2.5 TDI R5 vs. V6 Turbocharger Comparison

Hello,

Perhaps someone can enlighten me about that.

The A4 8E with a 120kW 2.5 V6 TDI engine (BDG) is equipped with a Garrett GT2052V turbocharger, with a part number such as 059 145 701 S.
This engine consumes 40mg of fuel per cycle at its rated power output, with a boost pressure of 2230 mbar absolute.

In comparison, the T4 with the 111kW 2.5 R5 TDI (AXG) engine is equipped with a Garrett GT2252V turbocharger, with a part number such as 074 145 703 E.
This engine consumes 43mg of fuel per cycle (per cylinder) at its rated power output, with a boost pressure of 2050 mbar absolute.

Okay, here's the translation:

"Now my question: why does an engine with more power, and therefore logically higher boost pressure, use a turbocharger with a smaller exhaust side?"

Assuming the intake air temperature is the same, the GT2052V should theoretically spin faster to achieve the higher boost pressure.

With the same boost pressure but a smaller exhaust side, a larger exhaust enthalpy difference is required to achieve the same boost pressure .

EDIT: It should be mentioned that in both cases, the engines are Euro3 compliant.

However, not all compressor models are the same. The GT2052V has a larger inducer diameter than the GT2252V, which somewhat contradicts its designation. Therefore, at the same rotational speed, the GT2052V achieves a higher maximum performance. Funding volume possible.

Hi,

A turbocharger with a smaller turbine wheel can be controlled more dynamically, while changes in boost pressure with a larger turbine wheel occur more "stiffly." Additionally, the weight and, consequently, the rotational inertia of a turbine shaft will be lower with a smaller turbine wheel. That also fits better with a passenger car.

I suspect that with vans, people tend to drive much closer to the soot limit than with passenger cars, which is why the boost pressure is kept lower. We should compare the actual air mass values at rated power.

Best regards, Rainer.

Quote:

The GT2052V, which actually contradicts the naming convention, has a larger inducer than the GT2252V. Therefore, at the same speed, it produces more maximum

. Possible funding volume:

Okay, that's obviously an aspect that I didn't consider due to a lack of knowledge

Quote:

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I suspect that with a van, you simply drive much closer to the soot limit than with a passenger car, which is why the boost pressure is kept lower. We should compare the actual air mass values at rated power.


That would mean that the van loader operates with significantly more reserve power than the car loader.

I can only find datasheets and characteristic curves for the Garrett chargers without VTG. Does anyone know if the internal components are still the same or comparable? In my opinion, such a diagram is much more informative.

http://turbochargerspecs.blogspot.co.at/2011/02/garrett-gt22-gt2252-60-trim-260-hp.html

https://www.turbobygarrett.com/turbobygarrett/turbochargers/gt2052

EDIT: When I compare the diagrams, it's clear that the transporter loader is actually operating far away from its nominal operating point. It seems that a deliberately oversized charger was chosen to operate it within the range of its maximum efficiency .

Okay, so you can completely forget about the diagram for the GT22. The GT2252V from the T4 only has an inducer of 36.8mm, which definitely doesn't match the wastegate version at all.
The GT2052V from V6, on the other hand, has a diameter of 38.6mm, which is a better fit.

"To my understanding, the GT22 was deliberately designed in the T4 to achieve a slightly higher pressure ratio in the lower and mid-range, simply because the V6 engine needs it more than the 2V engine (2 valves vs. 4 valves)."
Of course, reserves also play a role, as NFZ vehicles are optimized for a few kilometers more than passenger cars.

Hi,

I want to revive this thread.

"Does anyone happen to have a proper compressor map for the GT2052V turbocharger?" Online, you can only find the wastegate versions for extreme tuning or for various cheap Chinese products .