Ghostrider

And that is exactly what I have... LC-1 installed A/F gauge where the ashtray used to be.

I got the LC-1 because it can be wired up to mimic the factory narrowband signal. I just think that if you removed the primary cats with the LC-1 installed then it will not throw a CEL. When I get everything installed we will find out.

silence

the lc1 "mimics" the factory signal- what that means is that you can replace the factory sensor with it so that you can get a wideband signal AND a factory type signal. That doesn't mean it fakes it from nothing- it's still transmitting a narrow band signal from what it is reading... IF the reading with the factory sensor would throw a code it will still throw the same code.

silence

another one of those comments that makes me think twice about buying your products... why would a wideband sensor not measure below 12 afr? (i def. have my car tuned to run 11-11.8 at wot based on my ngk afx's measurements)

Ghostrider

Gotcha!!

ProjectC55

Dude start a thread with your custom exh on the CLK pg, please dude your killin us by delaying!!

W208 CLK55 and C43 share the same exh.

SeeKlasse

ok so is it concluded to be better to have the lc1 o2 sensor replacement or better just to rearrange the pre-existing o2 sensors in the exhaust system? i dont know too much about how o2 sensors work, but wouldnt it be better to have an actual sensor there to deliver accurate realtime information pertinent to the environment in the exhaust as opposed to a "dummy" o2 sensor that keeps telling the ecu that everything is ok... and how would a simulated o2 sensor know if theres some kind of problem and throw a code if its not really a sensor at all....

silence

it is better to keep the factory sensor if it is functioning properly

the lc1 signal isn't from a dummy sensor (it's just that it turns the wideband info that it's reading into a signal useable for your ecu) it's from a real sensor that's giving it ostensibly the exact same readings that the stock sensor woudl send in the same location.


it is absolutely best to keep giving the ecu a "real" signal (from stock sensor or from lc1 or the many others that allow similar function) as it will retain the flexibility etc. that allows the car to perform and get somewhat decent gas mileage etc.- although since our cars only have stock narrow band i don't know just how much control the factory really gives the 02 sensor anyways. Regardless it's best to leave it alone.

I chose to isntall my wideband slightly more to the rear of the car and retain stock sensors in stock locations for now.

I'd love to hear more information about the relocation of the stock sensors as applicable with the headers which delete primaries- do you just move then furthr downstream?

MarcusF

Both the O2 sensor before the cat and after the cat have the same job; to measure the oxygen content of the exhaust. They both communicate their findings by sending the ECU a low voltage signal. If the exhaust is lean, the oxygen sensor will produce something below 0.3 volts. If the exhaust is rich, the oxygen sensor will produce something above 0.6 volts. The ECU uses the signal from the first O2 sensor for two things; (1) to know which way to adjust the air/fuel mixture when in closed loop mode, and (2) to get a baseline for the second O2 sensor. If the reading from the second O2 sensor is the same as the first O2 sensor, or the signal rapidly swings back and forth from lean to rich and back while in closed loop mode (which is common for the primary O2 sensor), then the ECU will assume the cat is not working.

Hopefully this helps you understand what O2 sensors do, and what the ECU does with that reading.

Ghostrider

I got into a fight with the dealership... But we're back friends again like Puffy and Steve Stout.

That's not a bad idea... Can someone post a picture of their stock C43 exhaust?

ProjectC55

It's the exact same as the W208 clk55 coupe,trust me! The Kleeman headers especially. They r labled W202/208 headers.

ProjectC55

Yes,As long as u have the primary O2's b4 the secondary cats and the secondary O2's just behind the secondary cat's u r good to go. The Kleemann headers actually come with bungs for placement of the primary O2's. You need to place bungs just behind the secondary cats for the placement of the secondary O2's.

silence

i do not have 02s after my secondary cats...

NitrogenBalance

You should have O2's before and aft your primary cats in a stock configuration. He was referring to the configuration that he currently has which has deleted the primary cats and retained the secondaries. In which case you would cut and paste the O2 locations that read from the primary cats down to the secondaries once the primaries are removed.

NitrogenBalance

Not pointing any fingers here but isn't this kinda beating a dead horse? This stuff has been posted all over this site for several years......

OT.... silence I apologize for never getting back to you with the AMG ML55 cover part #. As I'm sure you can relate I'm very busy and don't always have time or the memory to dig this stuff up. Gonna go see the car this weekend and I'll make a point to grab it if you still need. IMO I would hold off on any 430 covers and look for the AMG cover as it holds true to the nature of the beast.

SeeKlasse

i dont think the horse is dead enough. C55, how much did you pay for your kleemann headers, how much is a reasonable price to pay?

ProjectC55

ProjectC55

Read post #64

myc43amg

Dr. C36, I deleted the secondaries and left the primaries alone. The sound is fantastic! At first I gave the cars some gas and it sort of stalled on a certain spot. But a few blocks down the road it all went back to normal. I also had asked the guys that work on my cars how much they would charge to remove the primaries and add new ones. They looked at the front cats and gave me a price of $90.00 for the complete job. These guys are cheap but do real good work.

I think thats a good price but I think I will pass because I think the cats you suggest might just make the car to loud. The sound right now is so perfect. I am however going to convert the SINGLE exaust setup with a duel. They said they can do it but I will have to modify the rear to be able to fit a small muffler. It wont be "TRUE" duel exaust, it will split somewhere near the middle (should sound SWEAT). I like the way cars look with TWO chrome tips coming out the back. I know it will take some thinking in order to make this work but its really not that hard, I've done much harder stuff. Can't wait to do this before the summer ends.

Thanks for the suggestions.

svt ricco

make video man! what set up are you running?

E55 PWR

Not surprisingly, it usually takes 3 days for ECU to fully adapt to new changes so thats why it stumbled at first. If you can do Primaires for $90 a pop DO IT. Get some high flow Vibrant, magnaflow, or Metal Cat 200 cell metallic core race cats and run those. If you want ECU to adapt faster you can do the ECU pedal reset trick and that usually speeds up the process.

single pipe exhaust systems are lighter in weight, that is one big advantage and they also give great torque response b/c of the Y-pipe. All good ideas. Sounds like you are on the right track. I'd love to hear/see video as well.

myc43amg

I will make one as soon as I can start on this. The setup? I have everything stock except I removed that muffler looking thingy which silence the sounds. And I removed the rear cats and ran 2 straight pipes the same size as stock.

Runs and sounds like a different car.

myc43amg

Yes, the ecu was thrown off but back to normal. As far as the price, its $90.00 to remove BOTH cats AND replace with newer ones. I'm just not sure how the car will sound with better flowing cats. The better they flow I'm thinking the more noisier they are? If my front cats ever go bad I will than replace the cats and putt back the sound damper muffler thingy to keep the noise down some.

In regards to your comment "single pipe exhaust systems are lighter in weight, that is one big advantage and they also give great torque response b/c of the Y-pipe" do think splitting the exhaust to TWO pipes will cut down the power? I dont think it will since most NEWER amgs and other HP cars have the duel exhaust?

svt ricco

are you talking about the resonator? its located almost underneath the front seats

SeeKlasse

is it bad to leave the resonator in? wont taking it out and putting metal cats all through the exhaust system going to make the exhaust drone at highway speeds?

SeeKlasse

what size cats do i need to purchase if im intending to replace the secondary cats. 2.5 inch?