SE Stage IV 131 kit engine & dyno testing 2020 FLTRXS
Club Member
Joined: Aug 2017
Posts: 570
Likes: 43
From: Coal grove ohio 45638
Wow that is amazing! I have the all Harley version of the 131 and it made 120/132. It's good to know there is another 30+ HP and 25 ft lbs. of torque in easy reach. I'm curious have you done any tunes on a 131 with just a pipe and tuner swap leaving the SE517 cam? Thanks for all of your great info.
I get that.
I understand Fuel Moto was displaying their results on a similar build which were obviously excellent.
I included Fuel Moto to get insight on the build Jetro was showing us.
He used an aftermarket cam and an excellent exhaust but his Dyno results were less then I would have expected.
@fuelmoto misinterpreted my question which was not aimed at their dyno but Jetro's dyno.
I did a similar SE 131 Kit, fullsac header etc. with similar results to Fuel moto.
So I wondered what was holding the power back on Jetro's build? Milder cam, tuner?
In hindsight I wasn't perfectly clear with my question.
I understand Fuel Moto was displaying their results on a similar build which were obviously excellent.
I included Fuel Moto to get insight on the build Jetro was showing us.
He used an aftermarket cam and an excellent exhaust but his Dyno results were less then I would have expected.
@fuelmoto misinterpreted my question which was not aimed at their dyno but Jetro's dyno.
I did a similar SE 131 Kit, fullsac header etc. with similar results to Fuel moto.
So I wondered what was holding the power back on Jetro's build? Milder cam, tuner?
In hindsight I wasn't perfectly clear with my question.
With that being said there are a couple things that stand out on the chart you a referencing, while a WOT dyno chart is only a small representation of the tune overall you can see the AF is clearly leaner than optimal (the power curve follows the fuel) so that brings the overall tune info question, and peak #s wise the WM8-22XE is short on lift/duration for the 131" compared to some of the larger cam builds that break 140's or better. I would expect a well tuned SE 131 with a WM8-22XE to make in the 140Hp/150+Tq range with the power biased towards the left side of the curve.
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Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
Road Captain
Joined: May 2021
Posts: 504
Likes: 271
From: Anywhere, USA
Wow that is amazing! I have the all Harley version of the 131 and it made 120/132. It's good to know there is another 30+ HP and 25 ft lbs. of torque in easy reach. I'm curious have you done any tunes on a 131 with just a pipe and tuner swap leaving the SE517 cam? Thanks for all of your great info.
Aside from labor that's a fairly cheap upgrade. Btw with the Cat in the head pipe gone, my bike runs so cool it is ridiculous.
You can grab the slip-ons immediately after riding.
This may help: Who Has Done A SE 131 Kit Dyno'd, Hp results? - Harley Davidson Forums (hdforums.com)
Wow that is amazing! I have the all Harley version of the 131 and it made 120/132. It's good to know there is another 30+ HP and 25 ft lbs. of torque in easy reach. I'm curious have you done any tunes on a 131 with just a pipe and tuner swap leaving the SE517 cam? Thanks for all of your great info.
Road Captain
Joined: May 2021
Posts: 504
Likes: 271
From: Anywhere, USA
No worries, I generally hold my opinion on charts shared by others as there is so much that is relative; conditions, test procedures, different components & tuning, etc.. and that leaves so much open to interpretation. Sometimes low numbers are as simple dyno runs performed at higher than optimal engine temps and the engine gets into spark/temp correction, insufficient make up air in the dyno cell, or the runs were made in a lower gear. This doesn't necessarily mean there is anything wrong, its simply a relative comparison to testing made under different conditions.
With that being said there are a couple things that stand out on the chart you a referencing, while a WOT dyno chart is only a small representation of the tune overall you can see the AF is clearly leaner than optimal (the power curve follows the fuel) so that brings the overall tune info question, and peak #s wise the WM8-22XE is short on lift/duration for the 131" compared to some of the larger cam builds that break 140's or better. I would expect a well tuned SE 131 with a WM8-22XE to make in the 140Hp/150+Tq range with the power biased towards the left side of the curve.
With that being said there are a couple things that stand out on the chart you a referencing, while a WOT dyno chart is only a small representation of the tune overall you can see the AF is clearly leaner than optimal (the power curve follows the fuel) so that brings the overall tune info question, and peak #s wise the WM8-22XE is short on lift/duration for the 131" compared to some of the larger cam builds that break 140's or better. I would expect a well tuned SE 131 with a WM8-22XE to make in the 140Hp/150+Tq range with the power biased towards the left side of the curve.
A simple performance cam kit and exhaust and 140-150hp is easily obtainable on your 131.
Aside from labor that's a fairly cheap upgrade. Btw with the Cat in the head pipe gone, my bike runs so cool it is ridiculous.
You can grab the slip-ons immediately after riding.
This may help: Who Has Done A SE 131 Kit Dyno'd, Hp results? - Harley Davidson Forums (hdforums.com)
Aside from labor that's a fairly cheap upgrade. Btw with the Cat in the head pipe gone, my bike runs so cool it is ridiculous.
You can grab the slip-ons immediately after riding.
This may help: Who Has Done A SE 131 Kit Dyno'd, Hp results? - Harley Davidson Forums (hdforums.com)
Appreciate the info on the Power Vision only tune. Looks like there is a bit of power over the SEPST but the real power is going to require a cam and exhaust swap. Still really easy to get to 150/150. The bike does run really well making the power now but I bet 150/150 is another level. Someday....
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