A few of us BMW Club Malaysia forumers (not all are members!) took our German rides out yesterday for a group dyno session at GT Auto. A dyno (short for dynamometer) is basically a machine that can measure your car’s horsepower and torque output at the wheels.
Horsepower and torque at the wheels is always less than what the manufacturer quotes for the engine as once the power passes through the gearbox, axle, wheels and tyres, there are some power lost there – this is usually 10 to 15% for a manual transmission and 20 to 25% for an automatic transmission.
The dyno results all revealed some pretty interesting results, but what’s post-worthy here is that there were a few Malaysian spec 177 rated horsepower BMW 320d that attended the dyno, and they’ve agreed for me to share the results.
docrayboy’s 320d did a peak horsepower of 163.15 PS and 373.37Nm of torque. 163.15 PS is actually quite comparable to some of the standard automatic 328i E36s that dynoed on that day – more than enough power for a brisk drive. zhul’s 320d did similiar numbers – 159.7 PS and 37.86 kg-m (around 371Nm).
I think it’s really interesting that even after transmission and other losses, peak torque figures exceed the BMW peak torque rating of 350Nm. Wheel horsepower of about 160+ PS also exceeds the 177 horsepower rating if you add another 15% to 20% (about 184 PS to 192 PS), assuming an auto transmission with lock up clutch engaged.
It looks like BMW has underrated the 320d engine and it actually makes more power than the specs sheets suggest. But what I was actually curious about is that whether our market’s 320d will have a drop in power output compared to the spec sheets because of Euro 2 diesel quality. Looks like we’re getting at least what we signed up for.
Thanks to zhul and docrayboy for sharing their dyno charts!