Here is my tuners post on HP. Some files attached. It was posted a while ago. I think the HP files are current. I'll double check with him. He's been up a few times
Anyone Wanna Take A Look?

 

Yes it is happening during WOT therefore it is not an issue with the o2. It doesn't matter if it happens at 13psi or 19psi, the o2 would not cause this.

Did you swap coil packs like everyone suggested?

 

A pre turbo leak can cause the car to go lean when idling because air is pulled in thru the header giving the o2 bad readings. I wasn't sure if something similar to this was happening at high boost. But the afrs stay normal even when the car starts to flop.

I did not swap coil packs. If I push the car till it starts to have the issue, it throws a random misfire code so its not pinned down to one cyl.

 

Maybe zzp bov is fluttering open when it shouldn't?

Too many maybes. Thanks for all the input guys. Would be great to solve this puzzle.

 

I didnt read back to see how long you had this issue so I am assuming you just swapped to turbo and are working out the kinks. If so, is the MAF tube in facing the right way for airflow?

 

Yep I converted to turbo. Maf arrow is facing the flow

 

Should I replace the plugs and gap even smaller than .022?
Is there a chance my map is causing the problem

 

Lol I know what an exhaust leak does, but an o2 would never cause any problem at WOT like I said, because it's in open loop.

Over time coils weaken, just like a rechargeable battery holds less and less charge after you use it alot. If your coils have alot of miles on them all of them could be weak.

How close did you bring your plug gap? You could bring it down all the way to .016-.018, see if that does it. If it is in fact a weak coil problem this could eliminate that option.


edit: I just looked at the first tune there, but he said it was "completely redone" so IDK if that is still current. Has your tuner done a turbo LSJ before?

 

Okay, I should try .016 and see what happens?
He has done ss turbos before. He also owned one.

Did my sc tune back in the day too.

 

I think I know the problem, but I need to see the current tune. Try .016 but if what I'm thinking is right it won't help.

 

Whatcha think?

 

I gotta see the tune, I posted on HPT tell your tuner to post it on there

 

I also texted him. Thanks man, gunna change gap now

 

we're all here to help






well most of us i think lol

 

okay tried the gap change. didnt change the issue looks like ill be staying around 12psi on a turbo meant for 25+

tuner will be posting the newer files on the HP forum as well

 

you listed your fuel system as just 60# injectors, do you have any other mods as far as bigger pump, return style or boost reference?

13 psi, your car can see and make adjustments, once you get above a certain point your car cannot see and adjust for any longer

Please if you are going to own a turbo LSJ, go buy HP Tuners, it helps everyone else out. And a random misfire code may appear random to you, but if you are watching the PIDs in HP Tuners you can see the misfire counts per cylinder

 

Stock system besides the injectors. I have a tuner and he used HP. We spent many hours and multiple days working on the car.
He's tuned many sc and tc balts.

As for buying HP myself, I'm not much of a tuner, still learning about it. Didn't mean to be such an inconvenience for everyone?
I built a kit for $1500 and am able to run decent boost with no issues. I was just curious about anyone else who have built a kit instead of buying one from zzp for 3x that.

And yes. I did watch the misfire count using HP. It obviously misfires when the maf frequency drops, there wasn't any cylinder count that stood out after a few pulls

 

Let me ask 1 more question. Could a bad map be causing this issue? I am running stock map sensor

 

How does your MAP reading react when the car panics and dies? Is it smooth building and then falls?

I've seen cars exceed the MAP and have those issues, but the factory LSJ map is 2.5 bar and good to 22psi if it's working properly.

 

I'm going to check codes tomorrow and see, map might be one of them :x

 

Yes I also built my own kit

 

We are few and far between it seems like

 

nah a lot of guys do their own thing they just don't post them

 

So I got a map sensor correlation code 0069

 

I built my own kit as well

that code means that the MAP and MAF sensor arent agreeing on the amount of air/pressure

Im not saying your an inconvenience, we all have to learn, but whether you are a tuner or not having HPT helps in cases like this, because you can log things and post them without needing your tuner around. It also allows you to change tuners or allow multiple tuners access.

You would need HPT to answer the questions I was looking to ask.

Here is a scenario for you:
The 60lb injectors cant keep up, car begins to lean out which causes a fluctuation in pressure inside of your exhaust manifold. Since the turbo is speeding up/slowing down from the fluctuations. There is a pressure drop/gain on the cold side which causes the maf reading to increase/decrease. Your car then fails the MAF sensor and begins attempting to read the MAP sensor, you arent fully tuned for the MAP sensor or are seeing pressures that your MAP sensor cant read, it again attempts to read MAF and verify BARO, things arent matching up, it trips the correlation code alerting you something is wrong.

Now in order for us to test this, we would need to see actual logs of your car, something that your tuner isnt getting into a hurry to post. It would be easy to tell if we could see the Injector Duty Cycles.

Did you remove the coolant system from your intake manifold and if so did you remove the Intercooler pump? if so then check and verify that the knock sensor isnt unplugged.

Everything you are describing points to fuel to me, I know you dont want it to be but its obviously not spark, if it were spark you would be seeing much more misfire honestly, even at 13 psi of boost you would see significant cylinder pressures and would see at least some misfires.

I dont know anyone running a turbo LSJ on less than 80s with that much boost pressure.