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Thread: Base Tune or close to spec tune for 0411 SBC406AFR-HSR

  1. #16
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    Evilstuie,

    I may have some time over the holidays to try bench flashing a PCM with your COS tune. This would then be a little easier to make changes to your tune.

    So far I believe that you are running a 406 SBC with 24x / 1x setup, using 8 LS coils, a 4L60E transmission, 2.77 gears (or 2.73 ?), and 225/60-15 tires.

    Need some additional information to try and get you a little better "start-up" tune.

    Questions:

    • Fuel rail - return style or returnless style ?
    • Fuel injectors - from what ? (part number is the best, if you can read if from the OEM injector)
    • MAF - Yes or No ? (if yes, from what ?)
    • Knock sensor - one or two ? (from what vehicle, and how are these setup ?)
    • Transmission mounted Gear Position Switch - Yes or No ?
    • Electric fans - Yes or No ? (if yes, one or two ?)
    • Thermostat - 180 F or 192 F ?

    If you are not using a MAF, you will still need to use an Intake Air Temperature (IAT) sensor.

    Looks like your camshaft has a 110 degree lobe separation angle, which is not PCM friendly at all. Comps Cams comments for your camshaft - "Computer-Controlled Compatible: No".

    Typically with an automatic transmission, the minimum advisable lobe separation angle would be 114 degrees. Fine tuning the idle with that camshaft is going to break your heart (and maybe your wallet !).

    No promises, but I will try and get you something a little closer.

  2. #17
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    Thanks so much for that!!!
    I'm in Melbourne for another 2 days, but I know most of the details.
    No MAF
    Return style rail
    One knock sensor on left side of motor, TPI 350 style
    Trans - no gear selector mounted
    Dual fans, but wired for single trigger, 180F thermostat
    Injectors from memory are 28lbs LS1 injectors
    As soon as I'm back I can get the numbers off the injectors.
    Thanks so much for this :)
    Last edited by evilstuie; 12-25-2016 at 12:05 AM.

  3. #18
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    Hey LRT, The injectors are 28lbs LS1 injectors - part# 12561462Let me know if you need any other info :)

  4. #19
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    Thank you.

    Couple of questions:
    - is the Fuel Pressure Regulator set to 58 PSI, and vacuum referenced to the intake manifold ?
    - 2.73 or 2.77 gears ?

  5. #20
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    Yes, set to 58psi, with the vacuum attached and 2.77 gears.

  6. #21
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    Thank you ... back home in a couple of days ... just need to bench flash the PCM, then will post a tune for you to try

  7. #22
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    Awesome! Thanks so much for this :)

  8. #23
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    Evilstuie,

    I posted in the other thread, where you are working on debricking two PCMs

    You are currently using a COS 3 calibration based on 12225074. I have a BIN for you to try, that should be better suited to a SBC.

    However, if you are able to flash the initial calibration directly to the chip, then the "best" tuning solution for you is a COS 1 based on 12202088. As you are MAFless, without using a COS, the PCM will default to the low octane spark table. Using a COS 1 will let you use the XDF for 12202088 - once again making tuning DIY, using TunerPro.

    As I stated in the other thread, I will get to work on this now ... because I know that you will be successful !

  9. #24
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    OK ... this BIN is an LS1 / L31 hybrid.

    It is setup for a single knock sensor, and should be more SBC friendly.

    The fan to set to turn on at 193F, and to turn back off gain at 188F - given your 180F thermostat. If your cooling system can keep up (i.e. actually cool to 180F while stationary) these could be set slightly lower, if you wanted.

    The Tach is setup for an 8 cylinder output.

    All the parameters that you posted / described have been incorporated.

    As it is a COS 3, it may run a little rich until the engine is at operating temperature - this can be leaned out, if you have a wideband oxygen sensor available to determine exactly how rich it is running.

    What we should be able to accomplish with the vehicle stationary in your garage, is to get the cranking airflow and idle airflow a little closer.

    If you have to step on the accelerator pedal to get it to start, or to start more quickly, then it needs more cranking airflow.

    Let me know what changes you would like to try - I have this flashed into a PCM on the bench, and can make changes quickly.

  10. #25
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    Hey LRT,Its a lot better than before! :)
    It idles a bit rough, but without any throttle which is awesome.
    I still need to give it a little throttle on ignition, so maybe a little more cranking air as you mentioned.
    The scanner rpm doesn't match the gauges, but i can calibrate the gauges later when I get the software.I had enough time to check the alternator is working correctly 14.4V output, and to see that my thermo fans are not triggering properly.
    What pin on the PCM outputs the signal to the relay? and is it 12v or GND trigger?
    The temp got to 102C before I turned it off. I'm also running 8qt of oil in there for run in, so i could really rev it past 2000, but so far so good.
    Cheers,
    Stu

  11. #26
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    Oh, and there's a P0102 code

  12. #27
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    A single cooling fan will be operated by the Fan 1 (Low Fan) driver. The PCM grounds the low power side of the Fan Relay to activate the cooling fan. This ground wire should be connected to PCM C1 (Blue) pin 42.

    Attached is the next BIN to try. The Tach output has been put back to 4 cylinder mode (which is what it was previously), so hopefully that works with your Tach.

    To ensure that the PCM immediately fails the MAF (even though no MAF is connected) and defaults to Speed Density (SD) Mode, the MAF DTCs (P0101, P0102, P0103) have been set to trigger immediately. These should not turn on the MIL (Check Engine light), but will be set if checking with a diagnostic scanner. Once we make some progress, we could then try setting these to a lower level of urgency.

    The attached BIN has a little more Cranking Airflow and Spark, and a little more Idle Airflow.

    Once the engine is at operating temperature, check the approximate Idle RPM and Spark Advance, and let know these values.

  13. #28
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    This one starts easier but doesn't idle on its own.It always takes me 2 attempts to start it so i think i have the distributor on TDC intake instead of exhaust, but second attempt starts almost instantly so cranking settings seem to be good.

  14. #29
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    Haha - did not see that coming !

    Please check the distributor orientation - we will go in circles, if it is not correct.

    The "start on the second attempt" could also be fuel pressure related - sometimes the rail pressure will leak down after sitting for a bit. Try cycling the key on and off a few times, before cranking, to ensure the fuel rail is full and at pressure.

    The attached BIN is about halfway between Trial 1 and Trial 2.

  15. #30
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    Hey mate,
    Sorry for the delay getting back to you, new years wiped me out for a day.
    This one is much better, I also found it helps to have PIN42 on the harness to trigger the thermo fans. I think the commodores use the bcm to trigger the fans maybe.
    The idle was much better, it feels a bit rough, but maybe that's the cam, I have no point of refernece, but it was sitting between 620-750rpm without feeling like it was going to cut out which is good, and with the harness pinned with a wire at Blue-42 it triggered at 89.5C so all is looking good.
    I've got a bit of smoke coming from the engine I have to investigate and see whether its just oil sputting out the breather because there's too much, or a small leak somewhere, but I think with this tune it's good enough to fault-find and run the motor in properly to take another oil sample and make sure everything's good with it before either taking to the tuning shop, or giving COS1 a go :)
    Are you able to post the COS1 when you have the time and I can start learning the tuning process with TunerPro while I wait for the chip adapters to get here :)
    Thanks again so much for your help, it's a fantastic feeling to be able to just sit in the car and idle :)
    This is the car by the way:

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