ECMlink Trying to dial in rough tune. O2 issues?

[dsmluck]

Just picked up a 90 Tsi AWD. Car is running an Evo 3 16g and PTE 1000cc injectors. The fuel rail and FPR look stock. The tune it came with was rough and the fuel trims were +/- 10%. I have gone through the guides and adjusted my global and dead time. Oddly the dead time suggested for these injectors, 450 caused the trims to go to -15% when the Airflowper rev is set to the 25 gm/rev range. Had to adjust it down to 280 or so to get trims back to near zero. My question is that in my log the 02 cycling looks bonkers. Is this normal and should I continue to dial in the MAF or do I have what looks to be a mechanical issue? I apologize for logging too much data. Its been a decade since I have owned a DSM and I am still learning the software.

 

[snowborder714]

The o2 signal looks normal.

Your MAF Comp values are a bit extreme in the transitions. Try to smooth them out so you don't have large jumps.

You'll want to update your firmware as you're using an old version.
ECMTuning, Inc.

 

[dsmluck]

The o2 signal looks normal.

Your MAF Comp values are a bit extreme in the transitions. Try to smooth them out so you don't have large jumps.

You'll want to update your firmware as you're using an old version.
ECMTuning, Inc.

Got it. Is it odd that my deadtime needs to be soo low on the PTE 1000's to get the idle trims right?

I am also concerned that AFRestimate (don't know exact name off hand) is usually showing I am running very lean all the time and yet my wideband and the way the car drives say otherwise.

Wideband shows 14.3 to 14.8 at cruise. Cant log it though as its a glowshift. Came with the car.

 

[954g63gst]

The dead time off the chart ecmlink provides is just a suggested starting point, and you will have to alter it depending on your setup or engine mods. You should select your rough mafcomp point right click and select adjust mafcomp. It will give you suggested points. Then smooth out your sliders

 

[snowborder714]

If you had to jack up your MAF Comp to get AirflowPerRev in check, then adjust the deadtime down that low to get CombinedFT in check, it is what it is. Just seems a bit odd to have MAF Comp that high.

 

[dsmluck]

If you had to jack up your MAF Comp to get AirflowPerRev in check, then adjust the deadtime down that low to get CombinedFT in check, it is what it is. Just seems a bit odd to have MAF Comp that high.

Ok thanks for the advice guys. I smoothed out the MAF Comp suggestions and the trims seem to be pretty good now.

WOT fueling still has an issue and I am thinking it is either mechanical of an issue with the wideband. It varies from 10.9 (low limit on wideband??) to 12.3. Every pull seems to net something a little different. I have logged two instances of 1.3 knock and many smaller ones in the .4 to .7 range out of 20 to 25 pulls. EGTs look ok. Targeting 11.5 with the fuel sliders set to 0. I will try to get a WOT log of it in the next few days.

Also is it normal for the PTE 1000's to be lumpy at idle. Its not horrible but its noticeably lumpy at 900 rpm idle. I read that a good tune can take care of that but nothing I have ever changed has seemed to affect the idle roughness.

I was hoping to take my time with tuning the car and getting things fixed but my daily blew its transmission shortly after I picked up this car and now unfortunately the Talon has no choice but to assume that role for a bit so I appreciate the help.

 

[Calan]

That MAFComp curve in the first log is textbook for a vac leak, most likely due to an open breather port on the VC or some other PCV system hack.

 

[dsmluck]

That MAFComp curve in the first log is textbook for a vac leak, most likely due to an open breather port on the VC or some other PCV system hack.

Yes the breather port on the left side of the valve cover is open to the atmosphere. Unfortunate there is no nipple on the intake to route it back to stock. Can I tap into the BPV dump tube near the intake and put a connection in the rubber hose there?