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Thread: Too much timing being pulled on N2O COS5

  1. #1

    Default Too much timing being pulled on N2O COS5

    Total timing is 28*, for nitrous activation its pulling 18* for a total timing of 10* for nitrous. But its actually pulling 20.5*, running total timing of 7.5* with the nitrous activated.
    Vehicle is a 2000 Chevy Ext cab truck with a 370, L92 heads, 251/267 .623 115+6, Vic Jr intake, Fast 4150 TB, NOS crossbar plate with a .060 jet. SD tune, no maf, no o2's.

    Here is the Tune and Log.

    370 .060 7.5 DEGREES TIMING IN TRUCK NOW 4 7 12.tun
    7.5 DEGREES NITROUS.efi

  2. #2
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    One thing I've found is you need to have all the tables matched. So high octane, low octane, spark in gear, spark in park, and optimal timing all have to be equal to have the exact timing you want when using the cos timing functions. So just take a little time and closely match the cell values and you should get the result you want.
    LQ4, Pro-Flo, heads, Stock48 cam'd, twin TO4E 2001 C5 830rwhp/905rwtq
    2001 GMC RCSB pt88/5.3/4l80e/14 bolt 11.34@123.2 best pass so far with a 1,82 60' @ 13lbs boost

  3. #3

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    Quote Originally Posted by joeygc5 View Post
    One thing I've found is you need to have all the tables matched. So high octane, low octane, spark in gear, spark in park, and optimal timing all have to be equal to have the exact timing you want when using the cos timing functions. So just take a little time and closely match the cell values and you should get the result you want.
    Got everything copied and matched. Will try it out tomorrow. Thanks!

  4. #4
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    Oh and lower B6619 and B6620 by 1-5 to get them back in range. Whats with the throttle position only showing 87.5-88%?
    LQ4, Pro-Flo, heads, Stock48 cam'd, twin TO4E 2001 C5 830rwhp/905rwtq
    2001 GMC RCSB pt88/5.3/4l80e/14 bolt 11.34@123.2 best pass so far with a 1,82 60' @ 13lbs boost

  5. #5

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    Quote Originally Posted by joeygc5 View Post
    Oh and lower B6619 and B6620 by 1-5 to get them back in range. Whats with the throttle position only showing 87.5-88%?
    cant really getthe tps right.. Im on my 3rd tps sensor.. and still reads like that and ive tried to re clock it in the throttle body.

  6. #6
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    Ah hell, give phantom a rubber mallet

  7. #7

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    Quote Originally Posted by joeygc5 View Post
    Ah hell, give phantom a rubber mallet
    I'm thinking something bigger than a rubber mallet.. Lol

  8. #8
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    Any time to test it out?
    LQ4, Pro-Flo, heads, Stock48 cam'd, twin TO4E 2001 C5 830rwhp/905rwtq
    2001 GMC RCSB pt88/5.3/4l80e/14 bolt 11.34@123.2 best pass so far with a 1,82 60' @ 13lbs boost

  9. #9

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    Yea I tried it last night. Had it commanded to run 7.5 degrees and it ran 5 degrees. Ill post the tune and log tonight when I get home.. In kinda wondering if it has something to do with the TPS not reading right..

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