Dan3800 Posted March 15, 2017 Report Share Posted March 15, 2017 Hi all, first time here.Have a 3800 V6 twin turbo car. Runs good. Been 8.81@158 so far.Wanting to setup the antilag to use with transbrake/bump box etc.Can someone point me in the right direction for basic settings with the antilag? CheersDan. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 16, 2017 Report Share Posted March 16, 2017 Hi Dan,Turbo drag racers normally use "launch control" rather than antilag. Some refer to it as "two step".Usually it is activated either by a clutch pedal switch or the transbrake button. When sitting on the line with the transbrake on or clutch down the launch strategy is activated. The launch strategy will normally consist of a lower than normal rev limiter (usually ignition cut), with the remaining sparks retarded and sometimes a little extra fuel added. The limiter and retard combined increase exhaust energy and create boost.Some basic settings:Leave fuel trim off to start with, it is normally not needed. Only add fuel if you cant get enough boost with reasonable retard levels. There are many different ways to do your retard table but probably something like below is the most common: davidbek95 1 Quote Link to comment Share on other sites More sharing options...
Dan3800 Posted March 16, 2017 Author Report Share Posted March 16, 2017 Cheers for the reply!Yeh a lot of odd terminology gets thrown around and you found me what I was looking for. I was thinking antilag just because I thought it was a boost builder. Anyways, ill definitely put this to good use.Cheers for your help.Dan Quote Link to comment Share on other sites More sharing options...
Dan3800 Posted June 24, 2017 Author Report Share Posted June 24, 2017 Hi AdamW,Wonder if you can help? I have set up the car the way it says in the above table. It works, only issue is its always working. Like I didnt even wire it up off the transbrake. Its on all the time. Is it to do with the pullup resistor or active edge settings in the table?Cheers in advanceDan. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 24, 2017 Report Share Posted June 24, 2017 Hi Dan, how does the transbrake switch work? Does it supply 12v to the ecu when pressed or gnd? Quote Link to comment Share on other sites More sharing options...
Dan3800 Posted June 25, 2017 Author Report Share Posted June 25, 2017 Well at the moment nothing is connected to the ECU. The transbrake works independantly, 12 through the button on the shifter to the solinoid and then soilinoid to ground. It was weird, I set up the table above and hadnt done the wiring yet and it was on. Id expected to have to connect a DIG input for it to work. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 25, 2017 Report Share Posted June 25, 2017 (edited) With those settings above and nothing connected to the DI, launch would be on all the time. Set the DI active edge to falling and it should turn off. Edited June 25, 2017 by Adamw grammar Quote Link to comment Share on other sites More sharing options...
Dan3800 Posted June 25, 2017 Author Report Share Posted June 25, 2017 Yep thats what I have. Cheers.So because my brake is activated with 12v I can just use a relay to change it to a switching gnd? Then connect to DIG? Quote Link to comment Share on other sites More sharing options...
Simon Posted June 25, 2017 Report Share Posted June 25, 2017 (edited) If the switch is supplying 12V then the Di pullup will need to be turned off.No need to adjust the signal with a relay. Edited June 25, 2017 by Simon Quote Link to comment Share on other sites More sharing options...
Dan3800 Posted June 25, 2017 Author Report Share Posted June 25, 2017 Like this? Then just 12v from the brake straight to the DI1? Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 26, 2017 Report Share Posted June 26, 2017 Like this? Then just 12v from the brake straight to the DI1? Yes, except active edge should be rising. Quote Link to comment Share on other sites More sharing options...
Dan3800 Posted June 26, 2017 Author Report Share Posted June 26, 2017 Eairlier you said that active edge should be changed to falling, is that because you thought it was going to be triggered with a NEG?So rising is for a POS trigger? Sorry for all the questions. This stuff always confuses me lol.. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 26, 2017 Report Share Posted June 26, 2017 (edited) I said set it to falling earlier because at that time you had nothing connected to the DI and you wanted it to be turned off.When your switch is turned "off" the DI will be at 0V, we call this "low", when you turn the switch/button "on" the DI will see 12V, this is called "high". So, we set active edge to "rising" because we want the launch to turn on when our DI "rises" from low voltage to high voltage. Edited June 26, 2017 by Adamw Dan3800 1 Quote Link to comment Share on other sites More sharing options...
Dan3800 Posted June 26, 2017 Author Report Share Posted June 26, 2017 Champion! Thanks so much for your time. Simon too, much appreciated. Its a non stop leaning curve lol.. I'll get it sorted and see how she goes! Quote Link to comment Share on other sites More sharing options...
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