Harley Davidson Forums

Touring Models Road King, Road King Custom, Road King Classic, Road Glide, Street Glide, Electra Glide, Electra Glide Classic, and Electra Glide Ultra Classic bikes.
Sponsored by:
Sponsored by:

DYNO Numbers for Baggers???

Thread Tools
 
Search this Thread
 
Old Aug 30, 2011 | 10:25 AM
Share
  #2631  
Biggzed's Avatar
Biggzed
Seasoned HDF Member
20 Year Member
Liked
Loved
Community Favorite
Joined: Dec 2005
Posts: 5,464
Likes: 624
Default
Originally Posted by troop
What affects the differences between cable/TBW bikes on the dyno?
Not sure if I have read a definitive answer on this, but people have suspected the actual throttle body as one of the bottle necks. It is different than the cable throttle body last used in '07. Maybe Harley Tuner has some ideas?

Zach
 
Reply
0
Old Aug 30, 2011 | 06:40 PM
Share
  #2632  
Deuuuce's Avatar
Deuuuce
Elite HDF Member
Joined: Apr 2007
Posts: 3,766
Likes: 16
From: Roseville, CA
Default
If stock TBW opens all the way then it isn't a restriction. With cars, and probably bikes, going with a larger throttle body is usually detrimental unless you're flowing significantly more air than stock. Even heads/cam may not justify it.

There is probably a formula, I'm sure.
 
Reply
0
Old Aug 30, 2011 | 08:06 PM
Share
  #2633  
harleytuner's Avatar
harleytuner
Outstanding HDF Member
Joined: Mar 2009
Posts: 3,253
Likes: 222
From: Fredericksburg, Va.
Default
Originally Posted by Biggzed
I'm thinking of going to the S&S 106" drop on kit this winter. I'm a little light on compression for the 590's and the extra bore in the S&S kit would put me right where I need to be. If I do it, I will probably send this throttle body to HPI for their upgrade work. We'll see as this combo runs very well.

Zach
I sent you a PM
 
Reply
0
Old Aug 30, 2011 | 08:12 PM
Share
  #2634  
harleytuner's Avatar
harleytuner
Outstanding HDF Member
Joined: Mar 2009
Posts: 3,253
Likes: 222
From: Fredericksburg, Va.
Default
Originally Posted by Deuuuce
If stock TBW opens all the way then it isn't a restriction. With cars, and probably bikes, going with a larger throttle body is usually detrimental unless you're flowing significantly more air than stock. Even heads/cam may not justify it.

There is probably a formula, I'm sure.

The cabled throttle bodies will open up 100% instantly. the TBW bike "ramp" open, takes a second or so, so that is (was) a big draw back. The SE pro Super Tuner, TTS Mastertune and I believe the new PC Vision have throttle progrestivity adjustments that will take the delay out, so if you have one of these tuners and it is set up correctly the TBW throttle bodies work just as well as the cabled ones. I polished mine and have had great results, although I am going to be swaping out for an HPI 54 mm in the near future. As of now I am running my stock (46 mm) on my 07 with a 110".
 
Reply
0
Old Aug 30, 2011 | 11:15 PM
Share
  #2635  
Biggzed's Avatar
Biggzed
Seasoned HDF Member
20 Year Member
Liked
Loved
Community Favorite
Joined: Dec 2005
Posts: 5,464
Likes: 624
Default
The progrestivity issue shouldn't effect peak numbers though, right? Even if it isn't adjusted to work like a cable, the butterfly is fully open well before the motor would make peak power I would think.

I'm wondering if the overall design of the FBW pieces just don't flow as well as the cable tb's?

Zach

Thanks for the PM. I'll let you know. Interesting alternative.
 
Reply
0
Old Aug 31, 2011 | 01:26 AM
Share
  #2636  
Mike's Avatar
Mike
Ultimate HDF Member
Joined: Jun 2009
Posts: 6,786
Likes: 40
From: Centralia, Wa
Default
Originally Posted by Biggzed
I'm thinking of going to the S&S 106" drop on kit this winter. I'm a little light on compression for the 590's and the extra bore in the S&S kit would put me right where I need to be. If I do it, I will probably send this throttle body to HPI for their upgrade work. We'll see as this combo runs very well.

Zach
I'm fixing to go to 107 on my bike. The pistons and jugs are ready to go (CP forged with 3cc popups), The heads are ported and milled for ACRs, I just need to do the last little bit of cleanup on them, and I'll be bolting it all up sometime in the next few weeks. I'd like to get the bike tuned down at Latus, and don't want to be riding down there in December.
 
Reply
0
Old Aug 31, 2011 | 01:44 AM
Share
  #2637  
Deuuuce's Avatar
Deuuuce
Elite HDF Member
Joined: Apr 2007
Posts: 3,766
Likes: 16
From: Roseville, CA
Default
Ah, I'll have to check with Thundermaxx to see if they adjust for the progressiveness of the TBW.
 
Reply
0
Old Aug 31, 2011 | 07:57 AM
Share
  #2638  
harleytuner's Avatar
harleytuner
Outstanding HDF Member
Joined: Mar 2009
Posts: 3,253
Likes: 222
From: Fredericksburg, Va.
Default
Originally Posted by Deuuuce
Ah, I'll have to check with Thundermaxx to see if they adjust for the progressiveness of the TBW.

I havn't tuned a Thundermax for a TBW bike yet, but yes, I do believe they have throttle progresstivity adjustments, ithey may call it something else though
 
Reply
0
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 Aug 31, 2011 | 08:03 AM
Share
  #2639  
harleytuner's Avatar
harleytuner
Outstanding HDF Member
Joined: Mar 2009
Posts: 3,253
Likes: 222
From: Fredericksburg, Va.
Default
Originally Posted by Biggzed
The progrestivity issue shouldn't effect peak numbers though, right? Even if it isn't adjusted to work like a cable, the butterfly is fully open well before the motor would make peak power I would think.

I'm wondering if the overall design of the FBW pieces just don't flow as well as the cable tb's?

Zach

Thanks for the PM. I'll let you know. Interesting alternative.
It actually effects it more that what you would think. When the butterfly's open all the way instantly, it makes more power in the lower RPM's and it carries some of it up to peak RPM's. Not to mention, when you are tuning a TBW bike that doesn't have it turned up, for a wide open pass you have to tune the 60%, 80%, and 100% throttle position at certain RPM's to get your air fuel set right. For instance, a TBW bike twisted wide open at 2000 RPM's might go to around 60% TP from 2000 to say 3200 RPM's, then get near 80% TP untill, say, 4200 RPM's then finally go wide open at 100% to the rev limiter. A proper tune means that you would ajust the 60, 80n and 100% VE colums from 2000 tp 3000 RPM's, the 80 and 100% VE from 3000 to 4000 and the 100% from 4000 on up
 
Reply
0
Old Aug 31, 2011 | 10:28 AM
Share
  #2640  
Biggzed's Avatar
Biggzed
Seasoned HDF Member
20 Year Member
Liked
Loved
Community Favorite
Joined: Dec 2005
Posts: 5,464
Likes: 624
Default
Originally Posted by boogaloodude
I'm fixing to go to 107 on my bike. The pistons and jugs are ready to go (CP forged with 3cc popups), The heads are ported and milled for ACRs, I just need to do the last little bit of cleanup on them, and I'll be bolting it all up sometime in the next few weeks. I'd like to get the bike tuned down at Latus, and don't want to be riding down there in December.
I got to tell you, I've had 2 tunes done at Latus. One on my old Road King with a 95", S&S 510 cams, BC Gerolamy heads, true duals, PC3. Pretty basic build. It came out pretty good and ran smooth. That was back in 2006. They also tuned my Road Glide with just a pipe, air cleaner, and a SERT (I hadn't done the 103" kit yet) back in 2007. I had to take it back 2 times and it still wasn't right. They could never get rid of a pinging issue at high rpm's under full throttle. I'm not talking about months later in completely different weather conditions either. It did it on my test ride after they said it was done. I finally gave up on them and did the 103" kit then hauled it down to RC Cycles.

I know Latus has a good reputation, but I'm wondering if that rep was established when Mike Stegman was doing the tuning. He's the shop foreman now and rarely gets in the dyno room.

Have you thought about taking it north to Jarz performance? I've heard very good things about them. Don Dorfman (Deweys Heads) recommends them.

Zach
 
Reply
0



Advanced Search
Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 01:04 AM.

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