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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > I want to delete my secondary O2's, permanently



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      10-04-2017, 02:10 PM   #1
Faredo
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I want to delete my secondary O2's, permanently

I'm sitting here looking at purchasing my 3rd secondary O2, and im wondering why.
The fronts I understand but the secondary are a waste.
I know there is a DPfix but allegedly you shouldn't run this 24/7. Im not returning much from the googles, but surely, there is something i dont know of or at least in the works.
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      10-04-2017, 02:13 PM   #2
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Where have you seen the DPFix shouldn't be run permanently? Why are you having to replace your secondary O2 sensors?
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      10-04-2017, 02:20 PM   #3
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Quote:
Originally Posted by GATORB8 View Post
Where have you seen the DPFix shouldn't be run permanently? Why are you having to replace your secondary O2 sensors?
thread referring to 24/7
http://www.e90post.com/forums/showthread.php?t=1051701

Ive replaced one after the the element caused SES, One I damaged during a turbo install, and this current one I believe went out due to an oil leak into the connector. Ive since fixed the leak.
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      10-04-2017, 02:31 PM   #4
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Quote:
Originally Posted by Faredo View Post
thread referring to 24/7
http://www.e90post.com/forums/showthread.php?t=1051701

Ive replaced one after the the element caused SES, One I damaged during a turbo install, and this current one I believe went out due to an oil leak into the connector. Ive since fixed the leak.
Yeah running a perm. DP Fix tends to lead to AFR issues since it uses the rear signals as some kind of calibration deal for the primaries.
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      10-04-2017, 02:31 PM   #5
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Quote:
Originally Posted by Faredo View Post
thread referring to 24/7
http://www.e90post.com/forums/showthread.php?t=1051701

Ive replaced one after the the element caused SES, One I damaged during a turbo install, and this current one I believe went out due to an oil leak into the connector. Ive since fixed the leak.

Thanks for the link, I have one on order and that was my plan.

They do mention in the thread that you could run dual dpfixes, the issue with one is that it only uses one signal as basis for the modified signal and feeds the modified signal as both to the car.
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      10-04-2017, 02:42 PM   #6
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Here's the basic parts. Notice the use of one input two outputs.

IIRC from college, output voltage is the same regardless of the split, so the same setup should work if made for each bank.

EDIT: Here's what it's doing: http://www.ohmslawcalculator.com/vol...der-calculator
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Last edited by GATORB8; 10-04-2017 at 02:52 PM.
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      10-09-2017, 05:43 PM   #7
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Quote:
Originally Posted by GATORB8 View Post
Here's the basic parts. Notice the use of one input two outputs.

IIRC from college, output voltage is the same regardless of the split, so the same setup should work if made for each bank.

EDIT: Here's what it's doing: http://www.ohmslawcalculator.com/vol...der-calculator
Thanks for the reply, are you going to modify the xkitty for 2 ECU outputs? or are you making your own?
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      10-10-2017, 09:56 AM   #8
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Quote:
Originally Posted by Faredo View Post
Thanks for the reply, are you going to modify the xkitty for 2 ECU outputs? or are you making your own?
I started to look into it, but as long as the tune takes care of it, I'm just going to go that route.

You would realistically just need two x-kittys, just use each input to each output.
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