Usually several mods are made by the manufacturer to alter an engine's characteristics based on the application. The exact same engine block and piston drivetrain is only one component. The head's valves, grind, cams, and ECU Map all change the engine's torque and hp curves. The Bobber engine was tuned for a cruiser application, lots of low end torque and a smooth linear torque curve without a sharp change with rpm. I would assume the Truxton has a performance curve which would have lower torque but higher hp at higher rpms. So for those that are used to keeping the engine at high revs there is more available horsepower at high revs but less torque throughout the curve with a rising curve rather than a flatter one, this will give a greater top end speed.
For almost all who buy a Bobber or Speedmaster for that matter, they will prefer the riding experience the way it is. For most of the types of riding they will do they engine will actually "feel" stronger with better low end acceleration, as torque is what matters. This is why electric cars feel so fast, they have immediate low end torque with an absolutely flat curve to terminal rpm.
So I am suggesting that you ride a Truxton first prior to making changes you may not like it.
Example. I recently completed a Stage IV to my 2014 HD Road King CVO. Increased displacement from 110 to 117. BUT I chose a cam with a flat torque curve from 2000 all the way to 5500 (the real rpm range on a Harley) and had a DYNO and Map created to enhance low and midrange torque rather than high rev HP. A buddy of mine with a similar bike but with a cam and tuned for maximin HP tried mine. I have 14 more ft-lbs or torque and he has 20 more hp. His bike has a faster top end speed. However, he is having his redone to more closely duplicate my bike, as mine is much more rideable, and smooth throughout the rpm range, but not only that I can do early upshifts and not downshift if I choose and he cannot, he has to maintain at least 1000 higher rpm than I do. On paper one might think that his is the better setup--however real world riding is the test.
Thank you for the thought out response, I know the ECU map and everything is important to the the bike, in these specific bikes (Thruxton and Bobber) I just felt like for as much as the bike costs, there’s no reason it shouldn’t have 85+HP and around the same amount in torque, I know torque is an important factor especially as far as the bike feeling fast, but I want a good top speed too
(For the record I think the Thruxton should have higher HP and maybe a tad more torque as well, along with every single Harley lol)
I just see bikes like he VMAX (and yes, the Bobber is beautiful and I know there is a sizable price gap between them) but compared to a Harley, there the same price, but
VMAX=170hp And 112torque
Harley 114 M8 Fat Bob= 95ishHP and 112torque
I just dont understand why Harley, Triumph, and Indian make bikes like this that don’t compete power wise with the “big four”. They have a lot going for them, but they cost more and don’t have as much power.
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