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Thread: Logging Boost in Unused Consult Data Registers?

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Posts: 1-10 of 23
2011-02-13 21:30:41
#1
Logging Boost in Unused Consult Data Registers?
There must be a way to do this. The trick will be finding an unused register to pump the MAP voltage into safely that also has a pin on the ECU harness for this register.

The "Right Hand Air Flow" seems like the best choice. Does anyone know the address of this register? Where can I find a diagram of the stock ECU? But our ECUs probably do not have circuitry for this at all.

Are there any pins that are unused that actually connect to the board? Maybe I can wire it strait to my Calum daughterboard instead.
2011-02-13 21:55:17
#2
ok, on second thought, I should probably use something that actually exists on our cars since I actually need to get the signal into the ECU. I think the rear o2 sensor would be perfect for this. Anyone know the address of the rear o2?

EDIT: found the register number here: http://www.plmsdevelopments.com/images_ms/Generic_Nissan_ECU_Sensor_or_Data_register_table_Ver_2.pdf


RR O2 Sensor Voltage Single byte 0x35

so register number is 35, but what is the address?
Last edited by Will on 2011-02-13 at 22-21-43.
2011-02-14 05:05:07
#3
Let me look in with a HEX editor. Our current registers only go to 27. FYI when you see FFFF = blank, free to use .

EDIT: x35 value is FFFF (Blank) but x36 is 340D
Last edited by Vadim on 2011-02-14 at 05-23-00.
2011-02-14 05:57:32
#4
That would be awesome if that can be figured out. Or if even a wideband can be wired in for our ecus to use. Like the LC-1 I think can simulate narrow band readings into an ecu, but don't know if that would work on ours. What do you guys think?
2011-02-14 15:27:47
#5
Originally Posted by xavi1320t
That would be awesome if that can be figured out. Or if even a wideband can be wired in for our ecus to use. Like the LC-1 I think can simulate narrow band readings into an ecu, but don't know if that would work on ours. What do you guys think?


It should be possible. It would allow you to eliminate the front O2 sensor. Then you will have just one sensor for wideband and front O2. This is how I'm planning on running mine. Also save me on wiring .
2011-02-14 15:54:02
#6
Originally Posted by Vadim
Let me look in with a HEX editor. Our current registers only go to 27. FYI when you see FFFF = blank, free to use .

EDIT: x35 value is FFFF (Blank) but x36 is 340D


but what is x36? the calum eliminates the rear o2 sensor correct? so it probably is x35? The problem is that I need a register with an actual input wire but that I don't need to actually use, like the rear o2.

Originally Posted by xavi1320t
That would be awesome if that can be figured out. Or if even a wideband can be wired in for our ecus to use. Like the LC-1 I think can simulate narrow band readings into an ecu, but don't know if that would work on ours. What do you guys think?


I can just turn off the correction from the o2 sensor anyway, thats how I have had it, with my wideband in the stock o2 location and logging my a/f in NDS

Originally Posted by Vadim
It should be possible. It would allow you to eliminate the front O2 sensor. Then you will have just one sensor for wideband and front O2. This is how I'm planning on running mine. Also save me on wiring .


With the Calum can't I just eliminate the front o2 by changing the correction to D1 or whatever? I think that's how I have it currently, with no front o2 sensor and the car is running better than ever.
2011-02-14 16:17:38
#7
Originally Posted by Will
but what is x36? the calum eliminates the rear o2 sensor correct? so it probably is x35? The problem is that I need a register with an actual input wire but that I don't need to actually use, like the rear o2.


Incorrect. Calum resistor patches it. Same thing you would do when you try to bypass it. ECU still knows it exists.

Originally Posted by Will

I can just turn off the correction from the o2 sensor anyway, thats how I have had it, with my wideband in the stock o2 location and logging my a/f in NDS


Stock location physically?

Originally Posted by Will

With the Calum can't I just eliminate the front o2 by changing the correction to D1 or whatever? I think that's how I have it currently, with no front o2 sensor and the car is running better than ever.


No you can't. By disabling that you are disabling self learn essentially. OBDII ECU's heavily rely on the front O2 sensor to provide data. My car would run very dodgy when I would disable Front O2 feedback. Like super lean in boost for 1-2 seconds.
2011-02-14 16:20:32
#8
Originally Posted by Vadim
Incorrect. Calum resistor patches it. Same thing you would do when you try to bypass it. ECU still knows it exists.

Stock location physically?


No you can't. By disabling that you are disabling self learn essentially. OBDII ECU's heavily rely on the front O2 sensor to provide data. My car would run very dodgy when I would disable Front O2 feedback. Like super lean in boost for 1-2 seconds.


hmmm... mine seems to run great without it
2011-03-01 03:48:39
#9
This is awesome with you 2 (vadim and will) trying to figure it out, I know Im all confused about to even adjust to get an sr running. Would we be able to do the same on a Nistune if anybody has an idea? Im planning on going with a Nistune being Calum RT are harder and harder to find nowadays. Great work btw you guys. I highly admire our people that keep their dedication top notch. Keep it up guys. Thank You!!!!! :-)
2011-03-01 04:14:47
#10
Originally Posted by xavi1320t
This is awesome with you 2 (vadim and will) trying to figure it out, I know Im all confused about to even adjust to get an sr running. Would we be able to do the same on a Nistune if anybody has an idea? Im planning on going with a Nistune being Calum RT are harder and harder to find nowadays. Great work btw you guys. I highly admire our people that keep their dedication top notch. Keep it up guys. Thank You!!!!! :-)


Don't you currently have a Calum RT?

Tuning is hard to grasp of, but once you get an idea it's doable. It's just hard for me to come up with a base tune to a setup without being there to test it. What I think will work, might not work so well in real life haha .
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