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[PMG1]

  I have a new Black/Orange SE Ultra and had the SERT, K&N air installed along with Rush 1.75 slip ons. On the first dyno we reached around 85 hp and 100 pounds of torque. One of the major issues I had was a cosmetic issue that doesn't allow the heat shields to wrap around the head pipe far enough (the O2 sensor is the cause) and the pipe "BLUE" was reflecting against the chrome and it was badddd. So after some research the dealer installed V&H True Dual Headpipes (the shields wrap very well) and kept the Rush pipes keeping the 1.75 baffle on the left side and put the 2.00 baffle on the right everything is great but the dyno numbers are "Way Off" we lost 7 to 8 hp and around 15 # of torque. Any ideas before we put it up for sale. I would like 90 hp and 110 # of torque.

[RedDevil]

I have a new Black/Orange SE Ultra and had the SERT, K&N air installed along with Rush 1.75 slip ons. On the first dyno we reached around 85 hp and 100 pounds of torque. One of the major issues I had was a cosmetic issue that doesn't allow the heat shields to wrap around the head pipe far enough (the O2 sensor is the cause) and the pipe "BLUE" was reflecting against the chrome and it was badddd. So after some research the dealer installed V&H True Dual Headpipes (the shields wrap very well) and kept the Rush pipes keeping [highlight]the 1.75 baffle on the left side and put the 2.00 baffle on the right [/highlight]everything is great but the dyno numbers are "Way Off" we lost 7 to 8 hp and around 15 # of torque. Any ideas before we put it up for sale. I would like 90 hp and 110 # of torque.

I'm no expert in this field, but why did they go with different sized baffles after shifting to the true duals?[smiley=nixweiss.gif]   To me that's opening up the front jug more than the rear...that doesn't make sense to me.  [smiley=nervous.gif]

[Midnight Rider]

I have a new Black/Orange SE Ultra and had the SERT, K&N air installed along with Rush 1.75 slip ons. On the first dyno we reached around 85 hp and 100 pounds of torque. One of the major issues I had was a cosmetic issue that doesn't allow the heat shields to wrap around the head pipe far enough (the O2 sensor is the cause) and the pipe "BLUE" was reflecting against the chrome and it was badddd. So after some research the dealer installed V&H True Dual Headpipes (the shields wrap very well) and kept the Rush pipes keeping the 1.75 baffle on the left side and put the 2.00 baffle on the right everything is great but the dyno numbers are "Way Off" we lost 7 to 8 hp and around 15 # of torque. Any ideas before we put it up for sale. I would like 90 hp and 110 # of torque.

I too would question putting on two different sized baffles on the bike...also, I'm assuming that the bike was completely retuned after the TD's were installed, and each cylinder was tuned seperately prior to the Dyno pull?

[hd-dude]

Different size baffles on true duals does not make sense to me either [smiley=nixweiss.gif]. I would be asking lots of questions as to why they would do this. The numbers you are expecting 90+ HP and 110 tq has been typical for the stage 1 ac and free flowing exhaust.

[RedDevil]

I have a new Black/Orange SE Ultra and had the SERT... Any ideas before we put it up for sale.

I'm hoping in that statement you mean putting the exhaust up for sale and not the bike?   [smiley=confused5.gif]Putting the bike up for sale because of an exhaust issue is a little extreme.  Just replace the left baffle (or right) and make them equal, or buy Vance and Hines mufflers (or Rinehart slip ons) for those true duals and have it re-tuned.  [smiley=xyxthumbs.gif]

[RJ749]

I would also be quetioning the ability of the dyno guy, unless you know from experience that he knows what he is doing.

We've seen widely varying results based on who ran the dyno.  JUst because they have the equipment doesn't guarantee a correct result.

[JDOFLHRIDER]

IT LOOKS LIKE THEY MIGHT HAVE BEEN  TRYING A TRICK FOR STOCK PIPES AND WHEN THEY WENT TO DUALS THEY DIDN'T FIX TRICK. I PUT A D-D FATCATS ON MINE LOVE SOUND ,FIT AND FINISH,AND DYNO #,RIDEABILITY IS GREAT.RIDE SAFE JDO

[RedDevil]

IT LOOKS LIKE THEY MIGHT HAVE BEEN  TRYING A TRICK FOR STOCK PIPES AND WHEN THEY WENT TO DUALS THEY DIDN'T FIX TRICK. I PUT A D-D FATCATS ON MINE LOVE SOUND ,FIT AND FINISH,AND DYNO #,RIDEABILITY IS GREAT.RIDE SAFE JDO

I'm not really sure what they were trying to do by putting a more restrictive muffler on the already more restricted side...unless they were trying to diverty more air flow to the right muffler...In that case why not just do the "hillbilly" mod?  I'm not sure I'd go back to that dealership and look for someone else...
Red

[grc]

I have a new Black/Orange SE Ultra and had the SERT, K&N air installed along with Rush 1.75 slip ons. On the first dyno we reached around 85 hp and 100 pounds of torque. One of the major issues I had was a cosmetic issue that doesn't allow the heat shields to wrap around the head pipe far enough (the O2 sensor is the cause) and the pipe "BLUE" was reflecting against the chrome and it was badddd. So after some research the dealer installed V&H True Dual Headpipes (the shields wrap very well) and kept the Rush pipes keeping the 1.75 baffle on the left side and put the 2.00 baffle on the right everything is great but the dyno numbers are "Way Off" we lost 7 to 8 hp and around 15 # of torque. Any ideas before we put it up for sale. I would like 90 hp and 110 # of torque.

I'm no expert in this field, but why did they go with different sized baffles after shifting to the true duals?[smiley=nixweiss.gif]   To me that's opening up the front jug more than the rear...that doesn't make sense to me.  [smiley=nervous.gif]

PMG,

The smaller baffle on the left side only makes sense with the original H-D headpipes (similar to the Hooker tunable mufflers, with the left side set on "Torque" and the right side on "HP").  Once you went to the True Duals, they should have gone back to the same size baffle on both sides.  The 1.75" will be quieter, of course, and will also fatten up the torque curve at low speeds while suppressing the max numbers at higher speeds.  The larger baffles will have the opposite affect, losing some torque on the bottom but gaining some at higher speeds.  It becomes a balancing act between sound levels and desired torque curve characteristics.  

BTW - 85/100 SAE is good for stock numbers, but with a high flow air cleaner and low restriction exhaust you should be in the 90⁺/110⁺ range (based on results from others on this site).  Methinks your tuner isn't quite up to par.

Jerry

[Jester_Red07]

I'm not really sure what they were trying to do by putting a more restrictive muffler on the already more restricted side...unless they were trying to diverty more air flow to the right muffler...In that case why not just do the "hillbilly" mod?  I'm not sure I'd go back to that dealership and look for someone else...
Red

 It would Divert nothing on a TD system

[RedDevil]

 It would Divert nothing on a TD system

You're absolutely right on the true duals...I was questioning putting the more restrictive muffler on the stock cross-over head pipes.

[PMG1]

I will have to call the dealer back next week to get the answer you guys are looking for as far as exact reasoning (you guys know your stuff, most of it was foreign to me) for the different baffles but we were in contact with a few people one being V&H, along with the owner of Rush, and a HP Harley dealer in Charlotte (those NC guys know a thing or two about engines) that has used this exact setup on some 07 CVOs and they are getting unreal performance numbers with this setup. My understanding was to slow down the exhaust on the left side so that the exhaust would exit at the same time on the right side (ex: left side create back pressure right side a little more free flowing to exit at the same time) Let me give these guys a few days to get settled in after the New Years and I will get them to post on the issue. Could be the DYNO technician but these are major players in the HD business but we are learning about these 110's as we go. I will also get the Dyno sheets from before the changes and after so you guys can see the curves. Thanks for the help just learning

[RedDevil]

I will have to call the dealer back next week to get the answer you guys are looking for as far as exact reasoning (you guys know your stuff, most of it was foreign to me) for the different baffles but we were in contact with a few people one being V&H, along with the owner of Rush, and a HP Harley dealer in Charlotte (those NC guys know a thing or two about engines) that has used this exact setup on some 07 CVOs and they are getting unreal performance numbers with this setup. [highlight]My understanding was to slow down the exhaust on the left side so that the exhaust would exit at the same time on the right side [/highlight](ex: left side create back pressure right side a little more free flowing to exit at the same time) Let me give these guys a few days to get settled in after the New Years and I will get them to post on the issue. Could be the DYNO technician but these are major players in the HD business but we are learning about these 110's as we go. I will also get the Dyno sheets from before the changes and after so you guys can see the curves. Thanks for the help just learning

Interesting approach...If that were the case, why not go with the Bassani headers which are physically the same length.  It sounds good, but I'm not smart enough in this area to say that's a winner of an approach.  

Red

[bikerdude]

First problem is V&H PIPES. I HAVE THE SAME BIKE WITH RINHART TRUE DUALS WITH A MILD CAM. I am getting 99hp and 113 tq. I got rid of the Harly junk oil and went with ams oil and the bike runs cool and no trans noise.

[RedDevil]

[highlight]First problem is V&H PIPES.[/highlight] I HAVE THE SAME BIKE WITH RINHART TRUE DUALS WITH A MILD CAM. I am getting 99hp and 113 tq. I got rid of the Harly junk oil and went with ams oil and the bike runs cool and no trans noise.

I hate to disagree with you on that, but I have the same bike with the V&H duals, V&H Ovals, SEAC, and SERT, with stock cams and am getting 86+hp and 107+torque.  I think it's the guy tuning the bike.
Cheers [smiley=xyxthumbs.gif],
Red