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08 Nightster pinging - mapping help
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08 Nightster pinging - mapping help
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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
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
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
5 years ago
The almighty dyno sheet;
tussuck
5 years ago
amazing what a tweak to timing does.
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