Theoretically yes!
If STFT is close to 100% then LTFT should also remain at 100% = happy days.
PL
AF Alpha Learn (LHS)
Moderator: Matt
Re: AF Alpha Learn (LHS)
Yes it will
Final injection = TP x STFT x LTFT x fuel coefficients (fuel map + temp enrich + throttle enrich) + injector latency
As you can see any change to STFT/LTFT affects final injection pulsewidth. Seems to be +/- 28% limits
Final injection = TP x STFT x LTFT x fuel coefficients (fuel map + temp enrich + throttle enrich) + injector latency
As you can see any change to STFT/LTFT affects final injection pulsewidth. Seems to be +/- 28% limits
Re: AF Alpha Learn (LHS)
That's the idea!
-
- Posts: 367
- Joined: Wed Jun 04, 2008 3:48 am
- Location: USA Socal
Re: AF Alpha Learn (LHS)
Hey Matt I have a concern on the B13 SR20DE are you sure that this target number isn't 128? Because on a stock B13 SR20DE by default these number start off at 128 on both STFT and LTFT
Re: AF Alpha Learn (LHS)
It depends on ECU type. Some Nissans have 100% (64hex) and others are 128 (80hex) which shows as 128%
There is a bit flag in the ECU part number which says if it is 100 or 128 for 100%. We do read this but it appears the intepretation may not be working correctly for some models. I've seen I think it was a S13 had LTFT at 128
There is a bit flag in the ECU part number which says if it is 100 or 128 for 100%. We do read this but it appears the intepretation may not be working correctly for some models. I've seen I think it was a S13 had LTFT at 128
-
- Posts: 367
- Joined: Wed Jun 04, 2008 3:48 am
- Location: USA Socal
Re: AF Alpha Learn (LHS)
Well I did some tuning on my B13's today and I learned/discovered that the target STFT is 100 and LTFT is 128, I was really able to dial this in quit quickly and nicely and while doing so I watched my O2 sensor come alive and start oscillating like it never has before at idle all the while mainting STFT @ 100 and LTFT @ 128.Matt wrote:It depends on ECU type. Some Nissans have 100% (64hex) and others are 128 (80hex) which shows as 128%
There is a bit flag in the ECU part number which says if it is 100 or 128 for 100%. We do read this but it appears the intepretation may not be working correctly for some models. I've seen I think it was a S13 had LTFT at 128
Now my P11 G20 is different it wants STFT @100 and LTFT @100.
Re: AF Alpha Learn (LHS)
I've been going through S13 SR20 code today and indeed LTFT is 0x80 when it is cleared (128% value) so it changes with some models
I'm out of time this week but will go through all models and update accordingly which ones need correction. Will change all to 0% and without the +28 offset in those difficult models
I'm out of time this week but will go through all models and update accordingly which ones need correction. Will change all to 0% and without the +28 offset in those difficult models
-
- Posts: 367
- Joined: Wed Jun 04, 2008 3:48 am
- Location: USA Socal
Re: AF Alpha Learn (LHS)
Matt wrote:I've been going through S13 SR20 code today and indeed LTFT is 0x80 when it is cleared (128% value) so it changes with some models
I'm out of time this week but will go through all models and update accordingly which ones need correction. Will change all to 0% and without the +28 offset in those difficult models
That's cool either way once you turn the car engine off and connect Nistune it display the target trims for LTFT and STFT and then you just aim to hit the marks, I really love this feature works awesome that combined with Active Test and Clear Self Learn and its childs play.