Johnston wrote:
The Alternator problem was a known one before the season started I believe but Renault didn't sort it and the Red Bull design exasperated the problem I think.
as for the KERS on Marks car Ashley has a very good theory on that. I'll let her explain it herself.
I almost forgot I had a theory! Thanks for the reminder. Also, Adrian said in Austin that Renault has been suffering the same type of alternator failure since testing in 2005.
Back to my theory. Drivers don't use KERS the same way. Not only can you choose where to deploy KERS energy and how much to use, you can also choose the rate at which the energy is harvested from your rear axle, which in turn affects engine braking. We all know the Pirellis aren't very good at doing two things at once - you want to brake AND turn in? No, sorry, choose one or the other.
I think Mark's KERS problems come from using harvesting settings that are outside the happy place for the components, and I think he uses those harvesting rates because it has the desired effect on braking that suits his style. He is always slow in, fast out, while his teammate is fast in, slow out. A greater harvesting rate and more "abrupt" input to the tires could also explain why Mark seems to use up his tires sooner in that first stint that in teammate, almost all the time. Further, whenever Mark loses KERS his performance seems MORE affected than anyone else who loses it. He gets MUCH slower, which to me indicates he's losing performance not just from the lack of the power boost, but also the help under braking.
He also never seems surprised or makes a big stink about the KERS failures, which makes me think they understand why its happening (if I can come up with this they certainly can) and have decided that the benefits of using it in that manner outweigh the potential failures.
I've also read a lot about the possibility that RBR uses a sort of two stage KERS system - where they store some energy in battery packs like the rest of the teams, and some in supercaps. The difference being that the supercaps can deliver the energy more quickly than the battery packs, but that the battery packs hold the energy for longer and can deliver it more smoothly. What I don't know is how that kind of setup would influence harvesting, but I imagine it could magnify the problem for Mark.