Quote:
Originally Posted by JacobLeSann
Hey all,
I’ve been reading, re-reading, and reading some more of Julian Edgar’s book on aero mods. In a couple different pages he mentions raising the height of the trunk lid on a car. I forget the specifics at the moment, but I believe it made for a gentler transition from the rear windshield down to the trunk on notchback-style cars, overruling the increase in wake size. I haven’t seen many people do this, but I have seen it put to great use on the GM/Chevy Volt. I’m planning aero mods for my 2006 Civic Coupe (FG2), which seems to have a separation bubble at the base of the trunk lid; bottom of the windshield. If figure this could be a good remedy.
Anybody try this? I’ve seen it mentioned in various threads but haven’t seen it done much.
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1) if you'll compare the original VOLT concept 'notchback', at Cd 0.42, to the production VOLT 'fastback', at Cd 0.281, it provides an insight into GM's 'solution' for the car's aerodynamic performance.
For some unspecified reason, Chevrolet Division modified the original roofline to fit the 3rd- generation aerodynamic streamlining template. Online, you can find a CFD analysis for the production VOLT, indicating for fully-attached flow until the rear of the roof. Yes, the wake IS larger, but the much-higher base pressure creates an overall pressure drag reduction, and total drag reduction.
2) for your CIVIC, you may want to compare it's roofline to that of the 2022 CIVIC, and see if HONDA hasn't followed the VOLT's lead. And if you can locate a 'blueprint' for both CIVICs, you might want to compare both to the AST-III. There's a reason why the lowest drag cars are using rooflines close to it.