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Thread: Dyno numbers and problems

  1. 06-20-2005 06:58 AM #1
    white1
    white1 is offline Senior Member
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    Went and got my truck dynoed Sat.
    1st pull= HP 254.22 TQ 259.79
    2nd pull= HP 236.30 TQ 250.32
    Also the curves had a few bobbles in them, not smooth like all the other LS1 cars out there. But I figured that may just be because it was a truck. I would like to find my 20hp I lost on the second pull.

    Then on the way home, I noticed a horrible miss. Worst around 2000rpm while slowly acellerating. WTF?? I thought it may be a tune problem, so I swapped my stock PCM back in, but it actually seemed worse with it. So I swapped my tuned PCM back in, and it got better till after about 150 miles. My plugs looked white to me, but I just put them in Thursday, so I don't know. Not real familiar with these motors, need help please.
    2000 RCSB Z-71 6l swap 12.8 Gone but not forgotten


    2008 CCSB "tow truck" Slooowwww
    1999 RCSB "WRK TRK" 4.late but getting there.
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  2. 06-20-2005 12:31 PM #2
    chrisj6
    chrisj6 is offline Senior Member
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    I'm not sure what the deal is....who does your tune right now? My torque/hp curves were perfect, torque was totally flat! So I know its not just because its a truck.

    Chris
    2009 Silverado, HPTuners, all stock.
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  3. 06-20-2005 04:24 PM #3
    Hit Man X
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    Cam timed properly? Knock Retard?
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

     '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
    Let's face it, the red hair... makes 'em wet.
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  4. 06-20-2005 06:34 PM #4
    white1
    white1 is offline Senior Member
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    Well I guess I can't lie. I didn't degree my cam. I bought it used. It pulls real hard, but when I dynoed it, they did two back to back pulls. The second one was 18 hp less Then when I left, I noticed a low rpm miss while under a load. Now it feels like its pulling timing in the upper rpms 4000-5000. I'm going to put it on the scanner ang get it retuned when I can, just was hoping to hear an easy fix. I also swapped plugs, and it seemed to clear up for a little bit, but then came right back. I also tried swapping the stock PCM back in, but it seemed worse with it.
    2000 RCSB Z-71 6l swap 12.8 Gone but not forgotten


    2008 CCSB "tow truck" Slooowwww
    1999 RCSB "WRK TRK" 4.late but getting there.
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  5. 06-20-2005 06:52 PM #5
    Hit Man X
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    Mess up a plug wire... such as pull a connector from a boot? I did, ran like ass.
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

     '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
    Let's face it, the red hair... makes 'em wet.
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  6. 06-20-2005 09:11 PM #6
    white1
    white1 is offline Senior Member
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    Yea, I checked that at the track. No luck. I pulled my valve covers tonight and found a few pushrods I wasn't happy with. Cleaned them, and it seemed to make a word of difference. That rough idle caused by "the cam" was gone, and the low rpm miss seems to have left too. It still pops under load at high rpm, but I thibnk thats because I put my fouled iridiums back in. Hopefully they will clean theirselves?
    2000 RCSB Z-71 6l swap 12.8 Gone but not forgotten


    2008 CCSB "tow truck" Slooowwww
    1999 RCSB "WRK TRK" 4.late but getting there.
    Reply With Quote Reply With Quote
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