Unitronic Stage 1+ Only Getting 15psi

[CrazyCal]

Groups 114 - 115 - 003
3rd Gear Pull
and
5th Gear Short Pull - long enough to hear the assumed fuel pump and/or misfire issue at WOT in higher gears.





Group 031
3rd Gear Pull
and
5th Gear Short Pull - long enough to hear the assumed fuel pump and/or misfire issue at WOT in higher gears.

[walky_talky20]

Nice improvement here. N75 duty is much more normal here at ~70%. Looks like you must have got out of the throttle after 4500. Would have been nice to see the run to 6k like before. But it seems you're having a misfire issue with this new found boost, yeah?

Looking at your AFR logs (eyes are nearly bleeding now, lol) 3rd gear pull looks ok. 5th gear pull looks like it goes lean at the end. I'm guessing you captured a bit of the miss, then backed out. The target AFR goes from ~13.4 to ~11.5 all at once and it doesn't make it. From your log I can't tell what RPM this is at, or what your foot was doing, so it's hard to say.

[CrazyCal]

So, I am leaning a bit. What other block should I run in pair with 031 (Lambda) to zero in on this a little more? Obviously something with RPM (Maybe 115) so you can see that too.

How can I see what the fuel pump is doing?

Perhaps check voltage at the coilpacks?

It is odd that it only happens in higher gears when there is heavy load on the engine. Seems like it would be throwing more fuel at it in that situation which is why I suspect the fuel pump.

[walky_talky20]

There isn't anything you can log for fuel pressure. You'd have to slap a physical gauge on it to see that. Has the filter ever been changed? Not sure if you mentioned that already.

I'd probably add block 001 to the 031 log so we can see RPM and instant fuel trim. And maybe block 020 so we can see timing pull.
I'd like to get the text for the above AFR logs to do a graph of those.

[CrazyCal]

Yeah fuel filter has been changed.

I'll grab those logs on my way home this morning. And I'll post them and send you the text versions.

Sent from the Wretched Hive of Scum and Villainy using tapatalk 2

[CrazyCal]

3rd gear pull...



5th gear pull on a hill where the missing is most prominent...



5th gear pull on flat ground...




Sending raw data to you now...

[CrazyCal]

Lambda bank 1 percentage seems to fluctuate drastically. Is that normal?

Sent from the Wretched Hive of Scum and Villainy using tapatalk 2

[CrazyCal]

*Not Solved*

[CrazyCal]

There's still slight hesitation present. New FSI coilpacks installed, so coilpacks are eliminated as an issue. I have a few more things to try:

-My injector seats are grimy. They'll be replaced this week with billet units after my IM and VC get powdercoated.

-I have a slight exhaust leak around the exhaust manifold/cat area. All new gaskets for that entire area are in my parts pile along with 034 replacement studs for the head. Waiting for the rest of my exhaust to do a full install all at once.

-I am running stage 2 with only a gutted cat instead of a testpipe (in the parts pile). This could be a factor as a matter of flow restriction. Just a guess. Most people say no, it's not an issue, but who knows...again, waiting to install new exhaust to get to this.

-Turbo will be replaced with a K04 unit.

Anyway, it's still a continuing project.

[newhandle]

^ how are those valves affecting anything if they're not actually hooked up to your DV, even if they're incorrectly blocked. My valves are just sitting there to avoid CEL, and I believe the N249 is blocked incorrectly in my case as well.

[CrazyCal]

^ how are those valves affecting anything if they're not actually hooked up to your DV, even if they're incorrectly blocked. My valves are just sitting there to avoid CEL, and I believe the N249 is blocked incorrectly in my case as well.

They're not unless they're attached to a vacuum source. Edited.

[FNK]

CrazyCal,
In the end, have you solved the problem?

1. Wastegates was low for stock boost of 8~12PSI (15PSI opening is normal), required an adjustment.
2. Fuelling, your injectors duty cycle are way too high, signaling fuelling problem from the small size.