evolution 4/Anti-Lag?

[iXNAY]

hey guys,

took my mates evo 4 for a drive today was a great car and got a really nice power curve and gets off the clock pretty quick.

when i was looking at the engine, i seen a pipe going from before the turbo to before the throttle body, after a bit of thinking and looking i made it out to be a one way valve so that it reduced turbo lag..

cause before boost the engine would suck in air through this pipe cause the valve would be sucked open by the vacuum in the engine, then once boost started the compressed air would force the one way valve closed and then all the boost would be forced into the engine.

would i be correct in thinking this and would it make much difference if it was to reduce turbo lag?

was wondering about it and thinking of setting something the same up!

regards
Ryan

[kiwieurospec]

Not sure for an evo 4 but sounds like egr valve for polution.

[AB]

EVO 4 come setup with anti-lag from the factory, but it works differently to how you described it. It's explained on autospeed:
"Interestingly, a secondary air injection system (aka anti-lag system) was also introduced. We believe that production versions of the Evo 4 have all the necessary air injection hardware in place – but the electronic control system to make it work was reserved for competition rally cars..."
It eliminates turbo lag by burning fuel in the turbo, giving you full boost at idle and the popping sound that rally cars make.

[iXNAY]

This is the pipe im talking about!

[www.18u]

Its a b.o.v. dude just a plumb back type.

[silo]

yep, ill second that :beer

[iXNAY]

holey shit ive been looking at it the wrong way......

well dont i feel stupid!

hahaha sorry to waste everyones time!

[Junkers]

EVO 4 come setup with anti-lag from the factory, but it works differently to how you described it. It's explained on autospeed:
"Interestingly, a secondary air injection system (aka anti-lag system) was also introduced. We believe that production versions of the Evo 4 have all the necessary air injection hardware in place – but the electronic control system to make it work was reserved for competition rally cars..."
It eliminates turbo lag by burning fuel in the turbo, giving you full boost at idle and the popping sound that rally cars make.

Sounds interesting, can anyone on here vouch for that?

[AB]

I think it's that silver pipe that runs along the front of the head and down towards the turbo, perhaps iXNAY could have a look and see where it goes?