7 replies to this topic

[WJM]

So we finally got Templar's WRX up and running...after much delay on transmission parts and some issues with electrical system grounding and all that good stuff....

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.

[samo]

Awesome dude!

Antilag + Launch Control is so much fun!

[MSSLGECKO]

If you feel like explaining it to me, I would like to know what anti-lag is. Seems like it might reduce the amt. of lag

[calebz]

And how is this old gen related?

Moved

[Do It Sidewayz]

alright...heres what basically happens.


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!

[subarubrat]

Also, on some implementations it sounds like a semi auto 12 guage going off.

[eddygordouk]

oooo is this also called the "mis-firing system"? I saw a video of a Pulsar GTI-R with it and lordy, it speed off from dead stop literally like a rocket car. SR20DET 245hp stock hatchback awd, a true subaru rival (im sure people know that era as with the Mazda 323 gtx which are way hard to find in my part of town) Thats really the other car id want other than subarus haha. Id love to have ani-lag on a STI but we all can dream

[WoodsWagon]

How do the exhaust valves hold up to that?