for calculation

Hello everyone,

I have now entered all the data for a performance assessment based on the Excel table.



-1Z, 1285 kg (according to the manifest), driver 80 kg, 35 kg of diesel on board.
-3rd gear, i=1.308, which is a gear ratio compatible with ASD transmissions (compared to 1.360 for CTN transmissions).
- Achsübersetzung for ASD (and CTN 3.6): 3.6
-205/50-15
-171 km/h (indicated speed) (approximately 191 km/h after tuning).


I'm having trouble with the calculation, and I would appreciate it if someone could help me with it.

Thank you in advance.

Best,
Tim

tim27 wrote:

-1Z, 1285 KG (according to the label), driver 80kg, 35kg of diesel on board. -3rd gear, i=1.308, which is a gear ratio compatible with ASD transmissions (compared to 1.360 for CTN transmissions). - Achsübersetzung for ASD (and CTN 3.6): 3.6 -205/50-15 -171 km/h according to the speedometer (after tuning, approximately ~191)

Hi Tim,

With a 1.308 gear ratio for the 3rd gear and a weight of 1,400 kg, the 1Z untuned should take approximately 7.54 seconds to accelerate from 2000 to 4000 RPM. Assuming the tire rolling circumference is within the standard (1.79 m), the road surface is level, and there is no wind.

The indication of speeds is probably not useful here, because the 171, according to the document, are likely actual km/h, and the 191 are probably determined by the speedometer, with an unknown error.
Or do you know exactly how many km/h the car is traveling when the speedometer shows 191 real ?

Hi,
'Those ~7.59 seconds definitely don't seem right.'


'because yesterday we measured my brother's A4 (with a tune) at ~8 seconds, and that one isn't set up for low power either (according to reports, it has ~115 horsepower).'

'If the car reaches 216 km/h on the test bench at 4880 RPM, then it cannot have an ASD transmission, because with an ASD transmission, the car should have a maximum speed of around 199 km/h (CTN less). If I calculate using CYP, the speed comes out to be approximately 217-226 km/h.' If I also take into account the tolerances of the testing equipment, I will probably stick with ASD.

I can reach 216 (according to the test stand) if I let the car coast downhill on the A3 and the engine reaches its rev limiter, which is approximately 220 km/h (according to the speedometer) at around 4900 RPM.

The 7.59-second time is something I can no longer achieve in stock condition.
When typing on a keyboard, I estimate my speed to be around 10 seconds per word.

tim27 wrote:

With those ~7.59 seconds, it just can't be right... The 7.59-second time is something I can no longer achieve in stock condition. When typing on a keyboard, I estimate it takes around ~10 seconds.

With the data you provided, the ventilation calculator doesn't produce any other results. The matter hinges on the translation ratios or the actual speed at 2000 rpm.

If you're willing to put in the effort: turn the engine to Top Dead Center (TDC), then insert the number 3 spark plug. Engage the gear, push the car forward at least 4 engine revolutions (until it's precisely aligned with Top Dead Center again), and measure the distance traveled with an accuracy of 1 cm.
This allows you to obtain a fairly precise value, including the actual rolling circumference, which can then be converted to km/h at 2000 rpm.

Here's a small tip: the CTN transmission in the Golf 3 has an axle ratio of 3.158. 3.6 is the reverse gear ratio.
"If I enter the values for the golf CTN (3. " With a gear ratio of 1.360, the stock motor achieves a time of approximately 9.36 seconds for a vehicle weighing 1400 kg.
To improve the time to 6.8 seconds, approximately 32% more power is needed, which translates to about 118 horsepower / 267 Nm of torque.