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

[steve99]

Originally Posted by solidONE

Dude... did you forget to plug in your MAF sensor? Go check it right now 'cause your maf voltage is flatline in that log.

Although in your first log, the MAF looked fine... How does it idle? rough?

I think that was a monitoring glitch as the MAF flow rates are changing, if it was actually flatlining on measured volts yes it would be running like a dog and I suspect the ECU would throw a cel code

[ssyed]

Originally Posted by steve99

It might be worth just running the tune with the standard maf scale supplied in tune and see what that looks like.

If you were running the 3" maf scale definitly change to the 2.75 version supplied by perrin see end of this post

http://www.ft86club.com/forums/showthread.php?t=64790

If that no good try using the scale that comes with tune.

Did you use the "VGI MAF Scale Utility" to scale MAF (don't use Yikes it will do your head in at first)

No, I was running the 2.75" scale supplied by perrin. Currently I am on the scale that comes with the tune.

I first tried the VGI, but it didnt work, maybe because my maf voltage was flat. Then I tried the Yikes and just gave up. lol. Btw, I am not sure why the MAF sensor was flat line in the previous log, i didnt touch anything, might be a bug.

Also, I just went to my garage right now and did the following:
- Removed the O2 spacer
- Checked exhaust leaks
- Made sure all components of the intake were tight.
- Checked the MAF sensor

Everything looked normal. So did another log just now still showing similar results.

http://www.datazap.me/u/ssyed/205-st...g=0&data=1-6-7

I'm pretty sure now that it has to be the intake. Only if I can figure out how to scale this thing.

In terms of scaling it via VGI, am I going to scale only open loop or close loop? or both. If both, where do I see the new rescaled version?

btw, thanks again for all your help! cant thank you all enough

[steve99]

Originally Posted by ssyed

No, I was running the 2.75" scale supplied by perrin. Currently I am on the scale that comes with the tune.

I first tried the VGI, but it didnt work, maybe because my maf voltage was flat. Then I tried the Yikes and just gave up. lol. Btw, I am not sure why the MAF sensor was flat line in the previous log, i didnt touch anything, might be a bug.

Also, I just went to my garage right now and did the following:
- Removed the O2 spacer
- Checked exhaust leaks
- Made sure all components of the intake were tight.
- Checked the MAF sensor

Everything looked normal. So did another log just now still showing similar results.

http://www.datazap.me/u/ssyed/205-st...g=0&data=1-6-7

I'm pretty sure now that it has to be the intake. Only if I can figure out how to scale this thing.

In terms of scaling it via VGI, am I going to scale only open loop or close loop? or both. If both, where do I see the new rescaled version?

btw, thanks again for all your help! cant thank you all enough

to do closed loop scaling. will require some smooth driving steady throttle at low to mid rpm to get good data anout 20 minutes worth.

Then 3 runs WOT 3rd gear 2000 to redline for the open loop. Can all be done in one log and the utility will sort it all out

Log the parameters required, the VGI ulitliy has lots of help in the utility as well.

[Wepeel]

Originally Posted by ssyed

No, I was running the 2.75" scale supplied by perrin. Currently I am on the scale that comes with the tune.

I first tried the VGI, but it didnt work, maybe because my maf voltage was flat. Then I tried the Yikes and just gave up. lol. Btw, I am not sure why the MAF sensor was flat line in the previous log, i didnt touch anything, might be a bug.

Also, I just went to my garage right now and did the following:
- Removed the O2 spacer
- Checked exhaust leaks
- Made sure all components of the intake were tight.
- Checked the MAF sensor

Everything looked normal. So did another log just now still showing similar results.

http://www.datazap.me/u/ssyed/205-st...g=0&data=1-6-7

I'm pretty sure now that it has to be the intake. Only if I can figure out how to scale this thing.

In terms of scaling it via VGI, am I going to scale only open loop or close loop? or both. If both, where do I see the new rescaled version?

btw, thanks again for all your help! cant thank you all enough

So obviously some huge corrections still. I don't think it's the scaling - you went from LTFT's just under -20's to just over -20's. Maybe swap the stock intake back on, run the maps in their default form, and see if you still have large corrections. This would take the intake out of the equation.

(dunno how long swapping intakes takes)

[ssyed]

Originally Posted by Wepeel

So obviously some huge corrections still. I don't think it's the scaling - you went from LTFT's just under -20's to just over -20's. Maybe swap the stock intake back on, run the maps in their default form, and see if you still have large corrections. This would take the intake out of the equation.



(dunno how long swapping intakes takes)

That's what I was thinking of doing today. Shitty thing is I gotta take off the bumper to remove the intake. I don't mind the time. Just want to figure out what's causing it and to fix it.

[solidONE]

Originally Posted by steve99

I think that was a monitoring glitch as the MAF flow rates are changing, if it was actually flatlining on measured volts yes it would be running like a dog and I suspect the ECU would throw a cel code

Yeah you're right. I had the exact same thing happen to me before where the OFT wasn't picking up MAF voltages correctly. If there was an intake leak it should be pretty obvious at idle.

[ssyed]

Originally Posted by Wepeel

So obviously some huge corrections still. I don't think it's the scaling - you went from LTFT's just under -20's to just over -20's. Maybe swap the stock intake back on, run the maps in their default form, and see if you still have large corrections. This would take the intake out of the equation.

(dunno how long swapping intakes takes)

So I swapped the stock intake, flashed the 2.05 map (no maf scaling) and logged the car. the LTFT has gone down to -12 on idle. So I am guessing there is still an issue or is this normal?

does this mean i have an exhaust leak somewhere? I know I had issues with installing the nameless downpipe to the headers but it looks like there are no leaks

Any help with this would be appreciated.

[steve99]

Originally Posted by ssyed

So I swapped the stock intake, flashed the 2.05 map (no maf scaling) and logged the car. the LTFT has gone down to -12 on idle. So I am guessing there is still an issue or is this normal?

does this mean i have an exhaust leak somewhere? I know I had issues with installing the nameless downpipe to the headers but it looks like there are no leaks

Any help with this would be appreciated.

If its ok everywhere else except idle then its likely just the maf scaling is off a bit, you get a lot of intake air temp variation at idle and it throws the fuel trims off a bit.

exhaust leaks tend to throw the fuel trims positive..

[ssyed]

Originally Posted by steve99

If its ok everywhere else except idle then its likely just the maf scaling is off a bit, you get a lot of intake air temp variation at idle and it throws the fuel trims off a bit.

exhaust leaks tend to throw the fuel trims positive..

So the scaling could still be off even though I am running stock intake in this log?

[steve99]

Originally Posted by ssyed

So the scaling could still be off even though I am running stock intake in this log?

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.

[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.

[steve99]

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.

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

[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.

For the VGI scaling tool (close loop) do you know what is dv/dt? How am I supposed to log that?

[steve99]

Originally Posted by ssyed

For the VGI scaling tool (close loop) do you know what is dv/dt? How am I supposed to log that?

Don't worry about it it calculates that value just ignore it.