Ben shults
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anti lag? standard ko4
- Thread starter Ben shults
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I wouldnt.
The way this works is to maintain fuel flow at throttle lift,and ****** ignition severely,and some combstion then takes place in the exhaust manifold and turbo housing,keeping it spinning,and reducing lag.
The other side of this process is very high EGTs,torque spikes across the turbo shaft,and a potential for failure.
Yes some do map it in,and the sensible ones program it to work at launch only etc.
To run this properly,you need a turbo that is designed with ALS in mind,and they are costly.
I do have ALS,and I do have a very expensive Owen Developments turbo,but they don't recommend using it either.
The way this works is to maintain fuel flow at throttle lift,and ****** ignition severely,and some combstion then takes place in the exhaust manifold and turbo housing,keeping it spinning,and reducing lag.
The other side of this process is very high EGTs,torque spikes across the turbo shaft,and a potential for failure.
Yes some do map it in,and the sensible ones program it to work at launch only etc.
To run this properly,you need a turbo that is designed with ALS in mind,and they are costly.
I do have ALS,and I do have a very expensive Owen Developments turbo,but they don't recommend using it either.
Ben shults
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Basically,on that turbo,you simply don't need it.
It may sound good,and I've driven ALS equipped cars before,but as I've said,EGT's go way high,and turbine and shaft failures are not uncommon,and exhaust damage may occur as well.
The sound you're hearing is the sound of fuel igniting in the exhaust manifold.
The other characteristic that changes is the way the car feels on throttle closure.....it tends to push on a bit rather than losing power and stopping,and that takes some getting used to,depending on how aggressive the ALS is.
On a road going turbo,it should be a very mild setup,and even then,just remember that the K04 is not the most robust of turbos.
anti-lag isn't road legal either is it? I know rally cars have a switch to disable it when driving on public roads...
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I don't know the legality of running ALS,but the main reason for disabling it is to preserve the life of the turbo.
A stock GTX3076 or similar isn't cheap,and an ALS spec turbo for rally car is much more costly.
I'm sure the new M3 and M4 turbo has anti-lag in which case it must be road legal?
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My guess is these are using an air bypass system similar to that used on modern WRC systems,which would be impractical to retrofit to our cars.
This method is much kinder in terms of EGTs and stresses to the turbo.
s3_trev
Northern Ireland
What kind of car do you have Ben? And what other mods do you have?? Im wondering if you already have a beast and want to add this to it as you are running out of things to do. Or if you just randomly want to add it to your standard car?
It was Top Gear or some other 2p motoring show I watched it on, and I'm sure they said it dumps fuel into the exhaust side to keep the turbine spinning even when you aren't on the throttle. I don't know if thats known as an air bypass system, or if they got it wrong but they definitely said that (whoever it was) lol.
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The basis is to continue fuelling after throttle off then ****** the ignition and burn the fuel in the exhaust producing enough gas flow to keep the turbine spinning but you need air as well and an air bypass system is kinder to the turbo and can be adjusted more easily.
The result in terms of off throttle boost is similar and the TG explanation is what you'd expect.
I run Antilag on my S4 bi turbo. It's something I did a couple of years ago, i've not turned it on for a while, i never found the time to fully tune it.
Principle is if you go on boost for a x number of seconds, when you come off you are still on boost for x number of seconds. It will only activate one coolant temp is above a certain temp, and will deactivate if EGT gets too high. I can adjust it so that it's anything from a few pops and crackles to over 1 bar of boost.
Rick
Principle is if you go on boost for a x number of seconds, when you come off you are still on boost for x number of seconds. It will only activate one coolant temp is above a certain temp, and will deactivate if EGT gets too high. I can adjust it so that it's anything from a few pops and crackles to over 1 bar of boost.
Rick
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I had it on my Escort,on a Pectel ECU,which being "old school" ALS was pretty aggressive.
The current setup on the Syvecs ECU has all of the safeguards you're describing,plus 2 levels of ALS,so it's a lot kinder to the turbo,and like you say,I don't use it much.
so if a lower amount of boost safe?
and is there any point having a safe low amount? like any actual benefit other than pops?
As i was actually thinking about having rick do this to mine lol
