f1. no ecu engine braking?

Not knowing the specifics but I'd *guess* that because the engine has such a small amount of inertia engine breaking is minimal, therefore in the past the ECU would carefully ramp down the revs to give a braking effect
 
How would it reduce the revs though? Surely on the over run, the revs of the engine is dictated by the wheels turning, there's either engine braking effect by the resistance of the engine, or there isn't..
 
andi said:
How would it reduce the revs though? Surely on the over run, the revs of the engine is dictated by the wheels turning, there's either engine braking effect by the resistance of the engine, or there isn't..
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You could create resistance by controlling the revs the engine wants to run at vs the revs that the wheels are forcing it to run at
 
How do you control the revs though? On the overrun, assuming its as a road car, there's no fuel, so no combustion, the thing making the engine turn is the wheels going round.
 
andi said:
How do you control the revs though? On the overrun, assuming its as a road car, there's no fuel, so no combustion, the thing making the engine turn is the wheels going round.
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F1 cars aren't exactly road cars though. On the overrun in an F1 car the ECU would still be controlling fuel and throttle opening to prevent locking of the rear wheels and maintain the car in a stable condition.
 
Alibaba99 said:
F1 cars aren't exactly road cars though. On the overrun in an F1 car the ECU would still be controlling fuel and throttle opening to prevent locking of the rear wheels and maintain the car in a stable condition.
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I see what you mean, and I understand how you could use that to decrease engine braking, but how does the ecu increase it?
 
andi said:
How do you mean? Brake the wheels? Not really engine braking then though is it..
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In your road car example you cut the fuel and the wheels turn the engine. In this situation you slow because the wheels are basically operating an air compressor with some quite heavy reciprocating parts. In an F1 car the same compressing effect remains but because the engine parts are so light the engine braking effect is small compared to that of the brakes. If however you allow the ECU to make the final call on the amount to fuel (not the throttle pedal!) you could create a situation where the wheels had a much harder time compressing the air ;)
 
but there race engines running high compression so engine braking effect will be high....also with the mix of phnematic valves the engine "could" be turned into a very good brake.

bullit
 
on the over run the ecu controls the fuel by stopping it all together

engine braking is the 'pumping loses' caused by the pistons sucking against a closed throttle
 
andi said:
How do you mean? Brake the wheels? Not really engine braking then though is it..
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No. Not braking the wheels.

With a tightly-meshed drivetrain and clutchless downshifts, the wheels can lock whilst going down through the gears. The ECU VERY carefully controls throttle and fuelling to prevent this and it also does so to create engine braking by MAKING the egine (even on 'over run') spin at a set rpm.

*n
 
The problem with the engine braking was they were using it as a rudimentary ABS system.

I believe engine braking still occurs, but the ECU's can no longer open the taps a bit if the rear wheels start to lock.
 
Matt82 said:
must be pretty hard having to learn throttle control after years of just pinning it and relying on dsc
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You dont mention which drivers but they've all driven cars without TC.. they arnt having to "learn" throttle control, they should already have it, or had it at some point.
 
bullit in head said:
but there race engines running high compression so engine braking effect will be high....also with the mix of phnematic valves the engine "could" be turned into a very good brake.
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If the valves are electronically controlled, You can create quite a degree of resistance just using the air alone if you have full control over inlet/outlet valves..

I doubt they would want any fuel when over running, it's precious stuff!..
 
didnt you watch top gear when hammond was in the renault car?

It takes no less skill imo to drive an f1 car as fast last year as it does this year.
 
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