True dual loss of torque, put to bed!!!!
Thread Starter
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Road Captain
Joined: Jan 2006
Posts: 508
Likes: 14
From: Tallahassee
True dual loss of torque, put to bed!!!!
06 EG standard (now Doug custom). Bone stock 61 hp and 70 ft lb tq, carb bike. Installed Bubs cross dresser duals, and Rush mufflers with 2.5 inch baffels.
Hp is now 68 and 79 ft lb torque. 70 ft lb torque at 2300 rpm, holds over 70 until 5k. Gas milage did not change, still averaging 45.
Same dyno and operator, runs were about a month and 1000 miles apart. Weather was the same, lower 90s, 90 something humidity (ya Im in Florida).
Still running stock air filter. Only changes to carb was idle mix adjustment. With a free flowing air filter and jet kit the numbers should get even better.
Anyway, the purpose of this post is to dispell the mith that true duals kills torque. The dyno does not lie.
Ride safe,
Doug
PS: pic is before exhaust change
Hp is now 68 and 79 ft lb torque. 70 ft lb torque at 2300 rpm, holds over 70 until 5k. Gas milage did not change, still averaging 45.
Same dyno and operator, runs were about a month and 1000 miles apart. Weather was the same, lower 90s, 90 something humidity (ya Im in Florida).
Still running stock air filter. Only changes to carb was idle mix adjustment. With a free flowing air filter and jet kit the numbers should get even better.
Anyway, the purpose of this post is to dispell the mith that true duals kills torque. The dyno does not lie.
Ride safe,
Doug
PS: pic is before exhaust change
Banned
Joined: Nov 2005
Posts: 3,499
Likes: 2
From: CANADA
RE: True dual loss of torque, put to bed!!!!
Ya don't have to convince me, now you'll see how much more fun the bike can be. Why no high flow air kit? Nice clean bike BTW, got that Streetglide look goin' on.[
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Road Warrior
Joined: Mar 2005
Posts: 1,379
Likes: 2
From: Central, NY
RE: True dual loss of torque, put to bed!!!!
It's nice to see some numbers posted with respect to the various modifications people make. It keeps the emotion out of the discussion.
Good luck with the bike, looks great.
Good luck with the bike, looks great.
Outstanding HDF Member
Joined: May 2006
Posts: 3,273
Likes: 7
From:
RE: True dual loss of torque, put to bed!!!!
You're not running straight pipes, you have baffles that break up reversion in the exhaust. There is a difference. You can get even better performance using 2 into 1 and baffled. but it looks funny on a bagger. Something about duals on a bagger.
Banned
Joined: Nov 2005
Posts: 3,499
Likes: 2
From: CANADA
RE: True dual loss of torque, put to bed!!!!
Hey Greg, ya never know, maybe you'll get converted and pull the trigger on a set, one of these days. Hardest part is getting the stockers off. Gotta love the daily entertaining dual threads!
Cruiser
Joined: Jun 2006
Posts: 188
Likes: 7
From: Cincinnati, Ohio, USA
RE: True dual loss of torque, put to bed!!!!
ORIGINAL: sleepneagle
You're not running straight pipes, you have baffles that break up reversion in the exhaust. There is a difference. You can get even better performance using 2 into 1 and baffled. but it looks funny on a bagger. Something about duals on a bagger.
You're not running straight pipes, you have baffles that break up reversion in the exhaust. There is a difference. You can get even better performance using 2 into 1 and baffled. but it looks funny on a bagger. Something about duals on a bagger.
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Tourer
Joined: Dec 2005
Posts: 401
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From:
RE: True dual loss of torque, put to bed!!!!
I like my 2 into 1 on my street glide. I like the look, the sound, the performance, and my left bag stays nice and cool!!!
[IMG]local://upfiles/6262/B121C9F2B918470D9F70E2533E1690B7.jpg[/IMG]
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Thread Starter
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Road Captain
Joined: Jan 2006
Posts: 508
Likes: 14
From: Tallahassee
RE: True dual loss of torque, put to bed!!!!
My post is by no means slamming 2 into 1 pipes. If you got that impression I apologize. There is no dout that a performance 2 into 1 exhaust system will make more power and torque than true duals.
My point is that most people running the stock exhaust head pipes that do not want to go to a 2 into 1 were afraid that if they swapped to a true dual setup (from factory bagger duals) would loose torque. These dyno runs prove that no power is lost when going from a stock dual to a true dual setup. Actually both HP and TQ go up.
Thats all I'm saying. This has nothing to do with a performance 2 into 1 exhaust system.
BTW 100thrk, I made the topic of the post very specific. If you are tired of "true dual" posts, why open it? Daahhhaaa!
Bountyhunter, just havent had time for the AC and carb tuning. Doing that this weekend. Thanks for your input, always appreciated.
Knees in the breeze,
Doug
My point is that most people running the stock exhaust head pipes that do not want to go to a 2 into 1 were afraid that if they swapped to a true dual setup (from factory bagger duals) would loose torque. These dyno runs prove that no power is lost when going from a stock dual to a true dual setup. Actually both HP and TQ go up.
Thats all I'm saying. This has nothing to do with a performance 2 into 1 exhaust system.
BTW 100thrk, I made the topic of the post very specific. If you are tired of "true dual" posts, why open it? Daahhhaaa!
Bountyhunter, just havent had time for the AC and carb tuning. Doing that this weekend. Thanks for your input, always appreciated.
Knees in the breeze,
Doug
Tourer
Joined: Dec 2005
Posts: 401
Likes: 0
From:
RE: True dual loss of torque, put to bed!!!!
I didn't think you were slamming 2 into 1. I had true duals on my road king and really liked them. And yes duals over stock anytime. I just like to run my fingers about my supertrapp!! A cool left bag....think about it.