Boost Pressure Increase: Caution!

Hello everyone!

Today, I finally had some time to test the boost pressure increase using a 100 Ohm resistor in the voltage input, as described in the post from October 15th. To start, I have a permanently installed analog boost pressure gauge in the vehicle. The gauge readings are 100% accurate when compared to a calibrated digital measuring device. Normally, the boost pressure is between 1 and 1.1 bar without the resistor. It overshoots to a maximum of 1.5 bar when shifting quickly or accelerating, but then settles back down to 1-1.1 bar after about 2 seconds.
With a 90 Ohm resistor, the boost pressure increases to 1.35 bar, but it overshoots to almost 2 bar. It takes a very long time to fine-tune it to 1.35 bar, so I often prefer to use less boost.
At 69 ohms, the pressure regulation behavior is similar to that at 90 ohms, with a range of 1.25 - 1.3 bar.
At 33 ohms, the pressure regulation is somewhat faster, sometimes reaching up to 1.8 bar. The settling time to 1.2 bar can be over 6-8 seconds, especially when quickly reducing pressure and then increasing gas flow.
At 22 ohms and 1.15 bar, the control response is slightly slower than normal, reaching a maximum of 1.6 bar, but it takes approximately 3-4 seconds to reach 1.15 bar.

So, with a resistance of 100-400 Ohms, the control behavior is probably not very good for the turbocharger! or?

Hatte zwar auch einige Rauch probleme ab ca.200km/h mit meiner Black box (Speed Buster zu und abschaltbar gemacht)aber Auf Jumper minimum alles im Grünen Bereich und laut Prüfstand 189PS 405Nm. DThat's probably enough.

Okay, these are the measurements taken in practice using a physical gauge. Not just short measurements with maximum values using VCDS (formerly VAG-COM).

Best regards, Schulle.

Hello Schulle,

Thank you for your efforts!
We'll probably have to do a bit more research, although I have reservations that a simple solution might be found here.
Perhaps some adjustments to the VTG (Variable Track Gauge) system still need to be made!
Apart from that, I got my BlachBoxx back today. An improvement in soot formation is noticeable at 24 ohms, but further improvement wasn't achieved even with 68 ohms!

Best regards, Achim.

Hello Schulle,

Are you sure everything is okay with your engine?
Especially the turbocharger boost control valve?
I just completed a test drive of about 20km and recorded the values from the boost pressure sensor. I installed a 24-ohm resistor to increase the boost pressure, and I only achieved a boost pressure peak of 1.45 bar for about 1 second.
Two additional pressure peaks were briefly recorded at 1.3 bar.
The normal or average boost pressure is between 1.1 and 1.2 bar.
For the actual value, the 0.03 bar increase in boost pressure must be added.

Best regards, Achim.

Hello Achim!

I believe everything is fine with my setup. Without any resistance, the control behavior, according to the analog measuring device, is very fast, taking less than a second to reach the peak values during adjustment. With a 22-ohm resistor, it's a bit slower, taking about 2 to a maximum of 3 seconds, and in very unfavorable cases, up to 1.6 bar.
Not when accelerating from 1st to 2nd and 3rd gear by quickly releasing the clutch and immediately giving full throttle, but rather as described, specifically when shifting from 3rd to 4th.
When shifting from 5th to 6th gear, and if you shift normally while giving full throttle (with a brief pause of about 1 second), there are almost no spikes.
But perhaps the needles will respond faster with an analog measuring device.
visible directly on the sensor. Or the peaks are displayed as being slightly slower due to the length and small cross-section of the rubber pressure measurement hose (what a word ). In any case, I believe that my residual soot has become even less noticeable at full throttle and during acceleration. According to the rearview mirror, there's nothing more to see.
(with 22 ohms). I need to let my wife follow behind and take a look.
Unfortunately, the Golf2 with only 75 horsepower is not very good on the highway.
What kind of car do you have?

Best regards, Schulle.

Sorry, Achim.

The sentence should read: from the 4th to the 5th , but especially from the 5th to the 6th gear }.

Hello,
If I have time, I'll try it again with a 90-ohm resistor! I think that will allow us to compare the results much more effectively.
My device is the CM20 from Carmetric - www.carmetric.com.
Have you ever heard of boxing, whether in a positive or negative way?

Best regards,
Achim

Sorry.
The email address is www.car-metric.com.

Achim.

Hello Achim,

I haven't heard anything about your box!

Can it also be registered? (Does it have a TÜV approval certificate and so on?)
Let me know what happens when you try it with 90 ohms.
Have fun!

School.