Need Comments on a dyno run
Club Member
Joined: Feb 2007
Posts: 16,320
Likes: 306
From: Boynton Beach, FloriDuh
It's not often that a dyno tune results in a loss of both torque and HP.
It looks to me like Red was the baseline (check date & time of the pulls).
It looks to me like Red was the baseline (check date & time of the pulls).
Last edited by cHarley; Mar 16, 2012 at 07:56 AM.
Says right on the file that the red is the D&D 2-1 baseline and the blue is the tune.
The smoothing is pretty low so all of the lines will appear choppy. I personally prefer to see that rather than have the smoothing set on 90 so it looks all pretty. Just my personal preference though.
What matters is the area under the curve (TQ). As long as you are improving that you are bound to be happy(ish).
How does it run now compared to before?
The smoothing is pretty low so all of the lines will appear choppy. I personally prefer to see that rather than have the smoothing set on 90 so it looks all pretty. Just my personal preference though.
What matters is the area under the curve (TQ). As long as you are improving that you are bound to be happy(ish).
How does it run now compared to before?
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Road Master
Joined: Oct 2010
Posts: 958
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From: Hartford, WI
It seems to run without the hesitation or the strangulated feeling.
What I am worried about is the AFR bouncing from 2500 rpm to 2600 and back up to 4000 and then settle by 5000
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* There are many, many people here far more experienced with H-D's than me. I do not claim to be any sort of an expert with these bikes, or anything mechanical to begin with. My dynamometer experience comes from the automotive racing world and my tuning ability is limited though I understand more than the average person. With that said:
It appears to be a shifted and smoothed out version of stock tuning with a richer run up top. I don't see a point myself where you are having a "serious" issue with AFR.
I'm assuming you haven't changed anything else but the pipe? 2-1's will shift the curve upward in the RPM range, which I also prefer, though some folks love to have their TQ as low in the range as possible.
It appears to be a shifted and smoothed out version of stock tuning with a richer run up top. I don't see a point myself where you are having a "serious" issue with AFR.
I'm assuming you haven't changed anything else but the pipe? 2-1's will shift the curve upward in the RPM range, which I also prefer, though some folks love to have their TQ as low in the range as possible.
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Road Master
Joined: Jul 2006
Posts: 1,132
Likes: 1
From: MO
Seems extremely lean to me in the midrange there, looks to have an effect on performance too? Trouble going open loop? Curious myself. These typical 883 numbers? You got some of the best numbers producing parts on there, but they seem a little low to me.
Last edited by Jackal; Mar 16, 2012 at 08:54 AM.
Club Member
Joined: Feb 2007
Posts: 16,320
Likes: 306
From: Boynton Beach, FloriDuh
I don't see any mention of a tuner being installed on the bike. What was done between the baseline and final run, a stage 1 remap? With a decent tuner, you should be able to improve the swings in the A/F ratio in the midrange.