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Comparison of engine variants BMW 318d GT and BMW 325d GT

Arturo Rivas
Comparison of engine variants - BMW 318d vs. 325d
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M 10 or M30 were known as famous BMW engines in the past. Today everything is a little more complicated, the basic engine we are talking about here is called the B47D20. Its predecessor is hardly less confusingly called N47D20 and is still installed in the 325d Gran Turismo. Both are two-liter diesel, 68 hp are in between and around 6,000 euros purchase price. But now it's getting spicy: Because soon the old N47 in the GT will be replaced by the new B47 with 225 PS. So how good is the old engine in the 3 Series GT?

An old car tester wisdom says that when in doubt, you should always drive the less powerful car first in a comparison. Do we. The diesel in the 318d is 150 hp, it has variable turbine geometry and all the other subtleties that one expects from a modern diesel engine.

Arturo Rivas
Adjusted for equipment, the 318d is around 4,700 euros cheaper than its 68 hp more powerful Brother 325d.

BMW 318d GT seems almost inhibited

But the N47 in the 325d is by no means old-fashioned or in In this case, the old light metal, because the crankcase is made of solid aluminum with thermally joined gray cast iron bushings. Twin-turbo charging with two different-sized turbochargers, common rail injection - the N47 has it all, and confusingly, even the bore-to-stroke ratio is exactly the same as that of the successor B47: 84 by 90 millimeters.

Nevertheless, the differences between the two BMW diesels in the driving comparison are greater than expected. Although the numbers are already clear: The 325d leaves its brother behind by 2.4 seconds in the sprint from 0 to 100 km /h. It feels in the driver's seatafter at least double that. Because the two-liter in the 318d is strangely inhibited in city traffic, does not really get going downstairs and looks rather humorlessly stalled from the middle speed range. The otherwise famous eight-speed automatic also seems confused. She changes gear a little haphazardly, as if she doesn't know what's going on up there in the crankcase.

The BMW 325d GT is fast and economical

In contrast, the 325d is with direct change a little revelation. It packs powerfully into the torque converter right from idle speed, accelerates the heavy GT (factory specification 1,675 kg) so flaky and easy that a BMW M1 from 1978 would have a bit of difficulty in breaking away (325d: 0 to 100 in 6.8 s, M1 in 5.6 s).

In fifth gear from 80 to 120 km /h, the M1 would have no chance against the diesel, and neither would the 318d. In this discipline, the 325 takes almost 3.5 seconds from him. On the other hand, even with this pairing, the consumption advantage of the lower-performance engine is kept within very narrow limits.

The theoretical advantage of the 0.7 liter lower standard consumption was not confirmed by the 318d in the test: Here it is only 0.2 liters less that he consumes, after all, half a liter is it with ams Eco consumption, and the difference on the commuter group is almost in the range of measurement tolerance. Of course, the monthly maintenance of the 325d is a bit more expensive, but without financing costs the difference is so small that it is hardly likely to be decisive in this price range.

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