exhaust mods

There was recently a thread on this in the main forum.

Personally, my exhaust has been gutetd (that is, the rivets drilled out, and the exhaust pulled apart, then the packing removed, and the exhaust put back and rivetted together).

It's obnoxiously loud now. Sounds verry agressive, and if that's what you're after it's a pretty cheap way to achieve it.

 

I have the opposite problem, my fzr 250 is way too loud hte police have been around my place at least 5 times, im the only one who rides it so ive never heard it before but people can hear me where ever i am in town. I wanna know how to hush it up a bit. once i get it goin again

 

With Casso's there is a perforated pipe running through the centre of the muffler, which effectively makes it a straight through. I'm quite sure that if that pipe was cut out, because of the way the sound waves would self cancel out inside the muffler, she would be a lot quieter.

That's usually the way most loud pipes are designed- you could also incorporate more of a dogleg in the centre pipe (inside the muffler) which should cancel a bit of noise. Without the centre pipe she won't flow quite as well as a straight through, but should be a lot quieter and throatier.

If you look at the std pipe design, there's usually 2 (or more) points of reverse gas flow which kill performance but also kill noise.

all in all try gutting it but dont install a straight through pipe

Theoretically

 

boogily: Does your bike have EXUP? When I bought my bike it didnt so I picked one up from a wrecker and installed it myself. The sound difference is really impressive at low revs, I was stoked at how much more sophisticated it made the bike sound when driving gently.

Probably not a massive difference, but it now sounds alot more like a quiet jet engine, rather than the mechanical fart boy racers seem to love...

 

The other thread I started on this issue was to try to answer this question. The common consensus is once the internal baffles are removed, without a straight through pipe, the exhaust note should be deeper and slightly louder. However, people with other models have complained that it is still not loud enough.

Most of the time this offers a slight performance increase. I have been told to expect around 75% of the flow of a straight through pipe.

 

Effectively, your engine is kind of like an air / fuel pump. It sucks in air fuel mixture, burns it, and pumps it out through the exhaust. If either of these (inlet / exhaust) are restricted, then it will increase the work that the engine has to do.

Subsequently, decreasing the amount of restriction in the exhaust will make the engines job easier... Less power will be lost trying to pump exhaust gasses, and more power can make its way to the rear wheel.

Of course, it's more complicated than that: The exhaust also provides back pressure / negative waves that actually suck the exhaust gasses out of the combustion chamber (this is called scavenging). Obviously this makes an engines job a lot easier, and the engine will be tuned to make use of it.

Subsequently, if you rip the guts out of your pipe then the reduction in scavenging may completely offset the benefits derived from increased airflow.

All this means is that if you're going to rip the guts out of your exhaust, you will (more than likely) have to re-tune your engine to compensate for the changes in the back pressure... If you don't, you will probably find that performance is adversely affected.

 

Ive installed a yzf r6 exhaust.
I even routed the exup to the one on the r6 exhaust because the r6 also came with uxup. It looks alot better and you could see the valve moving on the exhaust. It also sounds really sweet.

 

did it cost much

 

that sounds pretty damn sweet!

I'll file that one in the memor banks for my streetfighter project

 

Mine had a REMUS muffler on it - it was loud without being overdone but being with exup it was ok at low revs.. It had a straight thru pipe about 40mm diameter.

There is a boy racer around here with a CBR250 and I can hear it miles away I have not had a good look at it but it sounds like its using a straight pipe inserted right thru the muffler.

 

Hi guys. I have a 89 3LN1. The stock muffler that was on it was way to quiet so what I did is I used a hammer drill I have with a 17mm x 500mm long drill bit on it and drilled it through the front baffling chamber then I used a 6mm drill bit on a normal drill then drilled some holes in the end baffling chamber. If you look inside the chrome tip you'll see a smaller pipe you just drill holes around that to make it sound nice.
Now I got a pipe off a 99 R6, I then drilled the reverts out and took the tip off and cut about 130mm off the end because it’s way to long, then pulled all the guts out except for the fibre glass, cut the inlet pipe to length, hammered in the side so it would fit around the swingarm and now it sounds like a beast. <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s -->

 

i been looking for a pipe lately myself

yoshimura and remus seem the best but you do pay for it (arund $700-$800)

but there other options that look pretty good...
Stain Tune
Tyga
Mega Cycle
Race Tune


i have a 2KR and my muffler is welded straight to the pipe how would i go removing baffles from this?
im worried about fitting a slip on too because if i cut the muffler off and the new pipe isnt what i hoped for then i cant go back.
any ideas?
and is this normal for it to be welded?

 

From memory they are all welded to the pipe.. If you have to cut the muffler off, them make sure that the cut is on a straight section of pipe so that it can be sleeved if you need to refit it.

 

thats my problem it looks tapered all the way to the headers id imagine for a slip on you'd need 30mm-50mm of straight pipe to fit it
i will put pics up on monday hope someone can help

 

Exhaust Mods... mmMMmm.... Well. i was doing a search today and found the hottes FZR1000 ive ever seen.

I am officially in love.



The exhaust... i would like to know how this can be achieved. it looks like he's thrown on a can from a car lol.

I am looking to have the same thing on my Fzr250 if possible <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s -->

Any IDea's?

 

Wow! That thing is butt ugly! He has removed the sport from the bike.
Doing the same muffler design will be hard as he has lengthened the swing arm on that bike so he can get a large chrome thing sticking out. The easiest way to get something close would be to get a really short muffler and leave it on the side, will give some of the effect your after - and probably look better IMO. If you put it sticking out like that bike it will scrape if you crank it over very far.

That thing is effectively a chopper and not a sports bike any more. He even removed one of the front discs, to show off the chrome on the rim.

 

hahahaha, well i guess everyone is entitled to their own opinion. I love it, i think its a cross between both a chopper/sports bike. She still looks sexual polished up like that. Longer swingarms look sexual but im sure abit costly. Im just thinking of idea's as im probably gonna have my FZR till i buy an R6 (which is another 2 years).

Has anyone thrown any mods to their FZR?

 

this little baby was of a zxr i have added extra wadding to quieten it down a little but still sounds like it belongs on thunder road, its a deep throaty rumble, when you change down a gear it pops off like a machine gun and it annoys the hell out of the neighbours as you can hear it coming a mile away lol had to have re tuned and balanced but it was well worth it wish i had the extra cash to spend on this pocket rocket but my gixxer build is priority