Metro aerodynamics

[MetroMPG]

That's what I meant, yes.

So you're suggesting a 4-7% FE increase, or a 4-7% change in Cd?

[MetroMPG]

Spent a couple more hours on the tray this evening.

[zpiloto]

Originally Posted by MetroMPG

Anyway, the rear portion is in place. The hard part was coming up with a way to extend & taper the control arm surfaces upward toward the bumper and still allow flex in the tray to move with the suspension.

Nice. Don't forget to put the VG's under there

[The Toecutter]

So you're suggesting a 4-7% FE increase, or a 4-7% change in Cd?

Change in FE.

[zpiloto]

I'm going for 5% increase in FE. It will really help the P&G. I'm optimistic when do you think you'll be able to test.

[MetroMPG]

Finished tapering one of the control arms today (15 mins). I'll put in the time to finish it up tomorrow, and since I'm going away mid-end of the week, I'll try to get in some runs before I leave.

I'd be tickled to get +5%. Seems a reasonable estimate.

[MetroMPG]

Here's some info to use for an edumacated guess:

[zpiloto]

That increase would be at a steady state speed. I would think that there would be a better increase in your city driving even though the speeds are realitively slow because of the increase in coasting ability. Althought I think it would be impossible to quantify. Looking foward to your results.

[MetroMPG]

Recorded a couple of runs this evening with the undertray on.

[zpiloto]

Originally Posted by MetroMPG

I'll try to do temperature compensation calcs later, and see what that says, but the other thing I need to consider is that (a) I possibly made things worse by adding the tray, or (b) it didn't help any!

WOW 57 degrees nice I would really be suprised if it did not help there is too much data that say otherwise. Could you tell if the coast down were better? That's one thing that really jumped out at me was how much longer the speed took to bleed off and how much longer the coast was on my usual routes. Like you said need to test the same day. Just run the fireflea through the paces when you get back from your sea adventure. Got any pic's?