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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-18-2015, 10:57 AM   #1 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,546

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
Thanks: 3,309
Thanked 6,119 Times in 3,175 Posts
7 aeromods + tire pressure = 11.6% gain at 90 kph (56 mph): 2015 Nissan Micra 5-spd



Nissan sells the Micra in about 160 countries, and Canada joined the list for 2015. The US doesn't have it, but the Canadian version shares the same drivetrain & platform as the Versa Note & sedan (perennial best-selling subcompact in the States), so you've "seen" plenty of Micras whether you realize it or not.

One Micra owner said: "I tell people it's a Versa Note with a funky/retro body kit."

Basic stats (5-speed manual transmission):
  • City: 8.6 L/100 km city / 27.4 MPG (US)
  • Highway: 6.6 / 36
  • Combined: 7.8 / 30.6
Drag coefficient: 0.315

Nissan loaned me one recently, possibly not expecting that I would duct tape coroplast and cardboard all over it for fun & edutainment.

Here it is stock:



The mods...

1. Tire pressure

Placard pressures are 33 front & rear. Super squishy comfy! I went to sidewall max (44) +1. And I prefer the overall feel at that level, personally.


2. Partial grille block

The Micra has a huge amount of open grille area for a little 109 hp car:



The diagonal lines show where the radiator is. Everywhere orange is wide open.

Considering this is the base Micra with manual trans and no A/C, its cooling requirements are bottom of the scale. There's absolutely no need for this much flow-through in normal conditions.

Solution: cut-out coroplast shapes, wire ties...



In this configuration, the cooling fan didn't come on once during a 440 km / 275 mile highway round trip (cruising between 80 kph / 50 mph to 105 kph / 65 mph, including city traffic with some slow & crawl and many stop lights. The max coolant temp was 197 F; the cooling fan turns on at 207 F; ambient temp was around 75-80 F.

Interestingly, the Versa Note, which has the exact same 109 hp engine/trans (manual, but not the automatic) has blocked off "faux grille" sections, plus it uses active shutters in the lower portion in the CVT version.

Another thing the Versa Note gets that the Micra doesn't is a stock air dam, so...

3. Air dam



It's lawn edging. Clearance is about 10 cm / 4 inches. It scraped occasionally, but only on very steep transitions.'

It was fun coming up with a rigid attachment without drilling anything! I re-purposed a bunch of existing holes underneath, plus liberal amounts of Gorilla tape.

Here's the Versa Note's front end for comparison. Also notice the blocked "faux grille" sections that the Micra didn't get?



4. Kammback

The base Micra doesn't get any treatment on the hatchback, though the top trim "sport" Micra SR gets what the company calls a spoiler, which looks to me like a (small) drag-reducing roof extension:



But bigger is better in the Kammback department:



5. Smooth wheel covers



I reused the discs I had made & tested on the '07 Honda Civic winter beater. Except these were just duct taped on the OEM wheelcovers.

They don't necessarily have to be ugly -- I shopped spun discs onto one owner's lowered Micra and think it looks great:




6. Rear fender skirts



They're just cardboard with plastic over top. It's a simple flat piece -- the size & shape was dictated by tire protrusion from the wheel arch.


7. Rear tire spats/deflectors



I'll admit size & placement was a bit of a guess. Both the Versa sedan (pictured, right) and Versa Note have 'em.


8. Passenger mirror delete



(Replacement interior convex mirror pic borrowed from another EM thread.)

A-B testing & results -- next post.

Attached Thumbnails
Click image for larger version

Name:	8-mods-collage.jpg
Views:	1275
Size:	74.7 KB
ID:	18020   Click image for larger version

Name:	micra-tallships-2up.jpg
Views:	261
Size:	47.7 KB
ID:	18022   Click image for larger version

Name:	grille-block.jpg
Views:	303
Size:	45.7 KB
ID:	18024   Click image for larger version

Name:	air-dam.jpg
Views:	222
Size:	19.4 KB
ID:	18025   Click image for larger version

Name:	versa-note-front.jpg
Views:	308
Size:	45.0 KB
ID:	18026  

Click image for larger version

Name:	sr-rear-spoiler.jpg
Views:	222
Size:	23.7 KB
ID:	18027   Click image for larger version

Name:	kammback-2up.jpg
Views:	222
Size:	43.8 KB
ID:	18028   Click image for larger version

Name:	micra-moon-discs.jpg
Views:	301
Size:	64.0 KB
ID:	18031   Click image for larger version

Name:	micra-rear-skirt.jpg
Views:	217
Size:	36.6 KB
ID:	18032   Click image for larger version

Name:	rear-tire-spat.jpg
Views:	215
Size:	21.7 KB
ID:	18033  

__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
The Following 6 Users Say Thank You to MetroMPG For This Useful Post:
aerohead (06-18-2015), BabyDiesel (06-18-2015), BamZipPow (06-18-2015), Daox (06-18-2015), Insight for life (06-18-2015), jedi_sol (06-18-2015)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-18-2015, 10:58 AM   #2 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,546

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
Thanks: 3,309
Thanked 6,119 Times in 3,175 Posts
A-B testing and results...




Conditions:

Temp 16 C / 61 F
Wind NE 13 km/h / 8 mph
Pressure 102.4 kPa
Humidity 42%

Test route:

Flat 2-lane highway; no traffic in my lane; occasional oncoming traffic; ~80% of the distance in a forested area (sheltered from NE breeze).



Results:

52.5 mpg (US) = 4.5 L/100 km = average, all A runs

47.0 mpg = 5.0 L/100 km = average, all B runs

11.6% / 5.5 mpg US improvement, A over B

------

I'd call that a healthy success. Some of these mods could be re-done and made to look OEM, too.

------

Raw numbers:

Code:
A (mods in place)

North ... South ... Average (MPG U.S.)
53.2 ... 52.3 ... 52.8
53.1 ... 51.6 ... 52.4
52.6 ... 52.4 ... 52.5
53.5 ... 51.2 ... 52.4

B (all mods removed/reversed)

North ... South ... Average (MPG U.S.)
46.4 ... 46.9 ... 46.7
47.3 ... 47.0 ... 47.2
48.2 ... 46.0 ... 47.1
48.1 ... 46.4 ... 47.3

STDEV all A runs: 0.5
STDEV all B runs: 0.7
Attached Thumbnails
Click image for larger version

Name:	micra-modded-full-shots.jpg
Views:	286
Size:	110.1 KB
ID:	18036   Click image for larger version

Name:	graph-results-mpg-us.jpg
Views:	288
Size:	47.7 KB
ID:	18038  
__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
The Following 6 Users Say Thank You to MetroMPG For This Useful Post:
BabyDiesel (06-18-2015), BamZipPow (06-18-2015), Daox (06-18-2015), jedi_sol (06-18-2015), RedDevil (06-18-2015), redneck (06-18-2015)
Old 06-18-2015, 12:55 PM   #3 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,191
Thanks: 179
Thanked 1,521 Times in 1,122 Posts
MetroMPG, you sending NISSAN an e-mail with a link back to this posting?
  Reply With Quote
Old 06-18-2015, 02:02 PM   #4 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,546

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
Thanks: 3,309
Thanked 6,119 Times in 3,175 Posts
If I did, I have a feeling this would be the last loaner I'd get from them!
__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 06-18-2015, 02:07 PM   #5 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,107

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,431
Thanked 2,482 Times in 1,496 Posts
I'd say thats a great success.
__________________
Current project: A better alternator delete
  Reply With Quote
Old 06-18-2015, 02:12 PM   #6 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 3,817

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,570
Thanked 1,722 Times in 1,109 Posts
... Or your next loaner could come with a check for the consultation. Either way, we'd all learn something about Nissan!
__________________

Quote:
Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

  Reply With Quote
Old 06-18-2015, 02:21 PM   #7 (permalink)
Master EcoModder
 
redneck's Avatar
 
Join Date: Jun 2009
Location: SC Lowcountry
Posts: 1,325

Geo XL1 - '94 Geo Metro
Team Metro
Boat tails and more mods
90 day: 72.22 mpg (US)

Big, Bad & Flat - '01 Dodge Ram 3500 SLT
Team Cummins
90 day: 21.13 mpg (US)
Thanks: 178
Thanked 1,098 Times in 526 Posts
.

Awesome...

Nearly 12%...


I say show it to Nissan.




>
  Reply With Quote
Old 06-18-2015, 02:52 PM   #8 (permalink)
Furry Furfag
 
Baltothewolf's Avatar
 
Join Date: Nov 2013
Location: Apple Valley
Posts: 2,084

Winsight - '00 Honda Insight
90 day: 56.69 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 28.53 mpg (US)
Thanks: 67
Thanked 406 Times in 311 Posts
Yea I would show them the Kam-back, grill block and rear tire deflectors. The skirts wouldn't stick, as companies don't want to lose sales because of looks, but even without the skirts/wheel covers it's probably still a 7-9% increase.
__________________

  Reply With Quote
Old 06-18-2015, 03:15 PM   #9 (permalink)
EcoModding Lurker
 
Join Date: Dec 2014
Location: North East Pennsylvania
Posts: 59

Hatch - '86 Honda Civic DX
90 day: 50.81 mpg (US)

Lego - '99 Subaru Legacy wagon Outback limited
90 day: 26.46 mpg (US)

Sedan - '92 Honda Civic Lx
Team Honda
90 day: 59.43 mpg (US)

FIT - '07 Honda Fit Sport
90 day: 51.8 mpg (US)
Thanks: 116
Thanked 7 Times in 7 Posts
Very cool
__________________
  Reply With Quote
Old 06-18-2015, 04:52 PM   #10 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 11,224
Thanks: 17,991
Thanked 5,974 Times in 3,631 Posts
mods

If you're going to persist in this type of behavior young man,we're going to insist that when in public,that you maintain the proper attire: Einstein hair wig,white lab coat,pocket protector with slide rule,and 1-inch thick horned-rim glasses!
Nice going.You just saved Nissan's R&D Dept. a couple million $$$$$$$$$$$$$$$
We'll look forward to these 'OEM' items in 2025.

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following 4 Users Say Thank You to aerohead For This Useful Post:
BamZipPow (06-18-2015), gone-ot (06-18-2015), MetroMPG (06-18-2015), Mustang Dave (06-18-2015)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com