Butt Dyno Wrong?

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Oct 19, 2019 | 04:46 PM

cj24

Thread Starter

Road Master

Joined: Nov 2018

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From: CA

Butt Dyno Wrong?

I just installed a DK587 AC on my FLDE. Besides this it is completely stock and run's great. It seems I hit higher speeds at lower rpms... and more spunky. Is it placibo effect? I don't know... but happy with the purchase and no symptoms of needing a tune as some suggested. Also it's nice now having a external breather on new bike. I will add new slip on and tuner when I get further into warranty. But good purchase imo

Oct 19, 2019 | 06:57 PM

Hulkss

HDF Community Team

Joined: Sep 2013

Posts: 2,351

Likes: 2,310

From: Wisconsin

Quote:

Originally Posted by cj24

I just installed a DK587 AC on my FLDE. It seems I hit higher speeds at lower rpms

Impossible

Quote:

Originally Posted by cj24

I just installed a DK587 AC on my FLDE. Besides this it is completely stock and run's great.... and more spunky. I don't know... but happy with the purchase and no symptoms of needing a tune as some suggested. Also it's nice now having a external breather on new bike. I will add new slip on and tuner when I get further into warranty. But good purchase imo

Yup, It probably runs a bit better.

Oct 19, 2019 | 07:10 PM

cj24

Thread Starter

Road Master

Joined: Nov 2018

Posts: 860

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From: CA

Yep I agree on the hitting higher speed's at lower rpms impossible lol. Maybe I'm just getting up to speed faster... or it running better just makes it seem so. At any rate happy with the purchase and install

Oct 19, 2019 | 08:11 PM

Thingfish

Grand HDF Member

Joined: Jun 2010

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From: coast to coast

Honestly I find the butt dyno means a lot more to me than the paper type...

I’ve never ridden a piece of paper.

Oct 19, 2019 | 10:22 PM

Hulkss

HDF Community Team

Joined: Sep 2013

Posts: 2,351

Likes: 2,310

From: Wisconsin

Quote:

Originally Posted by Thingfish

Honestly I find the butt dyno means a lot more to me than the paper type...I’ve never ridden a piece of paper.

The but dyno is easily fooled by changing the throttle progressivity table which the tuners do by default. It just commands the throttle plate to open more for a given amount of wrist twist. Makes the bike really seem quicker, however, more throttle is being used.

If tuning for power, the only known point to compare is running wide open. It is the only fixed reference throttle position that does not change. Always butt dyno test wide open. Maybe use one of those dragstrip dyno phone apps.

If tuning for driveability, it is possible for most riders to tell if the bike runs well or poorly.

Oct 19, 2019 | 11:10 PM

Sideburn

Tourer

Joined: Sep 2019

Posts: 371

Likes: 146

From: Colorado

Quote:

Originally Posted by Thingfish

Honestly I find the butt dyno means a lot more to me than the paper type...

I’ve never ridden a piece of paper.

As long as the engine is running in good order, I’m totally with you brother.

Oct 20, 2019 | 12:13 PM

AJ88V

Road Master

Joined: Aug 2018

Posts: 965

Likes: 297

From: NoVa

Butt dyno has more than the butt as input. That intake honk for the new air cleaner certainly does improve the experience. And folks (well, at least I...) seem to spend more time just twisting the throttle to feel/hear the big performance gains from whatever doodad we just installed (air cleaner, exhaust, cam....). We're riding more aggressively and it just feels like something must be better, and if you're enjoying it, it's all good.