Just_a_fan wrote:EricB wrote:On SpeedTV they played a radio transmission with Michael where he was being told to "be careful with applying the throttle and brake too much at the same time or the engine may stall" (or something close to that). Anybody know why this is? Safety reasons possibly, but I'm surprised the threshold is so low that it interferes with driving style?
Apparently the ECU considers a full throttle at the same time as lots of brake force is used as indicative of a problem (e.g. driver hitting the brakes because the throttle is stuck open) and so shuts down the engine.
The FOZ wrote:If true, this is very interesting to me. F1's been with the McLaren SECU for 2 (3?) seasons so far. When it came in, it was universally implemented; everyone had to get used to it at the same time. All the drivers who have debuted in F1 since the SECU came along have known no other way but the SECU. Schumacher, on the other hand, had no experience with the SECU, or it's engine shutdown issue until this season. I believe he's also the only driver with significant driving time pre-SECU to have come back since the SECU has been introduced. Does he use lots of brake under full throttle as part of his driving style? Does not being able to do so now, due to the SECU, explain some of his difficulties? Just speculation at this point, but what does applying large amounts of braking do for the tires at full throttle? Obviously this isn't the only thing at work here, but perhaps this is a missing piece in the puzzle?
I see another aspect to it. If you run a blown diffusor like Merc you want to keep up the exhaust flow as high as possible during cornering. In a very primitive way you can do this by keeping the throttle open and breaking. More advanced applications would play with the engine maps and switch to an alternative map which would retard the ignition and lean the fuel injection.
There is a
thread on this trick which was described by James Allan in his blog. Some people believe that Sebastian Vettel's brake holder failure was related to the simultaneous use of the brakes and throttle as was his spark plug failure related to a map that retarded the ignition too much. I see a pretty good chance that Merc - like all other teams are going through the teething problems of the blown diffusor here.