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    Minimal test bench?

    Does anyone know what the minimal config is to get the body module, dash, and ecm up and running together, networked via CAN? I'm wondering if I had those three on my bench, connected power and...
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    Duplicating my ECM onto a fresh, blank one

    Rather than risking bricking my factory ECM (2015 Corvette Z06 A8) I was thinking I'd grab a spare PCM for $165 from RockAuto and then copy my virgin factory tune over to it. A couple of things I...
  3. Can anyone explain the difference between the two Vehicle Speed Output sections?

    I'm trying to figure out the difference between the two speed sensor settings in HPTuners as I try to assist someone in getting a speedometer to work with an LS3-6L90E combo.

    Under Hardware, it...
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    Heads and cam, closed loop. No logs handy, all I...

    Heads and cam, closed loop. No logs handy, all I know is it's very lean on light throttle cruise.
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    Noob question on lean cruise

    As I work my way through the tuning FAQs, I'm hoping someone can gently answer a basic question for me.

    On the LS7 where should I be looking to adjust the AFR for steady state, light-throttle...
  6. Input needs to be pulled one direction or the...

    Input needs to be pulled one direction or the other as a reference, don't they? I'm a software guy so be gentle.

    Outputs either have the ground path needed to complete the relay's magnet circuit...
  7. Thanks - it was the output I was wondering about...

    Thanks - it was the output I was wondering about (fan specifically) and from your description they just let them float, rather than tying them high when off for example.
  8. Are ECM outputs floating or tied high when they're not active?

    For things like the fan relay triggers - do they float or are they +12V when not active?

    I don't have a single modern ECM running at the moment, everything in boxes, or I'd just go measure one!
    ...
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    Thanks. Based on the foregoing, here's what I...

    Thanks. Based on the foregoing, here's what I think I know.

    I set the fans to discrete, since I'm relay based on not solid-state (PWM would just buzz my relays). I set it to 2 fans.

    I then...
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    Almost clear... but what are those percentages a...

    Almost clear... but what are those percentages a percentage OF? Maximum cooling capacity? Or are they just a convention that maps a desired % to a fan state?

    I do need to make sure that it's...
  11. What causes a throttle to close and reopen during a dyno run?

    I was watching a dyno run of a modified LS7 (on an engine dyno, not chassis) and the throttle was closing itself about half way and reopening around 4500rpm. I couldn't hang out to find the cause,...
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    Can someone explain the fan states?

    I'm trying to re-enable discrete control of 2 fans in the eRod LS3 ecm. I've done the hardware side of splitting out the fan control wires (which ship hooked up to the same relay). I know there are...
  13. Looking at the LS3 E67 config I see only Prime...

    Looking at the LS3 E67 config I see only Prime Time, nothing in terms of when priming should happen or not.
  14. Anyone? I do need to set this - I ordered the...

    Anyone? I do need to set this - I ordered the eRod automatic calibration even though I'm running a TKO because I knew I had to change this anyway, but I need to know why they're different before I...
  15. Thread: Need a LS3 tune

    by davepl
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    I have a stock LS3 eRod tune in manual and...

    I have a stock LS3 eRod tune in manual and automatic. If that's useful, and if we're allowed to post them, have a mod confirm that and I'll post it. I have no idea what the copyright issues are...
  16. Two different VSS entries - what do they mean?

    Under Speedo in my LS3/E67 I see two entries:

    VSS Pulses Per Rev: 40
    VSS P/Rev Trans : 36

    They sound the same as do the status bar tips. And yet the value are different. So, two questions:
    ...
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    I suppose just as there are faces made for Radio...

    I suppose just as there are faces made for Radio there are personalities made for the Internet.

    But I digress. Pannetron, yes, when you open the fuse box (disconnect the input lugs, then it...
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    I found the info on LS1Tech.com, cut the wires,...

    I found the info on LS1Tech.com, cut the wires, toned them out, found them at the expected cavities on the ECM connectors.

    While I was waiting I built a three-relay circuit that will run the two...
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    I was having trouble -finding- documentation, not...

    I was having trouble -finding- documentation, not understanding it. Pointing me at the GMPP catalog was condescending and not helpful by any measure. The word "pinout" does not appear in the PDF...
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    The only pinouts and schematics I've found so far...

    The only pinouts and schematics I've found so far are for a Trailblazer, which uses a single fan. No luck finding a dual-fan pinout E67 schematic yet (not for lack of trying, but I might not be...
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    Thanks very much! I pulled it part and found the...

    Thanks very much! I pulled it part and found the two wires (green and blue). Just to confirm:

    a) Those are the two individual fan wires coming from the ECM?
    b) I should be able to cut them and...
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    From the E38 pinouts (but is that the same as the...

    From the E38 pinouts (but is that the same as the eRod???):

    High Speed Fan - Pin 17, D-BU/WT
    Low Speed Fan - Pin 58, D-GN

    Are these switched ground? Would I be safe using them to ground a...
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    eRod Fan Harness

    I'm setting up a GM eRod and am unhappy with the prospect of running my dual Spal fans as one big unit.

    They only give you one fan control wire which is a bit odd. I'm hoping someone knows the...
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    eRod Fan Harness

    [Wrong Forum - Sorry, I can't see how to delete]

    I am honestly not up to speed on controller versions, though I presume it to be an E38 - the part number is 19257231. It's the controller that...
  25. Thread: Fuel Level

    by davepl
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    Have you tried just grouding the old sensor (if...

    Have you tried just grouding the old sensor (if that's how it works, I don't have a wiring diagram)? On older 90-ohm vehicle sensors that would fake it into a "FULL" state and so you'd have no...
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