Re: Twin turbo vs Supercharging LS motors? What's the vibe nowadays?

Originally Posted by
IJ.
Tried this on the Supra, it helped at low speeds but hurt at high speeds.

Originally Posted by
Evman
Can be seen here. The base of the windscreen gets as much pressure as the front of the car. I have no idea what speed this test was done at but I assume 60km/h or so. Also, I have no idea what pressure the areas are. Even the "high pressure" areas could be relatively low for all I know (but I'd assume not, especially at speed)

I think what is happening to IJ's Supra was the issue of pressure difference between under the bonnet and at the base of the windscreen, at low speeds the air pressure in the engine bay was greater than at the base of the windscreen, hence raising the rear edge of the bonnet worked at low speeds. But as the speed got much higher the pressure difference went the other way, the base of the windscreen was higher pressure than the engine bay, hence air wasn't sucked out of the engine bay and there wasn't any cooling benefit.
Cheers, Matthew
I spent most of my money on unreliable cars and less reliable women, the rest I wasted.
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