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Thread: 454 411 Swap

  1. #111
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    I'll keep going with this thread. I recently installed 42# injectors and a 2 bar MAP on this truck. When I went to a custom operating system, I saw this one only goes up to COS3. I decided to give it a try so I didn't have to copy/paste the rest of my cal over. I'm kicking that can a little farther down the road, but I think I'm going to have to bite the bullet here at some point. There are some quirks that this PCM has that the 12212156 based one does not. Over the weekend, I got my rebuilt Whipple back on the dually and driveability right off the bat is pretty good. I need to log for knock, I'm getting some locked in OD right before PE mode hits. Just need to decide if I should pull more based on IAT or pull it from the timing map itself? I need to unload a washer and dryer before I can log or they'll end up in the middle of the road. I also appear to be running out of fuel pump, so I overnighted an AEM 340. Overkill for sure but it's a known universal fit, my truck doesn't have the bucket setup in the tank. I missed that by a year. I had to command 9.5:1 to get enough fuel under boost and duty cycles are in the low 70s. Fuel pressure is dropping from 50 to 40 psi when it should be 60+ under boost. Since the plan is to hook up a trailer and drive 1300 miles on Saturday, time is running out. I think once I sort the fuel volume and the knock, I can re-engage my tuning efforts back in MI at a much lower altitude and know for certain where I stand on injector headroom. I have a smaller pulley to put on the blower but am holding off at the moment for obvious reasons.
    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. #112
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    Quote Originally Posted by Supercharged111 View Post
    I need to log for knock, I'm getting some locked in OD right before PE mode hits. Just need to decide if I should pull more based on IAT or pull it from the timing map itself?
    Cylinder charge in that situation is very large. As it only happens just before entering PE, pulling timing should be last resort. First look at bringing in PE earlier and also look at if you really should be locked in OD for the given road speed.
    Last edited by statesman; June 25th, 2019 at 03:25 PM. Reason: typo

  3. #113
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    Definitely considered bringing in PE mode sooner, also thinking semi open loop in COS5 may be the answer here as well to give me something between closed loop and PE mode as those IATs start to build. My 1500 doesn't exhibit this and that's how it's controlled. I won't downshift any sooner though, I want all I can get out of OD before leaving it as it screams less when loaded this way and is still pulling hard, not quite to the point of no returns. I have deleted the PE timing adder and put it all in the high octane table, instances like these make me question that logic as well.
    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. #114
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    Popped an Aeromotive 340 in, massive overkill I know, but the truck instantly ran too rich for the wideband to read at WOT so I can pare back PE fueling to something more realstic, pulley down, and get some data.
    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. #115
    Joe (Moderator) joecar's Avatar
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    Sounds like you were having fuel starvation.

  6. #116
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    Yeah it was real bad. Another guy said he ran this setup on a stock pump and maybe he did. Turns out my pump was a Napa replacement, so not apples to apples like I thought. Now I have fuel for days and this truck responded way better than my 1500 to the blower in terms of throttle response, so looking like a quick calc.vet, some idle tuning, a trip to the dyno to verify its wants, and I'm set.
    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.

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