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No doubt these devices do something to enhance performance.
Surely with enhanced performance there is an increase in fuel consumption
Dash computers are not as acurate as fill to fill calculations.
From home down to Dover , 250 miles I always use less fuel than in the reverse direction.
11. What do diesel add-on tuning boxes do?
We do not fit add-on tuning boxes, which normally just interfere with engine management signals to trick the injectors into adding more fuel. Our service is a custom re-map of your ECU, specifically for your vehicle.
These differ from how a remap works. A tuning box relies on the principal of more diesel fuel = more diesel power. That theory is correct and boxes do increase power, but they can’t control the amount of black smoke (maximum permissible visible smoke limit) coming out the exhaust.
Too much smoke is undesirable, both environmentally and visually. More importantly, the black smoke is un-burnt diesel fuel attached to combustion chamber, with deposits exiting straight out the exhaust pipe, thus wasting fuel which hasn’t had any effect on power gain. The results are raised emissions, a higher thermal load on the engine (i.e. exhaust temperature) and frequently defects such as "bucking" are often the result. It should be clear what this means for your engine.”
In a modern engine there are complex engine control systems that cooperate with each other to make everything work perfectly. A diesel box manipulates some signals in order to either increase the injection time or fuel pressure. Unfortunately this manipulation is done entirely without the engine control system’s knowledge. This means that a diesel box tricks the engine control system of the vehicle and the consequence is that a large amount of values and control data will be incorrect, resulting in:
The on board trip computer shows improved fuel consumption, but the real amount left in the tank is less, as fuel is being injected without any of the sensors detecting the additional amount entering the cylinder.
The anti skid program (ESP) is disturbed because of incorrect torque value
No loose boxes and wiring flexes in the engine compartment
The automatic gearboxes get incorrect torque value
Torque reduction when shifting gear (for comfort and durability) is not retained
The regeneration (emptying) of particle filter will not be optimal
The calculation of exhaust temperature is disturbed
The calculation of service interval is disturbed
The diagnostic system is disturbed
A lot of information but it does contain an explanation about the trip computer getting the fuel consumption wrong.
Quote:
The on board trip computer shows improved fuel consumption, but the real amount left in the tank is less, as fuel is being injected without any of the sensors detecting the additional amount entering the cylinder.
We bought a Cheetah tuning kit. Used it for a 300km trip using the basic settings that it came set at.
Must admit we are quite pleased so far, it has taken the consumption from 23.8 mpg to 25.7 mpg.
Mike has adjusted it one notch to see if we can get even more mpg. and more power.
We will let you know the results in a week or two after our next longish trip.
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