p@blo
ClioSport Club Member
Clio/A3
Not really, the added extraction of heat by having the bonnet open is offset by the fact the car isn't moving through the air at speed and as such the bay has no extraction effect as it does when the car is moving at speed. Let me put it this way how do you open the bonnet on an engine dyno?
Also when you have an engine package with the exhaust manifold at the rear of the bay with a variety of important and flamable bits like the brake fluid resoirvoir above it it's not a good idea to attempt to keep the heat in!!
FWIW I've ran my Clio on our road bonnet open and bonnet closed. There's no difference at all for a couple of runs.
Cheers Matt, I'm by no means having a pop it just interests me.
I can see how there'd be additional through flow in the sparse bay of a circuit car but would the same be expected in the crowded bay of a typical road going clio? Does the open bay not negate this effect by disproportionately feeding additional aircharge directly to the airbox that wouldn't normally occur?
Out of interest, what kind of neg press shift did you observe & from what speeds would you say it started to have a significant effect on through flow as you describe above? Granted I appreciate this would presumably be to a lesser extent on a typical road car with limited air ingress?
Also totally see your point about an engine dyno RE uninterrupted/raw output, but isn't chassis dyno output meant to give a representation that primitively factors drivetrain/air ingress (as above albeit limited) effects in situ? Appreciate your input to help us lesser mortals understand more about this Matt.
