![]() Volkswagen Jetta TDI 1.9L ALH 1999.5-2003įile:ALH BSFC map with power hyperbolae.pngĮach curve represents a constant horsepower developed by the engine. The cylinders are deactivated when engine speed is between 14 rpm, and torque between 25 and 75 Nm (the max torque is 250 Nm). At steady, low speeds and loads the fc can be reduced by 0.7-1.0 l/100km. What would be the effect of only deactivating 2 cylinders?Īnyhow, the article claimed that only deactivating the cylinders reduced fuel consumption by 0.4 l/100km in the NEDC cycle, while with the Start/Stop system 0.6 l/100km. What would be the effect of only shifting gears? Is that BSFC for the engine in 4-, or 2-cylinder mode? Or maybe combined? Deactivating half of the cylinders helps to increase the load, but among the things the article didn't state are: By going to an rpm and load closer to the BSFC sweetspot the fuel consumption can be lowered by 20%. The red line '1' graphs constant engine power, in this example 30kW. There was an article on VW's cylinder deactivating TSI in a magazine (Serwis motoryzacyjny, 11/2011) and it had the following BSFC graph, illustrating an example of how cylinder deactivation can help reduce fuel consumption. Toyota 3.0L V6 1MZ-FE and possibly the 3.0L 3VZ-FE (Previous Engine) Saturn 1.9L BSFC: Included imperial units, Constant Horsepower curves, Engine Load %, and extrapolated to redline.Īpproximate Vacuum readings on Magenta Optimum Efficiency Line: Mercedes Benz 300SD OM617 5 cylinder turbo dieselīSFC map generated from the information below.įile:Saturn 99 1.9l dohc bsfc.jpg Saturn 1.9L DOHC Modified On a chassis dyno with a lean burn capable manual transmission equipped vehicle, with no evidence of reduced BSFC at the low load, low RPM regime where lean burn operates: Electric assist does not appear to have been accounted for, so the high-load, high-RPM BSFC is grossly underestimated. Useful for determining at what load and rpm your engine is making the most power out of the fuel given to it.įile:Geo-1L-bsfc-chart-reconstruction.gifĬVT, which would have lean burn if the car tested was a Japanese-market Insight. ![]()
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