turning off deceleration fuel cut off
Moderator: Matt
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turning off deceleration fuel cut off
I'm going to calibrate my Z32 maf translation and I wanted to know what table and what inputs I would have to make to turn off the (DFCO).
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- Posts: 36
- Joined: Thu Dec 11, 2008 8:02 am
The table you search is "TP load limit" or "Theoretical Pulsewith (Lad) Limit".
It is short described in the document: http://www.plmsdevelopments.com/files/n ... basics.pdf at page 16 (15 is shown in the footer of the doc).
It is short described in the document: http://www.plmsdevelopments.com/files/n ... basics.pdf at page 16 (15 is shown in the footer of the doc).
Nissan S14a (SR20DET) :-)
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- Posts: 36
- Joined: Thu Dec 11, 2008 8:02 am
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- Posts: 36
- Joined: Thu Dec 11, 2008 8:02 am
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- Posts: 36
- Joined: Thu Dec 11, 2008 8:02 am
I want to take it off so I can better tune my maf translation when reading logs.
I want to modify my maf translation that way when I command an afr number I get that number or close to that when I'm driving. Otherwise its just an arbitrary number in the map to get a desired afr. Most professional tuners using HP tuners or efi live etc. almost always calibrate the maf. My Friend tunes LS1s for a living and he couldn't believe I wasn't doing this at the time, said something about hack tuning lol.
There seems to be some misconception that because nissan presents a maf translation (for a z32 maf in my case) that it is accurate for every (z32)maf. When in fact if you have two of the same mafs they'll never be exactly the same. Which is why I have to command a 10.0 in my fuel map to get an 11.6. This is B.S. when I could calibrate the maf to be more exact. Why should I have to work in filtered values when its easier to just put in a desired afr in the map and get it when I'm driving.
I want to modify my maf translation that way when I command an afr number I get that number or close to that when I'm driving. Otherwise its just an arbitrary number in the map to get a desired afr. Most professional tuners using HP tuners or efi live etc. almost always calibrate the maf. My Friend tunes LS1s for a living and he couldn't believe I wasn't doing this at the time, said something about hack tuning lol.
There seems to be some misconception that because nissan presents a maf translation (for a z32 maf in my case) that it is accurate for every (z32)maf. When in fact if you have two of the same mafs they'll never be exactly the same. Which is why I have to command a 10.0 in my fuel map to get an 11.6. This is B.S. when I could calibrate the maf to be more exact. Why should I have to work in filtered values when its easier to just put in a desired afr in the map and get it when I'm driving.
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- Posts: 36
- Joined: Thu Dec 11, 2008 8:02 am
I've spent a bit of time just then looking through the code
All the address files based from 8 bit ECUs have the FUEL CUT/RECOVER but none of the 16 bit stuff does
The closest I can find on S13 SR20DET is
FUEL_CUT,&H0350,16,1,16,1
FUEL_RECOVER,&H0360,16,1,16,1
If you edit your address file and add these two lines, see if it works for you?
Those are both temperature based lookup tables and they are next to each other. There is a speed check before using them and they are just after the RPM/Speed limiter checks in the code, similar to J30 VE30 code which I was comparing against
So those are the closest I can see which match upto the ones in the 8 bit ECUs. No guarantee they are the right addresses but I'm pretty sure they will work
All the address files based from 8 bit ECUs have the FUEL CUT/RECOVER but none of the 16 bit stuff does
The closest I can find on S13 SR20DET is
FUEL_CUT,&H0350,16,1,16,1
FUEL_RECOVER,&H0360,16,1,16,1
If you edit your address file and add these two lines, see if it works for you?
Those are both temperature based lookup tables and they are next to each other. There is a speed check before using them and they are just after the RPM/Speed limiter checks in the code, similar to J30 VE30 code which I was comparing against
So those are the closest I can see which match upto the ones in the 8 bit ECUs. No guarantee they are the right addresses but I'm pretty sure they will work
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c:\program files\NIStune\address\s13_sr20det_256_E_test fuel cut recover.txt
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this is what it tells me when I try and enter those two lines and save them in notepad.
You don't have permission to save to this location.
Contact the admistrator to obtain permission.
Would you like to save to documents folder instead?
this is what it tells me when I try and enter those two lines and save them in notepad.
dont know whats going on with your computer there
i've attached the modified file here, save this onto your PC and the tables will show up with this version
i've attached the modified file here, save this onto your PC and the tables will show up with this version
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- S13_SR20DET_256_E.adr
- S13 SR20DET + fuel cut/recover tables
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