CL55 AMG Kompressor - Primary De-CAT
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From: Guildford, Surrey, UK
CL55-AMG
CL55 AMG Kompressor - Primary De-CAT
I really need some help guys. I was advised to do a Primary CAT delete and fit 200 cell sports secondaries to increase performance, but I cannot get rid of the EML alarm even tho we moved the Lamdas passed the secondaries. Has the extra length of wire upset the system that much? I'm massively down on power and now running very rich, so the sensors are definitely screwed. And yet it passed the UK emissions test with flying colours, I don't get it. Please help as I cannot find a genuine answer here in the UK 
I'm thinking of putting everything back as it was
I'm thinking of putting everything back as it was
Last edited by RichN2O; Aug 15, 2012 at 12:31 PM.
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S500 LWB ( W221 ) - CL63 Biturbo ( W216 ) CL 55 Kompressor ( W215 Sold ) C43 AMG ( W202 Sold )
Speak to Olly at PCS Tel 02392 Mobile 07922 023450 he is at Waterlooville just down the A3 highly recommended MBClub UK Forum or Tony at TM Motors West Molesey 0208 941 4044 not a million miles away.
Both very knowledgeable
Both very knowledgeable
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I'm seriously considering just moving the new CATS back to where the primaries were and put the lamdas back in their original mounts. The reason I did this was I was running 13.0 @ 106 on the 1/4 mile and I ONLY want a 12 sec car
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you have pre and post primary cat o2 sensors (lambda for you brits
the precat o2 sensors are used for fuel mapping
the rear o2 sensors are used for cat efficiency measurements and less for fuel optimization (in das you can see how much life is left in cats because of the readings of the rear o2 sensors).
if you are having problems with the rear o2 sensors because you removed the cats - a pair of o2 sims (o2 sensors that always read perfect 14:1 efr) might be your solution.
unless i missed something
the precat o2 sensors are used for fuel mapping
the rear o2 sensors are used for cat efficiency measurements and less for fuel optimization (in das you can see how much life is left in cats because of the readings of the rear o2 sensors).
if you are having problems with the rear o2 sensors because you removed the cats - a pair of o2 sims (o2 sensors that always read perfect 14:1 efr) might be your solution.
unless i missed something
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Joined: Feb 2012
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From: Guildford, Surrey, UK
CL55-AMG
you have pre and post primary cat o2 sensors (lambda for you brits
the precat o2 sensors are used for fuel mapping
the rear o2 sensors are used for cat efficiency measurements and less for fuel optimization (in das you can see how much life is left in cats because of the readings of the rear o2 sensors).
if you are having problems with the rear o2 sensors because you removed the cats - a pair of o2 sims (o2 sensors that always read perfect 14:1 efr) might be your solution.
unless i missed something
the precat o2 sensors are used for fuel mapping
the rear o2 sensors are used for cat efficiency measurements and less for fuel optimization (in das you can see how much life is left in cats because of the readings of the rear o2 sensors).
if you are having problems with the rear o2 sensors because you removed the cats - a pair of o2 sims (o2 sensors that always read perfect 14:1 efr) might be your solution.
unless i missed something
Just had a call back from Kleemann and they are going to help with the sensor issue :-)
Last edited by RichN2O; Aug 16, 2012 at 11:05 AM.
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Apparently I need an ECU upgrade which involves turning off the secondary O2 sensors.
I hope this works as I'm starting to regret the path I have taken. The primary de-cat was recommended by local tuners, but Kleemann say it was a waste of time and now I have to spend more time and money to get it back to how it was
I hope this works as I'm starting to regret the path I have taken. The primary de-cat was recommended by local tuners, but Kleemann say it was a waste of time
and now I have to spend more time and money to get it back to how it was
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Apparently I need an ECU upgrade which involves turning off the secondary O2 sensors.
I hope this works as I'm starting to regret the path I have taken. The primary de-cat was recommended by local tuners, but Kleemann say it was a waste of time and now I have to spend more time and money to get it back to how it was
I hope this works as I'm starting to regret the path I have taken. The primary de-cat was recommended by local tuners, but Kleemann say it was a waste of time
and now I have to spend more time and money to get it back to how it was
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From: Guildford, Surrey, UK
CL55-AMG
If I can't find the suggested simulators, have you heard of this fix.
What do you think, has anyone used this?
O2 Sensor Spacer for car installed with a Hi-flow cat, header or test pipe?
You'll most likely get a check engine light code P0420 or P0430 due to added exhaust flow which puts your car into limp mode; your car will be running slower and wastes more gas!!
Our O2 sensor spacer is a perfect solution for you!! It will gap out your down stream o2 sensor away from the added exhaust flow / heat. Allow your o2 sensor and ECU to get a correct reading
What do you think, has anyone used this?
O2 Sensor Spacer for car installed with a Hi-flow cat, header or test pipe?
You'll most likely get a check engine light code P0420 or P0430 due to added exhaust flow which puts your car into limp mode; your car will be running slower and wastes more gas!!
Our O2 sensor spacer is a perfect solution for you!! It will gap out your down stream o2 sensor away from the added exhaust flow / heat. Allow your o2 sensor and ECU to get a correct reading
Last edited by RichN2O; Aug 19, 2012 at 06:49 AM.
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CL55-AMG
I know I'm being **** about this, but I MUST get it right for the sake of the engine. If I can get an O2 Simulator, will this make my engine run at its best. I've NEVER encountered Primary and Secondary CATS & Sensors before, so I'm struggling to get this right.
Please confirm my understanding, does the Primary Sensor control the AFR's?
Please confirm my understanding, does the Primary Sensor control the AFR's?
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From my understanding Kleeman is the only company that can ignore the rear 02 sensors and have your car still pass emissions. My car threw cat codes so I sent the ECU to them and now they are ignored and have no check engine light. The car also runs great. The pre-cat 02s send signal to the ecu to control the mixture. It cost 200 bucks plus shipping.
Last edited by layzie12g; Aug 19, 2012 at 05:32 PM.
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From: Guildford, Surrey, UK
CL55-AMG
From my understanding Kleeman is the only company that can ignore the rear 02 sensors and have your car still pass emissions. My car threw cat codes so I sent the ECU to them and now they are ignored and have no check engine light. The car also runs great. The pre-cat 02s send signal to the ecu to control the mixture. It cost 200 bucks plus shipping.
My car already passes emissions (with flying colours), and yet the dyno says its down on power and running very rich, so I'm confused as hell
Last edited by RichN2O; Aug 19, 2012 at 05:48 PM.
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Found this, very interesting and matches my symptons:
Do you have a 1996 to Present vehicle with CEL, ECU or MIL Light on...
and have a test pipe, high flow cat, downpipe, or high performance exhaust installed?
Then This O2 Simulator is perfect for you and will get rid of those Annoying P0420 and P0430 Codes!
This O2 Simulator works by moving the troublesome O2 sensor out of the Direct Exhaust Flow.
99.9% of the time this tends to be the Post (rear) O2 Sensor in modified exhaust systems (at or after the cat).
This sensor is also known as the 'Heated Sensor Circuit' or 'Bank 1 sensor 2'.
With a modified exhaust system, this sensor receives A Higher Exhaust Temperature and A Higher Exhaust Flow Rate than Stock Exhaust Systems. This causes the ECU to read that the exhaust system is out of balance. When the ECU sees that the system is out of balance it throw's a code and drops into 'limp mode' (safe mode). When you add this O2 Simulator onto the Post Cat O2 Sensor, it will remove the troublesome O2 sensor from direct exhaust flow and sends the ECU the expected exhaust reading. Thus allowing your ECU to run the motor optimally.
This O2 Simulator simply is screwed on to your existing O2 sensor and the assembly is replaced into the O2 bung.
In this case the simulator is an extension tube and is starting to make sense
Do you have a 1996 to Present vehicle with CEL, ECU or MIL Light on...
and have a test pipe, high flow cat, downpipe, or high performance exhaust installed?
Then This O2 Simulator is perfect for you and will get rid of those Annoying P0420 and P0430 Codes!
This O2 Simulator works by moving the troublesome O2 sensor out of the Direct Exhaust Flow.
99.9% of the time this tends to be the Post (rear) O2 Sensor in modified exhaust systems (at or after the cat).
This sensor is also known as the 'Heated Sensor Circuit' or 'Bank 1 sensor 2'.
With a modified exhaust system, this sensor receives A Higher Exhaust Temperature and A Higher Exhaust Flow Rate than Stock Exhaust Systems. This causes the ECU to read that the exhaust system is out of balance. When the ECU sees that the system is out of balance it throw's a code and drops into 'limp mode' (safe mode). When you add this O2 Simulator onto the Post Cat O2 Sensor, it will remove the troublesome O2 sensor from direct exhaust flow and sends the ECU the expected exhaust reading. Thus allowing your ECU to run the motor optimally.
This O2 Simulator simply is screwed on to your existing O2 sensor and the assembly is replaced into the O2 bung.
In this case the simulator is an extension tube
and is starting to make sense
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From: Guildford, Surrey, UK
CL55-AMG
Driven approx. 500 miles since Lamda extenders were fitted and no alarm yet. This also included a weekend of drag racing. I'll try and get it on a star to see if any events have been logged since mod was done. Another bonus it only cost £9 to declare the exhaust to the insurance company
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2008 Mercedes Benz E63
I just gutted both my primary and secondary cats. Car is louder. I could not believe how dense they were. My primary cats gutted themselves and clogged the secondary. I cut the tops off and hole sawed all the material out. It was a *****.
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S320
@ RichN2O,
Did you use the O2 sim or the O2/Lambda spacer to make sure the check engine lights does not come up once you got rid of the CATS?
Did you have to get the ECU re-coded?
My S320 needs to have both cats (left and right) replaced but because it is in Africa, it does not need to meet any emmissions regulations (plus fuel quality is not the greatest). So am just thinking of cutting off the CATs and putting a pipe sraight through and then get the spacers so I do not get the check engine light.
Also, did you just buy 2 spacers (one for each side) or did you get 4 (2 for each side; pre & post)
Cheers
H
Did you use the O2 sim or the O2/Lambda spacer to make sure the check engine lights does not come up once you got rid of the CATS?
Did you have to get the ECU re-coded?
My S320 needs to have both cats (left and right) replaced but because it is in Africa, it does not need to meet any emmissions regulations (plus fuel quality is not the greatest). So am just thinking of cutting off the CATs and putting a pipe sraight through and then get the spacers so I do not get the check engine light.
Also, did you just buy 2 spacers (one for each side) or did you get 4 (2 for each side; pre & post)
Cheers
H
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Joined: Feb 2012
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From: Guildford, Surrey, UK
CL55-AMG
@ RichN2O,
Did you use the O2 sim or the O2/Lambda spacer to make sure the check engine lights does not come up once you got rid of the CATS?
Did you have to get the ECU re-coded?
Also, did you just buy 2 spacers (one for each side) or did you get 4 (2 for each side; pre & post)
Did you use the O2 sim or the O2/Lambda spacer to make sure the check engine lights does not come up once you got rid of the CATS?
Did you have to get the ECU re-coded?
Also, did you just buy 2 spacers (one for each side) or did you get 4 (2 for each side; pre & post)
I'm not sure if this will work with NO CATS.
We did NOT have to re-programme ECU
Did nothing to the pre-sensors they are fine as they are
