TDI Engine Comparison: Which is Best?

Hello!

Here is a performance chart showing the different Golf 4 TDI models, each in its highest gear.

And here's the 3rd gear: You can now see these images on the left as an Excel table under 'Download Driving Performance Chart.' You can also display data for other gears there. Alternatively, you can also enter torque curves for other vehicles yourself.

Best regards,
Ernst.

Hi Ernst,

That's exactly how the torque curves could be represented. It's quite funny... I've never seen it presented like 'that' before.
The 110-horsepower engine performs very well, even though it's no longer available in the Golf.
The 150-horsepower TDI, on the other hand, looks very disappointing when compared directly to the 130-horsepower version.

Best regards,

Adrian.

That's exactly how the torque curves could have been represented. It's quite funny... I've never seen it presented like '' before.

Hi!

Okay, I probably should have added that these are essentially the torque curves.
It's just that this is what actually makes contact with the tire and what you can really feel.
And all the other factors that are important for real-world performance are also included.

You could represent the performance characteristics of the Passats you're comparing in a similar way. Perhaps RAINER wants to put this Excel table online. You just need to specify the torque curve, the weight, and the desired speed, and you'll get this performance curve.
Best regards, Ernst.

Hi Ernst,

Great visuals!!

The 150 model is somewhat disappointing compared to the 130 model.
The 115 horsepower engine surprises me a bit. I wouldn't have expected that, because based on the specifications, the engine seemed a bit slower.

But what is more important to me is that the 100 hp PD engine is slightly superior to the 110 hp VP engine (at least in the lower RPM range).
What's also noticeable here is that the 100 hp engine seems to be "electronically limited." It exhibits a significant drop in power in both curves, suggesting that the maximum power (or torque) is being restricted by the electronics.
The engine feels the same way. After shifting, it feels constricted, and the power is gradually restored.

Hi!

Where did you get that from?

Best regards,
Uwe

Hi!

I'll send it to Rainer by email right away; I hope he posts it online.

Then I can start debugging... I hope I've already eliminated most of the errors.
It actually works quite well.
You can't exceed the maximum speed... which tells me that all the safety features are working correctly.
Of course, there may be slight inaccuracies in the torque curves.

If there are any other errors in the text (yes, I wrote it myself), please let me know!

Best regards,
Ernst.

Could the area under this curve, which represents the relationship between acceleration and speed, also be used to assess the quality of the engines?
best regards, j.

acceleration over speed, could one also extract some information from the areas under this curve to assess the quality of the engines???
greetings j.


Welche Wörter hast du nochmal verwendet?... Turnip and speedometer.

Okay, so acceleration is what pulls your brain back.
You've placed them here, above the speed. (In road traffic, this is usually the most important thing, not just because of speed cameras.)
Since we're already at high speeds here, you can still keep the turnip upright. Although 7 km/h is already noticeable and pushes you into the seat.

However, in the first gear, acceleration rates exceed 20 km/h per second.
That puts your turnip at considerable risk. It's a shame that with front-wheel drive alone, you can't achieve more than a maximum speed of 18 km/h. At that speed, the wheels start to spin. You could perhaps call this 'turnip protection.' }
Best regards, Ernst.

I believe that performance specifications are so widely publicized in the automotive industry because of the historical development of passenger cars, where the primary focus for a long time was achieving the highest possible top speed, and performance was crucial for that. Until recently, only professional users (farmers, etc.) and dedicated diesel enthusiasts were familiar with torque.
The momentary fun of lightly pressing down on it, that's what it is.
best regards, jörg

http://home.arcor.de/mrjudge/shelby.htm
No TDI, but the V10 is coming.
greetings j.[/img]

Welche Wörter hast du nochmal verwendet?... Turnip and speedometer.

Okay, so acceleration is what pulls your brain back.
You've placed them here, above the speed. (In road traffic, this is usually the most important thing, not just because of speed cameras.)
Since we're already at high speeds here, you can still keep the turnip upright. Although 7 km/h is already noticeable and pushes you into the seat.

However, in the first gear, acceleration rates exceed 20 km/h per second.
That puts your turnip at considerable risk. It's a shame that with front-wheel drive alone, you can't achieve more than a maximum speed of 18 km/h. At that speed, the wheels start to spin. You could perhaps call this 'turnip protection.'
Best regards, Ernst:D

Hi Ernst,

How does one arrive at the 18 km/h/s figure for front-wheel drive? What is a realistic value for rear-wheel drive? And just for fun: What does the Quattro achieve? }
Is there perhaps a formula that can be used to estimate this?

Best regards,

Adrian.

What percentage of slip between the tires and the road would you recommend? I've heard something about around 20%.
best regards, j.

How does one arrive at the 18 km/h/s figure for front-wheel drive? What is a realistic value for rear-wheel drive? And just for fun: What does the Quattro achieve?
Is there perhaps a formula that can be used to estimate this?


Hi!

With a coefficient of friction of 1, it is possible to generate as much driving force as there is gravitational force available.

Since gravity is caused by the Earth's acceleration, which is approximately 36 km/h/s (or 9.81 m/s/s), it is theoretically possible to achieve a speed of 36 km/h/s on the ground if you have all-wheel drive.

When accelerating, the weight shifts towards the rear (which can be noticed when the front of the vehicle lifts).
Therefore, rear-wheel drive can achieve approximately 25 km/h per second (but for this to happen, the weight must shift so that 70% of it is on the rear axle).

With front-wheel drive, the problem is that the weight cannot be prevented from shifting to the rear axle. Therefore, I can only achieve 18 km/h per second if 50% of the weight remains on the front axle. A vehicle with a normal center of gravity probably won't even reach 15 km/h per second.

Braking distances from 0 to 100 km/h: approximately 2.5 seconds for all-wheel drive or rear-wheel drive vehicles with extreme weight transfer (motorcycles).
3.6 seconds for a standard rear-wheel drive.
5.5 seconds is probably a very optimistic time for a front-wheel-drive car.

Now, regarding the tires: They can already achieve a friction coefficient of over 1. A modern road tire achieves approximately 1.05 with about 10% slip (earlier, as Jürgen mentioned, it was 20% slip).

Special racing tires or motorcycle tires offer even more performance. Additionally, with a spoiler, the aforementioned 0-100 km/h times can be improved by a few tenths of a second, or the acceleration can be increased by a few km/h/s.

Best regards, Ernst.

Hi,

I would be interested to see what this graph looks like for an AFN engine that has been upgraded to approximately 140 horsepower and around 300 Nm of torque.

Best regards,
René K.

I'd be interested to see what this graph looks like for an AFN engine that has been upgraded to around 140 horsepower and approximately 300 Nm of torque.


Hi!

I already created this for a friend. He has a Golf 3 AFN with a chip tuning upgrade, bringing the power up to 145 hp / 305 Nm of torque.

Anyone can now create their own visualization using the Excel table available for download here (on the left).

So, I advised him to never give up that Golf with the 3-cylinder engine. Due to its lower weight (1200 kg instead of 1343 kg), it even outperforms the standard G4 with its 150 hp in terms of driving performance.
The advantages of the 150 model: it decelerates more smoothly (noticeable from 165 km/h).
And it reaches a top speed of 216 km/h. The AFN would also need a 6th gear.
Best regards, Ernst.

Wow, that was super fast. Thank you very much, Ernst.