1Z Engine Performance Issues

Hello,

I have a G3 TDI with a 1Z engine.
I recently installed new injectors from AFN and increased the boost pressure. I also still have the chip from Princiotta installed.
I noticed how the performance increased with each individual component.
I now have a Skoda Octavia with a 110hp TDI engine. And it performs at least as well. I'll do some acceleration tests this afternoon, but considering all the work I've done on mine, it's running too poorly.
Even at top speed, I'm barely reaching 200 km/h, and considering I have a longer gear ratio (ASD), I really don't understand why.
"The Skoda is almost redlining in 5th gear. Mine just barely reaches 4000, maybe up to 4200, but it was probably going slightly downhill there."
When I display the measurement data blocks, everything is within the acceptable range.
What else could it be due to?
- I can already rule out issues with low fuel pressure and dirty injectors.
The recommended tire pressure is 2.5 bar (front tires: 205/45 R16, rear tires: 215/40 R16).
- Brakes are not sticking.
- The rims are not hot, but they get warm after a longer drive (which is due to the driving style).
-AGR has been deducted.
-The engine runs a bit rough, but that's normal.
- It has approximately 110,000 kilometers on the odometer.
- The car came in with 70,000 km on the odometer, and at nearly 100,000 km, the injectors and LLD (likely referring to a lambda sensor or similar) were replaced.
- The compression exceeds 30 bar.
Since I've mostly driven cars like a Corsa or an A6, I haven't really noticed anything significant so far.

cksIT wrote:

But considering how much work I've put into it, it runs too poorly. ... when I display the measured values, everything is within the normal range. What else could it be due to?

Please refer to the technical article on troubleshooting performance issues. There's much more to check than you've already investigated...

Good morning.


I recently installed new injectors from AFN and increased the boost pressure. I also still have the chip from Princiotta installed.


Regarding your chip tuning, I don't think your 'old' chip tuning will be compatible with the new, larger injectors in the long run. The injection timing (which changes to some extent) and the injection duration in your software are designed for the 1Z injectors. After the injector swap, it should be producing a lot of smoke, but you probably compensated for that with the increased LD (load increase)... Driving like that is too risky for me, and it's probably not good for your engine in the long run.

Best regards, Ralf.

I'm also currently looking for my original EEPROM. I actually wanted to start by experimenting with a 10-cent value, but unfortunately, I can't find the part right now.

Okay, so I found my original EEPROM and installed it yesterday. Now it only smokes noticeably in first gear. The other gears are relatively clean. (Unfortunately, the exhaust is still pointing upwards).
I'll check to see if everything is covered in dirt due to the agricultural land, and if so, I'll clean it.
"I'm now reaching just under 200 km/h with the turbo boosting and around 1.2 bar of boost. With the ASD transmission, I should be able to go faster. The ASV reached 215 km/h and was at over 4200 rpm..."
mine doesn't even come close...
I just bought a used LDA (likely referring to a 3D printer) and I'll see if everything is okay with it.

Did you log the fuel injection amounts in that RPM range at 200 km/h?

To the best of my knowledge, the engine is likely to be limited somewhere above 4000 RPM, possibly exceeding one of the limits. At least, I observed that the boost pressure decreases at that point, based on my experience with the 1Z engine.

Perhaps ASD is too short.

The ASV is also registered with only 195 horsepower, or something like that - at least, that's the case for the Ibiza 6K GP01.

m;

dieselmartin wrote:

Maybe the ASD is too short.

This is probably less: a real speed of 200 km/h with 185/60 R 14 tires corresponds to approximately 4,280 rpm.

However, to achieve a real-world speed of 200 km/h, the G3 likely requires around 122 horsepower (based on the AFN model with a top speed of 193 km/h, if I recall correctly).
Getting a 1Z engine to produce only 122 PS @ 4300 rpm with larger injectors, going from 90 PS, is, in my opinion, already a very good (too good) result .

I'll then do a test run up to the maximum speed.
If I understand correctly, I need two MWB 1 devices: one with a speed function and one with an LD (likely referring to a light detection or similar) function.

What I really don't understand is the difference in acceleration between the ASV and my car. Even with the chip, the injectors, and the increased load, the ASV was still a bit faster. I should have been well over 110 horsepower, though. I do have slightly wider tires, but that shouldn't make *that* much of a difference...
Well, maybe there's just too much oil sludge in mine that I need to remove with the AGR system. That would probably be the easiest solution.

I think that tires are more important than those dubious advertising gimmicks like "Oelschlamm."

The Ibiza owner uses 185/55 R15 tires in the winter and 205/40 R17 tires in the summer.

"The box is noticeably slower with the flip-flops on, and it doesn't accelerate as well," he says. (and he has times from the local hill that confirm this).

m;

I've experimented with it a bit more, but I'm somehow not getting the hang of the dzr.
"When I enter all the data, the result for a tuning with 112 hp is a time of 8.5 seconds. However, when I read through this forum, some people have a time of 8.2 seconds without any tuning, and that's with the 1.4 engine."
I also get a result of 8.2 seconds.
What did I enter incorrectly?
I've added another Screenshot of my calculation.
If I understand correctly, the tire size is used to indicate the different rolling circumference, and this is used to calculate the rolling resistance?
"And 8.2 seconds isn't okay for a 1Z engine with AFN injectors and a lambda value of 1.2 bar, is it?"
Unfortunately, the LDA hasn't arrived yet. If it had, I could confirm whether the LD actually measures 1.2 bar. However, it's barely running now since I put the original chip back in, although the performance is also gone (it was previously 7.1 seconds).

cksIT wrote:

what did I enter incorrectly?

At a minimum, the speed is around 2000 rpm. 1.9 VP-TDIs typically go around 50 km/h.

I'll adjust the speed again later.
I didn't think it would change everything so drastically.
Hopefully, my LDA will arrive soon, then I can finally get back to work...

Okay, I've adjusted the times. Without the chip, my time puts me at 104.1 horsepower. Isn't that a little low?
or is there something wrong with my calculation?

I've received the LDA now, but unfortunately, I don't have the hose.

cksIT wrote:

So, I've now adjusted the times. Without the chip, I'm getting 104.1 hp with my current time. Isn't that a little low?? or is there something wrong with my calculation?

You are responsible for the input data, and therefore for the quality of the result.
The incorrect speed reading at 2000 rpm only caught my attention at first glance.

104 horsepower wouldn't be particularly impressive for a tuned 1Z engine.
However, this can be due to subtle incorrect inputs, measurement errors, poor tuning, engine defects, worn brakes, and so on.

Currently, the chip is still in its original state. Only the injectors and turbocharger are tuned.
I can rule out measurement errors because I took all measurements multiple times and then calculated the average.

cksIT wrote:

Currently, the chip is still the original one. Only the injectors and the LD (likely referring to a specific tuning component) are modified.

Oh, so 104 horsepower is definitely within the usual range according to the DZR (likely a measurement or standard), because the extra power is concentrated in the higher RPM range, meaning the torque curve is altered.
However, the DZR (without any specific input) assumes the normal curve shape, as if the torque were being increased uniformly.