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08 Nightster pinging - mapping help

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  • tussuck
    tussuck
    5 years ago
    So whats the CR?  Is it 9.75:1 or 10.25:1?  (whats the 'corrected' mean in the CR ratios provided)
    I ask because that cam is a about a 10:1 stage 1 cam best suited for Stock compression.  
    And should'nt that setup be making 95ish HP?
  • night_prowler
    night_prowler
    5 years ago
    Hey Tussack, check this out, keeping in mind this is before the recent dyno tune. 


    And Kinkade, it’s got a 58t rear, gotta check the front, but the guys reckon it’s geared pretty short, it feels like it accelerates pretty quick but really I don’t have anything to go by because I’ve never ridden stock gearing on a sportster bar a quick test ride around Springwood on a forty eight last year but it to me it feels tall, it’ll hum along nicely at about 130-140 no worries. 

    Between the 570 jackhammer cam and the gearing it feels like it wants to be up in the mid to high rpms but I still don’t think it should be pinging like it does in the heat. Ive had a few people say “sportsters need to be revved! Don’t try and ride it like a big twin!” but i utilise the RPM’s and always try keep it in the fat part of the torque. 
  • night_prowler
    night_prowler
    5 years ago
    For all ye who may be interested; 
    Another dyno run done last week, they adjusted the timing by 2 degrees and it is absolutely flying, rides amazingly and zero pinging even in the Gold Coast traffic at about 35 degrees splitting through the traffic at a snails pace. 

    They uncovered some more fuckery with my real wheel though so the drama continues. Treating it more as a project now, I seem to uncover new problems on a weekly basis. 
  • night_prowler
    night_prowler
    5 years ago
    The almighty dyno sheet; 

  • tussuck
    tussuck
    5 years ago
    amazing what a tweak to timing does.
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