Dyno'd my Street 500 - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 13 Old 10-08-2016, 09:01 PM Thread Starter
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Dyno'd my Street 500

Kind of disappointed in the numbers I got, but I'm fully happy with the bike, so they are what they are. Just did a few baseline pulls. Guy actually said my FP3 tune is virtually spot on, there'd be no point in tuning it. I've got the V&H Naked O2 intake. NGK Iridium Plugs, Sumax plug wires, Firebrand Grand Prix exhaust, and of course the V&H FP3 tuner. I used the V&H intake and the V&H exhaust w/o baffles tune. Video coming shortly. For now, here's the dyno sheet.
36hp, 31ft/lbs torque. Guy on the dyno was blown away at a Harley revving to 8500rpm.
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2016 Street 5̶0̶0̶ 750
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post #2 of 13 Old 10-08-2016, 09:40 PM
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So, that's 72 hp/liter. The 750 develops, as per the Cycle World test, around 77 hp/liter; according to the motorcycle.com test, it's about 72 hp/liter. A Sportster 883 develops about 53hp/liter. Yamaha's Star Bolt makes 49 hp/liter. Honda's NC700X makes 71.6 hp/liter.

I know you expected/wanted more, but really, for a Harley v-twin, these are outstanding numbers. When's the last time a Harley made more power than a comparable-design Honda or Yamaha? Never?

I've got the Nightstick slip-on, V&H Naked intake, and the FP3 for my 750, but haven't had a chance to install 'em yet. Ideally I'd like to find a local shop where I could do a before & after test, on the same dyno, to eliminate as many variables as possible.

I guess the big question is -- how does your 500 perform, real-world, using the butt dyno? Versus when it was stock?

Harley lists the stock XG500 at 29.5 ft/lbs, so 31 isn't a huge jump, but it's over 5%. That's peak though; it'd be nice to see a before & after to see how much it's gained all throughout the rev range.
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post #3 of 13 Old 10-09-2016, 12:25 AM Thread Starter
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https://youtu.be/-zTRAqf-n28
Here's the video. And as far as butt dyno, I was really predicting 45hp. It feels plenty fast to me. Still very happy with the bike.

2016 Street 5̶0̶0̶ 750
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post #4 of 13 Old 10-09-2016, 06:16 AM
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My 750, Same Setup. Different Tune. V&H SO with Baffle and High Velocity Intake Dyno'd at 70 HP and 58 Ft Lbs Torque.
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post #5 of 13 Old 10-09-2016, 07:34 AM
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Quote:
Originally Posted by Tucsonmax1 View Post
My 750, Same Setup. Different Tune. V&H SO with Baffle and High Velocity Intake Dyno'd at 70 HP and 58 Ft Lbs Torque.

So twice the hp from the 750 as the 500.
Something dodgy somewhere.


2017 Harley-Davidson Road Glide Ultra DYNO TEST Video Review | Cycle World


and almost as much as the new 107 milwaukee 8.


Not all dynos are created equal.
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post #6 of 13 Old 10-10-2016, 01:48 PM
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Originally Posted by Eggy View Post
Not all dynos are created equal.
That's for sure. The only fair way to compare would be to run both bikes on the same day under the same condition on the same dyno. Not the same model of dyno, but the actual same dyno.

What are these dyno runs costing you guys?
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post #7 of 13 Old 10-10-2016, 01:54 PM
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Originally Posted by UnaClocker View Post
https://youtu.be/-zTRAqf-n28
And as far as butt dyno, I was really predicting 45hp. It feels plenty fast to me. Still very happy with the bike.
Okay, so here's the thing - the "peak" horsepower may not even be changed at all, but the overall power curve might be somewhat or even greatly enhanced. That's the kind of thing you can only really know if you have a "before" run, and an "after" run.

The K&N Filtercharger is a great example. Look at their chart here:
http://www.knfilters.com/dynocharts/63-1130_dyno.pdf

Now, check that out carefully. If you look at the absolute peak power, the point where both the "stock" and the "filterchargered" bikes are making their absolute most horsepower, that happens at about 7200 to 7800 RPM. And the blue line, the stock bike, actually makes a little more power than the K&N bike does at 7800(!) But if you were to say "a bike with the K&N filtercharger makes less HP than one without", that would be a totally dishonest representation of what really happens. The K&N bike is showing excellent power gains throughout the power band, especially where it counts - 3000 to 6000 RPM, even if the actual "peak" horsepower might be a tiny bit lower than the stock bike.

So it's entirely possible that your bike is doing the same. You might be getting some nice decent substantial increases throughout the power band, but the absolute peak (usually achieved only at the highest RPMs) might not be all that impressive.

So, yeah, I've just talked myself into spending the extra to get a before and an after run for when I install my goodies...
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Last edited by Gaijin; 10-10-2016 at 01:57 PM.
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post #8 of 13 Old 10-11-2016, 09:39 PM Thread Starter
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Quote:
Originally Posted by Gaijin View Post
That's for sure. The only fair way to compare would be to run both bikes on the same day under the same condition on the same dyno. Not the same model of dyno, but the actual same dyno.

What are these dyno runs costing you guys?
$80

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post #9 of 13 Old 10-12-2016, 05:21 AM
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post #10 of 13 Old 10-13-2016, 01:09 AM
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Originally Posted by UnaClocker View Post
Kind of disappointed in the numbers I got, but I'm fully happy with the bike, so they are what they are. Just did a few baseline pulls. Guy actually said my FP3 tune is virtually spot on, there'd be no point in tuning it. I've got the V&H Naked O2 intake. NGK Iridium Plugs, Sumax plug wires, Firebrand Grand Prix exhaust, and of course the V&H FP3 tuner. I used the V&H intake and the V&H exhaust w/o baffles tune. Video coming shortly. For now, here's the dyno sheet.
36hp, 31ft/lbs torque. Guy on the dyno was blown away at a Harley revving to 8500rpm.
I was expecting around 40HP at wheel considering the changes you made. One thing I see is that torque starts decreasing quite rapidly after around 5300 RPM. I have not seen the dyno graph of a stock 500 (so this maybe expected) but for 750 torque really starts reducing only after 7000RPM. I would expect this behaviour to be similar for both bikes.

Quote:
Originally Posted by Tucsonmax1 View Post
My 750, Same Setup. Different Tune. V&H SO with Baffle and High Velocity Intake Dyno'd at 70 HP and 58 Ft Lbs Torque.
70HP is quite impressive compared to stock which is around 53 to 57HP

Last edited by meph1st0; 10-13-2016 at 01:18 AM.
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