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They’re almost like a full replacement ECU and provide much more comprehensive mapping, although at the cost of added installation complexity – having to be wired into the harness at several points. They work on both rail pressure and injector duration and several other operations controlled by the ECU, such as turbo boost pressure. These modules are a little more complex than the previous two. With that said, a workshop will be able to do it for a reasonable price (and usually a whole lot neater than most people out there).Īs with all performance modules, while upping the injector duration is the main function of this type, quality units will have plenty going on behind the scenes – such as recalculating several key algorithms in the ECU to safely increase the power right across the rev range without unduly affecting reliability – which is key when installing any power-up modifications, I reckon.
#Jdm performance chip tuning reviews install#
They’re a little trickier to install than the rail pressure affecting types, needing to be spliced into the factory harness – but if you’re handy on the soldering iron they’re still able to be installed by a competent home mechanic. 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.
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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.
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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. For images, videos and the full Unsealed 4X4 experience, read this in our online magazine.