two step program question

[toomey200]

I heard something about two step that it messes up your oil to your turbo or something like that...? Not sure. Can anyone clarify this for me or tell me if there is any down falls of a two step? thanks

 

[sheldon]

It doesnt do anything to the oil to the turbo..If your bov is vented and you get on the 2 step and get off then try to get right back on it will run rich as hell...Oh and if you try and pop the clutch with a stock tranny and transfer case...it won't last.

 

[GVR4592]

I think you are referring to anti-lag. There are many different types of anti-lag but on our cars the common theme is to play with ignition timing while on the 2 step(launch limiter). By retarding ignition timing to a very late point in the combustion cycle, the explosion of fuel and air is occuring while the exhaust valve is opening. This sends a lot of heat through the turbo, effectively spooling it while the car isn't moving. The advantage to this is building boost on the line when drag racing. You can get a much better launch with anti-lag.

There is a negative side, all of that heat has to go somewhere and the turbocharger is where the action is taking place. Anti-lag can and will shorten the life of your turbo, the oil is what keeps the turbo alive, if it gets too hot it can't do it's job. I've heard of people melting turbine wheels and housings when using rally-type antilag systems, but nothing like that on a drag-style antilag.

 

[donmagicjuan]

Luke,

To satisfy my curiosity, could you expound upon what sets a rally-type system apart from a drag-type one?

EDIT: It seems my question was a bit premature. I just went off a-googling and found the answer in a matter of seconds. Rally cars use a separate injection system to inject unburnt fuel directly into the exhaust manifold between shifts. Oh well, that'll learn me.

 

[GVR4592]

I really don't know that much about rally-style antilag, just what I've read on the various forums over the years and seen in the software for standalone systems. So I'll do my best to explain what I do know. I think a Google search would probably yield better results than my post will.

It's pretty basic in concept, but not so basic to make it work right. Basically when the throttle closed, ignition timing is retarded significantly, and air is introduced into the exhaust manifold. If you've ever seen an Evo 8 exhaust manifold and wondered what those two cast in bosses are for, now you know. Those bosses are tapped for air lines on the JDM/Euro Evo's, I don't know if it's completely functional, but most of the components are there and so is the code in the factory ecu.

Of course there are many ways to implement this, some systems keep the throttle cracked open slightly instead of injecting air into the exhaust manifold. Some systems even use a fuel injector to inject fuel into the turbine housing or exhaust manifold. Then there are all of the options presented with a standalone ecu, there are a few different ways the manufacturers implement these systems. Any of them would be extremely dangerous for a street car, I'll see if I can dig up some pictures of what antilag can do to a turbo.

 

[donmagicjuan]

I'll see if I can dig up some pictures of what antilag can do to a turbo.

Sounds exciting, I can't wait!

 

[GVR4592]

For some reason I didn't have any luck with the pictures. I know I've seen some melted turbine housings and wheels somewhere, the search continues.