That's a given as turbo diesel engines are burning a lot more air than N/A diesel engines. However to get the same power out of an N/A diesel as a turbo diesel the engine would be huge & burn much more fuel.
... so explain why drivers over & over again report that remapping not only gives more power but also improves their fuel economy. Also the difference between 16.2mpg & 15.7mpg for a few seconds (WOT 50-80mph in 5th) will pale into insignificance compared to 58.4mpg compared to 67.4mpg (70mph cruise) for several hours. That's taken from a BMW 320d map & published CdA/Crr data.
That differential sounds much too large. Is it a bonafide with-without turbocharger comparison for a vehicle that is otherwise exactly the same?
Serves you right, you planet vandal!
Nice way to take something complexly out of context which has NOTHING to do with the point you're trying to make. I was comparing the fuel economy for a 50-80 WOT acceleration run & then 70mph cruise on a 320d on factory map v's performance remap. It's perfectly correct as for the same power the injector duty is reduced by about 13%. In this case a 3% increase in fuel usage for 7.5s is countered against a potential 15% reduction in fuel usage for several hours... but actually a WOT 50-80 may use less fuel as Id guess that the remapped engine would reduce the 50-80 time by about 5%.
So you're comparing a 68bhp N/A to a 150bhp TD... what we need is a 150bhp N/A engine that'll be a 4.0 to 4.5l unit.
The emissions thing isn’t quite correct in its analysation. I bought a 'pan-america emissions legal' turn key engine for my Ultima. It required about 15 hours of fettling to get it to pass on UK fuels, the emissions tests it was failing on it would have passed had I been buying US pump fuel. Most of the ‘factory approved’ remaps actually give better emissions with BS standard fuels than factory maps but if you take the car to another country then the emission levels maybe higher. This is because the exact fuel composition & additives change from country to country, even in the EU.
Thanks for that explanation, it reminds me of my friend who owned a Honda CBR 600 which resolutely refused to run on anything other than BP petrol! It also sounds a bit like the business of making central heating boilers, where the manufacturer typically attempts to make the same boiler sell in as many markets as possible with as few boiler variants as possible. Similarly to road fuel, not all methane (natural gas) is the same, and the variations throughout the EU can be quite significant. I've considered buying one of these, and trying different fuels to see if I can tell the difference. Any thoughts on that? I'd be interested in a remap too, but I'd be a little worried that most insurers would decline cover, and once you've told them it sounds a bit fishy if you call back two days later and say you've restored the ECU to factory settings!
