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Discussion Starter · #1 ·
was wondering if there was a way you could mod the stock muffler to get some better sound. I dont care for how it looks and its def going to get changed on my bike but i want it to sound better while im deciding what exactly to do for pipes (i feel like a woman trying to pick shoes, one day i like swept the other like vyper2, next like the reaper...), and to buy time while i do my light mods. Im talking a little modding of the muffler just for better sound street tuning it then eventually when i see the pipes that i like looking at more often buying pipes then strapping it to my buddies dyno.

Still trying to figure out air intake possibilities too, want lower profile then the bubble on stock cover pushes out from the bike, considering hypercharger, or cone
 

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i have a stock cover i set up with straits if you are interested.
 

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Discussion Starter · #4 · (Edited)
nahh i could do straights and such easily, could even bend my own pipes and do my own baffle design, just cost of chrome around here is ludacris though and not too kean on powder coating pipes and the time it would take by hand is not worth it to me unless i figure out a sweet design and can get everything done relatively cheap and quickly. I mostly didnt know if punching it out or removing just some of the baffels caused it to run too crazy or provided too low of backpressure and would cause issues

I designed and built a muffler and header pipe for an FSAE car last year GSXR 600 motor on go-cart with certain noise constraints so it had to be Easily tuneable to keep best performance for weather and environmental conditions and not excede the Db limit.

Basicly wanted to be lazy and figure out how far i can tweek the stock pipes without issues till i could get a set i like
 

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Ummm, exhaust tips to replace the "muffler", you will still have the stock pipes attached... Such as RAW or the other manufacturer (can't think of the name atm...) But, if you want cheap, drilling the back with a unibit and reading the other articles that are in these forums would help as there are several in here :D If a little money buys you happiness, I suggest you go with tips as you can always switch back if you don't cut anything out of the ordinary from the stock pipes.
 

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.........unless i figure out a sweet design and can get everything done relatively cheap and quickly. I mostly didnt know if punching it out or removing just some of the baffels caused it to run too crazy or provided too low of backpressure and would cause issues.
imwright;

This subject has been done to death (search the threads), but here goes again. First, there is no such thing as "too low of back-pressure". Since you've had formal training in fluid dynamics, you have enough moxy to appreciate what the REAL experts in exhaust system design have to say:

RB Racing LSR 2-1 Exhaust Technology

Basically, if you're a pipe manufacturer/fabricator and you don't have an engineer on staff, then you're reduced to a lot of guesswork, blindly cutting, fitting, and trying, and praying that you can stumble onto something that works.

As far as modding your stock muffler, take it off, and using a 1-1/4 inch bi-metal hole saw and two extensions, bore, from the front, both upper and lower chambers, all the way back to the last partition. Then, after radially dressing down the high points to fit, lube-up a 1-1/2 inch bi-metal hole saw and, going through the two exit tubes, bore through the last partition. Mount a Cobra Fi2000 Fuel Controller (set to 1-2-1) and you're done. You'll love the sound (as good as any Harley around) and you'll immediately feel a boost in performance. If you already like the look of the stock pipes, you may even want to fore-go expensive after-market pipes, at least 'til you can afford them.

Cheers
 

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Discussion Starter · #7 ·
Barfury, theoretically there isnt a too low of backpressure situation, it does help to have the pressure for starting. With newer vehicles though EFI signals are read through exhaust and engine temps, Emmissions are read through exhaust, and the injector sizes are limited to certain flow rates without swapping them to bigger injectors. I just didnt know how acceptable it was, just got my bike from the dealer, gotta go ride.

Prettymuch too keep the whole domino chain from falling you gotta play around within certain margins. With Diff MFG's you can do certain extents of work before having to swap major parts and that is why i asked. I didnt see any posts that were Modding stock exhaust until someone politely pointed it out, but i hate the look of it so know i will change it eventually just want better sound now
 

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imwright;

".............theoretically there isnt a too low of backpressure situation, it does help to have the pressure for starting".
*****Please cite sources and documentation!

"With newer vehicles though, EFI signals are read through exhaust and engine temps, Emmissions are read through exhaust."

*****I'm sure that you're aware that there are NO sensors in the Fury exhaust system; NONE!

Cheers
 

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imwright;

If you'd like to see what the inside of the muffler looks like (before mod), here's a CAD sketch:
 

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imwright;



Please cite sources and documentation!

"With newer vehicles though, EFI signals are read through exhaust and engine temps, Emmissions are read through exhaust."

I'm sure that you're aware that there are NO sensors in the Fury exhaust system; NONE!

Cheers
Aye, car FI's and the Fury's FI, let alone any bike's FI is not the same. Most car's that have FI, auto adjust, where as the Fury's does not auto adjust... The FI on the Fury is just there as a more potent fuel delivery system and is more reliable at starting the bike than a none FI bike... well, as far as I know :p
 

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Aye, car FI's and the Fury's FI, let alone any bike's FI is not the same. Most car's that have FI, auto adjust, where as the Fury's does not auto adjust... The FI on the Fury is just there as a more potent fuel delivery system and is more reliable at starting the bike than a none FI bike... well, as far as I know :p
Redspawn;

Please correct me if I'm wrong, but I think the Fury's FI "auto-adjusts" for inlet air temperature, engine temperature, and barometric pressure (altitude). Is this not right?

Cheers
 

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Redspawn;

Please correct me if I'm wrong, but I think the Fury's FI "auto-adjusts" for inlet air temperature, engine temperature, and barometric pressure (altitude). Is this not right?

Cheers
Hmmm, now I'm confused from what I've heard about the Fury's FI... Clueless around? lol
 

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Discussion Starter · #13 ·
I havent had a chance to look through it, I know boat EFI systems just go off temp in the head and a temp sensor in the intake. Didnt know if they had an O2 somewhere in the heads or what they used to meter the engines characteristics to control the fuel mix. Im still learning alot about the bike, pretty much untill now i have been just trying to figure out how to make it look cooler and sound a little better
 

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The PGM-FI uses inputs from the IAT (intake air temp) , the MAP (manifold absolute pressure) , the ECT (engine coolant temp), and the TP (throttle position) sensors. The MAP sensor can (I don't know if it does on the Fury or not) monitor barometric only if the engine is not running. It adjusts for altitude because it is measuring the difference in pressure at the manifold.

"The MAP sensor measures the "absolute pressure" (not manifold vacuum) in the engine's intake manifold. The mass of air entering the engine is directly proportional to its density. Density is directly proportional to the air's absolute pressure, and inversely proportional to the air's absolute temperature."

By design the PGM-FI constantly adjusts the amount of fuel being fed to the engine, most people consider the "auto adjusting" something different and that requires an input from an O2 sensor in the exhaust, the US Furys do not have those sensors. This system only knows what is going in, not what comes out, that is why you need a fuel management system when you start changing intakes and exhaust, they are in the most basic example, a high tech jet kit.
 

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The PGM-FI uses inputs from the IAT (intake air temp) , the MAP (manifold absolute pressure) , the ECT (engine coolant temp), and the TP (throttle position) sensors. The MAP sensor can (I don't know if it does on the Fury or not) monitor barometric only if the engine is not running. It adjusts for altitude because it is measuring the difference in pressure at the manifold.

"The MAP sensor measures the "absolute pressure" (not manifold vacuum) in the engine's intake manifold. The mass of air entering the engine is directly proportional to its density. Density is directly proportional to the air's absolute pressure, and inversely proportional to the air's absolute temperature."

By design the PGM-FI constantly adjusts the amount of fuel being fed to the engine, most people consider the "auto adjusting" something different and that requires an input from an O2 sensor in the exhaust, the US Furys do not have those sensors. This system only knows what is going in, not what comes out, that is why you need a fuel management system when you start changing intakes and exhaust, they are in the most basic example, a high tech jet kit.
Sweet, so I was kind of right... lol... :eek:
 

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The PGM-FI uses inputs from the IAT (intake air temp) , the MAP (manifold absolute pressure) , the ECT (engine coolant temp), and the TP (throttle position) sensors. The MAP sensor can (I don't know if it does on the Fury or not) monitor barometric only if the engine is not running. It adjusts for altitude because it is measuring the difference in pressure at the manifold.

"The MAP sensor measures the "absolute pressure" (not manifold vacuum) in the engine's intake manifold. The mass of air entering the engine is directly proportional to its density. Density is directly proportional to the air's absolute pressure, and inversely proportional to the air's absolute temperature."

By design the PGM-FI constantly adjusts the amount of fuel being fed to the engine, most people consider the "auto adjusting" something different and that requires an input from an O2 sensor in the exhaust, the US Furys do not have those sensors. This system only knows what is going in, not what comes out, that is why you need a fuel management system when you start changing intakes and exhaust, they are in the most basic example, a high tech jet kit.
Very well stated, presented, and summarized, Clueless. Most informative. My hat is off to you.

Cheers
 

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Discussion Starter · #17 ·
Yep Clueless seems very Cluefull:D
 

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Discussion Starter · #19 ·
Now we gotta figure out how to build DIY type FMU's to start trying to get them for less than 250.
 
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