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09-24-2009, 07:05 AM
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#1 (permalink)
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IronButt
Join Date: Dec 2005
Location: Peoria, IL
Posts: 245
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103" w/Andrews 55, FatCat vs. 95" w/Woods TW6, Rinehart TD's
This is the comparison of my 06 Ultra. I plotted the original 95" set up that had Woods TW6 with Rineharts and the SE Performance Heads. The heads have had some serious rework with porting and a 1.95" intake/1.65 exhaust valve change. The intake was also bored to 50 mm and the exhaust changed to a standard Fat Cat.
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2006 FLHTCUI, 103", Wiseco's .010 over, SE Perf. Heads modified to 86cc's by Jay Riddle Racing, SE Pushrods, Andrews 55N with roller chain mod., S&S Lifters w/HTL, 3.37:1, D&D FatCat 2-1, Kuryakyn Hi-Five Breather, PC 3USB, 25 deg. injectors, Baisley Spring, 114 TQ/110 HP
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10-22-2009, 06:50 AM
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#2 (permalink)
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IronButt
Join Date: Dec 2005
Location: Peoria, IL
Posts: 245
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How do you get rid of that infamous torque dip on the Fat Cats with standard baffle? My tuner was able to shift it slightly to the left and reduce the magnitude of it , but I see it an many dyno pics on this site and on other forums as well.
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2006 FLHTCUI, 103", Wiseco's .010 over, SE Perf. Heads modified to 86cc's by Jay Riddle Racing, SE Pushrods, Andrews 55N with roller chain mod., S&S Lifters w/HTL, 3.37:1, D&D FatCat 2-1, Kuryakyn Hi-Five Breather, PC 3USB, 25 deg. injectors, Baisley Spring, 114 TQ/110 HP
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10-22-2009, 07:30 AM
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#3 (permalink)
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Iron Butt, SS2000
Join Date: Oct 2005
Location: Bradenton, FL
Posts: 2,279
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Nice. Lots of area under the curve. Classic example of that pipe (well tuned) on a bagger. I don't know that you can eliminate that dip. That's why it's "infamous" as you say. But really, can you feel the dip? The HP line does not appear as though the dip would be noticeable at all.
The dip is a result of the trade off for getting so much extra power right off idle. It's a good compromise I think.
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'04 Ultra built & tuned by Doc @ HDMD88 Tuning Center
 
'01 FXD built & tuned by Doc @ HDMD88 Tuning Center
 
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10-22-2009, 08:52 AM
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#4 (permalink)
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Axe Man
Join Date: Feb 2006
Location: Central WI
Posts: 2,978
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Looks like you gained a bunch. The best method I have found to eliminate that dip is with the install of a Supertrapp Supermeg.
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2007 Ultra
Woods 7H cams
Heads ported by BigBoyz
103 BB SE flattop cast pistons
D&D Fatcat, SE/AC
2006 Streetbob.........SOLD!!!
1982 FXRS
Scratched paint
Rotten tires
Bad brakes
Sticky clutch
Still runs like a champ!!
Don't ride faster than your guardian angel can fly.
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10-22-2009, 12:14 PM
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#5 (permalink)
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IronButt
Join Date: Dec 2005
Location: Peoria, IL
Posts: 245
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Of course I don't feel that dip as I'm ripping through 3-4K rather quickly, but my thought was that there may be a way to go go positive on the bump instead of this way...there may not be much more to gain out of this build anyway as I'm fairly pleased with the performance...just a random thought on the Fat Cat. BTW, as most of us know who have called D&D, the guy I spoke with was non-committal on going with the next size baffle on a 103 since that is kind of the in-between bore recommendation for taking the next step up. Would the larger QBaffle be an option or would I lose on the bottom?
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2006 FLHTCUI, 103", Wiseco's .010 over, SE Perf. Heads modified to 86cc's by Jay Riddle Racing, SE Pushrods, Andrews 55N with roller chain mod., S&S Lifters w/HTL, 3.37:1, D&D FatCat 2-1, Kuryakyn Hi-Five Breather, PC 3USB, 25 deg. injectors, Baisley Spring, 114 TQ/110 HP
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10-22-2009, 08:57 PM
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#6 (permalink)
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Doof! There it is.....
Join Date: Oct 2008
Location: Maryland
Posts: 514
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Take a look at my 103 chart. I'm running a Low Cat with a quiet baffle (on a "B" motor), and I'm not seeing a dip.
__________________
'05 Vivid Black Night Train
Lots o' black
103 by Dave at JD's
116.70/116.01 SAE
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10-23-2009, 12:19 AM
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#7 (permalink)
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Iron Butt, SS2000
Join Date: Oct 2005
Location: Bradenton, FL
Posts: 2,279
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The dip seems to be exclusive to the bagger.
__________________
'04 Ultra built & tuned by Doc @ HDMD88 Tuning Center
'01 FXD built & tuned by Doc @ HDMD88 Tuning Center
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10-23-2009, 05:37 AM
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#8 (permalink)
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Doof! There it is.....
Join Date: Oct 2008
Location: Maryland
Posts: 514
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Quote:
Originally Posted by jerry34208
The dip seems to be exclusive to the bagger.
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That's bizarre.
__________________
'05 Vivid Black Night Train
Lots o' black
103 by Dave at JD's
116.70/116.01 SAE
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10-23-2009, 09:55 AM
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#9 (permalink)
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Iron Butt, SS2000
Join Date: Oct 2005
Location: Bradenton, FL
Posts: 2,279
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The length from the valve to the collector is longer on the bagger pipe.
__________________
'04 Ultra built & tuned by Doc @ HDMD88 Tuning Center
'01 FXD built & tuned by Doc @ HDMD88 Tuning Center
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11-01-2009, 10:47 AM
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#10 (permalink)
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MaxHeadflow
Join Date: Jan 2002
Location: San Diego, Ca
Posts: 909
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Quote:
Originally Posted by '05Train
Take a look at my 103 chart. I'm running a Low Cat with a quiet baffle (on a "B" motor), and I'm not seeing a dip.
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Look at the tq at 2.5K 110 compared on his compared to your measly 90 at 2500.. I'd take his tq curve any day.. Bruce
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Guy who lost 15 bux to this place due to some stupid button somewhere.
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11-01-2009, 02:38 PM
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#11 (permalink)
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Doof! There it is.....
Join Date: Oct 2008
Location: Maryland
Posts: 514
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Quote:
Originally Posted by Bruce Woltz
Look at the tq at 2.5K 110 compared on his compared to your measly 90 at 2500.. I'd take his tq curve any day.. Bruce
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Ummm...OK Bruce, and your point would be? Or is this just another post of yours where you're gonna slag someone else's build?.... 
It's always a pleasant treat when you spread your sunshine around... 
__________________
'05 Vivid Black Night Train
Lots o' black
103 by Dave at JD's
116.70/116.01 SAE
Last edited by '05Train : 11-01-2009 at 02:41 PM.
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11-01-2009, 03:15 PM
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#12 (permalink)
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Lifetime Premium
Join Date: Nov 2005
Location: alabama
Posts: 9,325
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bruce is a no BS kinda guy. he told me once he deals in fact, not fiction. hurt my feelins, i whined for days.
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truth and equality for all. this is still AMERICA!
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11-01-2009, 04:00 PM
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#13 (permalink)
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Let er rip!
Join Date: Jun 2004
Location: MN
Posts: 2,362
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"FACT" is that it's an apples to oranges comparison.....
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107" built by Hyperformance aka King of Cubes
R&R St. V cast heads
R&R 615/585's
R&R Cam plate
R&R Roller Rockers
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11-01-2009, 07:29 PM
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#14 (permalink)
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Moneygreen
Join Date: Jun 2008
Location: Trenton,N.J.
Posts: 3,501
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Quote:
Originally Posted by '05Train
Ummm...OK Bruce, and your point would be? Or is this just another post of yours where you're gonna slag someone else's build?....
It's always a pleasant treat when you spread your sunshine around... |
Don't know what was meant by that statement either,but you have a hell of a build.Dave did a great job.he will be starting my build next week!!!
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There is no replacement for displacement!!!! 
Craig G. 
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11-01-2009, 08:11 PM
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#15 (permalink)
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MaxHeadflow
Join Date: Jan 2002
Location: San Diego, Ca
Posts: 909
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Quote:
Originally Posted by '05Train
Ummm...OK Bruce, and your point would be? Or is this just another post of yours where you're gonna slag someone else's build?....
It's always a pleasant treat when you spread your sunshine around... |
Well on other forums, they call me mister "cheap shot"
I'm just reading the dyno sheets as I see em... Who care about a dip if the net Tq is more more than someone else's..
Bruce
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Guy who lost 15 bux to this place due to some stupid button somewhere.
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