I cant help you, but have you tried searhing? I've seen this topic covered quite a few times:yesnod

 

Already posted something like this in the Help section, but thought I'd get an opinion over here too.

I'm thinkin' of gutting the Cat out from my pipe. But I'm NOT planning on getting a PC3 or any aftermarket air filter. I'm not doing this for any supposed HP/torque gain, nor am I expecting the seat to be any much cooler.

What I hope is that the bike's temp reading (and the fan) won't light up in start/stop traffic.... I ride in town a lot.

My question is this....

Will removing the cat

- Make the bike run dangerously lean? leading to potential damage?
- Affect low rpm operation (jerky, erratic or otherwise)
- Lose low rpm power... and affect its streetability?

Hope some of you can shed a lil light on this.

Thanks for the heads up

I removed my cat myself. Opening up the exhaust will cause the already lean running engine to become even leaner, IMO. Therefore, without adding a Power Commander or something equivelant to enable you to download a richer running tune I'd stay away from doing that.
As far as running hot I wouldn't even expect a major difference there. My fans still come on at like 222-223 & cool the engine to around 213 in stop & go traffic. Your engine would probably cruise the interstate a little cooler though(maybe). Just my thoughts, Fred

 

I cant help you, but have you tried searhing? I've seen this topic covered quite a few times:yesnod

Yeah, I did some searching and found threads about it. But they usually end up in flames and bickering over differences in opinions... or worse... off topic banter.

So I hope that someone would just give me a straight answer.





Thanks Fred. So from what I gather... the already lean-running engine would run even leaner, and temperatures in traffic would make no difference with or without the cat.

I guess that would logically mean leaving the Cat as it is... for now.


Anybody else has tried it, or have an opinion on it?

 

If you search a little bit there should be at least 1 or 2 threads possibly even a how to.... :thumbup

 

here are some cats guts

 

i removed mine. seat temp during hot summer days was significantly reduced.power difference none that i see. havent been back to dyno since i removed it. i dont think it will lean your engine out to the point of burning it up. i have seen no change in fuel mileage vs with cat in. Now it takes about little over 1-2 hours just to get to it. u have to remove all kids of stuff. if you live in hot climate and are worried about hear issues, then remove it. i dont think that u need a powercommander just by removing CAT, would it help in HP.....maybe

 

here are some cats guts

you bastard!!! i was just putting food in my mouth!!! ya got me:finger

 

1longR1 - thanks for the politely answered responce. I know this is off topic but what is it with the "search" police on all these forums. I have been debating the same thing and have followed some of these threads about this same topic but like Kenny said so many times threads get lost with the flaming and BS its hard to sift through all the bullshit so when needing a quick answer to a question that I'm sure someone has can be quite taxing. For the a**holes that have nothing better to do then watch there post count go up by just replying SEARCH!! just keep your opinions to yourself. There are so many times I will read what is a new thread to me because I have a life and don't live on all these forums that I am fortunate to read because someone asks a question that I may or may NOT be wondering myself and has possibly been already discussed before but I never would have known unless someone else was wondering the same thing or wondering something that never even came to mind at the time and now I have benefitted from that. Now that I'm done ranting for the night thanks and I will be gutting my cat now...just like our mothers told us when we were little "if you don't have anything nice to say then don't say anything at all!"


Joe

i removed mine. seat temp during hot summer days was significantly reduced.power difference none that i see. havent been back to dyno since i removed it. i dont think it will lean your engine out to the point of burning it up. i have seen no change in fuel mileage vs with cat in. Now it takes about little over 1-2 hours just to get to it. u have to remove all kids of stuff. if you live in hot climate and are worried about hear issues, then remove it. i dont think that u need a powercommander just by removing CAT, would it help in HP.....maybe

 

i removed mine. seat temp during hot summer days was significantly reduced.power difference none that i see. havent been back to dyno since i removed it. i dont think it will lean your engine out to the point of burning it up. i have seen no change in fuel mileage vs with cat in. Now it takes about little over 1-2 hours just to get to it. u have to remove all kids of stuff. if you live in hot climate and are worried about hear issues, then remove it. i dont think that u need a powercommander just by removing CAT, would it help in HP.....maybe

Thanks 1longR1.

So, without a PC3, will I notice any loss in low rpm power or response?

I do a lot of street riding, & most of the time my rpms will be in the 3 to 6K region. I know that top end will improve though, but low end and mid range are more of my concern for now. I hope that the ride doesn't get jerky or erratic.

 

I hope this will actually help.I removed mine with no other mods whatsoever and I am very happy with the results.I have no negitive results from the bike at all.I do notice that I dont have a hot seat issue and with the size of my ass thats surprizing!I have dynoed my bike on pump gas and have the dyno sheet right here showing my max power at 153.89hp.I would recommend it and I would do it again in a heartbeat.As a service manager I have at least a little knowledge although I dont post too much becouse everybody knows everything on the internet.Hope this helps

 

here are some cats guts

Looks like a flesh wound, give a couple of days and some band-aids and it will be as good as new.



Do some research for CAT removal, as I'm getting the GYT-R Carbon pipes and the cat stays. To be honest, I have no problem with the cat being there. Some get the mentality, that it being an anti-pollution device, that it is going to have a major effect on performance. This cat is physically larger, as you can see, than the rest of the primary piping, which makes you think that the Engineers @ Yamaha have allowed for unrestricted flow from the smaller diameter primary.

Warp out :vanish

 

Thanks 1longR1.

So, without a PC3, will I notice any loss in low rpm power or response?

I do a lot of street riding, & most of the time my rpms will be in the 3 to 6K region. I know that top end will improve though, but low end and mid range are more of my concern for now. I hope that the ride doesn't get jerky or erratic.

i had no loss of power. it works great around town. i really thought it would sound different or act different, but i cant see any real changes except for little heat gone. oh and i forgot i did dyno after it was removed. my first dyno was nice cool day, 28%humidty,29 /BP 42 miles on her went 148.97 on dynojet 250i with latest software.

different day cat removed, hot as hell, at harley shop with old dynojet 100 with old asss software and no tq readings went 145. and 217 on juice.

 

No problems here, when I did it. Not too hard to remove the parts to do it. It was a pain banging on the honey comb of the cat itself. The exhaust note is better and the bike does run cooler. The seat itself doesn't get as hot. Power seems the same. Overall, I was pleased.

 

No problems here, when I did it. Not too hard to remove the parts to do it. It was a pain banging on the honey comb of the cat itself. The exhaust note is better and the bike does run cooler. The seat itself doesn't get as hot. Power seems the same. Overall, I was pleased.

It does sound & flow better for sure. The honeycomb just took a little time, the hardest part for me was putting the damn push pins back in right on the under side of the tail part,lol-Fred

 

Yea, new bikes are getting tighter & tighter. I guess we can blame mass centralization! Adjusting the rear shock (ohlins) is a pain too its so close.

 

I have Akrapovic slip ons with tye Y pipe that eliminates the cat. When I got the stock piece out I was surprized how well air flows through the cat. It has a honeycomb shape but there is nothing blocking air flow. Each little hole in the honeycomb goes straight through. I thought it was going to be blocked up where the engine had to force the air through it but that was not the case. The only thing I could see causing the air flow to be restricted was the heat. Maybe air doesn't flow well through a piece of pipe that hot, but I don't know I haven't really researched it. If I had stayed with the stock system then I would have left it in.

 

yea after mine ran for a few minutes the CAT was still hot after 1hour of wait time. it retains heat for sure.

 

here are some cats guts

:ugh

Looks like some General Tsao's Chicken I had the other night.




:cowboy

 

I have Akrapovic slip ons with tye Y pipe that eliminates the cat. When I got the stock piece out I was surprized how well air flows through the cat. It has a honeycomb shape but there is nothing blocking air flow. Each little hole in the honeycomb goes straight through. I thought it was going to be blocked up where the engine had to force the air through it but that was not the case. The only thing I could see causing the air flow to be restricted was the heat. Maybe air doesn't flow well through a piece of pipe that hot, but I don't know I haven't really researched it. If I had stayed with the stock system then I would have left it in.

Uh-huh I hear ya.

So do you have a PC3 to go along with your Akras?