differences in the 1Z

hello

"Does anyone know the differences between the 1Z engines in the Audi 80 (182 and 202 Nm)? I mean besides the mass airflow sensor and turbocharger size. For example, can you bring a 182 Nm engine up to the level of a 202 Nm engine? What would be needed for that? Or with the "10-cent tuning," are different ohm values used because the ESP control works differently? Does anyone have experience with this? I'd like to make it a little more powerful."best regards, christian

Hello Christian,

I'm just jotting down here what I found in my repair manual for the models 7/92-94. Unfortunately, I can't guarantee its accuracy.

- Air mass sensor instead of air flow meter + other turbocharger.
-no altimeter or other altimeter
-different fuel injection pump with a potentiometer for throttle position (it is stated here that it is still the VP34, but it may also refer to models with spring-loaded injectors up to 7/92).
- Other solenoid valves for EGR (Exhaust Gas Recirculation) and boost pressure control.
-Water separator for fuel filter (discontinued after 1994).
-External sensor for intake manifold pressure (available in the control unit from model year 1994 onwards).
-->different engine control unit (ECU)

That's all I could find for now. Therefore, upgrading to a later 1Z model probably wouldn't be financially worthwhile. You shouldn't be too strict about the modification dates. Mine was manufactured in July 1994 and is still the older version. I don't know if a '10-cent tuning' method works, but I'm not interested in any kind of tuning anyway. What I can say is: disabling the EGR system, regardless of how it's done, results in noticeably increased fuel consumption (about 1 liter per 100 km), slightly better acceleration at lower RPMs, and a loss of power at higher RPMs – without reaching the top speed.

Best regards,
Michael.

PS: What is your average fuel consumption per 100 km, and what time do you need to travel at 80-120 km/h in 5th gear on a flat road?

Hello,

Quote:

Was ich sagen kann: AGR-Stilllegung, egal auf welche Art, bringt bei mir deutlichen Mehrverbrauch (ca. 1Liter/100km), etwas besseren Anzug im unteren und Leistungsverlust im oberen Drehzahlbereich - kein Erreichen der Endgeschwindigkeit.

Something seems to be wrong... or your control unit is detecting the problem and reacting in a strange way to it.

Best regards, Rainer.

Hello Rainer,

über die beiden von Dir genannten Varianten hab ich auch schon mal nachgedacht. Eine Möglichkeit, der Sache auf den Grund zu gehen wäre, die AGR noch mal ausser Betrieb zu nehmen und eine Messfahrt zu machen bzw. sogar im Steuergerät nach sporadischen Fehlern zu schauen. Da ich aber immer noch mit dem Minimaladapter mit OK arbeite und damit keine Messwertblockverbindung hinbekomme ist nur ein Speicherauslesen drin. Wenn ich nach meiner Dipl.-Arbeit mal wieder ein bisschen Zeit habe werd ich mir den Adapter 2.4 bauen und noch mal einen Anlauf machen. Die Frage ist, ob es überhaupt einen Sinn für das Board hat, da es ja wenig Leute mit dieser 1Z-Variante hier geben dürfte. BeIf there's interest, I can post something else later.

Best regards,
Michael.

hello michael

Thank you for the reply. I haven't been online for a few days, which is why my response is late. I also deactivated my EGR system, but in my case, it hasn't affected fuel consumption or performance. I deactivated the EGR system based on the recommendation of our local BOSCH service center.

greetings christian

Hello Michael!

I'm experiencing the exact same problem. On my 80 Avant TDI from 11/93, I don't know which version is installed.

My acceleration times are 60-100 in 13.8 seconds (4th gear).
80 - 120 4.G 14.7 s
80 - 120, 5th grade, 19.8 seconds.

The top speed is supposed to be 170 km/h, but I can only reach a maximum of 160-165 km/h (taking into account the speedometer error)!

My Audi A3 (Avant) has 205 tires, is very well-equipped, and has a roof rack.

Do those values mean anything to you, or do you perhaps know what the factory specifications for the car are?

Greetings from Austria, Matthias!



P.S.: Yay, my first post!!!!

Hello,

@Christian:

The fact that you're not experiencing any issues with the AGR deactivation, combined with a slight, subjectively perceived loss of performance, confirms my suspicion that something isn't working correctly on my vehicle. The question is: what exactly is it?
'Since I'm currently unable to read any data blocks with my diagnostic adapter, I'm a bit lost when it comes to troubleshooting. I don't have any error codes in the engine control unit. Do you happen to have an adapter? If so, which version is it? Does it work properly for you? I'm currently using the minimal version with optocouplers, and I plan to build the version 2.4 soon.'

@Matthias:

I assume that by 'problem,' you mean the strange reaction when disabling the EGR valve. Which method have you tried? I've tested all three options, and I always get the same result.
I think that if your car doesn't have an automatic transmission, you probably still have the older 1Z version installed.
Thanks for the figures. My results are similar. The registered top speed for my vehicle is 177 km/h. Also, the acceleration times should be a bit shorter – unfortunately, there's no official data from the manufacturer. I plan to investigate this further soon.

Regards,
Michael.

Hello Michael!

I also have the old 1Z in my 80 Avant (11/93, Italian import). I built the adapter using a MAX232 chip, but I can't establish a connection.
Does at least the error memory reading work with your optocoupler setup? Then I'll probably have to try building those versions again as well.
The AGR deactivation didn't have any effect for me.

Regards,
Lucas.

Hello Lucas,

ich habe die Minimalversion mit Optokopplern. Den Fehlerspeicher kann ich auslesen. Ins Steuergerät vom ABS komme ich ohne irgendwelche Voreinstellungen. Ins Motorsteuergerät gelange ich allerdings nur, wenn ich 240 als Start-Baudrate in den Options von VAG-COM einstelle. All der andere Kram (Blk Int, Char Int,...) hat bei mir überhaupt keinen Einfluss. Einzelmesswerte kann ich auch noch aufnehmen aber dazu gibt es ja keine Dokumentation, was die überhaupt bedeuten. Messwertblöcke kann ich aber nicht kontaktieren. Ich vermute mal, das hängt nicht zuletzt mit der geringen Übertragungsgeschwindigkeit zusammen. Bei meinem Vater seinem A4 funktioniert das ganze problemlos - Adapter u. La'It seems that a 'ptop' system (Gericom PII 333, 256MB RAM, Win98) is located in...'Within the next few weeks, I will build the 2.4 GHz adapter as I mentioned. Or can you advise me against it? If this improves anything, I can post an update later.

PS: By the way, are you actually from Reichenbach in the Vogtland region? I myself spend my weekends in Zeulenroda.

Hi!

Okay, I'll try experimenting with the baud rate again. My adapter also works perfectly fine with newer vehicles (like the G4AFN and Passat 1Z), even with a PIII 800MHz processor and Windows 2000.
Correct: Reichenbach (in the Vogtland region), but only every other weekend...

Greetings.
Lucas.

I'm experiencing the same login problem with the MSTG as you are. I've now set up 3 different adapters, and in all of them, I have to set the initial baud rate to 240 in order to log in. The other STGs work with the default settings.
However, I can also read out some additional data blocks, but the most important ones are not included (e.g., 000). I have already sent an inquiry to DRV regarding this, and they responded that I would likely need to purchase the PRO version. Apparently, that's what's required for the logging functionality to work...
Does anyone in this forum have the professional version of DRV so we can take a look inside? Surely it should be possible to replicate that device...

Hello Edward,

Which three adapters did you build? Did version 2.4 include them? Isn't measurement block 000 locked anyway in the shareware version of VAG-COM? Or are you already using the full version? I'm not entirely convinced that buying the professional adapter from DRV will solve the problem. I found a post by 'joergs' where a quote from an employee at 'Auto-Intern' stated the following:

Quote:

1Z Motorsteuergeräten benötigen manchmal eine Baudrate von 240 Baud. Das ist viel langsamer als alle anderen Fahrzeugen. Manchmal klappt es wenn man die Anfangs Baudrate auf 240 stellt. Neuere OBD2-Tester K1-K2 haben auch eine integrierte Baudratenerkennung wie die HEX-COMs von Ross-Tech und beheben dadurch auch dieses Problem. Leider sind manche 1Z Motorsteuergeräte Bj 93-94 die einzigen Steuergeräte, die auf Dauer nicht von VAG-COM unterstützt werden, auch nicht mit geeigneter Hardware.

Best regards,
Michael.