Exhaust

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Exhaust; cat
Topic Started: Fri Aug 24, 2007 6:28 pm (470 Views)
red baron	Fri Aug 24, 2007 6:28 pm Post #1
Newbie Posts: 39 Group: Members Member #572 Joined: October 8, 2006	Hi can anyone help , i have a 1990 190e 2.0 5 speed with a cat . I've heard you can remove the cat.What i need to know is what to replace it with? and what about the lamba sensor and the possible ecu issues.



CrysAk	Fri Aug 24, 2007 8:04 pm Post #2
Moar Bass! Posts: 5,048 Group: Members Member #456 Joined: August 14, 2006	i need info on this also ^^ anyhelp would be great (yes ill have a legal engine in for it :P)



JensonGB	Fri Aug 24, 2007 8:20 pm Post #3
I Will Find One That I Keep! Posts: 3,302 Group: Members Member #619 Joined: October 25, 2006	I remember reading somewhere that if the O2 sensor is before the cat you shouldn't have any problems removing the cat. Thinking about it, the sensor is taking it's reading before the cat anyway, so why would it make a difference if the cat was there or not, unless the additional back pressure a cat makes enters the equation somewhere. If the senor is after the cat, then i can see issues arising, of course i could be completely wrong about it all, but it just seems logical to me



JensonGB	Fri Aug 24, 2007 8:38 pm Post #4
I Will Find One That I Keep! Posts: 3,302 Group: Members Member #619 Joined: October 25, 2006	Just a thought! as well as gaining anywhere between 2-10 hp (depends on which forum you read!) at the high RPM range , you may lose some low down torque which is a consequence of reducing the back pressure by removing the cat



Matt	Fri Aug 24, 2007 9:33 pm Post #5
Administrator - Hawk Eye Posts: 14,126 Group: Admin Member #20 Joined: November 8, 2005	CrysAk Aug 24 2007, 10:04 PM i need info on this also ^^ anyhelp would be great (yes ill have a legal engine in for it :P) Firstly, in response to CrysAk's question, if you are putting an engine in which didn't have a cat fitted to it, dont bother fitting one on As for the cat removal, yes you can remove it and fit a straight thru pipe to both sections, but keep the Lambda plumbed in. The Lambda is after the cats by the way.



roadwolf69	Fri Aug 24, 2007 9:43 pm Post #6
Member Posts: 986 Group: Members Member #975 Joined: February 22, 2007	Don't confuse back pressure from baffle plates in the silencer with restriction from the cat, if you cut a catalytic converter open you would wonder how the exhaust gas gets out at all, its much like having your silencer filled with plaster of paris.



CrysAk	Fri Aug 24, 2007 11:17 pm Post #7
Moar Bass! Posts: 5,048 Group: Members Member #456 Joined: August 14, 2006	no matt , my cars got a cat fitted at the moment but im fitting a 91 engine that doesnt need a cat (i think...) so will need to remove the current cat



JensonGB	Sat Aug 25, 2007 7:45 pm Post #8
I Will Find One That I Keep! Posts: 3,302 Group: Members Member #619 Joined: October 25, 2006	Matt Aug 24 2007, 11:33 PM The Lambda is after the cats by the way. Mines before the cat, towards the bottom of the down pipes..........is that not right? or does it sound like it's been modded some how?



malco	Sun Aug 26, 2007 11:06 am Post #9
Member Posts: 384 Group: Members Member #1,236 Joined: May 5, 2007	Take a look at THIS thread. Has got a full diagram of the various systems. Looks like the sensor is before the cat.



Matt	Sun Aug 26, 2007 5:41 pm Post #10
Administrator - Hawk Eye Posts: 14,126 Group: Admin Member #20 Joined: November 8, 2005	malco Aug 26 2007, 01:06 PM Take a look at THIS thread. Has got a full diagram of the various systems. Looks like the sensor is before the cat. No, look at the diagram of the top system. Thats the only one fitted with the 2x CATs and the sensor is after the cats and just infront of the middle box. Just fitted one today and thats exactly how it is.



Matt	Sun Aug 26, 2007 5:43 pm Post #11
Administrator - Hawk Eye Posts: 14,126 Group: Admin Member #20 Joined: November 8, 2005	CrysAk Aug 25 2007, 01:17 AM no matt , my cars got a cat fitted at the moment but im fitting a 91 engine that doesnt need a cat (i think...) so will need to remove the current cat Thats what I meant mate, don't fit one



Sev	Mon Sep 3, 2007 8:11 am Post #12
No Longer a Registered Member Posts: 1,981 Group: Members Member #962 Joined: February 19, 2007	wow, never heard of a o2 sensor after the catalytic. you would think they did that so you don't remove the cat. no laws against cat removal in the UK? all NAm exhausts have the o2 right where the downpipes converge. everything after that is fair game (until smog time, at least)



Ukmerctechie	Mon Jun 22, 2009 9:13 pm Post #13
Member Posts: 2,163 Group: Members Member #454 Joined: August 12, 2006	Matt Sun Aug 26, 2007 5:41 pm malco,Aug 26 2007 01:06 PM Take a look at THIS thread. Has got a full diagram of the various systems. Looks like the sensor is before the cat. No, look at the diagram of the top system. Thats the only one fitted with the 2x CATs and the sensor is after the cats and just infront of the middle box. Just fitted one today and thats exactly how it is. The Cat in the top picture is the bigger box AFTER the O2 sensor,the smaller boxes at the top of the pipe are not Cats. The O2 sensor is needed before the cat so as not to allow rich mixture to hit the cat and burn it out,as well as regulating the co level.Newer management systems have twin sensors before and after the cat to evaluate the efficency of the cat.



MICHAEL	Mon Jun 22, 2009 9:57 pm Post #14
Member Posts: 5,622 Group: Members Member #555 Joined: September 28, 2006	My 2.5-16 doesn't have a cat, but does that mean it will have a Co2 sensor anway?



Ukmerctechie	Mon Jun 22, 2009 10:08 pm Post #15
Member Posts: 2,163 Group: Members Member #454 Joined: August 12, 2006	No mate no cat no sensor but it will have all the associated wiring fitted.



balamb37	Wed Jun 24, 2009 8:54 am Post #16
Member Posts: 560 Group: Members Member #3,881 Joined: February 25, 2009	Hi, If you remove the 'Cat' you have to leave the 'Lamda Sensor' in and connected otherwise your ECU won't know how to regulate the mixture and will go into 'Emergency Mode' and that isn't good for the motor or 'consumption'. And legally I think the year is pre-1991 after that you can get 'Done' for removing it. And the 'Lamda Sensor' IS ALWAYS BEFORE the 'Cat' those that look like 'cats' two off, are in fact only 'Expansion Boxes'



protearose	Fri Jul 17, 2009 6:59 pm Post #17
Member Posts: 75 Group: Members Member #2,058 Joined: December 22, 2007	Hi. Have anyone actually removed their cat and replaced it with a straight through pipe and if so what was the result regarding performance etc.



Phil_Irl	Sat Jul 18, 2009 1:16 am Post #18
3 Mercs and counting...... Posts: 123 Group: Members Member #4,140 Joined: May 11, 2009	protearose Fri Jul 17, 2009 6:59 pm Hi. Have anyone actually removed their cat and replaced it with a straight through pipe and if so what was the result regarding performance etc. I removed the CAT on my 92 190E auto..... she baffles now in the bottom of the down pipes and sounds a whole lot nicer and is quicker off the line then she was but in respect she does use a little more juice but worth it in my view.... Phil



Andre F	Sat Jul 18, 2009 8:26 am Post #19
Member Posts: 230 Group: Members Member #2,074 Joined: December 29, 2007	I removed the cat on my 2,6... No significant power change, just more noise :-o But it had to go, it kept scraping speed bumps and what not...



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