sosic2121 wrote: ↑24 May 2019, 00:35
In the end, it's all about rules. If rules allowed, every team would use new engine every race. It's same with fuel.
And one more question, why are new cars so much heavier than they used to be?
So if consider power density, these PUs are probably the worst ones since... I don't know when.
As you say - rules. The rules state various minimum weights. Partly this down to safety - added impact protection etc adds weight. Partly it's to reduce spending on developing ever lighter engine components etc. Then there is the extra kit in the cars - battery, MGU x 2, control systems, cooling systems for these extra bits, etc.
As for power density, the current engines put out 800+bhp in the race. The old turbos didn't get anywhere near that in the race. They were about 650bhp and weighed 540kg empty - so about 120kg less than the current cars. 800/740 = 1.08 bhp/kg, 650/540 = 1.2bhp/kg, both without fuel and driver. Of course, part of that extra weight is the ERS which gives the cars approaching an effective 1000bhp. Say 950bhp. 950/740 = 1.28bhp/kg. So actually the current cars have better power density than the old turbo cars did in race trim. And they do it for 5 whole events per engine rather than 5 engines per event.
If you are more fortunate than others, build a larger table not a taller fence.