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Author Topic: DYNO Result Interpretation  (Read 1270 times)

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fxdse

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DYNO Result Interpretation
« on: November 10, 2010, 12:13:43 PM »

Please forgive as I am seeing there are lots of DYNO results and comments posted all over and I am unclear where I should ask this. Not being strong in the mechanical side of things ..... I have just recently had my 2007 FXDSE dyno'd. I had installed 259E cams, HC pistons and various other minor mods ....

The question is ... In the world of power .... Are the results indicated "good" useable power? Would the average person be happy with these results on the street? When we talk of the curve .... Is this a strong result for useable street power?

I know there are many variables but am unclear as to the "actual" meaning of these results.
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Unbalanced

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Re: DYNO Result Interpretation
« Reply #1 on: November 10, 2010, 12:20:52 PM »

Several questions were there any runs done after the 6th one posted here for your wide open throttle?  that is about the easiest thing for them to tune.   Where do you ride the bike the most rpm range?   This bike does not really come on until 3300 rpm where you break 100 torque and lasts about 2200 rpm to 5500 rpm.

I would be more concerned with rideability of the tune which should take approx 35 - 50 runs to truly be sure it is right for your bike if done by a competent tuner.

Personally I want more torque lower in the rpm range where i typically ride say 2300-3500 rpm range vs. 3300-5500 while it is nice to be able to twist and go most of my ride time prollly 90 precent is spent under 3200 rpm.   This is all subjective on the way you ride and where you want your power. 

Your numbers are ok for no headwork but most guys are getting in the area of 115 tq and 105 hp with just pipes / air cleaner and tune.  There is more to be found in that motor, but you may give up some of the reliability getting there.   


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fxdse

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Re: DYNO Result Interpretation
« Reply #2 on: November 10, 2010, 12:31:47 PM »

I do not have any of the other runs. Just this one. I do know and trust that he is a very capable and compitent tuner. I had the stock 110 and as the winter is starting to hit, I had asked him to do "something" for me as I trust in his capabilities. He put together what he felt was a "good" combination and has logged about 350km with numerous trips to the dyno to fine tune.

So .. the bike is being delivered this week end and all I have right now is the dyno sheet. I was a little concerned as like you, I ride in that 2500 - 3000 range day to day. I am open to suggesting he change things but I guess I was unclear if I would "really" not be able to notice anything different until 4000rpm? So the initial pull up to 4000 (from what is indicated) is really no difference from stock so unless I ride up there should really feel no difference?
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HD Street Performance

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Re: DYNO Result Interpretation
« Reply #3 on: November 10, 2010, 12:36:05 PM »

How does it feel to you compared to before the upgrade
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fxdse

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Re: DYNO Result Interpretation
« Reply #4 on: November 10, 2010, 12:41:01 PM »

I won't know until tomorrow .... just have the specs at this point and was looking for some opinions. I know ... it's opinions, but not being experienced with dyno sheets and what they mean ..... was just wondering what I might expect or fear that it's back to the shop.
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Unbalanced

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Re: DYNO Result Interpretation
« Reply #5 on: November 10, 2010, 12:58:37 PM »

I expect that the 255 cams stock would be about 15- 20 torque higher down low and this is enough to be noticed by the butt dyno.  You have a lighter bike, but in the end you have to be the one that is happy.   I would want to know how many pulls were done to tune my bike though in total of the run files.

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Talon

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Re: DYNO Result Interpretation
« Reply #6 on: November 10, 2010, 01:25:40 PM »

People post all kinds of dyno results, many getting excited about their peak power numbers. Well a couple of things, first dyno results can be a bit of smoke and mirrors! Secondly, to me the main thing is to get good power in the range you ride in 90% of the time, like unbalanced said then his post. Most people probably ride in the 2500-4000 rpm range most of the time, or at least I do, so while the peak HP and TQ above that is fun for showing off it's not as important as your true riding range.
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fxdse

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Re: DYNO Result Interpretation
« Reply #7 on: November 10, 2010, 02:29:01 PM »

I appreciate the responses and it does seam to be unanumous. I'm not sure how much I will get to really test it before the real cold weather hits but am going to try it out this weekend. I am in fact leary where the peak currently sits but I'm hoping it will still "rock" over all? IF I am not happy or it just plain bugs me ... :-) Figure I could try a new cam combination without sacrificing the other parts that went is? and is there any "suggestions" for what cam might keep the peak numbers but bring the peak lower into the rpm range most ride?

Again ... really appreciate the constructive feedback.
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HD Street Performance

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Re: DYNO Result Interpretation
« Reply #8 on: November 10, 2010, 02:40:26 PM »

I would not really offer much of an opinion, what we see is a snapshot of what the bike does on a dyno at WOT. On the road it may have a very good feel to you as compared to stock or maybe not. All will depend on how you ride, your typical payload, and where you shift. We have no database of SE259 builds to speak of to really draw from as far as "normal" good bad or otherwise. Not many have landed on these forums and fewer in the 110 motor. The FXD is light and you will likely not miss the slight hit down low, off idle to 2.5K.
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fxdse

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Re: DYNO Result Interpretation
« Reply #9 on: November 10, 2010, 05:01:03 PM »

Thats what I was hoping. I would not consider myself an agressive rider and do usually shift and ride the bike around that 3000rpm mark. However, I am maticulous and keep my bike in prestine conditionas well like to know that it is in top performance. I had 21000km and had them check crank runout. I though at that time ... what the hell, lets beef it up a bit. So we did. They say it performs great and I was very clear on my riding but thats when I noticed this data sheet they gave me and was a little taken back where the peaks were? But the curve seamed strong and I was wondering if that meant I will experience smooth, strong pull from the start all the way up?

I love the 110, never experienced "heat" related problems, never had issues with leaky head gaskets and it's always been a strong engine. Longest tour was from Calgary to Phoenix and back. I said with the mods I still wanted to be able to do that kind of riding.

I will post my thoughts again after riding with the new modifications.
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