I've been reading around on the
www.nissan-navara.net forums.
Apparently with a chipped truck, you'll definitely get power upgrades, and better acceleration.
However, remember again that we have low-grade diesel, I believe it's lower than EURO-3 spec. Our diesel is more suited for heavy industry and marine diesel engines, as well as heavy trucks/machinery. It's not really suited for higher-performance engines like in our Rangers, Hilux, Nav's and L200's.
Hence you will probably end up getting smoke from the richer fuel mixture due to the aggressive fuel mapping on these piggy-back chips. Normally the DPF's in our modern trucks are supposed to handle the excess soot but with richer fuel and more unburnt hydrocarbons, smoke will definitely be an issue.
One workaround for this problem, at least for Navara's, is to reset the ECU and allow it to recalibrate the oxygen content of the air-fuel mixture according to how much more fuel you're allowing in. Hence with more oxygen coming in, you get more complete and cleaner detonation even with more fuel - hence theoretically less smoke. From the navara owners in the UK experience, it seems to work. My only concern again is our shyetty diesel.
If you want to reset ur ECU - simply disconnect both battery leads, turn the ignition to ON, pump ur brakes at least 5 times and then touch the two terminals together to remove all residual charge (don't worry, by turning on the ignition and pumping the brakes, you discharge all electricity in the electronics).
This resets all electronic soft-memory in your truck, including the radio, trip meter and the ECU's fuel maps that it learned according to your driving patterns. The ECU then goes back into learning-mode, as if the truck was brand new. (NOTE: this only works for the TDCi Ranger, not the WLT-engine. That engine has no ECU).
Then reconnect the terminals and then start-up and drive the vehicle easy for a few miles. The chip will give its inputs for fuel supply and the ECU will relearn accordingly.
Hopefully that would so
