What bumper/spoiler do you guys rec that has proven downforce? What works?

TIA

 

< http://www.aprperformance.com/index....=226&Itemid=44 >

 

if money is no object j's racing type 2 looks to be the way to go.

 

You mean the Type S

 

yes but they have a "version 2" that is supposed to produce more downforce and costs the same

 

The V1 C-West bumper had wind tunnel numbers published on their SITE.

Units aren't labeled but it went from +13.13 "lift force" units with the OEM bumper at 30 m/s to -11.48 lf units
Even better at 40 m/s +23.65 to -15.10

1 m/s is 2.24 mph so that's 67mph and 90mph respectively.



They never published wind tunnel data for their V2 bumper.

 

You guys think the Replica J's would be much the same as aero as the J's given the design is pretty much dead on?

 

If the shape is the same the aero will be the same assuming it doesn't flex or deform out of shape enough to matter.

Sometimes replicators use different materials to keep costs low, and the stiffness changes quite a bit if they keep the geometry identical and change material. (i.e. unreinforced urethanes vs fiberglass or carbon, or even different types of fiberglass i.e. CSM vs 7781). I've got no idea if this would be an issue for that bumper though--I wouldn't expect it to be.

 

You can also wait for the new Voltex/Evasive Bumper

 

I just dont want to pay $1000 for a bumper that will crack in due time. Why not pay $300 for something that can give you the same down force. Trying to find out if any of this Extreme Dimension stuff is functional.