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Old 12-18-2010, 03:10 PM   #1 (permalink)
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Supertrapp: 2-1 Supermeg vs 2:2 Fatshots

Thinking about one of these, especially most recent dyno shows I am leaving a lot of horsepower on the table with the V&H Double Barrels: only 76 horsepower and 96 ft lbs.

Anyway, the fatshots maintain the 2:2 shotgun look, but is there a difference in performance between the two? Even using the disc technology, will the 2:1 still be the better performer? The 2-1 pipe is about $160 cheaper...$600 to $760 for the fatshots.

Merry Xmas to all.

Tim
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Old 12-18-2010, 03:28 PM   #2 (permalink)
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Could only guess at exact numbers. Generally speaking though, you gain area under the torque curve, especially on it's left side, with a good 2:1 pipe. This makes for a stronger low end, generally in the 2000-3000 RPM range. You do lose a little hp in the upper RPM range though with a 2:1. Again this is a broad generalization. To me, the 2:1 is the choice for anyone who is riding a stock or mildly built street bike, especially a bagger, precisely due to the definite increase in low end torque.
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Old 12-20-2010, 07:51 AM   #3 (permalink)
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The 2:2 FatShots with the large diameter head pipes will give you more in upper mid-top, the 2:1 will be a better bottom-mid.
Exactly as Guy said, your bike/build the 2:1 is probably the better choice.
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Old 12-21-2010, 04:03 AM   #4 (permalink)
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JTW - I assume the 2:1 is a better choice due to the scavenging effect by both pipes.

Yet, with the discs, cannot the fatshots be adjusted to enhance the bottom end?

Just trying to understand all this.

TIA

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Old 12-21-2010, 07:52 AM   #5 (permalink)
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Quote:
Originally Posted by Friedenfels View Post
JTW - I assume the 2:1 is a better choice due to the scavenging effect by both pipes.

Yet, with the discs, cannot the fatshots be adjusted to enhance the bottom end?

Just trying to understand all this.

TIA

Oz
Tim- that makes two of us!! Thanks for asking some good questions. I'm learning too! YR
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Old 12-21-2010, 12:31 PM   #6 (permalink)
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JTW - I assume the 2:1 is a better choice due to the scavenging effect by both pipes.
Correct, and the smaller diameter primary for better torque on the stock or mild motor.

Yet, with the discs, cannot the fatshots be adjusted to enhance the bottom end?
To a point yes, but the 2" diameter pipe is really the issue with the low end torque. They are great up top.

Just trying to understand all this.

TIA

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Old 12-21-2010, 04:38 PM   #7 (permalink)
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Ok, to take this a step further: Suppose a guy takes his stock to mild motor and moves up to a 103/106/107 (10:1-ish compression), some headwork, and maybe keeping the 204 cams or maybe an Andrews 54. Does the equation change at all, or is this still considered a mild motor and the 2:1 still the champ.

As you may have guessed, kinda leaning towards the fatshots because it keeps the 2:2 pipes.....not against a 2:1, but, well, you know. BUT....dont want to leave any "free" power on the table, especially given the 2:1 is cheaper.
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Old 12-27-2010, 05:56 PM   #8 (permalink)
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I have used both Rush slip on mufflers and a Supertrapp supermeg 2:1 exhaust on my Road King. The slip ons have a louder idle & louder cruise sound but the extra heat in my crotch got me to try the 2:1 Supertrapp. Ran the Supertrapp with 9 discs and open end cap and with 18 discs and closed end cap. The bike ran best with the closed end cap & 18 discs. It is not to loud when I am cruising and barks when I let it rip. I am going with the SuperTrapp Supermeg 2:1 on my 09 RG. The 09 currently has Woods TW6-6 cams, Rinehart mufflers, PCV & autotune with a 107 kit in the works. IMHO The ST 2:1 is the way to go and it can grow with my build. If you still arn't sure which way to go call Jamie at Fuelmoto, tell him what you have and what you want and he will shoot you straight.
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Old 12-28-2010, 09:41 AM   #9 (permalink)
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claydbal is reading this now saying WTF is this?
fatshots have no business on any motor. even if you had the cubic inch (over 117) , the cams (over 650 lift), and heads (over 3000) to make power in the area those pipes would begin to TRY to work, there are much better exhausts for the application.

bottom line? they are too big and tuned for no particular application.
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Old 12-28-2010, 01:41 PM   #10 (permalink)
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fatshots have no business on any motor. even if you had the cubic inch (over 117) , the cams (over 650 lift), and heads (over 3000) to make power in the area those pipes would begin to TRY to work, there are much better exhausts for the application.

bottom line? they are too big and tuned for no particular application.
Yes, intended for bigger motor, but they work very well, maybe try them next time you're on the dyno?
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Old 12-29-2010, 07:59 AM   #11 (permalink)
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Yes, intended for bigger motor, but they work very well, maybe try them next time you're on the dyno?
no need for next time. clamping straps across the outlets will show a torque gain and more area under the curve. been there.
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