Sportster Models 883, 883 Custom, 1200 Custom, 883L, 1200L, 1200S, 1200 Roadster, XR1200, and the Nightster.
Sponsored by:
Sponsored by:

Fuelpak

Thread Tools
 
Search this Thread
 
Old Jul 4, 2008 | 09:04 PM
  #1  
NYSport's Avatar
NYSport
Thread Starter
|
Advanced
Joined: May 2008
Posts: 73
Likes: 0
From: NY
Default Fuelpak

I had the dealer install shortshots and a fuelpak. So far I'm not impressed with the tune. The engine has poor throttle response at low RPM and some decel popping. I talked to a local dyno place and they recommend a PClll. I'd rather stick with the fuelpak and try to get some improvement before I spend money on something that may or may not improve the engine performance. Any ideas? Thanks
 
Reply
Old Jul 5, 2008 | 04:56 AM
  #2  
jerryh57's Avatar
jerryh57
Tourer
Joined: Oct 2007
Posts: 342
Likes: 1
From:
Default RE: Fuelpak

Did you change out the stock A/C?? I think once you change pipes and add fuel pak, your gonna run rough (air starved to the max) until you get more air coming in.
 
Reply
Old Jul 7, 2008 | 08:17 AM
  #3  
Black No.1's Avatar
Black No.1
Advanced
Joined: Jun 2008
Posts: 90
Likes: 0
From: Augusta County, Virginia
Default RE: Fuelpak

I have the shortshots and fuelpak as well. If you haven't changed your air cleaner, do it ASAP.&nbsp\\; You're runnin way too rich.&nbsp\\; My bike runs way better w/ the fuelpak and exhaust.&nbsp\\; I do have some decel popping, but it's hard to get rid of it all with such short pipes. I also had to change some of the settings in the fuelpak (per V&amp\\;H tech support).&nbsp\\; They were super cool, BTW.&nbsp\\; After being on the phone with them for no more than 10 minutes, most of the decel popping was gone.
 
Reply
Old Jul 7, 2008 | 06:01 PM
  #4  
jasperpso's Avatar
jasperpso
Cruiser
Joined: Apr 2008
Posts: 217
Likes: 0
From: Burlington, Iowa
Default RE: Fuelpak

+1 the fuel pak REQUIRES a high flow air cleaner..ie big sucker or se stg 1
 

Last edited by jasperpso; Aug 7, 2008 at 05:58 PM.
Reply
Old Jul 7, 2008 | 07:01 PM
  #5  
VBCH Nightster's Avatar
VBCH Nightster
Cruiser
Joined: Jul 2007
Posts: 150
Likes: 0
From: Da Beach
Default RE: Fuelpak

ORIGINAL: Black No.1

I have the shortshots and fuelpak as well. If you haven't changed your air cleaner, do it ASAP.&nbsp\\;\\\\\\; You're runnin way too rich.&nbsp\\;\\\\\\; My bike runs way better w/ the fuelpak and exhaust.&nbsp\\;\\\\\\; I do have some decel popping, but it's hard to get rid of it all with such short pipes. I also had to change some of the settings in the fuelpak (per V&amp\\;\\\\\\;H tech support).&nbsp\\;\\\\\\; They were super cool, BTW.&nbsp\\;\\\\\\; After being on the phone with them for no more than 10 minutes, most of the decel popping was gone.
Which map are you using, which modes did you adjust, and to what settings?
 
Reply
Old Jul 7, 2008 | 07:59 PM
  #6  
Black No.1's Avatar
Black No.1
Advanced
Joined: Jun 2008
Posts: 90
Likes: 0
From: Augusta County, Virginia
Default RE: Fuelpak

I'm using FP-0681. V&amp\\;H told me to change Mode 1 to 10 and Mode 23 to 20.&nbsp\\; Most of the decel popping went away.&nbsp\\; I don't you'll get rid of all of it with those short pipes, but it helped. I did get some low speed surging, tho.

Since my last post I found some other Fuelpak changes on another thread:
Mode 6 to 10
Mode 7 to 10
Mode 8 to 0
Mode 10 to 0

A little popping is still there, but the bike is much smoother across the board.&nbsp\\; I think I like these changes much better.&nbsp\\; I may still change Mode 23 to 20.&nbsp\\; Let me know if it works for you.

j

 
Reply
Old Jul 8, 2008 | 07:33 AM
  #7  
VBCH Nightster's Avatar
VBCH Nightster
Cruiser
Joined: Jul 2007
Posts: 150
Likes: 0
From: Da Beach
Default RE: Fuelpak

ORIGINAL: Black No.1

I'm using FP-0681. V&amp\\;\\\\\\;H told me to change Mode 1 to 10 and Mode 23 to 20.&nbsp\\;\\\\\\; Most of the decel popping went away.&nbsp\\;\\\\\\; I don't you'll get rid of all of it with those short pipes, but it helped. I did get some low speed surging, tho.

Since my last post I found some other Fuelpak changes on another thread:
Mode 6 to 10
Mode 7 to 10
Mode 8 to 0
Mode 10 to 0

A little popping is still there, but the bike is much smoother across the board.&nbsp\\;\\\\\\; I think I like these changes much better.&nbsp\\;\\\\\\; I may still change Mode 23 to 20.&nbsp\\;\\\\\\; Let me know if it works for you.

j
I'm using the same map. The map settings that came with my pipes indicated 20 for mode 23, although the Fuel Pack website indicates 22. I've been experimenting and have had the setting as low as 15, and I have it set at 19 right now. The lower settings seem to eliminate most popping however the low end performance seems to suffer as a result. I'm not so much concerned about popping as I am the occasional backfire, and the engine sometimes will cough when heading out after cold startup.
&nbsp\\;
I also changed the settings for modes 6, 7, 8 and 10 from the post you referenced, and it seems to help low end performance. The engine still coughs sometimes after the cold startup. Could be all the smoke in the air from the Dismal Swamp fire.
 
Reply
Old Jul 9, 2008 | 10:21 PM
  #8  
NYSport's Avatar
NYSport
Thread Starter
|
Advanced
Joined: May 2008
Posts: 73
Likes: 0
From: NY
Default RE: Fuelpak

I had a stage 1 air intake installed at the same time the pipes and fuelpak were done. I'll check the settings tomorrow and let you know if I make an adjustment. Thanks
 
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Jul 10, 2008 | 06:59 AM
  #9  
rdss's Avatar
rdss
Road Captain
Joined: May 2008
Posts: 563
Likes: 0
From: NE FL
Default RE: Fuelpak

I am running the PC III and can totally get rid of the crackle on decel if I want.&nbsp\\; It is also capable of running just pipes, just an air cleaner and of course both.&nbsp\\; The PC III is way more diverse than the Fuel Pak in the fact that you can modify a fuel setting for any throttle position at any rpm.&nbsp\\; If the Fuel Pak has a low throttle position fuel adjust ment (at zero throttle) adding fuel there is what will get rid of the decel pop.&nbsp\\; With my Heavy Breather and Short Shots, I am at +13 duty cycles over stock and have just a little bit of crackle left, which I like.&nbsp\\; If I bumped it to 15, it would probably completely go away.
 
Reply
Old Jul 19, 2008 | 10:26 PM
  #10  
NYSport's Avatar
NYSport
Thread Starter
|
Advanced
Joined: May 2008
Posts: 73
Likes: 0
From: NY
Default RE: Fuelpak

I checked the settings that the dealer used when they installed the pipes, intake and FuelPak, WAY OFF!!! As an example mode 6 was 20 and should be 7, mode 9 was 23 and be 2 according to the online guide. In all only 5 of the 29 modes matched the online set up. The engine is better by far but I think there is still room for improvement. I have surging, mild but annoying. And I still have more decel popping than I think there should be, althouhgh it's far better than it was.

j, I'll try your settings tomorrow and see if they work better.

Tom
 
Reply



All times are GMT -5. The time now is 05:56 PM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE