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  1. #1
    Member BJ's Avatar
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    Softail HD Engine Staged Upgrades

    Hi Folks, just enquiring if anyone here has a lot of experience with the HD Staged upgrades.

    I ride a 2015 Heritage Classic, like the bike the ride and handling and want to stay with her just needed that extra performance with increased Torque and some HP.
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  2. #2
    Member BJ's Avatar
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    Anyone here done any Dyno work on their engines
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  3. #3
    Member dave05's Avatar
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    no but as and when you do let us know the gains etc BJ will be interesting

  4. #4
    Member BJ's Avatar
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    Hi Dave, done a lot of work researching and paying out for some work and still more to do, love my ride and just want that extra thrust occassionally, what the heck.

    Started with a stage 2 raising the HP slightly and the Torgue but realised that was not really enough umph so went to the HD Stage IV kit and yep, got some reasonable numbers adding the 255 cams and & SE-CNC Heads and SE 58mm throttle body that come with the kit and the V&H Straight Shots:

    Then I got HD to change the Stage 2 and installed the HD full Stage IV kit with increased compression pistons and lifters, stayed with the V&H Straight Shots and big Screaming Eagle air filter and changed the cams to the 259e cams. Numbers were 94HP and 102 Torgue. Now Torgue is really what we want, the acceleration out of corners and roundabouts, the HP really only helps the high end and running 70mph plus, the HP is fine but I think less important for us Harley riders. If you want 120-130mph plus, buy a sports bike I guess.

    HD in Bridgewater did the Dyno runs for me and out of 3 runs, I quoted the average numbers

    Now, this is where it starts to get interesting, if I stay with the Stage IV setup and and change the V&H Straight Shot exhaust pipes to the V&H Pro 2-1 exhaust, the Torgue will increase circa 6-7 and HP 10-11 and thats quite a big jump (numbers provided by Screaming Eagle factory). But, with further research, rather than the V&H Straight Shots that look good, or changing to the V&H Pro 2-1, I would get increased performance by fitting the Fat Cat D&D 2 -1, as this exhaust system will give increased Torgue and HP over the Pro V&H 2-1!

    Adding to the Stage IV, you could add the Stage V Big Bore Kit but working for some weeks now with Fuel-Moto in the USA, they have hundreds of Dyno results and instead of changing from the 103 to the Big Bore 110 kit, they suggest just changing the Cams to 999-6A with adjustable push rods click here and gaskits click here, the D&D Fat Cat chrome exhust 580z-32 and change the lifters click here. Also tuning the bike is the most import aspect and without a Dyno, (no bike can be really tuned simply plugging in the Screaming Eagle software box)! Then use the Fuel Moto tuner with a Dyno for best results click here.

    So, lot of info but all backed up with some inside HD technicians here in the UK and Fuel-Moto head of technical support and Screaming Eagle tech support who has personally worked on thousands of Harleys.

    Work still in progress but when I finish, I shall publish the results so you will have some solid info before anyone decides to make changes to their engines performance, I can assure you, having HD over here do the work is fine, but there are better performing parts out there that are HD approved, so shop around folks, worth doing the research.

    Link might help >>>Torgue v HP<<<

    Last edited by BJ; 11-03-2017 at 10:24 AM.
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  5. The Following User Says Thank You to BJ For This Useful Post:

    acbreeze (11-03-2017)

  6. #5
    Member BJ's Avatar
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    What is Horsepower?

    Horsepower is a unit of measurement designed to quantify the work an engine is doing. When the term horsepower was developed, horses were still one of the major transportation and work methods in use, but steam power was a rising force. Steam engine manufacturers needed a way to demonstrate the value of steam compared to horsepower. The calculations for a single horsepower are based on the amount of work a horse could do per minute. Of course, that varies by the horse and the task in question, so today, engine manufacturers use a stabilized number as a representation. One horsepower is the equivalent amount of work that it takes to move 33,000 pounds for a distance of one foot in one minute.

    What Does Horsepower Mean?

    In any engine, horsepower is continuous power. After the engine gets up to speed, the horsepower keeps it there. Horsepower is the high end of engine performance. It doesn’t get the vehicle (bike or car) off the starting gate quickly, but it does allow the motor to perform flawlessly at high speeds. More horsepower means a smooth ride after acceleration.

    Where Does Torque Come In?

    Torque is what allows a bike or car to jump off the starting line like a rocket. Torque is the measure of how much force causes an object to rotate. Typically measured in pounds per foot, an engine’s torque value determines its acceleration. The average buyer may not understand the difference, but if you are an enthusiast, you certainly do. According to Charles Hubbard with Lexus College, “A lot of people buy horsepower, when what they really want is torque.”
    Exciting numbers like zero-to-60 in less than four seconds don’t happen due to horsepower. They happen when the bike has enough torque to support that kind of rapid acceleration.
    Last edited by BJ; 11-03-2017 at 10:00 AM.
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