Welches Getriebe hat der ARL-Golf 4? | Posts 16+

I could do another test drive at that location at night, but it will be summer because of the winter tires...

Hi,

I also think 4400 is harmless... Don't PD engines also reach up to 5000 rpm in the rev limiter test (AU)?

4400 is definitely within the normal range at ASV, especially when you're approaching the maximum speed - although, of course, it's not a PD (presumably referring to a specific type of vehicle or system).

Best regards,

Jan.

Jan6K wrote:

I also think 4400 is harmless... don't the PDs also reach up to 5000 in the derating test (AU)?

"Definitely at least - I once shifted into first gear and completely revved my engine - and at around 5200 rpm, according to the tachometer (if I recall correctly), it still wanted to go higher."

However, my engine speed (RPM) is running ahead of the actual value, starting around 3500 RPM. At 4000 RPM, it's already about 40 RPM higher than what VAGCOM indicates.
If the advance timing continues to increase beyond 4000, then 5200 RPM on the tachometer would likely result in significantly less power.

Quote:

4400 is definitely normal with the ASV, especially when you're approaching the maximum speed -

Well, with a real value of 193, it should rotate at 4,230 RPM with 185/55 R15 tires (I believe you have the same gear ratios as the AFN Golf, if I recall correctly?).
4400 RPM would translate to almost 201 km/h (125 mph). Should your tachometer also be reading that value?

Hi Ulf,

"The area within which the maximum speed is reached" is quite variable, depending on external factors (mountains, wind, etc.). The speedometer often shows 210 (GPS shows 201), even without a noticeable downhill slope - I suspect that tailwinds and a margin of error contribute to this - and in those cases, the engine speed is very close to 4400 RPM. Therefore, the tachometer should be reasonably accurate.

The speedometer readings of 200 (GPS 192...193) are generally accurate, unless the road is going uphill, which suggests there's some upward variation. Otherwise, with headwinds (which statistically should occur as often as tailwinds, leading to a speedometer reading of 210), the readings should be lower than that.

My 4600 RPM reading at 220 km/h seems consistent with the other values (in terms of linearity), which suggests that the tachometer is providing reasonably accurate readings.

"I'm a bit surprised by the 5200 figure for the PD... Based on the reports so far, I had assumed that the PD would shut down much earlier than the VE. The ASV, according to the last AU protocol from last week, has been hitting a very precise settling speed of 5050 in all the measurements."

Best regards,

Jan.

Quote:

The thing about the 5200 at PD is surprising me, though.

If, in the first gear, the typical high flywheel inertia of the TDI engine doesn't simply pull further upwards, even though the EDC (Electronic Differential Lock) is already engaged.
I've observed the same thing with mine: When you let off the accelerator in first gear with full acceleration and very high RPMs, it briefly revs up a bit higher. However, I've never personally seen the tachometer go above (temporarily) 4,700 RPM.

Roger wrote:

If the TDI-typical high rotational inertia doesn't simply continue to increase "pulling" upwards in the first gear,

That can't be right! The rotational inertia can only maintain the speed. To accelerate, energy input is necessary.

I'm realizing that the 5-speed gearbox in my 2004 AXR Polo (unmodified) has a relatively long gear ratio compared to others.

At the nominal maximum speed (188 km/h), the engine only rotates at 3830 rpm (with 195/55 R15 tires), and at the maximum power output (4000 rpm), the calculated speed is 196 km/h. According to VAG-COM, my tachometer is off by 40 revolutions at 4000 rpm, and the speedometer shows 200 km/h (which means it's overestimating the speed by about 6 km/h with 195/55 R15 tires). Around 4000 rpm (according to the tachometer) is usually reached on a straight road.

According to the VAG-COM data, the highest engine speed was 4430 RPM (A48 - Koblenz towards Trier - the downhill slope just before the Wittlich exit), which corresponds to a calculated speed of 217 km/h (the speedometer only goes up to 220 km/h, and the reading was slightly above that ).

cu,
Curtis.

wolfi_b wrote:

If the Roger wrote: TDI-typical high flywheel inertia doesn't simply "pull" further upwards in the first gear, That can't be right! The rotational inertia can only maintain the speed. To accelerate, an energy input is necessary.

100% authentic.

....Does the gear ratio also depend on the size of the turbocharger being used?
'So, my old Ibiza was quite long, which made it unsuitable for use in a series.'
....the ARL in the Golf or Leon is significantly shorter, translated.........because the larger turbocharger works better at higher RPMs?
'I'm getting a new Leon TDI Topsport in 3 weeks (it's only available in the Netherlands and only with the ASZ engine). I hope it has a longer gear ratio (similar to my Ibiza) than the 150PS Topsport (ARL) because, as a layman, I thought that the smaller turbocharger might not be as effective at engine speeds above 4000 RPM!'
...the Leon only weighs 70KG more... although it's a 4-door model and larger!!
Regards,
Monchi

HI,

How does that relate to the size of the charger?

Even the "small" turbocharger has no problem forcing the required amount of air into the engine at over 4000 RPM; the lower power output is related to the engine's design and, above all, its performance characteristics. For the design of the air-to-water cooling system, what you call the "small" turbocharger is perfectly adequate.

I believe these different grades are more of a marketing tactic, in the sense that they are the most effective way to create distinctions between the models. The ARL will then be considered "better" than the ASZ because it has a shorter wheelbase, which allows it to accelerate better at the same speed and with the same gear ratio.

Furthermore, the maximum speed on a flat surface might be higher if the gearing is designed such that the maximum power output is achieved at the maximum speed.

Best regards,

Jan.

MONCHI wrote:

...the Leon only weighs 70KG more...even though it's a 4-door model and larger!!

However, this still reduces the power-to-weight ratio by about 5%, which increases the 0-100 km/h (0-60 mph) time by approximately 0.5 seconds (assuming the same transmission).
-> I wouldn't have expected it from you , that you would voluntarily do something like that .

To compensate for that, you would have to have the Leon-ASZ tuned to at least 8 horsepower more than the Ibiza - and then the remaining lifespan becomes even more of a concern.

By the way, just to mention something else:

For the Golf IV ARL, the officially available engine codes were ERF and EFF.
However, because of the engine swap from AJM to ARL, I still had the DRW installed, and it was also registered as such.

'230 km/h at 4100 RPM sounds about right...'

http://www.termpro.com/dbdrag/memberalbum/41671b6.jpg

Hey, I just saw that picture today on the A7 highway...
Is that also an ASZ?

'Because today, I was driving at approximately 4100 rpm and my speedometer showed 230 km/h.'

btw, the tires are on, and they are approved for use at speeds up to 230 km/h in winter conditions.

ASZ ERF, unfortunately the same, but blurry, as it was taken from the back seat with a camcorder...
Even though it might be more suitable for the "Good Driving" forum... oh well.