Anti lag on vr4?

[VR4GOTTI]

does any body know if you kan anti lag a vr4 ? pops and bangs

 

[Hyper_Mike]

You can anti lag anything I think...

 

[VR4GOTTI]

how ? as i know the evos can but never seen vr4s do this

 

[4piknup]

Afaik its extra fuel and timing to make the burn continue into the exhaust headers. You need a ecu that can do it for you

 

[Cranked]

You can get chip that will do it. Provided of course you have a chippabke ecu.

 

[Hyper_Mike]

I always thought it was purely ECU related, almost as if its making the engine misfire?

 

[VR4GOTTI]

so get my ecu chipped?

 

[Velocity Racing]

If you want antilag like this then you will need an aftermarket ecu that supports it (ie has Motorsport options). This is with a ViPEC on my Evo.. But any Motec, Link, Autronic, Gems, Haltec etc will do it.

http://youtu.be/DzNRnZtc2tI

If you just want antilag in your launch control then you can do that with a stock chipped ecu

 

[Velocity Racing]

Should also add that 'propper' anti-lag works by injecting fuel and igniting it after the piston has passed TDC whilst off throttle this producing no torque to the crank but gives lots of exhaust flow into the turbo. The other thing is also does is randomly cut the ignition allowing fuel to bypass with out being ignited by the spark. The extra fuel plus the ignition cut (the misfire part) mostly helps with cooling everything but also gives the pops and bangs, but its the exhaust flow that really keeps the turbo spooling.

The other side of this is that the ALS needs air to work, so you need to either have some sort of air bypass solenoid that allows some airflow into the engine or a fixed throttle setup that say means when your off throttle the throttle butterfly stays open between 10-20% allowing air into the motor to help burn the fuel and also to help cool.

The side effect of this is the fixed throttle is that 10-20% means at idle the engine will be reving to say 3k+ So to fix that the ecu runs in a cyclic idle or rotational idle mode where the ignition is randomly cut to bring the revs down giving that supper lumpy idle (see vid below), the software then slowly phases that cut out as you increase the throttle (say 3-5% above the fixed position).. It works well and sounds cool but makes the car super tricky to drive at road speeds!

It works well for motorsport applications and I really notice the response difference with the ALS on and off, but between the drivability and wear and tear on everything its probably not advisable for road use.

hope that's of some use


http://youtu.be/AhiovwswgeA

 

[evo-gsr]

Lewis..that first video is awesome.

 

[LumpyVR4]

On a side note, you can get something on a stock ECU that some people call anti-lag. This 'anti-lag' or 'Launch control' actally brings the rev limiter down to around 4500 rpm when the vehicle is stationary. The rev limiter drops spark to hold the revs down. This means unburnt fuel goes into the turbo where the heat ignites it and it spools the turbo.

It's good for drag launches because you can hold the throttle flat, side step the clutch and away you go with boost already available.

 

[4piknup]

I think the jspec evo7-9 use the egr valve to add the extra air?

 

[evo-gsr]

Isnt anti lag and launch control two completely different functions...? As far as I'm aware it is.

 

[VR4GOTTI]

thanks everyone

im just after anti lag at launch control so will get my ecu chipped for this

 

[Velocity Racing]

hehe thanks Jamo.. just messing around with the iPhone 5S slowmo.. come up pretty good.

 

[Ross Cox]

http://www.youtube.com/watch?v=cG9psWfGCwM
4.23 My VR4 with antilag.
Cheers
Ross

 

[Ross Cox]

http://vimeo.com/81174290
Might hear it in this vid too. Just click on the Watch on Vimeo button.
I run an Autronic SMC 1.91? version.
Cheers
Ross