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5 Volt wideband input mod for p28...good?

Old 11-02-2006, 07:48 PM
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Default 5 Volt wideband input mod for p28...good?

I have a PLX wideband, and I want to datalog it on crome pro. I saw this article on pgmfi.org http://www.pgmfi.org/twiki/bin/view/Library/O2InputMod and was wondering is this the only way to do it, or is there a better or different way. Also, is ther anything I have to change in crome pro to make it record the 5V input. Seeing whats out there, whats more popular, or is there a better writeup to this mod (Im not 100% following to where I jump the capacitor lead to once its desoldered)

Once this is done and I can datalog wideband...my turbo is getting put on finally! Yay! BTW, anybody in Ohio that is willing to TEACH me how to tune for cheap? I have everything needed but expirience... Thanks.
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Old 11-02-2006, 08:02 PM
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Default Re: 5 Volt wideband input mod for p28...good?

You don't NEED to do it. If you don't do the mod, the ECU will only ever see a lower voltage, something along the lines of 3.8v. It just means your ECU/datalogging will never display richer than a certain AFR, I think it works out to 17.XX:1 AF. There is more, and more accurate info on pgmfi.org, go check it.
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Old 11-02-2006, 09:05 PM
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Default Re: 5 Volt wideband input mod for p28...good?

Really? I thought it would cut out a little over 1 volt since the factory o2 doesnt read past 1 V. Im not hoping to go over 17a/f so i think ill do it w/o cutting/soldering anything else. Thanks for the info. I will look more into it on pgmfi tho.

Also, I just run the 5 v signal to the factory o2 input, bypass the factory o2 signal, disable o2 in the chip, and I only log wideband while tuning, correct? I know this is going to change the way the car runs once I do hook the factory o2 back up and re-enable the o2, but is it significant enough, or should I not worry about it, or do I just run it w/ the factory o2 always disabled even after tuning? sorry for all the questions, but I want to make sure I have this concept down right. Thanks again.
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Old 11-02-2006, 10:24 PM
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Default Re: 5 Volt wideband input mod for p28...good?

bump cuz i'll be interested in the same thing
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Old 11-02-2006, 11:53 PM
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Default Re: 5 Volt wideband input mod for p28...good?

I just took the wideband output from my plx controller to the o2 input, I didnt do any of that o2 input mod bs, and it works great when I datalog in ECUcontrol. I disabled my o2 in crome and left it that way, after you have a tuned map you dont need it.
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Old 11-03-2006, 10:30 AM
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Default Re: 5 Volt wideband input mod for p28...good?

Originally Posted by psycho_vince
Really? I thought it would cut out a little over 1 volt since the factory o2 doesnt read past 1 V. Im not hoping to go over 17a/f so i think ill do it w/o cutting/soldering anything else. Thanks for the info. I will look more into it on pgmfi tho.

Also, I just run the 5 v signal to the factory o2 input, bypass the factory o2 signal, disable o2 in the chip, and I only log wideband while tuning, correct? I know this is going to change the way the car runs once I do hook the factory o2 back up and re-enable the o2, but is it significant enough, or should I not worry about it, or do I just run it w/ the factory o2 always disabled even after tuning? sorry for all the questions, but I want to make sure I have this concept down right. Thanks again.
I just disconnected the o2 sensor entirely, and ran the wideband output to it, disable the o2 sensor in Crome, and have at it. I never reconnected my o2 sensor, you shouldn't really need to.
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Old 11-03-2006, 11:18 AM
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Default Re: 5 Volt wideband input mod for p28...good?

unless you dont wana burn out your wb sensor. just run the stock one, and if you tuned for partial throttle, then disable the o2.
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