When I first drove the car I was massively struggling with locking the rears and rear stability among other things. We worked bloody hard in the last two months to try and resolve the issues....
...you can't hit the brakes hard. You have to be careful and you start adjusting the brake bias to the front and then you start locking up the fronts. Then you end up having both at the same time.
The areas are the unstable rear end under braking and a basic lack of downforce compared to Ferrari and McLaren, people like that, and BMW and Renault definitely.... a lot of it is the aero of the car. Under braking we are struggling with stability, which means you lose out in confidence because you can't brake where you want to.
At the start of the lap I was getting understeer because the tyres were not up to temperature, then later in the lap I was getting oversteer as the rears were going off, which just shows the issues that we have.
I had a problem right from the start with the car bottoming out much more than it has been at any other point over the weekend.
if the front tires are too cold and the rear tires are blistering too fast and you have braking instability and bottoming out while still in a straight line on a bumpy track and not at turn in trail braking, then your problem with a longer wheelbase is one of :
http://www2.ee.ic.ac.uk/cap/publication ... lt_pap.pdf
pitch angular inertia
center of gravity location (as it relates to the distance to the axle)
spring rate of tire itself
suspension damping coefficient
Honda with the longer wheelbase hasn't figured out the effect of the sidewall construction spring rate effect of these new Bridgestones and put in countermeasures for them at the damper systems or hasn't sorted out the pit angular inertia behaviour of their car.
Rear braking lock up is brake bias related. They're using too much rear bias to fix a bad handling problem and its costing them straightline braking stability.
They have a lot of work to sort out systematically at Malaysia with finding what the root cause of this is and then getting that fixed before they then sort out the aero and braking problem integration. Hopefully the new rear suspension geometry/damping will fix the problem.