OTS 2.05 Stage 2 UEL 91 Map - Need help to understand this log

[Boofneenee]

Maybe their is debres on. The MAF sensor? Hair, dust or something like that? Pop it out inspect and maybe blow on it?

[Wepeel]

Originally Posted by steve99

Yep mine is the same 3-4% at idle and only about 1-2% everywhere else pretty well spot on, looks like I won't even need to touch it up

Originally Posted by solidONE

Very strange... when I loaded v2.0 on my car with stock intake and drop in filter, the MAF scale was pretty friggin good. LTFT under 3% at idle and low rpms. It's a head scratcher.

Mine is good too - Stage 2 93 2.0x. I'm within +/-3% most of the time, occasionally up to 3.9. Although, I do peg rich under WOT once I cross 5k rpm - can't figure that one out. Maybe I don't have enough learning in the highest airflow ranges.

[solidONE]

Originally Posted by Wepeel

Mine is good too - Stage 2 93 2.0x. I'm within +/-3% most of the time, occasionally up to 3.9. Although, I do peg rich under WOT once I cross 5k rpm - can't figure that one out. Maybe I don't have enough learning in the highest airflow ranges.

The stage 2 maf scale is a bit more "generous" in closed loop operation to account for the more free flowing stage 2 setups such as those that run complete catless big bore exhausts. Doing a rescale in closed loop using VGI's app will get you closer to target AFRs.

[ssyed]

Originally Posted by steve99

MAF sensors are not perfect and depending on what temps the original scaling were done thy can be out a few degrees. Its not unusual for stock cars to be out 8% in places so add a bit of temp variation and 12% is not out of the question. thats why people go to the trouble of doing their own individual maf scaling

If its only off idle it just might make car a bit hessitant as you start off, it not rearly a huge drama.

So Steve, it looks like you were accurate about the MAF sensor being off. I did a whole bunch of logging today, learnt how to scale the sensor and the fuel trims are no longer -20ish.


I still need to touch up the scaling didn't get to do much logging around 2.5-3.25 maf volts. (I've included a pic to show how big the gap was.)

Btw, can you guys please look at this log and tell me what else I need to fix? Does everything else look normal?

This is the log, right after flashing with the scaled MAF.
http://www.datazap.me/u/ssyed/205-st...ata=6-7-8-9-11

Thanks again for all of your help

[steve99]

Originally Posted by ssyed

So Steve, it looks like you were accurate about the MAF sensor being off. I did a whole bunch of logging today, learnt how to scale the sensor and the fuel trims are no longer -20ish.


I still need to touch up the scaling didn't get to do much logging around 2.5-3.25 maf volts. (I've included a pic to show how big the gap was.)

Btw, can you guys please look at this log and tell me what else I need to fix? Does everything else look normal?

This is the log, right after flashing with the scaled MAF.
http://www.datazap.me/u/ssyed/205-st...ata=6-7-8-9-11

Thanks again for all of your help

Looks heaps better yes bit around 2.4v a bit off but only 4% so not a major drama, you usually need a couple of tries to get it spot on. elsewise looks ok tiny bit of knock around 3000 but nothing to worry about.

[ssyed]

Originally Posted by steve99

Looks heaps better yes bit around 2.4v a bit off but only 4% so not a major drama, you usually need a couple of tries to get it spot on. elsewise looks ok tiny bit of knock around 3000 but nothing to worry about.

With that much knock, are you sure its not going to be an issue? I am pretty scared about it lol. Also I have no knowledge of how to fix knocks. Also do you think these knocks could be related to MAF scaling? or whats causing it? fuel?

[steve99]

Originally Posted by ssyed

With that much knock, are you sure its not going to be an issue? I am pretty scared about it lol. Also I have no knowledge of how to fix knocks. Also do you think these knocks could be related to MAF scaling? or whats causing it? fuel?

Knock of 0.7 or less on occasions in the 2000-3500 area seems almost inevitable if it more than that then you can pull a bit of timing or its happening every time you pass through that area. if its only an intermittent short term spike of 0.7 or less on occasions its almost impossible to totally eradicate at high load low rpm when you jump on throttle. just knock it back a gear.

bit more reading my friend and you will be able to do it,knock correction its easier than maf scaling see links below on knock correction for australian fuels it applies to anyone.

[ssyed]

Originally Posted by steve99

Knock of 0.7 or less on occasions in the 2000-3500 area seems almost inevitable if it more than that then you can pull a bit of timing or its happening every time you pass through that area. if its only an intermittent short term spike of 0.7 or less on occasions its almost impossible to totally eradicate at high load low rpm when you jump on throttle. just knock it back a gear.

bit more reading my friend and you will be able to do it,knock correction its easier than maf scaling see links below on knock correction for australian fuels it applies to anyone.

Thank you! So, in my log, FL Knock correction reached a spike of -1.22 at one point. And Knock Correction reached a max of -0.275

the FL knock correction is the value the one i would need to fix to avoid knock or is the the knock correction?


thanks for being so patient and replying to all of my annoying questions

[steve99]

Originally Posted by ssyed

Thank you! So, in my log, FL Knock correction reached a spike of -1.22 at one point. And Knock Correction reached a max of -0.275

the FL knock correction is the value the one i would need to fix to avoid knock or is the the knock correction?


thanks for being so patient and replying to all of my annoying questions

if the -1.2 is consistent around that rpm/load point then pull about 0.7 to 1 degree in the cells around that point as per the knock correction thread have a look at the tables their.to get some idea.