For Math Enthusiasts: Catalog Times 0-100

Hello,

I tried to check the plausibility of the catalog acceleration times for TDIs with each other.

Due to the different torque characteristics of PDs and VP-TDIs, it is not sufficient to only consider the maximum power output. Instead, I calculated a simple engine parameter, the average power between the maximum torque and Pmax. That results in
90 PS 1Z/AHU = 72 PS
90 PS ALH = 73 PS
all 110 hp = 87 hp
130 PS PD = 107 PS
150 PS PD = 118 PS.

If we use these values for calculating the power-to-weight ratio at half load (the standard 0-100 mph test condition for VAG; unladen weight without driver measured), then the acceleration (assuming essentially identical power loss ratios and gear ratios), whether VP or PD engine, should pretty much directly depend on this power-to-weight ratio.

Here "my" performance weights and in parentheses the 0 - 100 catalog times:
Golf 3 90 PS = 19,0 kg/PS (12,8 sec)
Golf 3 110 PS = 15,8 kg/PS (10,8 sec)
Golf 4 90 PS = 20,2 kg/PS (12,4 sec)
Golf 4 110PS = 16,9 kg/PS (10,6 sec)
Golf 4 130 PS PD = 14,1 kg/PS (9,6 sec)
Golf 4 150 PS = 12,9 kg/PS (8,6 sec)
Ibiza ALH 90 PS = 18,1 kg/PS (12,1 sec)
Ibiza ASV 110 PS = 15,6 kg/PS (10,5 sec)
Ibiza 130 PS = 13,4 kg/PS (9,4 sec)
Audi A3 130 PS PD = 13,8 kg/PS (9,2 sec)

Ultimately, the interesting relationship between the above performance weights and the corresponding 0-100 rating, which I would like to define as a "catalog factor" (I couldn't think of anything better ), is what I am referring to.
Example: Golf 3 110 PS: 15.8 kg/PS / 10.8 sec results in a catalog factor of 1.46.

If a "beautified" 0-100 time is specified for a vehicle, the catalog factor will increase accordingly, and vice versa.
Lower catalog factors can also stem from unfavorable gear ratios, such as those found in the Ibiza 130 PS PD, which has a relatively long 3. Only release the Pmax at 111 km/h.

Here are the catalog factors of the aforementioned. Vehicles:
Golf 3 90 PS = 1,49
Golf 3 110 PS = 1,46
Golf 4 90 PS = 1,63
Golf 4 110 PS = 1,60
Golf 4 130 PS PD = 1,46
Golf 4 150 PS PD = 1,50
Ibiza ALH 90 PS = 1,50
Ibiza ASV 110 PS = 1,49
Ibiza 130 PS = 1,43
Audi A3 130 hp PD= 1.50

In fact, one can identify a relatively narrow midfield of 1.46 to 1.50, in which 7 out of the 10 cars are located, with VP and PD TDIs being equally represented. The slightly lower 1.43 for the 130 PS Ibiza typically corresponds to its gearbox.

The Golf 4 with VP engines, with 1.60 and 1.63 (8 and 10% deviations from the average of 1.4 also smells strongly of hot air here, meaning that its 0-100 time is probably approximately 0.9 or 1.2 seconds too short compared to the comparison vehicles.
Or, it was (my guess) measured or calculated with a reduced combat weight, in order not to appear too outdated compared to the previous Golf 3, given the same engine.

Anyone who is interested can check the plausibility of the 0 - 100 acceleration figures for their own or other TDIs based on the catalog data. I would be interested to know if the 4-cylinder Golfs with VP-TDI are the only ones that seem to be "quick-calculation" cars.

The relevant power (with "PD-VP-compensation" calculated according to
(Maximum Nm x rpm / 9549 + Peak Power (kW)) x 0.68.

Half Load = (Empty weight without driver + permissible total weight) / 2.

If I have bored someone: sorry - Ernst has infected me with his calculations

Ernst has infected me with his calculations

Did you start using your calculator

Best regards, Ernst

Hi Ulf,

I also have a long-standing suspicion that the numbers are being manipulated. My G4 90PS is also running noticeably worse than my old G3 90PS.
Was mich aber wirklich interessieren würde, ist, ob die Experten und Fachleute aus Golfsburg regelmäßig in den Foren unterwegs sind und sich auch die Meinungen der interessierten Kunden (also Hobby-Schrauber) ansehen.
Why isn't there actually a forum where the manufacturer or their associates can answer all sorts of questions? That alone would be a reason for me to buy...

Greetings

Eike

eike wrote:

My G4 90PS is also running noticeably worse than my old G3 90PS.

Hi Eike

. . . which shouldn't be the case according to the catalog . . . one should not confuse "running slower" with the apparently software-delayed throttle response of the ALH and Co. generation compared to 1Z and AFN.

Older TDIs apparently react more aggressively and spontaneously to the accelerator, but, for example, in the 2000 - 4000 RPM test, they are not noticeably stronger than the new generation.

Quote:

What I would really be interested in knowing is whether the experts and strategists from Golfsburg regularly browse the forums and also check the opinions of interested customers (= amateur users).

They would be foolish if they didn't it. Only, it is unlikely that anyone will officially admit to engaging with such amateurish talk.

Quote:

Why doesn't there exist a forum where the manufacturer or their associates can answer all sorts of questions?

Because the gentlemen would have to get down from their high horses.
But why, when VW is still being bought in massive numbers, despite all the criticisms? So, there is no urgent need to confront the "consumer."

Older TDIs apparently react more aggressively and spontaneously to the accelerator, but, for example, in the 2000 - 4000 RPM test, they are not noticeably stronger than the new generation.



If the AGR is set or reduced to a minimum through adaptation, the response becomes significantly better.

is the usual question: environment or environment

with AGR, less NOx but more fuel consumption etc. pp.

See you, Gremlin