Leistungseinbruch bei Endgeschwindigkeit nach ***-Chiptuning | Posts 16+

Hello again!

I still need to finalize this forum (almost there), and I'd like to do so now.
I've now installed a new Pierburg mass airflow sensor, and I'm now reaching my top speed. Here come the next questions.
Now my Audi is going 220 km/h according to the speedometer (1.9 TDI, originally 110 hp, but upgraded to 132 hp with an *** chip).
Could it be that no limiter is currently active?
Where exactly will the limit be implemented? 'Through the control unit?'
And how high exactly can it rotate? Or does it achieve higher performance with such a chip?
My old mass airflow sensor no longer had the protective grilles.
And I have the feeling that he managed to do it a little better with that. Could that be possible?

I've already read through the other forums about sports air filters and removing the protective grille on the mass airflow sensor, and I've probably come to the conclusion that I should leave things as they are, because it only results in a very slight reduction in fuel consumption.

Regards,
Carsten.

Hello,

Quote:

I now have a new Pierburg mass airflow sensor installed, and I am now reaching my top speed.

great!

Quote:

Could it be that no limiter is currently active?

No. In normal driving conditions, there's a point where the engine's power is no longer sufficient to overcome air resistance and rolling resistance. The engine's RPM at this power level, and therefore your speed, represents the vehicle's top speed.
Above the rated power speed of your engine, the power simply decreases, and this happens gradually. Speaking: above an engine speed of approximately 4200 RPM, the amount of fuel injected is reduced by the control unit.
If the fuel injection amount is not reduced, the engine speed at full throttle could become so high that it causes valve damage. -> Engine failure.
A proper rev limiter, designed to protect the engine, typically kicks in at around 5000 or 5200 RPM (I don't remember the exact number off the top of my head).

You can easily check this speed (maximum speed) using the tachometer: with the engine at its operating temperature, press the accelerator pedal all the way down while the engine is idling and keep it pressed down.
Don't worry, nothing will break. Every 2 years, the same checks are performed during the vehicle inspection (and during rapid acceleration, the opacity of the exhaust fumes due to soot is also measured).

Best regards, Rainer.

Rainer K. wrote:

You can easily check this speed (maximum speed) using the tachometer: with the engine warmed up, press the accelerator pedal all the way down while the engine is idling and keep it pressed down.

...or check the most recent AU certificate.

Rainer K. wrote:

Is it possible that no limiter is currently active? Quote: No. In normal driving conditions, there's a point where the engine's power is no longer sufficient to overcome air resistance and rolling resistance. The engine's RPM at this power level, and therefore your speed, represents the vehicle's top speed. Above the rated power speed of your engine, the power simply decreases, and this happens gradually. Speak: with increasing engine speed above approximately 4200 rpm, the fuel injection amount is reduced by the control unit. Hi Rainer, Relaxanz wrote something about chip tuning for his car

.
And I suspect that the tuner has simply shifted the power limit slightly upwards.
(Because: It's often difficult to explain to some people that more power doesn't necessarily mean a higher top speed - with which I am here addressing, in general , only the tuning clientele ).

Of course, this doesn't "deactivate" the limiter, but it might create the impression that it's doing something.

How about a 9-pin Sub-D connector in the glove compartment?

Rainer K. wrote:

How about a 9-pin Sub-D connector in the glove compartment?

Wrong thread

Hm, strange, how did this happen now?
I think I should probably go home now; maybe I was looking at the wrong monitor from one of my three computers here...

Hello!

I haven't been able to reach the limiter using the idle measurement method yet.
'But yesterday, while driving on the highway, I noticed that at 220 km/h, I had a...'
had a speed of 4600 revolutions per minute.
That seems pretty fast, especially for a 132 hp TDI, doesn't it?
Okay, I'll test the rev limiter later, if there is one.
And something else I noticed:
From idle to 2000 RPM, the car makes a whining noise (coming from the engine compartment).
Is it likely coming from the engine, or because the turbo kicks in?
Or does he simply not like the cold? I didn't have that until a few days ago.

Regards,
Carsten.

Hello!

Here's one more addition:

I just revved the engine while it was idling, and I got it to go over 5000 RPM. Is that too much for a TDI with a chip?
The red zone starts at just 4600 RPM.
I'm a little scared, which is why I didn't ask them to turn it up any higher.
Therefore, I still don't know if a rev limiter is active.

Thank you for the additional tips.

Regards,
Carsten.

@ Relaxanz:

The normal idle speed is between 4800 and 5200 RPM. Today, mine was 5080 RPM.

Look: /viewtopic.php?t=4440

You can even download the data logging information from there.

Regards,
Alex.