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Posted 30 June 2005 - 01:54 PM
The car has an AEM in it...and its setup to do Anti-Lag with launch control....along with flat shifting.
Anti-Lag is THE fun.
I am DEFINALTY building a turbo and exhaust system to handle antilag.
Posted 30 June 2005 - 03:19 PM
Posted 30 June 2005 - 04:01 PM
When you let off the gas normally...you have no more exhaust flow, so you effectively loose boost, and the turbo impeller slows down.
The idea of anti-lag is to keep the turbo spinning, and the boost will never fall off.
So...to do this you need exhaust flow. What most anti-lag systems do is when you let off the gas, they retard the ignition timing something like 40-50 degrees, so the spark happens while the exhaust valve is open. The piston then pushes this "flame front" into the exhaust, which hits the Turbo and keeps the turbine at full speed (actually more than full speed). Just retarding the spark is not enough however, you also need ALOT of fuel in a effort to try and keep this flame as cool as possible...so it is a super rich fuel mixture which is injected...you also need air...Some people will simply set their idle to 2,000-3,000 rpm so that the throttle plate is always cracked, however most systems use a dash pot which cracks open the throttle plate.
All systems have a different method of activation...some you need to rev above 3,000 rpm for like 5 seconds, then it'll engage the anti-lag. some just have a switch....all depends on the computer.
Anti-lag was not always done like this....early WRC and GroupA cars used things like an EGR valve to keep the turbo spinning, and some even used a propane injector.
Long and the short of it....Turbos do not last very long with Anti-lag, as they don't like the heat much. Exhaust pipes, especially the headers are basically disposable....you either build something that is 100% bulletproof, or just replace the headers all the time...your choice.
When Anti-lag works. you will basically always have maximum boost. So the instant you step back on the throttle you have "x" amount of boost...which is awesome.
personally....i like my anti-lag system...It's called Left Foot Braking, and NEVER LIFTING OFF!
Posted 30 June 2005 - 04:28 PM
Posted 30 June 2005 - 05:52 PM
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