Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-19-2014, 05:13 AM   #11 (permalink)
Duck duck duck
 
RedDevil's Avatar
 
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 3,508

Red Devil - '11 Honda Insight Elegance
Team Honda
90 day: 53.73 mpg (US)

It - '09 Hyundai I10 Active Cool
Team Hyundai
90 day: 30.77 mpg (US)
Thanks: 1,353
Thanked 1,871 Times in 1,201 Posts
Quote:
Originally Posted by taco View Post
I don't know about the sides being open if that created bad turbulence. I was wondering if it would be better to block it all the way across or if it gets too hot, to block off the outer parts and leave a hole for the center.
I'd say block all except the sides vents...!
They are there by design, deliberately blocking the air flow.
Same principle as the protruding A pillars, between which the front window seems sunken as if set back too far. That too lowers drag, counterintuitively.

As I see it, if you cover them more air will flow along the sides instead of over the car, but the angle around the bumper is too sharp; it will cause extra drag.
The 'scoops' at the sides of the bumper create a high pressure area which pushes the air around the bumper more smoothly.
You want as much air flow over the car as possible. That's where the energy that was put in moving the air away can be gained back by the gentle curve of the roof. The sides don't do that.

__________________
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.14 Gm or 0.09 MM.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-19-2014, 05:45 AM   #12 (permalink)
EcoModding Lurker
 
Vakarian's Avatar
 
Join Date: Nov 2014
Location: New York
Posts: 6
Thanks: 1
Thanked 0 Times in 0 Posts
Block as much as you can, probably entire lower section plus the vents and simply see how it goes. If you're cautious about blocking too much do it piece by piece and test results.
  Reply With Quote
Old 11-19-2014, 01:32 PM   #13 (permalink)
Master EcoModder
 
Join Date: Mar 2008
Location: southern, wv
Posts: 353

Johnny 5 - '81 Honda Cm400e
90 day: 42.86 mpg (US)

Da bike - '06 Honda Shadow Vlx deluxe
90 day: 59.47 mpg (US)
Thanks: 18
Thanked 8 Times in 5 Posts
Quote:
Originally Posted by Frank Lee View Post
Can't hurt. Block the brake vents too unless you're crazy hard on 'em.
i dont understand what you mean by brake vents.
the black pieces under the headlights are blocked and so are the pieces under them.
the center has the slit above the black bar and the center section of the mouth open then a little bit of the piece under the bumper is open. then it has a shield the covers all the underneath to the rear tires.

i got to find some more coroplast and i will completely block it off( center part.)
Quote:
Originally Posted by serialk11r View Post
Off topic, but I'm surprised you're idling at 0.19gph with that Skyactiv engine. My 1ZZ-FE (designed in 1999) is 0.18-0.19gph idle. I would've hoped that with direct injection, high compression ratio, better VVT, and such that they would've been able to cut idle consumption more than 10% (since the displacement is bigger on the Skyactiv).
ill check it when i get to work the eve.
this car is also the pzev if that matters. drops hp from 155 to 154 dont know what else it does.

no heated seats in the i touring, did have fan on 1 out of 4 and the temp set to the middle.
__________________
.

Last edited by taco; 11-19-2014 at 01:38 PM..
  Reply With Quote
The Following User Says Thank You to taco For This Useful Post:
kafer65 (11-19-2014)
Old 11-19-2014, 02:05 PM   #14 (permalink)
Spaced out...
 
spacemanspif's Avatar
 
Join Date: Jul 2013
Location: Dirty Jersey
Posts: 748

The New Focus - '07 Ford Focus ZX5
90 day: 32.44 mpg (US)
Thanks: 142
Thanked 203 Times in 148 Posts
With the slit above the black bar you should be able to completely block the lower grill and still get adequate cooling in the winter.
__________________
-Mike

2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014

Cost to Operate Spreadsheet for "The New Focus"

  Reply With Quote
Old 11-19-2014, 02:28 PM   #15 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,597

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,534
Thanked 3,384 Times in 2,128 Posts
Oh. Since they're already nothing but styling elements, don't mind me.

I blocked the actual vents on my car tho'.
__________________


  Reply With Quote
Old 11-19-2014, 03:21 PM   #16 (permalink)
Tinkerer
 
kafer65's Avatar
 
Join Date: Apr 2008
Location: Tennessee
Posts: 282

Silver - '15 Mazda CX-5 Sport
Team Mazda
90 day: 37.23 mpg (US)
Thanks: 7
Thanked 60 Times in 52 Posts
Thanks for posting Taco. I've got all of my CX-5 blocked except for a 1 inch slit 6 inches wide. My only means of monitoring temp is if the cooling fans come on or not. So far I can't detect any cooling fan activity and I've been running my AC for defogging alot too. We've been in the high twenties low thirties here and my mileage is way down from normal. Right off the highway I'm up to 36.7 from 32 mpg pure city at the beginning of my tank. So far I think I'm bleeding enough heat toward the passenger compartment to have it work but I'll probably need to open it up more to be able to modulate it more.
__________________


Mirror deletes, 80% grill blocks, wheel covers, 50 psi tires = 6% better MPG avg. over a year. Wheel skirts overcoming ethanol winter fuel mpg losses and more!
http://ecomodder.com/forum/showthrea...ead-30641.html
  Reply With Quote
Old 11-19-2014, 03:23 PM   #17 (permalink)
Master EcoModder
 
Sven7's Avatar
 
Join Date: Aug 2011
Location: Warren, MI
Posts: 2,456

Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
Thanks: 782
Thanked 664 Times in 407 Posts
As a general rule, if you're going to only block part of the grille, leave the center open. The reason for this is that if you have the sides open as you have now, you are spoiling clean airflow coming from the very front of the car. It is instead best to pull from the stagnation point and let anything outside of that flow around cleanly.

One notable exception is the Civic EG, whose radiator occupies only the passenger side of the grille opening.
__________________
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
  Reply With Quote
The Following User Says Thank You to Sven7 For This Useful Post:
Daox (11-19-2014)
Old 11-19-2014, 03:31 PM   #18 (permalink)
Tinkerer
 
kafer65's Avatar
 
Join Date: Apr 2008
Location: Tennessee
Posts: 282

Silver - '15 Mazda CX-5 Sport
Team Mazda
90 day: 37.23 mpg (US)
Thanks: 7
Thanked 60 Times in 52 Posts
Here is what mine looks like. Not sure I like it being tilted on the bottom and the sides flare a little on the top and bottom. Not sure this is a very good design for catching air in the stagnation area without disturbing the sides. I'm considering smoothing the brake fill-its too. Taco, do you have any details you would share about getting the mgpguino hooked up in your Skyactive rig?
__________________


Mirror deletes, 80% grill blocks, wheel covers, 50 psi tires = 6% better MPG avg. over a year. Wheel skirts overcoming ethanol winter fuel mpg losses and more!
http://ecomodder.com/forum/showthrea...ead-30641.html

Last edited by kafer65; 11-19-2014 at 05:41 PM.. Reason: add info
  Reply With Quote
Old 11-20-2014, 02:10 AM   #19 (permalink)
EcoModding Newb
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 6,831

Acura TSX - '06 Acura TSX
90 day: 28.07 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 28.08 mpg (US)
Thanks: 2,236
Thanked 2,619 Times in 1,938 Posts
I'll also add that I can do 100% grill blocking on the TSX in city driving without overheating. I'm able to do this by running the climate control. Whenever the HVAC is turned on, it runs 1 cooling fan. This is enough to keep the coolant temps in check.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
The Following User Says Thank You to redpoint5 For This Useful Post:
kafer65 (11-20-2014)
Old 11-20-2014, 03:31 AM   #20 (permalink)
EcoModding Newb
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 6,831

Acura TSX - '06 Acura TSX
90 day: 28.07 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 28.08 mpg (US)
Thanks: 2,236
Thanked 2,619 Times in 1,938 Posts
Double-post

__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com