fin lyd

[mrbatnes]

kom over denne videoen på youtube, den viser en e30, trolig 325 med fin turbolyd i står at den har montert "antilag" system. noen som vet hvordan dette funker?

[Remito]

Knall lyd i denne ja

Er vell en E34 det der tror jeg...

[shv]

Musikk!

[TIF]

Står i commentsa nedom videoen at Antilag er:

ALS or anti-lag-system is where your modified fuel system produces a rich fuel mixture when you take the foot off the pedal so that the fuel would travel into the exhaust manifold and ignite there keeping the turbo spinning and boost pressure up.

[Reedline]

bin laden bmw hahahaha!

[MikaelR]

Noen som vet kor man får tak i en sånn dumpventil som va på den første filmen???

[Ivanrogov]

Det er vel ikke noe dump som lager den lyden. Er fra luftfilteret.

[///MoePower]

Den lyden kommer trolig ikke fra noen dumpventil.

Den kommer fordi det ikke er noen dumpventil og luften når han slipper gassen går tilbake til turboen og bremser denne, hvilket skaper "turbulensen" du hører.

Rett meg hvis jeg tar feil, men vet i allefall at slik lyd kan komme av nettopp det jeg sier.

[daywalker-^]

Helt riktig der moepower og som sagt fikk jeg en litt bedre forklaring på engelsk:

First of all, we have to have a quick re-cap on how turbocharging works. Essentially, exhaust gas is used to spin a turbine which compresses intake air. But what happens when you shift gears? You have to lift your foot off the throttle. Exhaust gas velocity drops, and the turbine blades slow down. Intake boost pressure drops. For the next gear, you have to wait until the turbine spins up again for the boost to kick in. This is what you call turbo lag. However, turbo lag should not be confused with boost threshold, which is the minimum engine RPM which is required for the turbine to physically supply boost.

[Ole@Automote]

Sikle sikle hva er det med lyden i motorer

[Cumberdale]

bin laden bmw hahahaha!

Må ha vært den tregeste utkjørslen fra en garasje igjennom tidene.

[911dozer]

Også kalt respons system!

Lett å kjenne igjen den lyden.

[plumbo79]

Så da har man ingen dump ventil?

[plumbo79]

For å slippe turbolag hvorfor kan man ikke stenge av turboen med noen spjeld å la den spinne i sin egen luft, slik som når man holder handen foran en støvsuger så spinner turtallet opp pga mindre motstand og ingen luft fløde?

[911dozer]

Tror nok du må tilføre enegi (bensin i eksosen,retardert tenning) for at det skal være mulig å bygge opp et tilfredstillende trykk.

Respons system eller Anti Lag System (ASL) same,same.

"

When the driver lifts his foot from the gas pedal the ignition timing is altered with sometimes 40° or more of delay (retard) and the intake air and fuel supply mixture is made richer. The inlet butterfly is kept slightly open or an air injector is used to maintain air supply to the engine. This results in air/fuel mixture that keeps getting in the combustion chambers when the driver no longer accelerates. The ignition being delayed, the air/fuel mixture reaches the exhaust tubes mostly unburned. When the spark plug fires, the exhaust valve is starting to open due to the ignition delay mentioned above. Additionally, the exhaust temperature being extremely high, the unburned fuel explodes at the contact of the exhaust tubes. Luckily the turbo sits right there and the explosion keeps it turning (otherwise it would slow down since its intake, the exhaust gases, is cut-off). The effect is vastly lower response times with some downsides:

*

A quick rise of the turbocharger's temperature (which jumps from ~800°C to the 1100°C+ region) whenever the system is activated

*

A huge stress on the exhaust manifold and pipes (mounted on a street car a bang-bang system would destroy the exhaust system within 50-100 km)

*

The turbo produces significant boost even at engine idle speeds

*

The explosions which occur in the exhaust tubes generate important flames which can, sometimes, be seen at the end of the exhaust tube

*

Reduced engine brake

The ALS effect is mostly dependent on the air allowed into the engine, the more air supplied the more the ALS effect will be noticeable. Consequently ALS systems can be more or less aggressive. A mild ALS will maintain a 0 to 0.3 bar pressure in the inlet manifold when activated whereas, when inactive, the pressure in the inlet manifold with the throttle closed would be in the region of -1 bar (absolute vacuum). Racing ALS versions can maintain a pressure of up to 1.5 bar in the inlet manifold with the throttle closed."