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GTM V7 III & V9 Exhaust options & Dyno runs

Discussion in 'V7/V85/V9 Chat & Tech' started by GT-Rx®, Apr 25, 2017.

  1. GT-Rx®

    GT-Rx® Administrator Staff Member

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    GT options for the V7 III. Mufflers or Full 2:2 & 2>1 systems. My offerings available on the Store tab above.

    GP-Style Meg Muffler:
    [​IMG]



    Prototyping our full Classic system also;
    [​IMG]

    Stubby option (contact us for details):
    IMG_0693.JPG

    Weight comparo...
    OEM muffler 10.8 lbs
    IMG_0704.JPG
    GT-Rx® Long Meg 2.6 lbs
    IMG_0705.JPG
     
    scudracer, MOLT, Bobby and 1 other person like this.
  2. Poppe

    Poppe Cruisin' Guzzisti

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    I know this is regarding the III, but will that first muffler be considered the new stubby? And will it be a part of the 2:1?
     
  3. GT-Rx®

    GT-Rx® Administrator Staff Member

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    No, the one shown is 12" long. The stubby mufflers are 6" long. It does not fit the 2>1.
     
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  4. Poppe

    Poppe Cruisin' Guzzisti

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    Oh copy! It's deceivingly 12" ha. It's really beautifully crafted. Will it replace the 2:1 "Meg" then? Apologies if it's a dumb question.
     
  5. Poppe

    Poppe Cruisin' Guzzisti

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    Thank you! Would love to see the photos when you get them.

    So this is called the Shortly Muffler right? Would it work on a V7 I or will this be a VIII only. Pretty sure I should be able to do the 2:1 in July and was going to do the Meg, but depending on how this works, I might do the "Shorty" now! It seems like it would be a middle ground between the stubby and the meg on the 2:1?
     
  6. GT-Rx®

    GT-Rx® Administrator Staff Member

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    Welcome.
    I call the 12-in meg "Stinger."
    We can call this the 'Shorty' for now. The Shorty will work on the I, II or III, and/or as the mufflers on the 2:2, in place of the Stubbies or Stingers. My standard (long) megs are 18-in.
    I am also custom building a big/cone muffled meg 2:2. Pics soon as well.
     
  7. Poppe

    Poppe Cruisin' Guzzisti

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    Ha! Good to know. How is the sound on this one vs the Meg or Stub? Will you do a dyno run for this?
     
  8. GT-Rx®

    GT-Rx® Administrator Staff Member

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    Internally it's the same as the 12" Stinger. The Stubby is no muffler at all. I will likely be dyno-ing everything, yes.
     
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  9. Poppe

    Poppe Cruisin' Guzzisti

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    Great. Thanks for all the information. I am only a few hundred miles away from my 5K service, so maybe I'll be able to see it in person when I can get a weekend free to schedule the service with your gang.
     
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  10. GT-Rx®

    GT-Rx® Administrator Staff Member

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    Below is the new big/cone muffled meg. I will be finalizing it in high-temp black, with a brushed tip. I'll post more info as I have it. I will be offering this design on a 2>1 soon.

    IMG_0854.JPG
     
  11. rupert8s

    rupert8s Just got it firing!

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    Sounds like a good plan. Would love to hear the sound of your new muffler.
     
  12. Bobby

    Bobby Tuned and Synch'ed GT Famiglia

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    Great looking work as usual Todd.
     
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  13. socalrob

    socalrob Tuned and Synch'ed

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    Like that, but also like the fact the double wall pipes on the V7iii will stay nice looking. I guess I am getting tired of the stainless pipes on my BMW turning to shite brown. Both chrome and titanium turn nice colors, stainless not.

    Any idea how much weight savings for the full system? Are you keeping the cross-over? Also, just looking at my bike it sure looks like the pipe would touch down before the peg feelers. If so I could see a higher pipe or lower pegs (I would like an extra bit of leg room).
     
  14. GT-Rx®

    GT-Rx® Administrator Staff Member

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    All details here; https://www.guzzitech.com/store/product/gt-rx-v7-full-ss-2-2/ - yes I keep the crossover (very important for power). The pipes do not touch down. Pegs/kickstand are first. I design from my extensive racing background.
     
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  15. rupert8s

    rupert8s Just got it firing!

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    Would love to see the dyno result. Keep us posted.
     
  16. GT-Rx®

    GT-Rx® Administrator Staff Member

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    We ran our 7-mile V7 III Stone yesterday on the dyno with stock mufflers, then my GT-Rx® GP-Megs - both on stock fueling. The graph (while really worthless to show real-world gains, as it's full throttle/peak power - where no one lives for long), shows a favorable gain the mid-range, and I'm positive when the fueling is corrected (coming soon), will show more gains everywhere, including peak power. Seat of pants riding the two back to back gives impressive gains from off idle up as is. Great to see ~9 hp gain at the rear tire over the last gen V7 I & II from the factory with the new head.
    Also below is a sound video (worthless too, but everyone always asks). The mufflers got plenty of smiles and thumbs up from everyone in the complex where GT Moto/Fab & Svc is.
    If interested in a set, ping me direct email; Todd at GuzziTech.com - or I'll of course post a link when I have them ready to ship. I suspect like everything else I offer, I'll sell one or two pair while everyone jumps on board with the bigger name brands and zero documentation on what they offer, and best to you on longevity. ;)



    Stock (green lines) vs. GT-Rx® GP-Megs (red) -- both on stock fueling.
    GT-V7III-Dyno.jpeg
     
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  17. lucydad

    lucydad Cruisin' Guzzisti GT Famiglia

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    Todd,

    Great work and thanks for posting results! Still waiting for details on a new V7 III Special here in Houston, TX. My "seat of pants" gauge estimated about ten hp gain between my 2012 V7R 2TB heron head and the 2017 Stone. Dropping weight on any bike is always a goal for performance too--per your new cans. I am staying tuned....bad pun. I think the new engine is quite an advance.
     
  18. GT-Rx®

    GT-Rx® Administrator Staff Member

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    Our GT-Rx® GP Megs will fit all V7 III& V9 models... including the V7 Racer high mounts in pic on bottom (full Racer system shown including hanger/peg) brackets. Taking pre-orders soon. Also very cool when the designer of the V7, Miguel, likes what you're doing too.

    IMG_1083.jpg
     
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  19. GT-Rx®

    GT-Rx® Administrator Staff Member

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    Our full system for when the headers start cracking at the H-pipe crossover like the 1400 does... Same poor design flaws. Will fit stock mufflers, or aftermarket including my GP Megs as shown. My design also has proven gains in power over the stock headers. Will be available brushed stainless, black coated or polished.

    IMG_1056.JPG
     
  20. lucydad

    lucydad Cruisin' Guzzisti GT Famiglia

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    Shipping yet? Waiting for my new V7 III Special, might be this week. These cans are an obvious addition. I assume remap also required, correct?
     

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