duals
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Cruiser
Joined: Feb 2012
Posts: 242
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From: atlanta
duals
Right now I've got stock header pipes and Rhinehart slip ons on my 12RK.
Question #1, is it a waste of time to even think of putting anything other than the RH header pipes in to get my true duals??
#2 What's the cause of loss of low end torque with true duals (or so I've read)?
#3 Anyone gone to duals that wish they would have stayed with stock headers?
Question #1, is it a waste of time to even think of putting anything other than the RH header pipes in to get my true duals??
#2 What's the cause of loss of low end torque with true duals (or so I've read)?
#3 Anyone gone to duals that wish they would have stayed with stock headers?
Tourer
Joined: Apr 2014
Posts: 485
Likes: 4
From: Kansas
Right now I've got stock header pipes and Rhinehart slip ons on my 12RK.
Question #1, is it a waste of time to even think of putting anything other than the RH header pipes in to get my true duals??
#2 What's the cause of loss of low end torque with true duals (or so I've read)?
#3 Anyone gone to duals that wish they would have stayed with stock headers?
Question #1, is it a waste of time to even think of putting anything other than the RH header pipes in to get my true duals??
#2 What's the cause of loss of low end torque with true duals (or so I've read)?
#3 Anyone gone to duals that wish they would have stayed with stock headers?
They might not sounds quite as good as the true duals however.
Truth be told, you can gain HP with true duals, but may lack some TQ.
Your *** dyno will never feel those small gains or losses.
Go with what you like.
How many 2/1 setups do you see on the dragstrip?
Your *** dyno will never feel those small gains or losses.
Go with what you like.
How many 2/1 setups do you see on the dragstrip?
Truth be told, you can gain HP with true duals, but may lack some TQ.
Your *** dyno will never feel those small gains or losses.
Go with what you like.
How many 2/1 setups do you see on the dragstrip?
Your *** dyno will never feel those small gains or losses.
Go with what you like.
How many 2/1 setups do you see on the dragstrip?
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
With a near stock Harley, power for TDs will be similar to any of the siamesed systems, but torque will be improved. I ran TDs on the bike in my sig pic for a while, before swapping to the Supermeg you see and had both set up on the dyno by the same shop.
Headline numbers were similar, with the 2-into-1 giving a little more peak torque, however the low/mid range torque was up to 15% higher with the Supermeg. In addition the engine is far smoother and just a lot nicer to ride. So there is more to the difference than meets the eye!
3. I never used stock headers with this S&S 107" engine, but no way will I go back to TDs.
4. I would expect your stock pipes, with suitable mufflers, to give better results than any TDs.
Last edited by grbrown; Jul 12, 2014 at 04:36 AM. Reason: Added para.
Seasoned HDF Member
Joined: Jun 2013
Posts: 10,858
Likes: 5,421
From: My own little slice of heaven
I just put true duals on last week.
My impressions:
Do not notice any difference in HP or Torque. As Safetyman said, your *** dyno won't notice. I ride solo
Throttle response is better.
Sound is much better, not louder.
Way less heat on my leg.
JMHO
My impressions:
Do not notice any difference in HP or Torque. As Safetyman said, your *** dyno won't notice. I ride solo
Throttle response is better.
Sound is much better, not louder.
Way less heat on my leg.
JMHO
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Road Warrior
Joined: Jan 2007
Posts: 1,415
Likes: 18
From: Belmont, MI
I tried V&H true duals several years ago and could not get them off fast enough. Maybe it was the mufflers I was running but it just felt like my head was being jack hammered.
Rick
Rick
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Thread Starter
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Cruiser
Joined: Feb 2012
Posts: 242
Likes: 0
From: atlanta
The loss of torque and HP is due to the lack of back pressure in a true dual setup. I am set to go with the new slimline duals by RH. According to the dyno guy I have talked to, they dyno the same as the Vance and Hines power duals.
They might not sounds quite as good as the true duals however.
They might not sounds quite as good as the true duals however.
I was thinking that "true" in true duals simply meant that the pipes didn't crossover, and were more like straight pipes.
I had assumed the RH slimline duals were "true duals". Anybody have a good source to read up on what I need to know before plunking down some pretty good cash? Appreciate it!