anti-lag

[bxracer69]

Alright guys, I want to get antilag for my car by next year. I know it has to do with engine timing at idle, so lets make it happen. Who can help me out on this one? I've read up on it and I want to be able to turn it on and off, so I can use it when I want. I also dont want it tuned too aggressive as it may destroy my turbo, however with a mild antilag I should not have any problem.

[tysonK]

I believe it has to do wth having an extra turbo at your house for every car trip you make?

oh my.

[Kevin M]

Most stand-alone EMs can do it. It would be very difficult to do with piggybacks or reflashes though. And like Tyson said, it is really harsh on your turbo and exhaust bits.

[sperry]

I don't think there's such a thing as "mild" ALS:

Originally Posted by Wikipedia

Anti-lag, (Sometimes called a Misfiring System in Japan, and a Bang-bang in Europe, due to the popping sounds made when the system is active), is a system used on WRC rally cars to completely eliminate turbo lag. It is a feature of the engine management system. WRC cars are fitted with a class mandated restrictor on the turbocharger inlet and this increases turbo lag significantly. Because of the pressure drop across the restriction, the pressure ratio for a given boost level is much higher and the turbocharger must spin a lot faster to produce the same boost as before.

Anti-lag effectively increases the mass of exhaust fed to the turbocharger. This is typically done by retarding spark timing to a point where most of the combustion happens in the exhaust manifold, typically around 40° ATDC. At the same time more air must be added, this can either be done by the use of a throttle bypass valve or a throttle stop solenoid. When anti-lag is switched on it is typically active when the throttle is closed, and when the throttle is opened the spark timing is resumed to normal.

Exhaust temperatures produced by this system are phenomenal but they can be controlled by varying the amount of fuel injected while anti lag is active; a richer mixture lowers the temperature. Anti-lag is typically only used on race cars because it can shorten the turbocharger service life down to impractical periods for street use. The turbine blade life is drastically reduced, and the entire exhaust system is put into shock, which can lead to explosion or fire. Rally cars generally change turbochargers every chance they get to do so.

http://en.wikipedia.org/wiki/Anti-lag

Either you're buring fuel w/ the exhaust valves open or you're not. I don't remember how much work you've got done to you're car, but if you're not running a built block, massive turbo, standalone EM, and all the other go-fast bits, you've probably got about $10,000 worth of other mods to do before ALS is going to be any real benefit for you.

...hell, I can't even think of any benefit from ALS on a street driven car. Rally cars only use it 'cause they have a tiny restrictor on the intake that severely limits their spool up. If you're running a stock turbo, ALS will maybe gain you 100 or 200 rpm earlier spool... not really worth having to replace turbos every 2 months IMO.

[bxracer69]

point taken