These guys plug directly into the injector harness, essentially making the injectors stay open for longer (keep in mind we’re talking microseconds here), allowing more fuel into the combustion chamber. If you do go down the 30-buck eBay special road, I hope you don’t mind engine rebuilds… You also have to make sure the unit you purchase monitors the throttle position and doesn’t just wind the rail pressure up to 11. Sounds simple but it’s a little more complicated than simply winding up the pressure.
To put it simply, when each fuel injector opens up, the greater the pressure in the rail, the more fuel is sprayed into the cylinder, and hence more power is made. Some modules plug into the common rail pressure sensor circuit and manipulate the amount of allowable fuel pressure to be stored in there, effectively making the ECU recalculate the fuel volume and timing to account for the increased pressure. But are they really doing your engine any good? There’s usually a fair bit more power, as well as increased fuel efficiency, available from most standard common-rail engines, and installation is often as simple as plug-’n’-play. This is where performance chips or modules come in. However, the vehicle manufacturers (for a variety of reasons including local fuel quality, varying emissions regulations, etc) tend to tune their engines very conservatively. It’s much more refined than simply squirting the fuel down into the cylinder and hoping for the best. The computer can then tell the injectors when to open, how long to open for (called duration) and how many times to open per combustion cycle. Whereas older mechanical diesel pumps deliver the fuel directly to the cylinder, modern pumps cycle it through an accumulator, or rail, which is directly connected to the injectors. Better economy, more power and way more controllability of the fuel delivery when compared to the mechanical pumps of yesteryear admittedly at the cost of added complexity and reliance on electrics – hey, nothing’s free.įor images, videos and the full Unsealed 4X4 experience, read this in our online magazine. This one is for those folks who have made the realisation that technological advancements can actually be a good thing… specifically, common rail diesel injection.ĭid you know that every diesel 4X4 on the market last year featured some sort of common-rail injection system? The simple reason for this is that they work. Quick question: Do you miss carburettors and tape deck stereos? If you answered yes, this article probably isn’t for you.
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