Post missing
This post could not be recovered from the original forum.
Posted dyno - power question
21 posts · Started by Zaq · 15 Aug 2007
Post 2 by Spyder,
#2Post missing
This post could not be recovered from the original forum.
Post 3 by rog,
#3Post missing
This post could not be recovered from the original forum.
Post 4 by lockers,
#4Break in makes a 3 to 5hp difference.
Post 5 by Dr F,
#5Post missing
This post could not be recovered from the original forum.
Post 6 by Zaq,
#6Holy moly Zaq! It looks like an epileptic ran riot with a crayon set! I'm with lockers, you need a PC/Tuneboy to get those lines smoothed out. The A/F is terrible, that line should be arrow straight, I can see why your not happy with the power, but at least you can see the reason why.
Post 7 by Dr F,
#7Post missing
This post could not be recovered from the original forum.
Post 8 by Dr F,
#8Well I can honestly say my dealer never has mentioned anything about warranty. They seem like some good eggs and I don't think they would leave me hanging.
But as far as the power goes, the air/fuel mixture I know is a bit wavy, but should it not produce good power in the places it's spot on? The torgue curve is relatively flat, except for the minor dip around 6500. If the air/fuel is the cause of the low power, would not the dips in power follow the air/fuel curve?
Also Lockers, I do have a PC3 on it, and the graph is after it was tuned. The dude was shooting for like 13.8 mixture for some reason. Is that what Harley's shoot for? This dealer is mainly a Harley dealer.
Also, I think they had an issue with lag in the oxygen sensors they used. When I look at my PC3 fuel map it looks like a friggin saw-tooth pattern. I think it was too rich, then too lean, and the tuner did not let the sensor stabilize at each tweak - so it oscillated back and forth as he went up the RPM range.
I manually smoothed out the map, but I have not lugged down my computer to load it yet. Also, he did a basic map, not each cyclinder individually.
I guess I need to find a better dyno place. <Sigh>
Zaq
But as far as the power goes, the air/fuel mixture I know is a bit wavy, but should it not produce good power in the places it's spot on? The torgue curve is relatively flat, except for the minor dip around 6500. If the air/fuel is the cause of the low power, would not the dips in power follow the air/fuel curve?
Also Lockers, I do have a PC3 on it, and the graph is after it was tuned. The dude was shooting for like 13.8 mixture for some reason. Is that what Harley's shoot for? This dealer is mainly a Harley dealer.
Also, I think they had an issue with lag in the oxygen sensors they used. When I look at my PC3 fuel map it looks like a friggin saw-tooth pattern. I think it was too rich, then too lean, and the tuner did not let the sensor stabilize at each tweak - so it oscillated back and forth as he went up the RPM range.
I manually smoothed out the map, but I have not lugged down my computer to load it yet. Also, he did a basic map, not each cyclinder individually.
I guess I need to find a better dyno place. <Sigh>
Zaq
Post 9 by Plipton,
#9Jeezus man I tried to tell you when you got the bike, your going to need to take it to a qualified shop, that may involve some driving.
I've seen a bunch of SD dyno charts, never one like that.
I've seen a bunch of SD dyno charts, never one like that.
Post 10 by lockers,
#10I think Stevie Wonder should stick to singing and leave the Dyno shop to people who know what they're doing. This is my A/F graph, this is also a single map, I havn't got round to having the indevidual cylinders mapped yet, so don't let anyone give you that BS excuse. There are no reasons why yours should not look like this.
The initial fluctuation at 3-4k rpm, is just the dyno operator getting on the gas.
The initial fluctuation at 3-4k rpm, is just the dyno operator getting on the gas.
Post 11 by Zaq,
#11Post missing
This post could not be recovered from the original forum.
Post 12 by lockers,
#12Post missing
This post could not be recovered from the original forum.
Post 13 by Black Mamba,
#13Post missing
This post could not be recovered from the original forum.
Post 14 by Black Mamba,
#14Post missing
This post could not be recovered from the original forum.
Post 15 by Chris,
#15Post missing
This post could not be recovered from the original forum.
Post 16 by Zaq,
#16Post missing
This post could not be recovered from the original forum.
Post 17 by Black Mamba,
#17Post missing
This post could not be recovered from the original forum.
Post 18 by Black Mamba,
#18Post missing
This post could not be recovered from the original forum.
Post 19 by Black Mamba,
#19Post missing
This post could not be recovered from the original forum.
Post 20 by Black Mamba,
#20Post missing
This post could not be recovered from the original forum.
Post 21 by Black Mamba,
#21Post missing
This post could not be recovered from the original forum.
End of archived topic · Posting is closedBack to top ↑
← Back to Technical - Dr F's Words of Wisdom