The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Motor / Engine > Sportster Motorcycle Engine Conversions
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

Active Threads
0 My 1250 to 1275 build
Last Post: Bryan1976
Posted On: 14 Minutes Ago
Replies: 138
Views: 7,599
5 Vacuum petcock questions...
Last Post: Hippysmack
Posted On: 25 Minutes Ago
Replies: 40
Views: 3,599
0 69/50 Fest: The 50th Anniversary of the 1969 Sportster (Fall 2019 GBB) 9/14/19
Last Post: 60 XLCH
Posted On: 30 Minutes Ago
Replies: 67
Views: 4,566
0 This week on Craig's list
Last Post: Maxeffort
Posted On: 50 Minutes Ago
Replies: 4,286
Views: 510,193
0 Xlch Starter Issue "Need help Diagnosing the problem"
Last Post: MonkeyMadness
Posted On: 1 Hour Ago
Replies: 10
Views: 329
0 Andrews PB+
Last Post: simonster123
Posted On: 1 Hour Ago
Replies: 21
Views: 1,231
5 What Color Helmet is Most Noticable?
Last Post: NLXL
Posted On: 1 Hour Ago
Replies: 44
Views: 8,247
0 Best seat for long rides
Last Post: FuriousGeorg
Posted On: 1 Hour Ago
Replies: 124
Views: 26,952
6 Blast Project (and will be needing help most likely)
Last Post: Hornsmith
Posted On: 2 Hours Ago
Replies: 49
Views: 2,569
0 ultima iggy plate near the end of travel
Last Post: cazz1000
Posted On: 2 Hours Ago
Replies: 12
Views: 227
0 This is gonna hurt.
Last Post: Davo_137
Posted On: 3 Hours Ago
Replies: 7,757
Views: 1,547,518
0 Have my cake and eat it too? 1275 + 570s + CVJ
Last Post: jkinkade
Posted On: 3 Hours Ago
Replies: 31
Views: 708
0 Need help with S&S GB carb
Last Post: needspeed
Posted On: 3 Hours Ago
Replies: 27
Views: 693
0 Do Loud Pipes in fact save lives?
Last Post: Traxx
Posted On: 3 Hours Ago
Replies: 2,553
Views: 270,472
0 3.25x19? 90-90x19?
Last Post: c1skout
Posted On: 4 Hours Ago
Replies: 0
Views: 20
0 story with a moral
Last Post: sportymike02
Posted On: 4 Hours Ago
Replies: 0
Views: 35
0 sportster chin spoiler, yay or nay?
Last Post: Joe_jeep
Posted On: 4 Hours Ago
Replies: 28
Views: 1,714
0 Opinions - Spring plate REPLACE or REMOVE ???
Last Post: boomerguy
Posted On: 4 Hours Ago
Replies: 31
Views: 5,080
0 Vote for Most Sought After Sportster
Last Post: rocketnorton
Posted On: 4 Hours Ago
Replies: 328
Views: 72,946
0 Lets See your bike on a scenic overlook
Last Post: Joe_jeep
Posted On: 5 Hours Ago
Replies: 135
Views: 23,917
0 Tires for "Rubber mount XL" poll.
Last Post: Tomcatt
Posted On: 5 Hours Ago
Replies: 233
Views: 58,231
0 Iree's late night cafe
Last Post: rokytnji
Posted On: 5 Hours Ago
Replies: 1,300
Views: 161,744
0 Bar vibration
Last Post: NLXL
Posted On: 6 Hours Ago
Replies: 2
Views: 124
0 New rider, first ride
Last Post: Joe_jeep
Posted On: 6 Hours Ago
Replies: 14
Views: 363
0 Lake Ozark Bikefest
Last Post: Bow only
Posted On: 6 Hours Ago
Replies: 35
Views: 717
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 7 Hours Ago
Replies: 13,741
Views: 1,266,287
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 7 Hours Ago
Replies: 44,942
Views: 7,079,132
0 You asked for it! "The Tess' Coffee Thread"
Last Post: sportsterpaul
Posted On: 8 Hours Ago
Replies: 10,879
Views: 893,597
0 Seeley Ironhead race bike
Last Post: ex119x
Posted On: 8 Hours Ago
Replies: 16
Views: 873
0 Hot Chicks on Hot Bikes
Last Post: trainman
Posted On: 8 Hours Ago
Replies: 10,251
Views: 1,753,748
More...
Members Birthdays
ziggyhd1 (61), MikeDelta (61), greven (59), bliynd (34)
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #81  
Old 4 Weeks Ago
Toejam503's Avatar
Toejam503 Toejam503 is offline
Air-Cooled Forever
 
Join Date: May 2010
Location: Dakota Territory
Posts: 2,615
Sportster/Buell Model: XL 1200 C
Sportster/Buell Year: 2006
Sportster/Buell Model #2: (Prev.Own)XLH Milw.Spec.
Sportster/Buell Year #2: 1981
Reputation: 4838891
Toejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond repute
Default

Gunner, According to the formula Donny Peterson uses, your HP should be around 93+ HP @ 5500 RPM's.
Reply With Quote
Sponsored Links
  #82  
Old 4 Weeks Ago
60Gunner's Avatar
60Gunner 60Gunner is offline
Chief of Security
 
Join Date: Sep 2017
Location: United States
Posts: 1,920
Sportster/Buell Model: 1200/1250C
Sportster/Buell Year: 05
Reputation: 2195891
60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute
Default

Quote:
Originally Posted by Toejam503 View Post
Gunner, According to the formula Donny Peterson uses, your HP should be around 93+ HP @ 5500 RPM's.
Is that with a carb or EFI? Because that's 2-5hp right there. I've never dyno tuned either.
__________________
05 1200/1250C/Hammer 570 Cams/E1 clutch kit
TC88A Gunner's V00D00 map/DCPR7E/Taylor Pro 8mm
S&S Premium Lifters/KhromeWerks HP Plus 3" slip ons
HSR42 25 pilot 2 turns Y6 needle jet 97 needle 3rd groove 170 main
Dragtron II AC K&N filter/VR1 20W50/Spectro 85wt Primary Oil

Reply With Quote
  #83  
Old 4 Weeks Ago
Toejam503's Avatar
Toejam503 Toejam503 is offline
Air-Cooled Forever
 
Join Date: May 2010
Location: Dakota Territory
Posts: 2,615
Sportster/Buell Model: XL 1200 C
Sportster/Buell Year: 2006
Sportster/Buell Model #2: (Prev.Own)XLH Milw.Spec.
Sportster/Buell Year #2: 1981
Reputation: 4838891
Toejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond repute
Default

FI or carb isn't figured into the formula. RPM divided by 5252 times ft.lbs. of torque.

Reply With Quote
  #84  
Old 4 Weeks Ago
60Gunner's Avatar
60Gunner 60Gunner is offline
Chief of Security
 
Join Date: Sep 2017
Location: United States
Posts: 1,920
Sportster/Buell Model: 1200/1250C
Sportster/Buell Year: 05
Reputation: 2195891
60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute
Default

So what you're saying is 5500rpm ÷ 5242 = 1.0472 X 80ft.lbs. = 83.777hp

The chart I penciled in is approximate as I was going by memory and only had the peak numbers wrote down.
Maybe the torque was 81 at 5500 which would put the HP more like 85 at 5500 and the 86+ came slightly later.
But your 93hp at 5500 would be more like 90ft.lbs.

Last edited by 60Gunner; 4 Weeks Ago at 23:32..
Reply With Quote
  #85  
Old 4 Weeks Ago
SportyHD SportyHD is offline
Biker
 
Join Date: Mar 2019
Posts: 23
Sportster/Buell Model: Nightster
Sportster/Buell Year: 2008
Reputation: 10
SportyHD is an unknown quantity at this point
Default

Yea, think I’m gonna bite the bullet and see what the rush’s will do. It currently pulls hard down low but the dies offs up top (as seen on dyno sheet, thanks for posting!). If I could keep the torque down low but get better top end with the rush, I think I’ll be happy. At least till I get bored and want to make it a monster
Reply With Quote
  #86  
Old 4 Weeks Ago
Toejam503's Avatar
Toejam503 Toejam503 is offline
Air-Cooled Forever
 
Join Date: May 2010
Location: Dakota Territory
Posts: 2,615
Sportster/Buell Model: XL 1200 C
Sportster/Buell Year: 2006
Sportster/Buell Model #2: (Prev.Own)XLH Milw.Spec.
Sportster/Buell Year #2: 1981
Reputation: 4838891
Toejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond reputeToejam503 has a reputation beyond repute
Default

Quote:
Originally Posted by 60Gunner View Post
So what you're saying is 5500rpm ÷ 5242 = 1.0472 X 80ft.lbs. = 83.777hp

The chart I penciled in is approximate as I was going by memory and only had the peak numbers wrote down.
Maybe the torque was 81 at 5500 which would put the HP more like 85 at 5500 and the 86+ came slightly later.
But your 93hp at 5500 would be more like 90ft.lbs.
I thought I saw 89.6 or something on your dyno chart. (post#59)
5500/5252 x 80ft.lbs = 83.7
It's still awesome!

Last edited by Toejam503; 4 Weeks Ago at 04:39..
Reply With Quote
  #87  
Old 4 Weeks Ago
SportyHD SportyHD is offline
Biker
 
Join Date: Mar 2019
Posts: 23
Sportster/Buell Model: Nightster
Sportster/Buell Year: 2008
Reputation: 10
SportyHD is an unknown quantity at this point
Default

And don’t get me wrong, the new setup is way fun and gobs more that the previous stage 1 only. The bobcat IMO looks and sounds amazing and is one of the nicest built exhausts I’ve owned be it motorcycle or car. I just can’t leave anything alone and am always curious what another combo would do so I feel the rush’s are worth a try for a good comparison....at the expense of dyno time.

60Gunner, my apologies if I hijacked your thread but i appreciate you bouncing ideas around.
Reply With Quote
  #88  
Old 4 Weeks Ago
60Gunner's Avatar
60Gunner 60Gunner is offline
Chief of Security
 
Join Date: Sep 2017
Location: United States
Posts: 1,920
Sportster/Buell Model: 1200/1250C
Sportster/Buell Year: 05
Reputation: 2195891
60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute60Gunner has a reputation beyond repute
Default

Hey, no problem. You didn't hijack anything.

Toejam, my max torque is more around 4500 and looking at my scribbling it's actually 88.7. Its on its way back down by 5500 and somewhere around 80 or 81. Max HP was right around there at 86.8 so probably more like 81. Yeah I'm happy with the results. It not the peak HP numbers but more the power earlier that I was interested in and that's what I got with my max being at 5500rpm.

Last edited by 60Gunner; 4 Weeks Ago at 15:52..
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Sponsored Links
All times are GMT +1. The time now is 04:01.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC