Fat Bob dyno'd at 70HP???
Elite HDF Member
Joined: Aug 2006
Posts: 3,863
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From: Kennewick, WA
Seems like reasonable numbers from what I've read. I think the guys hitting 80 or more with just pipes and air cleaner are the exception (probably relative to the difficulty of finding good dyno operators). Never had mine dyno'd but should and if I did I would expect 80/85 hp. I have Cobra Dragsters, SE A/C and Andrews 26H cams. Really want the Fat Cat though!
Last edited by ackman1968; Jul 6, 2011 at 08:20 PM.
Outstanding HDF Member
Joined: Jun 2011
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From: Savage, MN
As I said above I am going with numbers not he said she said and I have the v&h 2 into 2 and got great numbers. Maybe mine was rare? But stage one at 85hp 99tq I thought was damn good maybe I am wrong? Read sig for exaclt parts of stage one. Not trying to start an argument but from my experience with the 2 into 2 got great results.
Advanced
Joined: Feb 2009
Posts: 58
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From: Arizona-The Valley-
I don't have any experience with the bike in this department but with my cars I found who is running the dyno makes a huge difference probably more so than the actual tune I have seen 2 different shops dyno the same car, no changes between, and come up with 2 different numbers they were close but still quite different.
That could be why the same stage one upgrade on the same motor but from bikes around the country in this thread are all pretty close but still has a good spread. After different dyno makes and weather, altitude/atmosphere adjustments and then different operators it would be impossible to get the same numbers for the same mod.
My advice take dyno numbers with a grain of salt call it a ball park figure and just enjoy the upgrade for the ride and not the numbers.
That could be why the same stage one upgrade on the same motor but from bikes around the country in this thread are all pretty close but still has a good spread. After different dyno makes and weather, altitude/atmosphere adjustments and then different operators it would be impossible to get the same numbers for the same mod.
My advice take dyno numbers with a grain of salt call it a ball park figure and just enjoy the upgrade for the ride and not the numbers.
Road Warrior
Joined: Apr 2010
Posts: 1,739
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From: Suffolk, England
I don't have any experience with the bike in this department but with my cars I found who is running the dyno makes a huge difference probably more so than the actual tune I have seen 2 different shops dyno the same car, no changes between, and come up with 2 different numbers they were close but still quite different.
That could be why the same stage one upgrade on the same motor but from bikes around the country in this thread are all pretty close but still has a good spread. After different dyno makes and weather, altitude/atmosphere adjustments and then different operators it would be impossible to get the same numbers for the same mod.
My advice take dyno numbers with a grain of salt call it a ball park figure and just enjoy the upgrade for the ride and not the numbers.
That could be why the same stage one upgrade on the same motor but from bikes around the country in this thread are all pretty close but still has a good spread. After different dyno makes and weather, altitude/atmosphere adjustments and then different operators it would be impossible to get the same numbers for the same mod.
My advice take dyno numbers with a grain of salt call it a ball park figure and just enjoy the upgrade for the ride and not the numbers.
You have to be very wary of known tuners that somehow always seem to get more out of a bike than anyone else. In my experience most of these guys have their 'finger on the scale'.
I had a few dyno pulls at a local machine when I was doing my own stage-1 tuning with a SEPST. I got around 76HP. A few weeks later I was at a show and a guy there was offering dyno pulls and tuning, so for giggles I got a dyno pull by them - 81HP. They had obviously frigged their machine to read high for the show.
Its pointless to compare bikes on different dyno machines because of this. Its only really reliable to get a pull, do your own mods and tuning and get another pull on the same machine.
Club Member
Joined: Feb 2008
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From: Passaic County, NJ
Club Member
Joined: Dec 2007
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From: Knoxville, Tn
Dyno
There are so many variables that affect a dyno run...First is the operator, then altitude, temperature, humidity (grains of water per square foot), if the dyno is indoors or outside....and the list goes on and on.
I can feel the performance of my bike get better in the winter (cold air is more dense) at lower altitude.
I can feel the performance of my bike get better in the winter (cold air is more dense) at lower altitude.
Last edited by dyna rider; Jul 6, 2011 at 07:58 AM.
Banned
Joined: Jun 2009
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As I said above I am going with numbers not he said she said and I have the v&h 2 into 2 and got great numbers. Maybe mine was rare? But stage one at 85hp 99tq I thought was damn good maybe I am wrong? Read sig for exaclt parts of stage one. Not trying to start an argument but from my experience with the 2 into 2 got great results.
It's a classic case of form over function.
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Road Master
Joined: Apr 2011
Posts: 772
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From: Corpus Christi, TX
I don't put much stock in such numbers without seeing a chart. The over-all torque curve is much more important than peak numbers. Peak numbers are pretty meaningless in the grand scheme of things.
I'd rather have a setup that can hold 80 pounds of torque across a broad range than one that peaks at 90, but has the torque coming up too late and only briefly.
I'd rather have a setup that can hold 80 pounds of torque across a broad range than one that peaks at 90, but has the torque coming up too late and only briefly.
Outstanding HDF Member
Joined: Jun 2011
Posts: 3,036
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From: Savage, MN
Agreed on the form over function not going to lie there loved the 2 into 2 look and actually did not know they were not so good with performance after the tune however I am not disappointed in the least. I will agree that there are much better pipes for performance but then again so many variables effect everything. I will have to post up my dyno sheet torque curve was awesome blasts up right away and stays high through out obviously not the case with HP gradually increases and rpms increase.
Those are great numbers and I'm not saying that good results aren't possible with big radius pipes, I'm sure they are (as you've experienced). What I'm saying is that it seems like that is not the norm. In my personal experience and what I've seen they are generally poor performing pipes compared to others out there.
It's a classic case of form over function.
It's a classic case of form over function.
Last edited by WG2011; Jul 6, 2011 at 08:56 AM.