Delta Wing Vortex Generators

[JanGeo]

The idea of the VGs is to create a swirl of air that ends up behind the vehicle reducing the low pressure behind it thus reducing the drag. So for your side VGs you need to look at the resulting swirl and add more if it doesn't do the job. I think that double fins on each like the airtabs may also increase their effect ... The idea is to kick the air up away from the body laminar air flow as smoothly as possible and have it return behind the vehicle. Having a Scion xB really has me thinking about installing some but the return on investment is questionable and the potential winter conditions here may damage them increasing the cost. I may try to 3D print some if it could create the proper shape with the cad drawing programs I have.

[boof777]

I'm glad I didn't pay money for them. Yes the AirTabs will probably be better but not convinced about these used as a MOD to solely give you better FE. Mine hasn't changed but the extra stability at speeds above 60mph has been great. More stable the faster you go, well up to 75mph is all I got to here.

The problem I have with the side VGs is the turbulence created by the large side mirrors and snorkel on right side. The air is turbulent all the way to the rear so the VGs on the D pillar are doing nothing really.

Anyway, for stability they work well. For FE, not convinced.

[JanGeo]

Sounds like you need to put a tail on the snorkel to reduce the turbulence!

[boof777]

Will look at doing something with the snorkel. The wind noise is annoying as well since its on the drivers side A pillar :-(

Was measuring up for a partial kammback/kammback spoiler last night too :-)

About 480mm long off the roof would work well as it would be level with the rearmost part of the car (rear edge of read bumper). Worked out measurements for the sides as well.

I can also make some fairings around the front end as well. These will help the air flow better but without any increase to frontal area or compromising off road clearance.

Was looking at some ideas BMW use in their vehicles. Air curtain etc etc

This stuff is pretty interesting :-)

[trollbait]

Would a spiral wrap, like on the radio antenna, help on the snorkel?

[JanGeo]

Teardrop shape it the most aerodynamic so making it round on the leading edge and just a taper on the trailing is best, it should look like a symetrical wing going vertically.