Cobra/Vance & Hines Slip-on Dyno Comparison - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 12 (permalink) Old 08-11-2012, 01:27 PM Thread Starter
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Cobra/Vance & Hines Slip-on Dyno Comparison

I hope this helps...

Here is a comparison of the H.P./torque increases over stock mufflers of those slip-ons performed on two totally stock Vaquero's on my dyno.


@1500 RPM......COBRA +1.2 HP/+4.4 PNDS ......V&H+1.3 HP/+4.5 PNDS

@2000 RPM......COBRA +.6 HP/+1.4 PNDS...........V&H +.7 HP/+1.6 PNDS

@2500 RPM......COBRA +2.1 HP/+4.5 PNDS...........V&H+2.2 HP/4.7 PNDS

@3000 RPM......COBRA +2.8 HP/+5 PNDS............V&H+3.7 HP/+6.4 PNDS

@3500 RPM......COBRA+3.2 HP/+4.7 PNDS..........V&H+4.5 HP/+6.7 PNDS

@4000 RPM......COBRA +2.2 HP/+2.8 PNDS..........V&H+4.4 HP/+5.7 PNDS

@4500 RPM......COBRA +2.4 HP/+2.9 PNDS ..........V&H+4.5 HP/+5.2 PNDS

@5000 RPM......COBRA +2.4 HP/+2.5 PNDS ..........V&H+4 HP/+4.2 PNDS

@5500 RPM ......COBRA 2.6 HP/+2.4 PNDS............V&H+2.6 HP/+2.4 PNDS

The Tri ovals are a far more restrictive slip-on as they do not have a straight thru core as does the V&H slip-ons. The V&H's are deffinately louder with more of a "bark", the Tri ovals are very mellow in comparison.

We just modified a Vaquero with the Tri-ovals, a BAK and PCV, we did not get the gains in peak power as I have seen due to the Tri-ovals restrictive design. My modified Cobra round slip-ons I had on last year with straight-thru baffles to replace the restrictive baffles that came with those slip-ons made more power thru the whole rpm range, these big twins need to BREATH!!

Bottom line, if you want an increase in power, both brands will do just that. It then comes down to cost, appearance, sound levels and how important the actual power increase over stock that is provided by each slip-on.

RACNRAY

"TRUE HAPPINESS IS IN THE HEART,NOT IN THE OUTSIDE FIXES!!"
WITH OVER 42 YEARS AS A MOTORCYCLE TECHNICIAN/HI-PO SHOP OWNER I AM A PURVEYOR OF FACT NOT FICTION!
"WE LIVE OUR LIVES IN CHAINS NEVER KNOWING WE HAD THE KEY"
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post #2 of 12 (permalink) Old 08-11-2012, 02:30 PM
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I knew I bought the right pipes and that proves it. The Vance and Hines do have a bark to them love them. Now I just news BAR and a dyno tune and I will be set. Thanks for the info Ray!


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2010 Voyager
Scootworks 2 inch fat risers
vance&Hines slipons
Mustang Wide Touring studded
PCV
Michelin commander 2
Ipod adapter
Titanium header wrap
8 to 12.5 inch bagger windshield
Iso grips with Rays throttle mod
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post #3 of 12 (permalink) Old 08-11-2012, 07:25 PM
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How much louder are the V&H than the Cobras? My bike came with the Cobra Billet Tip Slip-Ons from the dealer. I have no comparison to how much louder than stock they are or how much louder the V&H are on top of that.

Are the V&H noticeable louder than the Cobras? If I want louder, is it worth the money to switch or is the difference not enough to warrant spending the cash?
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post #4 of 12 (permalink) Old 08-12-2012, 12:33 AM
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pipes

My vance and hines are loud only when you get into the throttle hard. They are not annoying loud but the are really deep and throaty. I have never heard the cobras so I cant compare to them.

2010 Voyager
Scootworks 2 inch fat risers
vance&Hines slipons
Mustang Wide Touring studded
PCV
Michelin commander 2
Ipod adapter
Titanium header wrap
8 to 12.5 inch bagger windshield
Iso grips with Rays throttle mod
Chrome rear floor board covers
Kams Kit
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post #5 of 12 (permalink) Old 08-12-2012, 11:18 AM
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Quote:
Originally Posted by nnklem View Post
If I want louder, is it worth the money to switch or is the difference not enough to warrant spending the cash?
Only you can decide that.
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post #6 of 12 (permalink) Old 08-12-2012, 02:21 PM
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Am using the pcv map from pc website, for the set up I have right now. Is it better to dyno tune? Am planing on installing a air kit later and rays throttle mod

2012 Vulcan 1700 Nomad
Vance & Hines Twin Slash Slip-Ons
Power Commander V
Thunder Air Kit Stock
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post #7 of 12 (permalink) Old 08-12-2012, 05:46 PM
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Dyno tune is expensive but worth it. The bike will make more power and get better mpg. Auto tune cost about the same as a dyno tune. It's all what your choice is.


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2010 Voyager
Scootworks 2 inch fat risers
vance&Hines slipons
Mustang Wide Touring studded
PCV
Michelin commander 2
Ipod adapter
Titanium header wrap
8 to 12.5 inch bagger windshield
Iso grips with Rays throttle mod
Chrome rear floor board covers
Kams Kit
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post #8 of 12 (permalink) Old 08-12-2012, 07:52 PM
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Ray - Thanks for taking the time to post this up. Interesting to see how large a difference there is from 3-5k. Obvious the V&H flow a bit better if all other parameters are equal.

Also interesting to see how they peak out identically at 5500. Cool.

2011 Vaquero in Red
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post #9 of 12 (permalink) Old 08-13-2012, 10:39 AM
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Quote:
Originally Posted by new kawi rider View Post
Dyno tune is expensive but worth it. The bike will make more power and get better mpg. Auto tune cost about the same as a dyno tune. It's all what your choice is.


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I been reading the ups and downs of the auto tune trying to weigh out if the cost is worth the auto tune. Thank you for info!!!

2012 Vulcan 1700 Nomad
Vance & Hines Twin Slash Slip-Ons
Power Commander V
Thunder Air Kit Stock
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post #10 of 12 (permalink) Old 08-13-2012, 10:52 AM Thread Starter
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Quote:
Originally Posted by nnklem View Post
How much louder are the V&H than the Cobras? My bike came with the Cobra Billet Tip Slip-Ons from the dealer. I have no comparison to how much louder than stock they are or how much louder the V&H are on top of that.

Are the V&H noticeable louder than the Cobras? If I want louder, is it worth the money to switch or is the difference not enough to warrant spending the cash?
The slip-ons you have, the round bodied ones are very quiet, quieter than the Tri-Ovals and the V&H. I had those exact s/on's on my skoot and was not happy with the sound and the performance until I removed a restrictor plate from the baffle, then they were ok. They are better than stock, and louder also.

RACNRAY

"TRUE HAPPINESS IS IN THE HEART,NOT IN THE OUTSIDE FIXES!!"
WITH OVER 42 YEARS AS A MOTORCYCLE TECHNICIAN/HI-PO SHOP OWNER I AM A PURVEYOR OF FACT NOT FICTION!
"WE LIVE OUR LIVES IN CHAINS NEVER KNOWING WE HAD THE KEY"
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