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Thread: 400 SBC Tune

  1. #1
    Carb and Points!
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    400 SBC Tune

    Greetings! I wanted to get some ecm ninja's to take a look at the Bin I am running on my 400 SBC. Runs really good but I think there may be some room for improvement. Application: 1989 5.7 wiring harness and TBI (i know i know 454 TBI would probably work better but im not made of gold). High rise intake, full headers, A/C and 3 speed T350 Transmission. All stock sensors and O2. I am running a 27fs512 chip using a Burn2 programmer. Thanks!
    16864216_10211286491051583_2331354565356162575_n.jpg
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  2. #2
    Carb and Points!
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    Any takers? I can Paypal for your time :)-

  3. #3
    Super Moderator dave w's Avatar
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    Can you post a TunerPro RT data log, .xdl file?

    dave w

  4. #4
    Carb and Points!
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    I do not have a logger setup at the moment. I plan to make my own adapter for this info. Obviously with that info would come a more precise tune, I wanted to be sure obvious parameters weren't overlooked related due to the 50 extra cubes, etc. (Heated o2 btw)

  5. #5
    Super Moderator dave w's Avatar
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    Yes, the tune will be more precise. See attached data log pics.

    dave w
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  6. #6
    Carb and Points!
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    nice, I guess I need to bust out my solder gun and attempt the home made cable..I was reading where the displacement was defined in the bin but I didnt find a reference unless it is called something completely different. I was trying to get some of the obvious snafu's.

  7. #7
    Super Moderator dave w's Avatar
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    Quote Originally Posted by wtjoker View Post
    nice, I guess I need to bust out my solder gun and attempt the home made cable..I was reading where the displacement was defined in the bin but I didnt find a reference unless it is called something completely different. I was trying to get some of the obvious snafu's.
    The displacement is a calculated with the attached Base Pulse Width (BPW) spreadsheet. I tune using spreadsheets.

    dave w
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  8. #8
    Carb and Points!
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    Awesome stuff...did you read the bin i attached, I also found a superchips that was in salvage yard 1227747 ecm that was entertaining to read, i attached it here lol btw- im almost done with this cable http://winaldl.joby.se/aldlcable.htm
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    Last edited by wtjoker; 03-15-2017 at 07:29 AM.

  9. #9
    Carb and Points!
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    Checking out your spreadsheet, it looks like I need to update this value from 135 to 156?
    1 pound per hour = 0.125997881 grams per second

    0.825 Cylinder Displacement
    6.6 Engine Displacement in Liters
    8 Number of Cylinders


    156.8771504 BPW = 1461.5 x (cyl vol / inj flow rate )

    7.685870741 Conversion lbs /hr to grams per second
    61 Injector Flow in LBS / HR

    Enter Displacement, Clinders, and Injector Flow Variables


    400.jpg

  10. #10
    Super Moderator dave w's Avatar
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    Quote Originally Posted by wtjoker View Post
    Checking out your spreadsheet, it looks like I need to update this value from 135 to 156?
    Correct.

    I use the ALDL Cable from http://www.aldlcable.com/products/aldlobd1u.asp

    dave w

  11. #11
    Carb and Points!
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    Cool. I will run this change in and see what we do. Does the injector bias value need to be changed? it is set to .40

    I have a ton of resisters, but I can't find any NPN transistors that are listed for this cable, guess ill have to go to the rat shack
    Last edited by wtjoker; 03-15-2017 at 02:15 PM.

  12. #12
    Carb and Points!
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    ok I broke down and bought that cable lol, time is money right? Is there parameters I need to adjust or set if I go to a heated 02 sensor? I get a code 13 (after going 45+ ), but the sensor is heating up and voltage is good.Could this be due to me running lean? The one wire 02 sensor didnt do this last week. Thanks again
    Last edited by wtjoker; 03-15-2017 at 06:51 PM.

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