+Canadian Grand Prix+
#126
Posted 15 June 2011 - 10:57 PM
But that could indeed be a reason why Red Bull can gain so much speed in Q3 compared to other times, perhaps they only use the super map for the 1 or 2 laps in Q3 to protect the exhaust valves?
Also, it seems to be 10% air at the intake, and in the past Renault kept the intake fully open (while not injecting fuel) on overrun to cool the exhaust valves, which is why the ban could not be implemented in Spain, as the Renault engine had not been proven reliable with intake closed to 10%: http://www.jamesalle...-was-suspended/
#127
Posted 15 June 2011 - 11:14 PM
TC is wheel slip based, requiring wheel rotation speed and vehicle speed.Just a guess, but I think to build in true traction control, the ECU needs to be able to monitor wheel rotation speeds. If you eliminate the possibility of that then you've eliminated intelligent traction control.
#128
Posted 15 June 2011 - 11:20 PM
For vehicle speed, is it typically derived from the wheel speeds of the undriven wheels, or perhaps with accelerometers+gyros? Thinking about that, what do they do with 4WD cars?TC is wheel slip based, requiring wheel rotation speed and vehicle speed.
#129
Posted 15 June 2011 - 11:46 PM
I'm not sure. F1 cars use optical measurements, but they ain't cheap. Certainly not cheap enough to throw on your run of the mill Subaru.For vehicle speed, is it typically derived from the wheel speeds of the undriven wheels, or perhaps with accelerometers+gyros? Thinking about that, what do they do with 4WD cars?
#130
Posted 16 June 2011 - 02:52 AM
I'm not sure how they are doing the blown diffuser, in order for the airflow to be effective they need a lot of it, which would use a lot of fuel unless they are running the mixture really lean and retarding the timing a lot. I'll check with some guys I know and see if I can find out some more info on it.
#131
Posted 16 June 2011 - 03:54 AM
AFAIK, it's typically based off acceleration tables. If the acceleration of the wheel speed is outside realistic parameters, the computer determines the wheels are slipping instead of putting power down.For vehicle speed, is it typically derived from the wheel speeds of the undriven wheels, or perhaps with accelerometers+gyros? Thinking about that, what do they do with 4WD cars?
#132
Posted 17 June 2011 - 01:01 AM
#133
Posted 17 June 2011 - 01:12 AM
That way nobody can argue that they NEED a blown diffuser-type system under braking for reliability reasons.
#134
Posted 17 June 2011 - 01:19 AM
Very simple solution the FIA came up with to 'ban' the blown diffusers. Let them blow all the exhaust they want on the overrun or under braking for reliability reasons (a la Renault, using overrun gas to cool exhaust valves), but the new rule will mandate that the exhaust must point up (as they did the years before blown diffusers became popular).
That way nobody can argue that they NEED a blown diffuser-type system under braking for reliability reasons.
...which won't apply until 2012. They'll still allow 10% for Silverstone on.
#135
Posted 17 June 2011 - 04:06 PM
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