Size of hood vent

[JulianEdgar]

Originally Posted by eagle

I thought I shouldnt open a new thread that is why I am resurrecting this one

I/C Water Spray Test on Subaru GRB

0:55 onwards

subaru OEM intake scoop seems to reverse its flow (!) to the outside

wasnt subaru aware of that? how can that be?

Interesting!

I don't have an answer to your question but I've measured underhood intercoolers that either have no airflow through them (Peugeot 405 diesel) or reverse airflow (my initial underhood intercooler installation on a Nissan Maxima V6 turbo). The other day I was looking at a current turbo Mazda that has an underhood intercooler and no outside ducting to it at all!

Remember that in most road car applications, the intercooler acts as a heatsink basically as much as it does as a heat exchanger - and as a heatsink, it can transfer air back to the intake air when off boost.

[JulianEdgar]

Incidentally, for those looking through this resurrected thread, there's a fair amount of misleading information in earlier posts.

[gumby79]

Originally Posted by eagle

I thought I shouldnt open a new thread that is why I am resurrecting this one

I/C Water Spray Test on Subaru GRB

0:55 onwards

subaru OEM intake scoop seems to reverse its flow (!) to the outside

wasnt subaru aware of that? how can that be?

Yes they were aware of the interactions of the hoodscoop. On my 06 Forester XT they refuse to install a bug deflector Stone catcher citing that this device changes the Dynamics of the flow over the hood creating too many factory warranty claims from Turbo's overheating and failing due to this disturbance caused by the $250 factory option now(07) only available for naturally aspirated models.