I basically just wanted to know how much does not having and underpanel affect you at the track.

Anyone tested this?

How much mph would you gain with the addition of a beatrush or even stock underpanel vs none?

Just wanted to know because I have been running without one for a while and wanted to see how much it was slowing me down.

Thanks

 

I don't run one either.. Although I don't feel my mph is fast enough to see a big disadvantage.

 

This would be a very interesting study if one could be performed correctly.

 

Portions of this thread might be useful: https://www.evolutionm.net/forums/sh...d.php?t=381904

The implication for trap speed on the strip may be about rear diffuser more than any front underpanel.

 

I think though that when you're in the 100+ range the aerodynamics tend to get affected. Which is why they say that vortex generators are good for those mph's and above.

i remember the review on the beatrush underpanel and they said that at the track they saw an increase of 15mph in the straights. Although I'm pretty sure that's combined from the whole track and not just one straight.

A test would be good to see just how beneficial it really is.

 

i think someone on this forum had mentioned something about a 'parachute' effect of the rear USDM bumper which makes sense short of because of the design...

if air passes under the car the air can be trapped under the rear bumper thus maybe braking the car... MAybe? thats theory but it would be cool of someone could actually test it....

 

this is an interesting topic for me, I have my eyes on the Buschur rear underpanel.... but I'm a little nervous about installing it.

 

I would love to see this tested

 

Maybe the British figured this out and thus they built the JDM rear bumper which sits higher, most likely creating less of a stopping factor.

 

I'm pretty sure a lot of people would, we just gotta find someone who is willing to take the underpanel on and off for testing. Or maybe a vendor who from the good results this test might bring, be beneficial to them.{thumbup**

 

An easy and most cost effective way to relieve this "parachute" effect the USDM rear bumper presumably causes would be to cut two air ducts. One on each side to allow the once trapped air to flow right through. I'm sure this could be done in a very cosmetically pleasing way as well.

 

How would this be done just two holes straight in the back?

Also I would think the whole from the exhaust already relieves some of this pressure, but of course the air would have to go around the exhaust still causing inefficiency.

 

This is a very crude attempt at a photoshop but will most certainly illustrate what I am explaining.

 

You would have to understand the airflow dynamics in order to understand how large of a hole and at what locations would best alleviate the amount, force, and dynamics of the incoming air.

A very simplistic example is putting a pinhole in a styrofoam cup when it's being filled from a garden hose...

 

Thats not bad at actually. But then how much more beneficial is the JDM rear bumper with a diffuser, how does it displace the air that is coming trough to the back downwards so it doesn't get stuck in the back of the bumper.