Thanks, wish this had a spell/grammar checker sometimes

Wish I had a wind tunnel other than the one I'm sitting on. I reckon if a good setup existed in WA you'd dispel quite a few ground effects myths, much like MythBusters did with their ute tailgate tests. Air flow is a bugger of a thing, much like fluid flow characteristics, but more hidden without some fancy gadgets.

Wonder if Curtin has anything for this in a real world dimension?

Too true.

I'm happy to be corrected, but that reverse scoop will do stuff all, other than aid you in getting a yellow sticker.

The theory of the reverse scoop is that with a FMIC it is allowing the air to flow out of the top of the bonnet, ala a sort of reverse setup to a scoop and TMIC. In all reality, air will want to flow underneath the car rather than through the engine bay and out through a small vent in the bonnet. Putting a GX bonnet on will most likely have greater benefits.

As for the design of that one... Well I'm willing to bet it is just 'what looks good' and has had no engineering done to it.

Don't get me wrong, you can design up something correctly to maximise air flow, but the costs associated with that compared to the gains are so minimal. For proof that speed holes in your bonnet can make a difference, look at a WRC car. They optimise everything they can. But then you need to look at the whole picture again

Edit:
Nope

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

Yep, the authorities are NOT over keen on anything that has the potential to splash hot water, oil or other nasties in your field of view at high speeds, can't imagine why.

This is the prime reason for the eternal GC whinge 'the bastards stickered me for removing the vent backings'.

If you ever had the experience of something giving way with open venting on a bonnet you would understand, oh and BTW it never happens while you're just putting down to the shops.


Yeah, the main area of attention for the WRC cars is trapping and diverting hot air from the radiator before it has a chance to flow over the motor.

The environment around the engine is pretty much sealed (take a look at how little air can enter a WRC or ARC car from underneath).

The motor is not a prime culprit in under bonnet temps with subis. The BBQ area around the up-pipe, turbine housing and first half metre of dump pipe are the real culprits. Wraps and coatings can have a good effect on these.

All this aside, in a track situation I still think a design like this (not necessarily this one) might be more effective for a TMIC than anyone realises.

I had the seibon one fitted and my collant temps dropped 10 degrees on an almost permanent basis vs the forward facing scoop.

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Got a pic Polar??

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And the meek shal inheret the earth...If that's okay with you?

I'm not sure if making a low pressure area behind the scoop will be enough to cool air going through the IC.

Correct me if I am wrong, but for a TMIC/FMIC to work effectively, you need good volumes of air going *through* and *out* the fins of the IC - Hence the upgrade to a FMIC from a TMIC.

Would be interesting to see some charge temps using both methods on the same car. Can be easily done - There was a dude on RexNet who did it - Put a sensor through the silicone inlet before the throttle body and some readouts in the cabin.

I wouldn't bother. Just get your existing scoop mounted facing rearwords with a tiny bit of fibreglass work on it. Any bodykit place could do it.

The best area to have the hole in the bonnet to suck hot air out is near the front like on the rally cars. If you try to suck air out of the top mount u will find that that area of the bonnet is not as low pressure as the front.

The reason my coolant temps dropped so much is that instead of a scoop positively pressurising the engine bay and negating the air coming through teh front of the car. I went to a rear facing scoop which allowed air to flow out and created a low pressure area behind teh radiator and intercooler. Suck hot air out rather than blow air into the engine bay is the idea.

In fact, if you have enough air going through forward facing scoops u can cause the airflow through teh radiator and intercooler FMIC to go to almost nothing even at high speed.s

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Thread stealing but ...

I'm after a bonnet vent for my 06, similar to the gc8's, ppl give me hass over the idea but i'm keen. Who could perform such an operation?

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And the meek shal inheret the earth...If that's okay with you?

nice way to butcher a brand new car

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MY93 Impreza GX 1.8L, 0hp, 0nm

That's the hass !!!

Still keen though

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And the meek shal inheret the earth...If that's okay with you?