General SBK Discussion Thread

[simba_smiles]

2) Eliminates the cat which will make the underseat sperm killing heat go away

And yeah the new R1 surprised me with the underseat exhausts, and which are heavier this year because of the tighter emission controls in place.

@rossiter...

didnt know about this...that by going in for slip-ons/ Y-pipes, and thereby eliminating the cat (didnt even know that slip on's dont have cats) reduce the heat considerably. could you please elaborate?

....simba

[simba_smiles]

@rossiter...

am all ears

...simba

[rossiter]

@rossiter...

didnt know about this...that by going in for slip-ons/ Y-pipes, and thereby eliminating the cat (didnt even know that slip on's dont have cats) reduce the heat considerably. could you please elaborate?

....simba

Hi Simba, let me rephrase what I said in the other post. The heat will not entirely go away, but it will be reduced.

The manufacturers fit catalytic converters to meet the required emission standards, and is part of the bike's emission control system. What the catalytic converter also does is to act like a giant heat trap. Changing the Y-pipe, and/or the slip on will eliminate the catalytic converter, since the aftermarket exhausts and Y-pipes do not come with a catalytic converter installed.

ALternately, you could just remove the catalytic converter from the stock pipes, and that's a nice 2 hour DIY job

[simba_smiles]

Hi Simba, let me rephrase what I said in the other post. The heat will not entirely go away, but it will be reduced.

The manufacturers fit catalytic converters to meet the required emission standards, and is part of the bike's emission control system. What the catalytic converter also does is to act like a giant heat trap. Changing the Y-pipe, and/or the slip on will eliminate the catalytic converter, since the aftermarket exhausts and Y-pipes do not come with a catalytic converter installed.

ALternately, you could just remove the catalytic converter from the stock pipes, and that's a nice 2 hour DIY job

thanks a lot for the elaboration. but would the bike then pass the "pollution-under-control" test at one of our many petrol pumps?

...simba

[Aparajith]

Just a doubt rossiter. In that case are u not harming the environment? Also how much of a change will the cat-con elimination make(in degrees of temperature) or will it also affect acceleration and other parameters as well, cos AFAIK a cat-con slows down the gas flow. So the engine should have been designed with that back-pressure in mind, right?

[rossiter]

thanks a lot for the elaboration. but would the bike then pass the "pollution-under-control" test at one of our many petrol pumps?

...simba

There's no danger of that NOT happening

@Apar: Excellent point there. Once you remove the cat con, it does alter the gas flow.

The way the exhausts are designed is to minimizes back pressure while maintaining an adequate air velocity. This is so that the scavenging in the exhaust is maximised.

So when the cat is removed, the velocity of the exhaust does drop and reduces a little bit of the low-end to mid torque. It's not even noticeable if you ask me. It will be noticeable if you put slip ons/Y pipes which can handle larger volumes of exhaust gases, and THEN you will have a major drop in torque.

As for the environment, I haven't come across any data which has a before and after comparo between the two, but on the face of it, it will pass our emission laws and be far less polluting than some vehicles on our roads, but it will be more damaging than the stock exhaust obviously.

[Aparajith]

^^Yeah, with 176 bhp at ur disposal am sure you are not gonna notice it at all! Thanks for the reply.

[rossiter]

^^Yeah, with 176 bhp at ur disposal am sure you are not gonna notice it at all! Thanks for the reply.

When you're busy trying to hang on to the bars.. You don't notice any torque loss

[Aparajith]

Another doubt, if you remove the cat-cons from the original stock exhaust or replace it with after-market ones or slip-ons etc, are you not messing around with the warranty clauses of ur bike ?

[rossiter]

Another doubt, if you remove the cat-cons from the original stock exhaust or replace it with after-market ones or slip-ons etc, are you not messing around with the warranty clauses of ur bike ?

Yeah I'd be putting the warranty of the bike at risk. I was clearly told that any performance altering aftermarket part put on the bike will endanger my warranty. So, that's pretty clear

[Aryan]

@Rossiter: Sorry for the total off-topic post here, but I just cannot help but comment on your ever-changing avataars! And that too, some "great" personalities..

[manson]

Just what i was thinking Aryan :P

[Aparajith]

@Rossiter: Sorry for the total off-topic post here, but I just cannot help but comment on your ever-changing avataars! And that too, some "great" personalities..

Yeah, I too was thinking about the same thing. I guess Rossiter picks up the most famous personalities of the previous week for his avtar-change job every Monday!

[rossiter]

Do you go to the track often? Have you been to the chennai track; how long is the straight there? I've heard a 600 or 750 is better suited for that track. I'm planning to take my MT there sometime early next year.

SF

Yeah a 600 is the best weapon around MMSC. I've been going there once a month from the past few months, and am addicted to it

In fact, the R15 is faster than the MT01 around MMSC

There was an MT-01 ridden by one of the Yamaha officials at the last R15 championship, and it's not the best bike to have around the track. But the guy was nailing it impressively..

@Apar and Aryan: Just sending a message out my own way guys

[Streetfighter]

Yeah a 600 is the best weapon around MMSC. I've been going there once a month from the past few months, and am addicted to it

In fact, the R15 is faster than the MT01 around MMSC

There was an MT-01 ridden by one of the Yamaha officials at the last R15 championship, and it's not the best bike to have around the track. But the guy was nailing it impressively..

@Apar and Aryan: Just sending a message out my own way guys

Hell no, that cannot be May be he was a rubbish rider? The MT-01 suspension is very badly set up from the factory, too soft. I hated the initial ride. I have just upped the preload and want to adjust the damping pretty soon. Apparently it makes a huge difference, especially on the track.

It's quite a distance from here. A couple of friends truck their bikes to and fro quite often. I'm gonna join up with them, with my MT or something new in the new year.

Do you know Bharat there in Banglaore? He's quite a track freak too, and a great guy to hang out with.

SF