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post #1 of 13 (permalink) Old 11-12-2015, 02:06 PM Thread Starter
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horse of another color

I have been given a 2004 Victory Kingpin bike and it has straight slasher pipes on it. They are stinking loud and I want to put a Silencer Insert in the pipes. I know this isn't a VN but you guys have had the best answers to all my problems I figured y'all would know this answer.

If I put a silencer in the pipes will that mess with my jetting?

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post #2 of 13 (permalink) Old 11-12-2015, 02:15 PM
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Most likely.every one I've seen is very restrictive

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post #3 of 13 (permalink) Old 11-12-2015, 02:37 PM
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it may not be as bad as you think.

I dont know, but is the 2004 victory fuel injected?? if so, the fuel management computer may compensate for the increased backpressure.

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post #4 of 13 (permalink) Old 11-12-2015, 03:06 PM Thread Starter
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yeah I realized later that I didn't mention that the bike is fuel injected and thought the same thing about it compensating for the resistance.

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post #5 of 13 (permalink) Old 11-12-2015, 10:39 PM
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Back pressure on the exhaust will increase the low end grunt.
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post #6 of 13 (permalink) Old 11-13-2015, 05:55 AM
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Back pressure on the exhaust will increase the low end grunt.
you've got to love "low end grunt"! lol

if it goes vroom or boom, I LIKE IT!
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post #7 of 13 (permalink) Old 11-13-2015, 08:35 AM
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if the fuel injection system is 'closed loop' meaning it has O2 sensor(s) in the exhaust stream, it should compensate without issues.. if its 'open loop' (no sensors in exhaust), it might need to be recalibrated/tuned

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post #8 of 13 (permalink) Old 11-13-2015, 10:39 AM
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My first question is, who gives someone a motorcycle? You have a better quality of friends or family than I do. That's apparent.

But to address the question at hand Chuck is right. My 1500 came with Cobra Speedster Shorts on it and it was wide open and obnoxiously loud. I put some generic short baffles in it and no retuning required even when wrapped with fiberglass packing. I blew one of those out of it while I was with Chuck and Old Dog when I backed out of the throttle hard. I noticed it sounded odd but was not aware it had happened at the time.

Long story short I ordered a set of Cobra Baffles Specific to the pipes ,they come in quiet and regular. I put the quiet ones in and still wonder how loud the others would be if these are called"quiet". Same story on the tuning, nothing had to be changed. The FI system is an open loop with no O2 sensor.

When I opened up the intake side I did put a fuel management system on it If it already has an open air intake , so it can suck more air in and out more out you will probably have to do so too.

Stock air setup and adding the baffles from the pipe manufacturer , I wouldn't worry about it, it should be fine either way.

That's just my experience but it should give you some idea of what you want to do , although I would buy the right baffles for the pipes , it's a lot easier. You can afford the baffles after all someone gave you a bike, lucky dog




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post #9 of 13 (permalink) Old 11-16-2015, 07:39 PM
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Quote:
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Back pressure on the exhaust will increase the low end grunt.
not really. the term back pressure is wrong. It all has to do with the speed of the exhaust gasses. Oddly enough in the case of the vulcan with proper jetting VERY little is lost down low with straight pipes if you tie them back together to take advantage of the scavenging effect. . . . .

but yes any change in exhaust restriction will require adjustment to either jets or ECU

for example going from the stock baffle to a full open exhaust on my ZRX takes me from an overly rich condition to a boardline lean condition. Once I put in a competion baffle it should be just right. (Much less restrictive than the stock one but still something in the pipe. 2 inch hole vs 1.5.)


All this being said it won't make any difference if the major flow restriction for the engine is elsewhere, (either stock air box / carb size)

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post #10 of 13 (permalink) Old 11-16-2015, 08:48 PM
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Richard...I had straight pipe on my 1500 when I got it. Very loud...awesome...but loud. I bought some generic short baffles on eBay and they take some of he noise and sharpness out. I think I spent $16.

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Previous bike: 2002 Vulcan 750
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