Stock Dyna 103 to Dyna 103 stage 1 HP gain?
Club Member
Joined: Apr 2016
Posts: 11,500
Likes: 8,336
From: Inland NW
OP:
Stock Dyna 103 to Dyna 103 stage 1...HP gain?
Stock Dyna 103 to Dyna 103 stage 1, HP gain?
Stock Dyna 103 to Dyna 103 stage 1. HP gain?
Tourer
Joined: Jan 2017
Posts: 250
Likes: 54
From: Arlington, TX
I've got a 2016 Switchback with the high output 103. I've added a Vance and Hines slip on, a de-catted stock header, a Screaming Eagle Stage One intake, and a Power Vision tune from the dealer. Stock performance prior to the mods was adequate, but boring. I'm now happier with my bike because it has great torque, revs freely, sounds great and cruises beautifully from 1500 to 3000 rpm. I'm sure more power would give me additional bragging rights, but I doubt that it would improve the Switchback for my riding style. Given the way the bike performs, I don't care what a dyno run will show, because the current configuration works great for me.
Extreme HDF Member
Joined: Jun 2011
Posts: 10,216
Likes: 224
From: Glendale AZ
When I went from straight shots to short shots with quiet baffles I didn't lose any power at all. I believe the back pressure caused from the QBs was instrumental in facilitating that. The seat of pants feel from stock to a stage 1 was the power distribution was spread across the entire throttle range instead of having a flat spot in the higher rpm ranges. In fact there was a valve chatter (or ping) when I pegged the throttle stock which disappeared. If I gained torque or hp, I would say it's too little to say for sure and 7hp is not enough to feel without doing a dyno run . I am very happy with my performance configuration with average 41mpg.
Last edited by TUCCI; Apr 23, 2017 at 09:58 AM.
I have a Stage I in my 2015 FXLD...Cobra true duals, opened air box, tuned with a SE Super Tuner Pro...78 HP, 95 ft. lbs of torque. I have a Stage IV race kit in my bagger and only have a little over 104 ft. lbs. and the Dyna is 230 lbs. lighter...
Seasoned HDF Member
Joined: Apr 2014
Posts: 5,813
Likes: 2,554
From: UK
In my (limited) experience, you will be lucky to see 75 rear wheel horsepower from stock 103" bike - more likely 65-70 rwhp on a truthful dyno. And maybe 85- 90 TQ
Stage 1 using good, matched parts will get you to 80 rwhp, 100 TQ if you are lucky - certainly not much more.
So meaningful gains are there for sure. Just take your time choosing parts that will work well with your bike and the style of riding you like.
Then start saving up for cams and headwork.
Stage 1 using good, matched parts will get you to 80 rwhp, 100 TQ if you are lucky - certainly not much more.
So meaningful gains are there for sure. Just take your time choosing parts that will work well with your bike and the style of riding you like.
Then start saving up for cams and headwork.
Cruiser
Joined: Feb 2015
Posts: 209
Likes: 6
From: Ontario Canada
I've got a 2016 Switchback with the high output 103. I've added a Vance and Hines slip on, a de-catted stock header, a Screaming Eagle Stage One intake, and a Power Vision tune from the dealer. Stock performance prior to the mods was adequate, but boring. I'm now happier with my bike because it has great torque, revs freely, sounds great and cruises beautifully from 1500 to 3000 rpm. I'm sure more power would give me additional bragging rights, but I doubt that it would improve the Switchback for my riding style. Given the way the bike performs, I don't care what a dyno run will show, because the current configuration works great for me.
How would a Dyna 103 perform with just Screaming Eagle slip ons, a high flow air filter, and a different map? Thank you.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Road Captain
Joined: Dec 2005
Posts: 534
Likes: 35
From: Western Australia
To be honest, i noticed no difference from stock to full stage one, but i think that mostly has to do with exhaust choice i went with which was vance and hines short shots, i think they just robbed all the torque. My buddies street bob with just a 2-1 pipe nothing else feels like it pulls better than mine
I've got a 2016 Switchback with the high output 103. I've added a Vance and Hines slip on, a de-catted stock header, a Screaming Eagle Stage One intake, and a Power Vision tune from the dealer. Stock performance prior to the mods was adequate, but boring. I'm now happier with my bike because it has great torque, revs freely, sounds great and cruises beautifully from 1500 to 3000 rpm. I'm sure more power would give me additional bragging rights, but I doubt that it would improve the Switchback for my riding style. Given the way the bike performs, I don't care what a dyno run will show, because the current configuration works great for me.