Interpreting data. VS s3 Log

[MAGP]

I have just tried to view your 2nd log and following the procedure here nothing is happening. I've never viewed a log before so I am just going by that page to try and get it working so I can try and help some more.

[yoda69]

You're correct, MAF is same for 3.8 V6 and 5.0 V8.
From my info part number is 25179556 and this supersedes part number 25008316.
Have you installed with standard VS3 intake plumbing or modified?
MAF needs to be fitted in a straight section of pipe and in same orientation as factory to ensure airflow through it is the same. If fitted near a bend and rotated 90 degrees airflow through it can be very different.

[Whyzee]

Are there any markings, part numbers on this memcal? Are you able to identify it using the Memcal ID Tool?

It's not an original tune - it says something like VS V8 Sequential HSV 195 or something like that on it. I'll try the memcal ID tool, otherwise I have a CPND memcal that I might try today (was recalled and replaced with DRRS).

Have you installed with standard VS3 intake plumbing or modified?
MAF needs to be fitted in a straight section of pipe and in same orientation as factory to ensure airflow through it is the same. If fitted near a bend and rotated 90 degrees airflow through it can be very different.

Actually, it is rotated 90 degrees for clearance and does have a bend immediately before the maf (in the airbox lid). I'm using the VN V8 style airbox lid as I've been unable to find a VS lid that'll accommodate a MAF - I'll sort something soon though. Would removing the lid altogether be good enough for testing?

I have just tried to view your 2nd log and following the procedure here nothing is happening. I've never viewed a log before so I am just going by that page to try and get it working so I can try and help some more.

I'm only just learning how to log, but here's how I did it:
-Opened tunerpro 5 rt
-Open the DRRS Bin found here viewtopic.php?f=7&t=3
-Open the ADX found here (VT_$A6): viewtopic.php?f=10&t=29
-Open the XDF found here for the VS v8 s3: viewtopic.php?t=5&f=7

Then you can open the log file and press the play button. To view data, choose 'show dash' or 'show data lists' under the aquisition tab

[immortality]

Can you confirm what PCM you are running and what wiring loom you are using?

The issue I see is that the VS V8 only used the single O2 sensor but I'm fairly sure the VT uses 2, one for each bank and the VT PCM will be looking for that signal input.

This the the VT Power Train wiring diagram VT s1 V8 Power Train Wiring Diagram 5b

[Whyzee]

Have you installed with standard VS3 intake plumbing or modified?
MAF needs to be fitted in a straight section of pipe and in same orientation as factory to ensure airflow through it is the same. If fitted near a bend and rotated 90 degrees airflow through it can be very different.

At the risk of speaking too soon...I removed the airbox lid altogether and went for a 20k drive. You wouldn't believe this, but I think this must've been one of the reasons it was running so lean. Under load it actually richens to 12.5-14 depending on roadspeed which is a huge improvement.

Can you confirm what PCM you are running and what wiring loom you are using?

The issue I see is that the VS V8 only used the single O2 sensor but I'm fairly sure the VT uses 2, one for each bank and the VT PCM will be looking for that signal input.

VT definitely uses 2, and the VS uses 1. The VS and VT are supposed to use the same PCM (531). Using the VT loom which i've modified where it connects to the body loom - the engine management side of things hasn't been touched.

[immortality]

So you will need to sort out the 2nd O2 sensor input as the earlier screen shot is showing a problem there which will stuff up how it runs in closed loop mode.

Sounds like you may possibly have found the issue as those AFR's sound right for normal operation.

Factory airbox is a POS anyway so you may as will ditch it and fit a decent CAI.

[Whyzee]

So you will need to sort out the 2nd O2 sensor input as the earlier screen shot is showing a problem there which will stuff up how it runs in closed loop mode.

Sounds like you may possibly have found the issue as those AFR's sound right for normal operation.

Factory airbox is a POS anyway so you may as will ditch it and fit a decent CAI.

Ah okay, I've just unplugged it for the time being... I don't know if the VS memcal/tune even looks at the data from those ecu pins though? In that screenshot it's the 'right hand' o2 sensor that's wired up (when it was running ridiculously lean). The 'left hand' o2 sensor is disconnected and the reading doesn't change from 451mv.

Yeah I can't believe that it made such a noticeable difference straight away. I'm still not going to call it solved yet though lol

[Dylan]

VS 3 enhanced bin has an option for 1 or 2 sensors in the xdf just flag 1 or 2.

[MAGP]

Yes VT1 uses 2 O2 sensors but you are using, from what you have said, a VS3 memcal so you should only need 1 O2 sensor. The PCM is the same between the two.
There is, obviously, some difference in the engine loom between VS3 and VT1 from the O2 sensor to the plugs into the main loom. I am wondering if removing the O2 sensor wire that isn't connected at the exhaust from the PCM would make a change in the engines running.

[immortality]

The way I see it, if you are going to the hassle of swapping over to the VT MAF style full sequential injection then you are best off getting both O2 sensors working so the PCM can control bank fueling to get the full gains otherwise you may as well just stick with the VS MAP based system.