Ablasszischen wie beim Benziner! | Posts 16+

sticki wrote:

I just find it problematic to increase the volume between the turbo and the engine, because that will certainly also affect the turbo's response, as it will have to pump a bit more air before the same boost pressure is built up again... and whether that larger volume really brings a significant improvement needs to be tested first.

Well, once again, this highlights the conflict between showiness (= whistling sound) and practical suitability (= quick build-up of boost when accelerating), which is fundamentally unsolvable .

I find it particularly amusing when people apply widebody kits to cars that are used for normal, everyday driving.
Every day, countless car owners spend a lot of money so that their car consumes more fuel, performs worse, and is more likely to experience aquaplaning sooner than with the original tires.

Okay, I've been experimenting a bit.

First, the LMM (mass airflow sensor) was unscrewed from the air filter housing, and then a stocking was placed over it.
result: audible hissing sound when accelerating, the mentioned blow-off effect is also clearly audible. disadvantage: loss of power. This may be due to the lack of fresh air supply, but not necessarily. In boost mode, it makes a humming noise, which I don't particularly like.

Then, simply unscrew the short section that connects to the air filter housing.
result: the constant hissing is no longer audible, the blow-off effect is much quieter, but the humming noise during operation is louder > definitely not my preference.

I've now reverted back to the original configuration and I'll probably leave it like that .

Hi everyone,
The issue with the tires is complicated.
'I drive my VW Bus Type 2 T3 with tires size 205 on the front and 225-16 on the rear, I drive about 43,000 km per year, and I never want to have to use original tires again.'
The bus no longer exhibits the same tendency to drift in curves, it handles much better, and the difference in fuel consumption with the diesel engine is difficult to measure, especially since the current tires have less rolling resistance and are also noticeably quieter.
I have never experienced aquaplaning with these tires (P6000), but you shouldn't buy cheap tires from East Asia, and the tread pattern on the tire shouldn't be the worst either.

While the manufacturer's recommended tires are often the best compromise, this is only true as long as you drive in a way that aligns with the manufacturer's intended use.

Okay, I recently almost got stuck on a forest road on the Feldberg mountain, which certainly wouldn't have happened with the original tires, but it probably wouldn't have happened with all-wheel drive either!

Best, Alex.

alexmagnum+ wrote:

The bus no longer exhibits excessive body roll in curves, it handles much better, and the difference in fuel consumption with the diesel engine is difficult to measure, especially since the current tires have less rolling resistance and are also noticeably quieter in terms of road noise.

Well, that was just a little off-topic comment... By "normal everyday driving profiles," I meant curves where you haven't reached the point of needing to push, and I'm talking about regular cars (sedans), not vans (where the experience might be different with factory-installed tires), as sedans are the most common type of car.

disadvantage: loss of performance. This can be due to the lack of fresh air supply, but it doesn't necessarily have to be.

That's because the LMM isn't just randomly located where it is.

There are installation requirements for the mass airflow sensor (MAF). Since it measures the airflow in the intake stream, the incoming air must be calmed and free of turbulence. In the worst case, the airflow separates inside the measuring tube exactly where the MAF is located, and it then measures a significantly lower amount of air mass. The air filter housing and the protruding tube are matched to each other. Using things like mushroom-shaped air filters and other modifications can disrupt the MAF sensor's readings, and also (especially in naturally aspirated engines), it can affect the tuning of the intake system.

Mentioned 1000 times, and nobody cares...

CU Gremlin.

Gremlin wrote:

sticki wrote: disadvantage: loss of power. This can be due to the lack of fresh air supply, but not necessarily. There are installation requirements for the LMM (mass airflow sensor). Since it measures the airflow in the side stream, the incoming air must be calmed and free of turbulence. In the worst-case scenario, the airflow in the measuring tube separates exactly where the LMM is located, and it then measures a significantly lower amount of air mass. 1000 times mentioned, but nobody cares...

Okay everyone, let's try the hissing sounds:
Start VAGCOM and log the air mass and quantity limits!

Then maybe we'll finally get some "concrete evidence," instead of Gremlin just (uselessly) typing away.

I took off the mass airflow sensor from the air filter housing the other day, with a lot of enthusiasm. I don't experience any power loss } with it removed.

In terms of sound, there's nothing really new. In a narrow range, the bass rumble is slightly more pronounced when in 'creep' mode, but that's all.

There are no changes when reversing the VTG (Variable Track Gauge) system... it's not any louder or different in sound.

CU Gremlin.

Hello master_328,

If you want to sell something, please do not post it here, but under the 'For Sale' section! We are not a free advertising forum.

'Sorry, no problem...'

Hello!

I don't think it's related to the VTG, because I also hear this hissing sound in my 1Z, although it's very quiet. But when I give it full throttle (in any gear) and suddenly 'release' the accelerator, it hisses, especially around 2000 RPM. However, you can't hear it from the outside.

I can't say for sure if it's because I have a K&N panel filter installed. The 'sport' air filter doesn't really do anything (as has been mentioned many times), and I'll probably revert back to the original one (for the sake of the mass airflow sensor).

Greetings,
Mathias.