A new engine formula - exploring new technologies - leaves plenty of room for improvement, and engineers have been given the opportunity to push those boundaries. For Honda, that challenge started in 2015, a year later than the other F1 manufacturers, but Head of F1 Project Yusuke Hasegawa explains that 2017 has been something of a reset.
“It was good for us to do that. We can modify the specification of some of these parts to catch up with the other three engine manufacturers. Last year the engine concept was completely different, so with minor modifications we could not duplicate the same type of performance. That’s why we really needed to change the whole engine concept this year.”
After much work on the dyno, 2017 started with frustrating reliability issues. Completely changing the concept over the winter was a major undertaking and left the team at the Sakura headquarters in Japan with a race against time to be ready for pre-season testing.
“So this year’s power unit was built up at the end of last year. In parallel, we also conducted some mono-cylinder tests and some experimental tests on other engines. However, when we fired up the complete engine for the first time, we could see it wasn't delivering the durability or performance in accordance with our expectations. We also found many minor issues. So we needed to modify tiny bits."
“After resolving these smaller elements, we started to test the full concept at the start of this year - call it Spec Zero as it was the initial one - and before the first winter test we confirmed that it ran on the dyno. But of course at that moment we knew that the power was not delivering to our target. Then, at the Barcelona test, we found more issues on the car, such as the oil tank issue. It was a car-related issue. This is not a complete engine issue, but of course it is very important.”
“Many items we could not test on the dyno, so it is normal that we need to check some functions in the car. The oil tank is one of the biggest items, so we have a rig for the oil tank but we cannot recreate the same types of G forces and conditions as in the car. Of course, by design we have to consider the actual car situation in theory, but sometimes it is not always the same situation so that is why we had some issues with the oil tank first.
“The second issue was down to the vibrations. On the dyno, the model is stiffer and heavier, so it doesn’t create any synchronised vibrations, but on the car - with the gearbox and the tyres - there is a much lower level of inertia. Low inertia does not always create vibrations but it’s completely different from the dyno and that’s why we suffered a huge vibration on the car. Of course, we were aware some level of vibration would come in the car but it was much bigger than we expected.”
“It depends on the items - something like the combustion system takes longer for testing and confirmation. So we cannot set a target just for two weeks later, normally such an upgrade takes something more like half a year.
But it is also important to make those kinds of developments as well, so actually the Spec 3 power unit is like that. This development started in March, more than three months ago.”
The specifications Hasegawa speaks of are the different versions of Internal Combustion Engine (ICE), which have been introduced this season. With Spec Zero starting pre-season testing, Spec 1 was the first version raced in Australia. Spec 2 was then introduced at the Spanish Grand Prix in Spain - where Fernando reached Q3 - and Spec 3 had its first run in Baku before being raced in Austria and taking Stoffel to Q3 for the first time at Silverstone.
Each specification has closed the deficit to the front-runners a little further, and taking a proactive approach means there is no time to wait for the latest upgrade to run before starting on the next development.
In previous years, development was restricted by a token system, which put a value on each power unit component. Each manufacturer was limited in how many tokens they could spend during a season. 2017 has seen that system removed, and with it opened up the opportunity for Honda's Japan HQ in Sakura to push on with this year’s concept.
“If we still had the token system we wouldn’t have been able to change the whole engine modification for this season and also introduce the Spec 2 and Spec 3 power units. I haven’t counted how many tokens it would cost so I don’t know for sure, but maybe it would be difficult to modify and introduce the current Spec 3 engine using last year’s token system.”
With complete component changes - made up of the ICE, turbocharger, MGU-K, MGU-H, control electronics and energy store - being registered by the FIA and anything over four components leading to a grid penalty, it’s all too easy to focus on the headline-making major upgrades. But how often are developments being brought to the track to help close the gap to Honda’s rivals?
“A good example is that last year we changed the induction system from aluminium to carbon. That type of update is easier to introduce, but the core performance has not changed. So when the material changes or something like that, that’s a different type of update.”
Such a modification has knock-on effects on performance by lowering the overall weight of the car or allowing an item to be pushed harder, and it’s the incremental improvements that add up to the gap to the front getting smaller.
“I am definitely confident that we are closing the gap to the leaders so, from that point of view, our speed of development is good. But at the same time it is natural for the follower because you have a target that you know is achievable.”
While work continues on the Spec 4 power unit, development is simultaneously ongoing for 2018, as Hasegawa believes the current concept holds major potential for the coming seasons.
“We don't stop developing, we need to keep updating. Of course the performance and results are the most important things but it’s all learning for the future too. Compared to last year we needed to modify the engine concept, but next year we will keep the same concept.