Just installed MR long tube race headers, eliminating the stock down pipes w/ cats. As i figured it would, it is now throwing o2 sensor code and says its running lean on bank 2. Will the o2 Sim resolve this?

BTW- This is installed on a 2003 G35 auto sedan.

 

they won't do anything for it running lean they just trick the sensor into not throwing the CEL... Check if you've got the newer ecu (the black one) and go with osiris if you can... If you've got the real early 03 sedan with the doggy door you probably can't tho

 

my date of production is 10/02 & the ecu isnt black.

 

any idea on why it would be running lean on bank 2 after this install?

 

long tube headers are pretty much the most free flowing exhaust mod you can do, so the volume of air that's flowing through is so much higher the ecu cant effectively compensate for it and it runs lean. There is a point where you can actually lose hp from too many bolt ons and no tuning... since you can't just do uprev like everyone else its a difficult situation tho. I would start by getting those extenders and getting the code to go away, any time the check engine lights on your ecu is running in a sort of limp mode, and it will hurt performance and mpg like crazy

 

Yes i know that these headers are very free flowing, you can actually hear the air going thru the long tubes...What are extenders? do you mean simulators? & what do you mean uprev? I would like to get my car reflashed or tuned, but havent been able to find anything on that...

 

yeah simulators, extenders, same deal. Basically you screw it into the O2 sensor bung and it extends it away from the exhaust flow so that it doesn't throw the code. The problem is that the factory sensor is calibrated to sense within a certain range of exhaust flow and when you exceed that it tells the ecu that somethings wrong and throws the code. Even if you are tuned and the A/F ratio is spot on it will still throw the code, and just moving it away from the exhaust flow will often fix the issue.

Uprev is the company that makes Osiris, which is the ecu reflash tuning software that everyone uses for our cars.. Its awesome. Amazing. The bees knees. But your ecu is incompatible... lol The early 03 sedans still use the older maxima ecus and aren't flashable, so unless you want to spend a lot of money or do a lot of work you're SOL in regards to tuning

 

I was looking to get this style o2 sensor simulator.
http://www.magnumtuning.com/en/produ...nsor-simulator

but it sounds like you are referring to this style, do both do the same thing?

http://www.ebay.com/itm/M18-O2-Exten...eab5e4&vxp=mtr

As for my ecu & tuning, that really blows! I m going to double check the ecu box color...

 

Get the second one, you can try local tuner shops as well they usually have them in stock.

 

Couldnt find any local shops that carried them, so i bought these instead....

http://www.ebay.com/itm/261064763128...84.m1439.l2649

 

how do i confirm i have the correct ECU that i can use Uprev ecu? my car is 10/02 2003 car w/o doggy trunk door. my ecu is in the silver/gold metal box with these #s

A64-000-LN4-2X08

 

look at it. The ones that work are black, the ones that don't are grey. I have some info at home I'll see if I can find it when I get off work

 

Also I believe that all 6MT's have the newer ecu, not sure tho.

If it looks like this you are good to go:
https://i.imgur.com/qko52.jpg

 

Mine is an 5AT

 

Crap! Mine doesnt look like that & has the wrong style plugs. Uprev told me it need to have rounded plug styles and not square.