Aero mods to VT Commodore (with pics) - Page 4 - Fuel Economy, Hypermiling, EcoModding News and Forum

nitro-nige · 01-12-2011, 05:46 PM

Have you considered using a V8 supercar front bar/spoiler?
It could easily form the start for a belly pan.

I've spend a lot of time comparing VT/VX to VY/VZ commodores when I see them at the lights or on the free way. Those rounded edges on the back of the VT look better but are probably creating more turbulence.
Also interesting (and I see this on a lot of later model cars) is the 'fake diffuser'

I''d love to get one and open it up and make a proper diffuser and see the difference.

lunarhighway · 01-14-2011, 03:27 AM

Quote:

I''d love to get one and open it up and make a proper diffuser and see the difference.

the problem with diffusers is they're maximum angle is rather small, so changes are you don't need to open up the "diffuser" but you'll just end up underneath it... this "diffuser" looks rather couter productive as well as it basically seems to create a round edge... and as most of us know... that's bad, you want a sharp edge.

also the bumper likely covers a lot of stuff like the spare wheel tub and exhoust components and whatnot

nitro-nige · 01-14-2011, 06:18 AM

What I was referring to is the black section in the rear bar, that makes the shape of a diffuser outlet but isn't one. I take your point that there is a fair bit of stuff there (spare wheel etc), but isn't that just a creative packaging challenge?
This design of rear bar seems to be 'in fashion' at the moment.
My understanding (limited) of diffusers is gradual increase in cross sectional area and sharp edge on the exit.

galahs · 01-15-2011, 01:40 AM

Its a shame the monaro boot lid doesn't fit on the VT / VX sedans. Its sharper rear lip would surely reduce drag by promoting a cleaner seperation.

If only an aftermarket company made a bolt on lip of a similar profile designed to reduce drag, not like currently available lips that are designed to increase downforce.