Avatar
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    I'm told to not cross OS sizes with PCM sizes... i.e. do not flash a 512K OS into a 1M PCM.

  7. #17
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    Shooting to exchange the PCM this weekend or next. Wrapping up the cam swap/while I'm in there maintenance on the truck now.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  8. #18
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    Alright! Been driving the truck since Tuesday and just exchanged for a 411. Gonna start building a starter tune, redo the drivers in the laptop, and see if I can't get this pile off that damn piggyback with the blower. Fuckin thing won't even build boost before a downshift and it's a big block. The tune makes it rev its ass off but the motor doesn't want to. Stupid stupid stupid.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  9. #19
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    I am curious about B0101 vs B5913, i.e. the boost timing table in COS5 vs just letting the MAF handle it in the spark high octane table? Where I'm at atmoshperic is around 77kpa. I figured air was air as far as the MAF is concerned. If it's a hot day it'll draw less through and register less. If it's that hot, the IAT will bring things inline too.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  10. #20
    Joe (Moderator) joecar's Avatar
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    Yes, correct, spark table axis reference is cylair [g] which is calculated from MAF... hot air is less dense, this shows up as a lower MAF [g/s].

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