It is human nature to evolve and try to get the maximum potential out of our rigs. These days with the availability of diesel tuning options being plastered across social medial, it is in no doubt on every any petrol head (excuse the pun) 4wheelers alley and to do list. (More power, more boost, more fun).
Unfortunately its not just as simple as cranking up everything up on your truck and having it last forever. The boring must come first before excitement and reaching your tuned potential, this comes in the form of careful planning, reviewing your options and ensuring your truck is properly serviced and maintained.
If you have a late model common rail Hilux or a early td42 patrol , there is a list of things you want to consider before trying to get more power from your noble steed.
One of the first and foremost is your injectors. If we are dealing with late model common rail truck, we check the injector adaption values are in spec , this gives us a good insight into the condition of the injectors. If the vehicle requires the lower washers to be replaced i.e 1kd Hilux pre-august 2011 or the pj ranger we ensure that this has been done before any tuning is started. If there is an existing issue, it can cause compression to leak into the oil contaminating it with carbon blocking oil pickups and may result in costly engine failure.
If any of these occur and require attention, the last thing you want to do is increase the output of the motor without rectifying these issues. If you have a mechanically injected diesel such as 4m40 , td42 , 1hdt , 1kz to name a few, these have about a 100,000 service intervals that should be kept up with, if the injectors regardless of the vehicle are left un-serviced and have poor spray pattern they can cause a host of issues such as cracked pistons , high egt , and black smoke just to name a few.
The next thing we at Trundles often take into consideration especially on late model common rail trucks, is the EGR system. We have seen manifolds over 30% blocked with as low as 70,000ks on the clock and just two years old. With more substantial km’s, the higher the probability of unwanted deposits. We have removed 4kg of carbon from the inlet of a 1kd hilux with 210,000 on the clock and we’ve had a 3.2 pajero with a 100 percent blocked inlet on one port which was unsurprisingly performing poorly.
If you are unsure if your car has EGR or not, it may be best to consult your preferred workshop to have a manifold off and decarb and if the vehicle is for offroad use only, implement a egr delete.
Ensuring that your servicing is all up to date (including everything from transmission , diff , transfer fluids to air and fuel filters and engine oil and filter servicing) gives you a good chance in avoiding the above issues and give you a solid foundation to start your tuning process.
As boring as it may be to crush your whole modification budget on boring repairs and maintenance rather than big turbos, inter-coolers and waste-gate :), it is unfortunately the ground work that must be done to ensure the optimum result is achieved come tune time and will ensure trouble free motoring and no costly engine failures in the future after the tune
– Trundles Automotive