Cat removed! - MVAgusta.net
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post #1 of 12 (permalink) Old 02-19-2008, 07:22 PM Thread Starter
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Cat removed!

Hi guys.

Just wanted to share my experience with you all from removing the cataliser from a 312, since I picked mine up from the dealer today after the removal.

The bike, prior to the cat removal, was all stock.
It still is, apart from the obvious absent cat.

The pipe was cut on one end of the cataliser (easier to spot where it is, since the tube is larger) and split. This was done on the exhaust tips side, in order to avoid damaging the lambda sensor that is located just before the cat, on the downpipes side.
The tube was marked so it would be easier to be lined up on the re-weld. Failing to do so could lead to the exhaust tips not lining up properly and not fitting in the collector tube.
Inside the collector tube the cataliser honeycomb was removed using a torch.

I was amazed.
1- it was heavy. Far heavier than I imagined.
2- it looked VERY restrictive. It surely slows down exhaust gases a lot!

Since the lambda sensor is located before the cataliser honeycomb, it was not affected by this procedure.

The result?
At stand-still, the exhaust sound is slightly louder, with a more metallic and guttural sound to it.
While moving, sound-wise I did not notice much difference.
I should state that I have not ridden my beloved MV for a long time, maybe two months or even more, so it's hard to compare.

The fuelling did not improve.
It's the same. Ridding around town proves somewhat cumbersome, as before.

Regarding power and performance, I did not notice a considerable difference. I believe it's slightly better, specially roll-ons. The conditions were not met for top end testing (traffic), but roll-ons seemed slightly better. However, take this with a grain of salt, since, as mentioned before, I haven't ridden the bike for a long time.

Now, the temperature.
The main reason for all the hard work.

There is a HUGE difference!!!
While standing still, the bike goes to 100º, 101º, 102ºC (212-216º F) tops and then goes straight down as the fans kick in!
It comes down to an impressive 88-90ºC (190-194ºF), something that NEVER happened before!
It even reminded me of my previous CBR954.

Before, specially during the summer, it would go straight up, the fans couldn't cope with the temperature rise. It would never stop climbing, at least until I shut the bike off, afraid of fans melting/coolant spillage or worse.
I have to wait for the next summer in order to properly evaluate the real gains in lowering running temperatures, but one thing is for sure, the initial impression is that it's much better!
Now the fans are able to to it's job properly and effectively bring the temperature down.

I should also state that today the ambient temperature was around 15ºC (60ºF).

I strongly advise people to remove the cataliser.
It's definitely worth it.


Hope this helps.
Feel free to post questions.

Luis Fraga

Last edited by Fraga; 02-19-2008 at 07:29 PM.
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post #2 of 12 (permalink) Old 02-19-2008, 08:05 PM
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Cut it out with a torch huh? I'll have to try that.

Thanks!

CAG
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post #3 of 12 (permalink) Old 02-19-2008, 08:16 PM
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Awesome good to know! I spoke with Spectrum with regards to my Titanium full exhaust system from Arrow and it seems its gonna take a month for them to hook me up. But my race ecu should be in by this friday. Reading these kinda posts gets me all excited and impatient for all the stuff to come in and get put on the bike! THE WAIT IS KILLER!!! I havent ridden my Senna in 6 months!!!
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post #4 of 12 (permalink) Old 02-19-2008, 11:17 PM
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what was your ambeint temp. during this test period??
(just trying to see if it is a viable option for weather were i plan to go)
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post #5 of 12 (permalink) Old 02-20-2008, 12:17 AM
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Same here.

I just had the full stainless headers, mid pipe, RG3's, and race ECU installed. Overall temps down by at least 10 degrees F. Ambient was in the low 70's. The bike never went over 212 when stopped. When riding the average temp was 185. The temps drop very quickly when moving also.
Before in the same climate my bike would run 195-199 when moving. It hit 232 one time when sitting at a light. Kind of scary.
Removing the mid pipe definately drops the bikes temp.
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post #6 of 12 (permalink) Old 02-20-2008, 03:19 AM
 
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Nice one. I know my bike certainly improved when removing the CAT!
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post #7 of 12 (permalink) Old 02-20-2008, 05:11 AM Thread Starter
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Quote:
Originally Posted by TreeMV View Post
what was your ambeint temp. during this test period??
It's mentioned at the end of my post.
Ambient temperatures were around 15ºC (60ºF).

While moving, I didn't notice much difference. Slightly better, but not by much.
But while standing still, there is a huge difference in the sense that the fans are able to bring the temperature down effectively.
Before, the temperature would just keep on rising.

Last edited by Fraga; 02-20-2008 at 05:14 AM.
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post #8 of 12 (permalink) Old 02-20-2008, 07:48 AM
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I recently removed the cat and installed a titanium mid-pipe, but I did not notice a difference in temp. It did change the way the bike sounds. It also made the bike run rough at low RPM's. I still need to take it in to have it checked out.
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post #9 of 12 (permalink) Old 02-20-2008, 11:36 AM
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Nice work Luis and thanks so much for the report

So you did that cat removal there in S. Miguel or did you end up sending the headers to mainland? If so, to where and how much?

Funny you say that after the cat removal the temps only went to 102 max and came down when the fans kicked in, because that's exaclty what happned to mine (with cat) after the impeller mod. So maybe the impeller along with the cat removal will "cure" the heating thing once and for all

Any pics of how the "midpipe" looks after the cat extraction?

And next time i go there we'll have to go for some instead of just a coffe
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post #10 of 12 (permalink) Old 02-21-2008, 02:16 PM Thread Starter
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Quote:
Originally Posted by MV-999R View Post
Nice work Luis and thanks so much for the report
Thanks!
Just trying to be helpful!


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Originally Posted by MV-999R View Post
So you did that cat removal there in S. Miguel or did you end up sending the headers to mainland? If so, to where and how much?
It was done here, and best of all, it was done for free...

Quote:
Originally Posted by MV-999R View Post
Funny you say that after the cat removal the temps only went to 102 max and came down when the fans kicked in, because that's exaclty what happned to mine (with cat) after the impeller mod. So maybe the impeller along with the cat removal will "cure" the heating thing once and for all
Most probably.
I would like to hear from fellow "Agustistas" who have done or are planning on doing both mods.

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Originally Posted by MV-999R View Post
Any pics of how the "midpipe" looks after the cat extraction?
Unfortunately, no...
Yes, I know, I should have taken some pics...


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And next time i go there we'll have to go for some instead of just a coffe
I'll be waitting.
It's on me!
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