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The heavily retarded ignition also means much of the combustion happens with the exhaust valves open (in fact within the exhaust system), and much of the fuel is ignited by the hot exhaust and/or catalytic converter, hence the burbles, pops and crackles you hear from your tailpipe. “To do this we need to do two things: retard the ignition timing to reducing the torque which allows the car to decelerate normally, and run a very lean air/fuel ratio so too much heat isn’t created,which could affect reliability.” But, burning fuel will create some piston load too, slowing the rate the engine will decelerate on the overrun – so we need to move the energy away somehow to prevent that,” he explains. No pops, no flames, no nothing.īack to Stu’s words of wisdom… “If we want to create a burbling sound while the engine slows down, we need fuel. Normally on an engine when you close the throttle, your fuel injectors don’t fire at all, removing all energy from your engine, allowing it to slow down: this is smooth, quiet, and safe, acting and sounding like all the sensible ‘normal’ cars we’re used to. “Pops and bangs, or burbles as the OEM call it (yes, it’s that common on production cars that even the manufacturers have a name for it!), is simply a calibration feature within the ECU where we set up a specifically targeted, very lean misfire once you lift off the throttle.” How does it make the pop and bangs?įor this bit, let’s start with the expert words of main man Stewart Sanderson from Motorsport Developments… And with modern engine management being so damn capable, it means that they are now commonly mapped into the car’s ECU tune. This is because lots of tuners and manufacturers have realised that owners love these kinds of noises.
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The exhausts of heavily-tuned cars have naturally popped, banged and flamed since the dawn of time, but have you noticed lately, a lot more cars than ever before have been popping and banging from the exhaust when the driver lets off the gas? Mildly-tuned motors and even quite a few factory production cars now have a cool burbling exhaust on the overrun.
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They’re certainly the guys to speak to if you want a safe, but effective map yourself! What is a pop and bang map? But thankfully, the guys at Motorsport Developments are experts when it comes to remapping all factory ECUs, and were more than happy to give us their words of wisdom and help confirm our findings on this subject – so a huge thanks to them.
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Pops, bangs and flames everyone likes that, don’t they? Well, hell yes you do, and because of this, ECU remaps that make your exhaust pop, bang, and kick flames from the tailpipe when you lift off the throttle are hugely popular these days.īut how do they work? And, more to the point, are they bad for your engine’s health? Well, unless you’ve been living in a cave for the last few years, we’re sure you’ve heard loads of comments both good and bad it’s time for a Fast Car investigation into the matter, so we can find out the truth for you guys.Īs this is a bit of a controversial subject in the tuning scene at the moment, a lot of companies, understandably, declined to get involved. But are they safe and should you get one? Fast Car investigates… ‘Crackle maps’, ‘Pop and bang maps’, call them what you will, they’re mega popular.