ALS set up audi RS4 (VID) - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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Member

Registered: 20th May 02
Location: Kent
User status: Offline

2nd Apr 06 at 10:28

ANTI LAG, useful an sounds so

http://video.google.com/videoplay?docid=1691406199316726989

Stoneyginger

Premium Member

Registered: 25th Jan 01
Location: Stonehaven, Aberdeenshire
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2nd Apr 06 at 10:30

ive had that video clip since ages ago

Member

Registered: 20th May 02
Location: Kent
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2nd Apr 06 at 10:31

i was not to know this

Gavin

Premium Member

Registered: 3rd Apr 02
Location: West Midlands
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2nd Apr 06 at 10:31

pew pew pew pewwwww

LAMM13

Member

Registered: 15th Dec 05
Location: Towcester, uk
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2nd Apr 06 at 10:35

WOW

mav

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Registered: 19th Jun 01
Location: Scotland
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2nd Apr 06 at 10:43

mazin

Mertin

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Registered: 12th Oct 05
Location: Scotland
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2nd Apr 06 at 11:01

whats anti lag anyway?

Member

Registered: 20th May 02
Location: Kent
User status: Offline

2nd Apr 06 at 11:03

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

Cybermonkey

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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline

2nd Apr 06 at 11:06

quote:
Originally posted by jr
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

yeah like trying to keep it road legal

Mertin

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Registered: 12th Oct 05
Location: Scotland
User status: Offline

2nd Apr 06 at 11:07

i see, some say it fucks the turbo?

Member

Registered: 20th May 02
Location: Kent
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2nd Apr 06 at 11:07

what

Cybermonkey

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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline

2nd Apr 06 at 11:10

Member

Registered: 20th May 02
Location: Kent
User status: Offline

2nd Apr 06 at 11:11

quote:
Originally posted by Cybermonkey

i wasnt sure what you meant by "yeah like trying to keep it road legal"

Cybermonkey

Member

Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline

2nd Apr 06 at 11:16

quote:
Originally posted by jr

quote:
Originally posted by Cybermonkey

i wasnt sure what you meant by "yeah like trying to keep it road legal"

...with some downsides...

Member

Registered: 20th May 02
Location: Kent
User status: Offline

2nd Apr 06 at 11:16

ah i see

Cybermonkey

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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline

2nd Apr 06 at 11:18

i think it needs some Hamstertech-nology to keep it real fosho

Corsa Sport Gav

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Registered: 12th Feb 03
Location: Durham, County Durham Drives: A6 Allroad
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2nd Apr 06 at 11:26

ive drove one of them there are truly amazing

jammo20

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Registered: 17th Nov 03
Location: in your mum
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2nd Apr 06 at 12:49

sounds fuckin bad

Sly_SRi

Premium Member

Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
User status: Offline

2nd Apr 06 at 15:19

he seems to miss 2nd gear

Corsa C Z20Let

Black Sleeper Turbo Project

Chris F

Show Staff
Organiser: East Anglia
Premium Member

Registered: 26th Dec 05
Location: Newmarket Drives: Escort Van 1.8
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2nd Apr 06 at 15:23

yer what does he do half way through where the car makes a weird sound!
???

Sly_SRi

Premium Member

Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
User status: Offline

2nd Apr 06 at 15:50

bouncing off the rev limiter by the sounds of it

Corsa C Z20Let

Black Sleeper Turbo Project

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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2nd Apr 06 at 15:53

agreed Sly, sounds like he misses a gear and hits the limiter

sounds awesome

SVM 286

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Registered: 13th Feb 05
Location: pain
User status: Offline

3rd Apr 06 at 17:41

quote:
Originally posted by jr
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

Jimbo you sausage

Rather than cutting and pasting a badly translated page which will no doubt confuse the poor chap even more, why didn't you just explain what anti-lag does?

The basic principle of an ALS is to keep the car's turbo/s spinning under closed throttle conditions.

The technology was born out of rallying force induced cars, and is used to maintain power in a linear fashion similar to that of an aspirated engine, so as to keep momentum through bends and between gear changes in order to prevent the car from becoming unsettled, and to improve stage times.

To my knowledge, there are two ways of producing the effect.

They are quite complicated but I will try to simplify.

As far as I know, WRC cars have an additional ECU that controls a fuel supply to the turbo itself, the resultant combustion in the turbo keeps it spinning when the throttle is closed.

There are also aftermarket systems fitted to some road cars that implement a form of ALS by retarding the ignition under closed throttle conditions, to such an extent (as much as 30 degrees) that the fuel/air mixture in the combustion chambers is actually ignited with the exhaust valves still open.

A throttle by-pass valve that is controlled by a throttle postion sensor allows air into the engine simultaneously, and the resultant combustion in the exhaust manifold supplies the turbo/s with enough pressure to keep it/them spinning.

Hope that made some sense.

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Corsa Sport » Message Board » General Chat » ALS set up audi RS4 (VID)

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