whats antilag?
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It's anti turbo lag. All turbo cars suffer from lag (the time it takes for the turbo to get the exhaust gas from the engine). The bigger the turbo the more lag. You can get anti turbo lag by buying a smaller turbo so it will take less time to spool up (but you will suffer in top end revs). Or alternatively you can fit a smaller turbo and a larger turbo together so you get the best of both worlds. Superchargers are antilag because they don't rely on the exhaust gas. On a downside they sap power from the engine.
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A typical antilag system works when the throttle is closed, which is what happens when you take your foot off the accelerator pedal. An antilag system introduces some unburnt petrol into the exhaust manifold. The heat of the manifold causes the unburnt petrol to combust, and the exhaust gas produced by this combustion keeps the turbine spinning, preventing the blades from slowing down - effectively reducing or eliminating turbo lag.
There are two ways to go about this. An aftermarket anti-lag system like those that come with aftermarket ECUs like MoTeC and Simtek will adjust ignition timing during closed throttle situations to a point where the exhaust stream becomes really rich with unburnt petrol. This is done by retarding the timing to about 40 degrees after top dead center. Top dead center is the point where the piston is furthest from the crankshaft. Rally cars use a different way of introducing petrol into the exhaust manifold. There are separate injectors that introduce fuel directly into the exhaust manifold. Some of this mixture will continue burning in the turbine and down the exhaust system, resulting in the flames and explosions you hear coming out of the exhaust muffler as heard in the above clip.The use of anti-lag greatly reduces the life of a turbocharger and engine because of the extreme heat from the combustion in the exhaust manifolds. This is why it is normally only used in races and rallies and not designed for normal road use.
There are two ways to go about this. An aftermarket anti-lag system like those that come with aftermarket ECUs like MoTeC and Simtek will adjust ignition timing during closed throttle situations to a point where the exhaust stream becomes really rich with unburnt petrol. This is done by retarding the timing to about 40 degrees after top dead center. Top dead center is the point where the piston is furthest from the crankshaft. Rally cars use a different way of introducing petrol into the exhaust manifold. There are separate injectors that introduce fuel directly into the exhaust manifold. Some of this mixture will continue burning in the turbine and down the exhaust system, resulting in the flames and explosions you hear coming out of the exhaust muffler as heard in the above clip.The use of anti-lag greatly reduces the life of a turbocharger and engine because of the extreme heat from the combustion in the exhaust manifolds. This is why it is normally only used in races and rallies and not designed for normal road use.
Last edited by bluerigster; 22 April 2008 at 12:40 AM.
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