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Message: <blockquote data-quote="wiramod11" data-source="post: 787355" data-attributes="member: 2391">hahaha...where in earth got back-firing system..lol..heheheback fire normally happens when your engine were running too rich mixture... anyway guys eventually i guess the mis-firing system name camefrom initial D... but the real name is call ALS - Anti Lag System this been commandly use in WRC cars.... I just found some info around the web ....I think some people might find this information interesting!TURBO-CHARGER ANTI-LAG SYSTEMAutronic turbo-charger anti-lag system uses a coordinated fuel and ignition control strategy in conjunction with a large effective throttle opening to produce a substantial reduction in turbo-charger "lag". The system is effective from a standing start, throughout up & down shifts and when accelerating out of corners. The system can be used with a large fixed throttle opening, or in conjunction- with electro-mechanical throttle by-pass valve or a throttle "kicker" solenoid. The system incorporates an optional turbo-charger cool-down function that ensures rapid cool-down prior to engine shutdown.This anti-lag system allows the engine's large throttle opening or bypass to produce a considerable amount of hot high velocity exhaust gas that sustains high turbo-charger speed.This is achieved with a higher than normal idle speed (2000 to 4000 RPM typ.). The cool-down mode uses a different strategy to produce a large volume of cool exhaust gas for rapid turbo cool-down and it simultaneously controls idle engine speed with the large throttle opening required.CAUTIONThis anti-lag system, like all others, causes considerable heating of engine, exhaust valves, exhaust manifold, turbo-charger and exhaust system. Consideration must be given to the possibility of component damage or possible vehicle fire.Set-up of the anti-lag system MUST NOT be attempted without monitoring EXHAUST GAS TEMPERATURE (EGT) in the vicinity of the turbine wheel. A knowledge of the maximum safe working temperature a of the turbo-charger turbine is essential. A turbo tacho and a pressure gauge to measure the turbo compressor outlet pressure are also useful tools to assist in the setup of anti-lag.Operating Modes1. Throttle opening/bypass controlled anti-lag, using a mechanical or electro-mechanical throttle opener or bypass. ECU activation of the anti-lag function with dash mounted inhibit switch.2. ECU controlled throttle opening/bypass using an electro-mechanical throttle opener or bypass valve. Dash mounted switch allows driver selection of and-lag function.3. Fixed throttle opening with full automatic control by ECU with manual override or manual control of and-lag and cool-down functionNotes:- Modes 1 & 2 do not effectively use the fast cool-down function. Anti-lag action is terminated by excessive engine temperature (> 110 degC)Mode 3 is the simplest mode to use, since it requires no additional engine mounted hardware (eg: throttle kickers or solenoid controlled by-pass valves). The cool-down mode is also most effective in this mode.MODE 1.MODE 2.MODE 3.Mode 3 use a fixed large throttle opening (typically 8 to 20%). This modes antilag function uses this large opening, high idle speed (typically 2500 to 400O RPM) and ignition retard to produce a considerable amount of hot high velocity exhaust gas that sustains high turbo-charger speed. The cool-down mode uses a different strategy to produce a much cooler exhaust gas temperature and simultaneously control idle engine speed with this large initial throttle opening, when anti-lag is not active.Activation.1. Manual:- Ground anti-lag I/P pin to switch from cool-down to anti-lag mode.2. Automatic:- Anti-lag activated by engine RPM exceeding 500O RPM and remains active far 15 seconds after RPM falls below 5000RPM.3. Auto/Manual:- As per automatic mode above but inhibited if Anti-lag I/P not grounded.ANTI-LAG SETUPThrottle opening, ignition retard and the resulting anti-lag no-load RPM must be chosen to produce the best compromise between excessive exhaust temperature and good anti-lag action. More throttle requires greater ignition retard to control no-load throttle closed RPM, and results in higher EGT. Anti-lag ignition timing for small capacity 4 valve central spark plug combustion chamber engines should be in range -20 to -30 deg. For large capacity 2 valve engines -2 to -2O deg should suffice. Ignition timing retard should be maintained up to a MAP value as high as possible but must be eliminated before 1 atmosphere is reached to ensure adequate off-boost performance. Below anti-lag RPM normal ignition timing should be restored so that engine torque increases with decreasing RPM in order to stabilize RPM. Additional fuel during and-lag is often required to help control EGT. A value between 10 and 20% extra is usually beneficial. The User defined PWM table functions as the anti-lag ignition offset table 1% = 1 deg retard.eg:- Anti-lag idle @ 2600 RPM approx. User Define PWM output %(0 to 100)Load/RPM Example TPS/RPM ExampleRPM RPMLOAD 2400 2600 4000 TPS 2400 2600 400097.0 0.0 40.0 50.0 12.0 0.0 40.0 50.098.0 0.0 0.0 0.0 15.0 0.0 0.0 0.0Engine idles @ 2600 RPM with 88 to 92 kPa MAP below butterfly with 30 – 40 = -10 deg ignition. Gives 130 to 150 kPa MAP above butterfly.!!!! IMPORTANT!!!!1. Irrespective of the actual throttle opening used the ECU must be reset so that the selected open is seen by the ECU as 0% open. Throttle limit learning must be performed each time a new throttle stop setting is set.2. Before attempting anti-lag set-up it is most important that correct fuel and ignition calibration be achieved for "normal" engine operation.COOL-DOWN SETUPThe cooldown function produces a stable idle with an exhaust sound similar to that produced by engines fitted with long duration camshafts. This disappears as soon as the engine is laboured at low RPM or loaded at higher RPMs. Spark plugs normally remain clean even during extend periods of cool-down idling. Cooldown MIN RPM and MAX RPM settings are set to values above and below the Desired cooldown idle RPM. These values should be at least 800 RPM apart to prevent idle instability. The cool-down mode MAX THROTTLE setting is usually set to 5% for best drivability.eg:- Cool-down idle @ 1700 RPMCOOLDOWN MIN RPM - 1400 RPMCOOLDOWN MAX RPM - 2400 RPMCOOLDOWN MAX THROTTLE = 5%But forget why i got it liao... quite a few years back... i just copy it and put it into my documentation nia... hehhe :D</blockquote>

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