Antilag And Datalogit

[Kaido_RR]

Hi,

after reading alot about antilag, it through i would ask what type the datalogit uses..

is it the type in which you take your foot of the gas and the antilag turns or is it the type which is like a rev limiter, launch controll type?

cheers michael

[paulr33]

the antilag that comes with datalogit hooks up the clutch switch and when active retards the timing and runs really rich. its only active with the datalogit box plugged in and the clutch wire connected via the datalogit box and the option enabled. you can set how much timing to retard and how much fuel to waste, so when you press clutch in its active, for gearchanges

[Kaido_RR]

the antilag that comes with datalogit hooks up the clutch switch and when active retards the timing and runs really rich. its only active with the datalogit box plugged in and the clutch wire connected via the datalogit box and the option enabled. you can set how much timing to retard and how much fuel to waste, so when you press clutch in its active, for gearchanges

<{POST_SNAPBACK}>

awsome thanks paulr33

[The Mafia]

ok, now has anyone set this up successfully?

I tried it and it didn't work.

I heard on the grapevine that it only works with the powerfc Pro?

[FATGTS-R]

While being out of my depths in relation to antilag systems I would dare say its the stationary, launch type system only.

From what I understand, for it to work on the fly during gearchanges it would require additional hardware along with the required software. You would need something to keep the throttle butterfly slightly open during pedal lift off.

[paulr33]

ill be having mine wired in purely just so i can prove it works but certainly dont plan to use it, as ceramic wheel go bye bye. i dont see why it wouldnt work with the standard rb25 powerfc, the fc pro supports antilag as much as the normal does, ie: they both don't.

the hardware is basically the datalogit dongle box which has a circuit board and some processors/chips on it. you wire in the clutch wire to this box on an external input pin and then activate it in the software which writes the settings to the datalogit dongle box. its then active from then onwards, providing its turned on in the software, you wired in the clutch switch correctly and you have the clutch pedal pressed in.

its a software based antilag and doesn't really cater for things like keeping the throttle body open, spark plug in the exhaust housing, and other possible permenant anti lag solutions

[FATGTS-R]

Thats what I was getting at. As a software only antilag I dont see how it could run on the fly during gearchanges. Maybe if the foot was kept flat to the floor but not sure even then if it would work.

Are you saying it will run anit lag on the shifts, or am I misinterpreting your post?

My ecu has an antilag feature, but without additional hardware it can only be used on launch. Instead of being wired to the clutch pedal it has a dash mounted button. Hold the button in, press the pedal and it makes positive boost pressure.

As mentioned, I havent touched the surface in researching antilag systems so I stand to be corrected.

[paulr33]

the clutch pedal has a wire which is used for signal, but im not %100 where the signal goes, as the ecu has no switch display for clutch pedal, only neutral selection on the gearbox. but it may still goto the ecu, just the powerfc doesnt show it under SENSOR SW / CHECK. The wire is switched on/off when you press/de-press the clutch pedal. You disconnect this circuit and run the wire directly to the datalogit dongle box. It then watches the clutch wire and when it detects the clutch pedal has been pressed in, it does a temp ign retard and rich fuel change whilst the pedal is pressed in. once the pedal is depressed it takes away the temp settings (back to normal).

The aim of the datalogit appears to be to keep the turbo spinning during gearchanges but it could be used for launch also but it would be lots harder. you could have so sit at idle with clutch fully in, it would apply the settings and as soon as you moved clutch pedal out enough to trigger the switch it could go back to normal ign/fuel settings, so you would have to be super quick for it to be a antilag launch.

The manual lists the function as

stutter box / bang bang / antilag feature

[FATGTS-R]

OK but wouldnt you still need throttle for it to work? In your scenario, the clutch goes in, and it retards and goes rich but it will still need throttle to spin the turbo, wont it? Which is why I dont understand how it could spin the turbo on the shifts if you lift off.

On my setup, if in neutral and hold the antilag button in, nothing happens at all, no difference, sounds like always. But press the throttle deeply while holding the button and it spools away.

But I really dont know what Im going on about so yeah, lol.

[scathing]

OK but wouldnt you still need throttle for it to work? In your scenario, the clutch goes in, and it retards and goes rich but it will still need throttle to spin the turbo, wont it? Which is why I dont understand how it could spin the turbo on the shifts if you lift off.

Two words for you:

Flat Shift.

Actually, let me add another two words after that.

Rev limiter.

Most anti-lag implementations I've seen use a programmable rev limiter as well as the rich running, timing modifying, changes to the ECU. Mainly so you can just hold a specific RPM for your launch, without the user having to get their throttle control just right.

Even if it doesn't, your ECU's redline rev limiter will do a good enough job of not having your engine rev itself to bits.

With your rev limiter, you can just change gears without having to worry about moving your right foot. Your throttle stays open, and Bob's your uncle.

Edited January 20, 2006 by scathing

[The Mafia]

Any antilag needs lots of throttle or the car will stall.