Do i need an exhaust?

[SickofRats]

What will happen to the combustion process if I remove my can altogether? I've heard anything from backpressure issues, to nothing at all.

Can anyone enlighten me, us?

That said, if i do have a freer flow, would a proper pcIII mapping resolve any possible issues?

thanks for your time

 

[auntiebling]

nothing you can detect without a dyno and wide spectrum o2 sensor.

it will be ridiculously loud and everyone around will hate you

 

[Junkie]

just pull the whole header off, saves more weight. stock 954 headers are heavy.

 

[SickofRats]

Thanks guys i knew barf was good for something! You can remove the formerly from your title unkieJay.

Seriously though i modded the stock can can so she can breath a bit, hope i didn't do anything that will fudge up the works; sounds alot better too!

Anyone in the know ? preferably without sarcasm.

 

[AOW]

if by "modding" the stock can you removed part of or the entire baffle, you will only create more noise. Sure the exhaust may exit quicker, but if you don't do anything for your intake it's a moot point.

 

[mototireguy]

Aside from the extra loud exhaust noise bait for the police it's doubtful that messing with the exhaust will damage the motor.

As far as improving or degrading performance you can't really know if you fudged up the package without including a run on a dyno with the exhaust sniffer and checking the hp/torque/air-fuel results.

Adding a Power Commander gives you some air/fuel control but there's more to this tuning game that you might think.

Free flowing open exhausts are not the only factor in improving overall performance. True performance gains are a balancing act of factors (airbox, cams, air/fuel, exhaust header sizes, back pressure, etc) and you're only fiddling with one factor you're unbalancing the overall equation.

 

[Burning1]

If you remove the exhaust, you will be punched* in the face until it is reinstalled.




* Note, this is not an actual threat of violence. All punching will be of the figurative kind, despite the fact that punching someone in the face for acting like a self centred jackass would make me very happy.

 

[SickofRats]

I wasnt implying I was going to take it off *, I want to know what are the pros/cons . I removed the baffle because the bike couldn't breath ( now this is a figure of speech , we all know bikes don't respirate like animals, right? ) due to jetting and previous owner putting stock can back on. There was laggy throttle response prior to baffle adjustment, now she's down right spritely ( again, the bike is not a she, its my way of projecting my affection upon an inamimate object).

thanks for the constructive responses, seems like there's alot to consider here.

*f you

 

[Ironbutt]

I have a cutting torch.. lemmie have at it.. I'll cut that bitch right off; zippity quick..

 

[auntiebling]

What will happen to the combustion process if I remove my can altogether? I've heard anything from backpressure issues, to nothing at all.

Can anyone enlighten me, us?

That said, if i do have a freer flow, would a proper pcIII mapping resolve any possible issues?

thanks for your time

I wasnt implying I was going to take it off *, I want to know what are the pros/cons . I removed the baffle because the bike couldn't breath ( now this is a figure of speech , we all know bikes don't respirate like animals, right? ) due to jetting and previous owner putting stock can back on. There was laggy throttle response prior to baffle adjustment, now she's down right spritely ( again, the bike is not a she, its my way of projecting my affection upon an inamimate object).

thanks for the constructive responses, seems like there's alot to consider here.

*f you

you're right, you didn't imply it you flat out said it

 

[Burning1]

The serious answer to your question... When you're passionate about motorcycles, there is a very strong temptation to fiddle, always looking to make the bike perform better.

While a lot of the stuff people do to their bikes may make them feel better, it carries in the long run very negative consequences for their machines, themselves, and the riding community as a whole. No-where is this more prevalent than with exhaust modifications. Remember: "Loud pipes cost rights."

And seriously... I raced a full season with the stock exhaust, and did well enough to fill a shelf with trophies. If you want your bike to perform better, leave it alone and focus on riding skill.

 

[Junkie]

I wasnt implying I was going to take it off *, I want to know what are the pros/cons . I removed the baffle because the bike couldn't breath ( now this is a figure of speech , we all know bikes don't respirate like animals, right? ) due to jetting and previous owner putting stock can back on. There was laggy throttle response prior to baffle adjustment, now she's down right spritely ( again, the bike is not a she, its my way of projecting my affection upon an inamimate object).

thanks for the constructive responses, seems like there's alot to consider here.

*f you

What carburetors did the previous owner install? Not sure that I've heard of that being done on a 954 before.

 

[SickofRats]

Ah dunno, Im assuming the throttle bodies were jetted - this is a an ex trackbike. Im ignorant on jetting with regards to fuel injection. Im assuming this, because the stock can was put on after sale, and low - mid was an unresponsive mess, until taking the can off - test ride, then modding the can.

It boils down to either a defective can, or a jetted carb vs stock can cluster -f ? I want to get a slipon so I get some backpressure again but the whole point of the thread was to find out if its actually needed, or am I just fine the way things are?

I'm not trying to create strife, just find answers. Appreciate the help.

 

[Flying Pig]

If you remove the exhaust, you will be punched* in the face until it is reinstalled.




* Note, this is not an actual threat of violence. All punching will be of the figurative kind, despite the fact that punching someone in the face for acting like a self centred jackass would make me very happy.

I see what you did there :nerd

 

[Burning1]

If the bike is 2000 or newer, it's EFI. EFI systems aren't re-jetted like carbs - typically a piggyback ECU is installed, such as a power commander, that enriches the fuelling a little. If the previous owner just had a slip-on exhaust installed, there's a good chance that they didn't do anything to the fuel map.

If I were you, I'd check to make sure that all the basic maintenance is done before digging into fuelling and exhaust.

 

[Caddywumpus]

I have a cutting torch.. lemmie have at it.. I'll cut that bitch right off; zippity quick..

OAKLAMBD

 

[kiltwearinfool]

If the previous owner changed anything with the fuel/air mixture, you want to address that before messing with the exhaust. If the bike is injected, and it still has the Power Commander / EFI unit attached, work with someone to restore the stock map. By gutting the can, you may have made the bike run a little better, but you're not really addressing the root cause of the poor throttle response. Other things may be causing it.

Removing the exhaust entirely will do three things:
1) It will immediately annoy anyone within 1/4 mile of your bike. No kidding. It's that freakin loud. If you ride to work, your neighbors will hate when you start the bike up in the morning. They may even complain to your landlord.

2) Over time, you will damage the valves if the bike is running too lean.

3) Over time, you'll begin to hear ringing in your right ear, even when you haven't been riding - with or without ear plugs. Believe me, it will suck not being able to listen to music with the same sensitivity to sound that you once had.

If you were constipated, would you rip out your large intestine? Hopefully not. You'd probably fix whatever fiber imbalance caused you to get backed up in the first place. Similarly, if your bike is running poorly, the exhaust is the last of many causes. Figure out what's imbalanced and correct it - if you want to keep your bike running well for a while.

 

[mototireguy]

Ah dunno, Im assuming the throttle bodies were jetted - this is a an ex trackbike.

Ex-trackbike, unknown mods, assuming re-jetted, etc?

Does the bike have a Power Commander, TuneBoy or other aftermarket EFI brain unit installed?

More details like these needed.

Wild guess here is the prior owner had the bike tuned for some race exhaust system and then re-installed a stock exhaust when he sold the bike.

Better detailed info could yield better guesses.

 

[SickofRats]

good deal, that's alot better than punching... I cant remember the exact words, but it goes something like this:

Arguing on barf is like the special olympics:
no matter who wins, you're both ruh tarted

Ill check into regular maintenance, but I had a major tune up at the ol werkstat as soon as I got the bike. Thanks for the help everyone, and I liked the trackday footage Flying Pig.

 

[SickofRats]

No commander or efi unit installed. 2002 so it cant be jetted, means a faulty stock can was probably restricting flow - logical guess.

You guys can save the noise comments I don't know how many times I have to say Ive got the can on. The question was what will happen to a bikes performance without a can? I don't want to fuck up the bike, I want it running properly, so I need to get a replacement can, that seems like the logical step.

Kilt, Ive gone 3 times today already. Its amazing what taking out one O-ring can do!