I can't help wonder why manufacturers appear to struggle with the basic tune?
Chipping remapping or retuning a diesel appears to see good improvements on all front's afaict. Better power output is the first obvious one. But also better economy as well, with less smoke.
My understanding is the black smoke is caused by Unburnt fuel, so what's the difficulty about tuning a diesel that means its easier to fit a Dpf than tune the engine to give less smoke or a cleaner burn?
I'm missing something clearly. No pun intended. 
Apart from waisting fuel, why can't the Dpf set its own throttle at 2000rpm while the car is on the drive? Do its regen, then let the driver in his way?
Edit, actually, that wouldn't be very fool proof.
Manufacturers have considerably more constraints than the tuning companies, not least they have to meet the full EC specs which gives the compromised tunes where as once built and type approved, an MOT smoke test is the only real check the engine will ever see from that point on (and the new visual inspection of emmission control components).
The economy gains on modern diesels are some what over stated, tuning boxes as an example may appear form the TC (trip computer) to give better economy but any improvements are negligable (the tuning boxes modify the rail pressure signal to the ECU making it think it needs a longer duration of injection so more fuel is dumped in but, the TC uses the duration v pressure to calculate economy so the TC figures become over inflated).
Clearly a full remap which also increases boost can give big gains and on some engines simply increasing fueling can do similar because the engines run with a large percentage of excess air which improves throttle response (no need to spool the turbo up fast when acceleration demand is input).
A big issue on a number of vehilces with the tuning is the drive train, many of the boxes fited to the pwoer plants are run close to the max torque so a very negative impact can be seen here! (as an example, the M32 used on many of the 1.9 CDTi's needs an oil cooler fitting to make it last with increased torque as it runs dam hot in standard tune and the oil degrades quickly resulting in bearing failure).
Easiest way to spot a regen is to watch the fuel consumption, it drops by circa 20 mpg and often there is a drone that can be heard from the rear silencer (dependent on body shape etc with obviously an estate car being less sound deadened in that area than say a saloon or hatch), they are often more sprightly to with a snappier throttle response (althoguh this is only noticed if you apply throttle, when cruising or on cruise control it can easily go unspotted)
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Topic: DPF removal Q... (Read 4280 times)