On the MP4/4:
"We didn't set out in our minds to create the lowest possible car. I never tried to fixate on any one parameter like that. Always on my mind was to try to design the best possible car taking into consideration everything you had to work with.
"There were several things that came together with that car, starting with the clutch, really. Tilton had produced a smaller-diameter carbon clutch for 1988 and that meant that the engine people, Honda, were able to produce a lower engine.
"In addition to that, the fuel volume had changed to a 150 liters [40 gallons]. So we could have this small, low engine and we had a small, low fuel tank, so it seemed logical to us at the time to not then sit the driver up tall and proud in front of these low components. Instead, we just laid the driver down to fit within the envelope of the fuel tank and the engine. And, because the engine was so low, we also had to do a new low-line gearbox, so all the components just happened to fit into that low-line package. It looked good to us early on in the wind tunnel.
"A lot of the aerodynamics were carried over from the MP4/3 from 1987. The design philosophy was the same but the car was taller, because we didn't have the low-line components. So we were able to go more extreme on the 4/4, which was really just an evolution of the previous year's car. We had no idea where everybody else was, but it was quite good on lift and drag and it was pretty good on pitch sensitivity as well. But the car had been forced to be longer because for 1988, we had to move the feet behind the front axle, so that increased the wheelbase. But that meant that there was a benefit and further enhanced the stability of the car.
"We had also made the car much stiffer, and it was a wider, bigger, boxier car compared to previous cars which had been narrower because of the ground effects era.
On Prost vs. Senna:
"It was the absolute dream team. They were, at the time, easily the best two drivers in the world in the same team.
"It started off quite well but almost inevitably with two drivers like that who have all the correct characteristics, they don't necessarily make for mates. They were both extremely talented, both extremely competitive and both wanted exactly the same thing. Both were trying to optimize their position, every minute of their lives in and out of the car. So it was inevitable that they were never going to be best mates, but no matter how fierce the competition got between them, the team was always unified.
"And the drivers both – although to the outside world hated each other – had the utmost respect for each and their talents. That's partly what made them great.
"Part of Senna's greatness is due to the competition he had with Prost – and vice versa, of course. Senna did focus on Prost and he used to say to me: 'Let's be honest, it's only Prost, he is the only one I have to worry about.' So they did focus on each other.
"They had the best car that year and they really only had to worry about each other, so it became a match race between the two of them. I thought at the time it was fantastic. A lot of other people thought it was boring because there were only two drivers in it, but what you really had were the two best drivers in the world in a fantastic car – and because of McLaren's attitude they both had identical equipment, so it was a fantastic one-on-one duel.
On turbos vs. normally aspirated cars in 1988:
"There was a lot of competition for third and fourth and the interesting thing is that we were in a transition year in 1988 and we were going to normally aspirated cars for 1989.
"Over the whole duration of the race, the normally aspirated cars actually had more horsepower than we did, the only advantage we had was adjustable boost, so it became a tactical battle, a chess game on the track.
"In order to stay ahead of Thierry Boutsen [Benetton-Ford] and the like, we'd have to go into fuel dip and sometimes we would be five laps behind on the fuel, and finally those guys would give up and we could turn the boost and the revs down again and then try to get the fuel economy down enough that we could finish the race.
"It did put tremendous pressure on our drivers, because they had to take it all out of themselves in those closing stages of the race. They really had to be right on the limit in every corner to eke out the fuel economy and finish the race.
"We had remarkable reliability and the only race where it bit us was in Monza, where Prost had an engine failure and Senna had his famous crash, so neither car finished. Up until then we had remarkable reliability and alongside the fact that we had 15 races where we finished in first, 10 of those races we had one-two finishes.
"So it was really remarkable reliability for the time and was testament to Honda's research and development and also McLaren's attention to detail and preparation."