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Old 10-13-2012, 03:37 AM   #1
gotojoe
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Default kicking out the cat

I have a catless link pipe in a box. Intended use F4 1000R 2007

I'm wondering what would happen if I took off the cat link pipe and fitted it keeping with the stock ecu.

What changes does the ECU sense when the cat goes missing and why is it customary to fit a microtec thingy at that stage...?

Would the bike start running like a bag of bent nails..if so I don't understand why as the ecu modifies fuel injected to manifold pressure ??

learning curve steepening

joe
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Old 10-13-2012, 07:19 PM   #2
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Joe;
there is no manifold pressure sensor, ECU doesn't know anything about it, but it must see an 02 sensor signal
with the MicroTec ECU the 02 sensor can be removed
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Old 10-14-2012, 03:05 AM   #3
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Thanks Noel..

I'm pretty well at a zero knowledge level on the workings of the ECU..but I used to be able to program my Commodore 64 back in the day : )

You're spot on that there is no manifold pressure sensor..I was thinking more of throttle position sensor which by default gives the ecu a manifold pressure reading ? kindof ? I was working on a Moto Guzzi yesterday and thought as I worked ..there really is no MPS on my F4 lol

( paragraph deleted )

I have more questions than answers here Noel but what changes..Why do peeps go and fit a Microtec , which I know is $$$ there must be some parameter the oe ecu can't process when the cat is out..

thanks for your advices : ))

joe

Last edited by gotojoe : 10-15-2012 at 05:42 AM.
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Old 10-15-2012, 05:41 AM   #4
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I'm just looking at the 02 sensor on the stock link pipe. It is fitted up stream of the catalytic converter core. That means it is sampling exhaust gases before they pass into the catalytic converter itself.

To my simple mind that suggests that the ecu would not know anything at all if the cat wasn't there so long as I leave the 02 sensor in the same position in the pipe.

I still can't understand why I would need a Microtec if I take the cat out . The stock ecu wouldn't know the cat has gone ..I'm back to the only change is back pressure//perhaps ??

joe

Last edited by gotojoe : 10-15-2012 at 05:45 AM.
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Old 10-15-2012, 11:29 AM   #5
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Joe,
I don't know you remember my posted, I took out the cat from oem midpipe and using oem ecu also using race ecu still poping and back fire, as far as I know either you can add PC3usb to get dyno tunning or microtec to get all that poping and back fire to go away.
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Old 10-15-2012, 12:28 PM   #6
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Quote:
Originally Posted by PhilAgusta View Post
Joe,
I don't know you remember my posted, I took out the cat from oem midpipe and using oem ecu also using race ecu still poping and back fire, as far as I know either you can add PC3usb to get dyno tunning or microtec to get all that poping and back fire to go away.
Thank you Phil.. appreciate the benefit of your experience.

The question Im particularly asking is, considering that the Lamda sensor is upstream of the Cat core...if I leave it in place in a catless link pipe there should be no difference in the 02 ...So why would I need a Microtec.
?


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Old 10-15-2012, 01:53 PM   #7
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I had an o2 sensor bung welded into my mid-pipe and ran the stock ECU with no cat and Arrow cans with no problems. With the dB killers installed. dB killers out made the fueling a touch lean on decel and I got some afterfire but otherwise it ran fine. I now have the MV Corse cans and "Kit" ECU and 02 sensor dead. Bike runs fantastic and guess what? I still get some afterfire on decel but I like it.

So this is what you do....get a bung welded into your mid-pipe and put it on. leave everything else stock and you will be fine.

People install the Microtech because you can tune the engine for much better performance in all regards. Do you have to have it? No, but if you can afford it then it is a terrific upgrade.
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Old 10-15-2012, 02:10 PM   #8
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Quote:
Originally Posted by esq'z me View Post
I had an o2 sensor bung welded into my mid-pipe and ran the stock ECU with no cat and Arrow cans with no problems. With the dB killers installed. dB killers out made the fueling a touch lean on decel and I got some afterfire but otherwise it ran fine. I now have the MV Corse cans and "Kit" ECU and 02 sensor dead. Bike runs fantastic and guess what? I still get some afterfire on decel but I like it.

So this is what you do....get a bung welded into your mid-pipe and put it on. leave everything else stock and you will be fine.

People install the Microtech because you can tune the engine for much better performance in all regards. Do you have to have it? No, but if you can afford it then it is a terrific upgrade.
Thank you Ed. That is the definitive answer : ))..

So then the next consideration is. without going the full hog and installing a Microtec, what other advantages are there in kicking out the cat ?

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Old 10-15-2012, 02:19 PM   #9
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Lower running temperature


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Old 10-19-2012, 02:44 AM   #10
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Lower running temperature true but what effect on fuel mixture after reducing exhaust back pressure ..It will weaken ?
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