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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-02-2015, 07:04 PM   #11 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 13,270
Thanks: 21,199
Thanked 6,437 Times in 4,013 Posts
pressurizes?

Yep,the diffuser is like a two-dimensional diverging nozzle,where the fluid (air) is decelerated,building back static pressure as it travels,such that it imparts this higher pressure to the wake,raising its base pressure,and lowering the pressure drag (largest component of a vehicles drag).

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following 2 Users Say Thank You to aerohead For This Useful Post:
freebeard (03-02-2015), nemo (03-07-2015)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-07-2015, 07:22 AM   #12 (permalink)
EcoModding Lurker
 
Join Date: Feb 2015
Location: uk- new milton
Posts: 18
Thanks: 1
Thanked 9 Times in 8 Posts
Thank you - good answer!
I am going to try and make a fastback for it. rear diffuser is certainly on the list as well.
  Reply With Quote
Old 04-05-2015, 05:47 PM   #13 (permalink)
EcoModding Lurker
 
Join Date: Feb 2015
Location: uk- new milton
Posts: 18
Thanks: 1
Thanked 9 Times in 8 Posts
there are 3 bars going across the underside of the car, so I am shortly to do a simple flat bottom mod.

I have a rear wing on now and have a part finished front splitter. I still need to modify the height of the air dam as there is a gap between the top of the air dam and the bottom of the bumper.

I am yet to do a test run without the new mods on (I have changed wheel size, so this throws out my previous drag recordings) - I must do a few more runs keeping the mods on then take them off and see the difference, the car feels better with the smaller wheels and the mods. My thoughts are that the rear wing is helping organise the rear air flow (when I say organise, I mean in the same way as end plates on a wing 'organise' air flow). Only the results will tell me if these things work.. but just a wordy update to let you know I am still here.
  Reply With Quote
The Following User Says Thank You to jondoeclsm For This Useful Post:
aerohead (04-06-2015)
Old 04-05-2015, 11:28 PM   #14 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 660 Times in 475 Posts
am I missing the pictures!!!!!?????
__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
  Reply With Quote
Old 04-06-2015, 06:14 PM   #15 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 13,270
Thanks: 21,199
Thanked 6,437 Times in 4,013 Posts
gap between

Quote:
Originally Posted by jondoeclsm View Post
there are 3 bars going across the underside of the car, so I am shortly to do a simple flat bottom mod.

I have a rear wing on now and have a part finished front splitter. I still need to modify the height of the air dam as there is a gap between the top of the air dam and the bottom of the bumper.

I am yet to do a test run without the new mods on (I have changed wheel size, so this throws out my previous drag recordings) - I must do a few more runs keeping the mods on then take them off and see the difference, the car feels better with the smaller wheels and the mods. My thoughts are that the rear wing is helping organise the rear air flow (when I say organise, I mean in the same way as end plates on a wing 'organise' air flow). Only the results will tell me if these things work.. but just a wordy update to let you know I am still here.
The airdam will be most effective if there is zero gap between it and the bumper bottom.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 04-07-2015, 12:55 PM   #16 (permalink)
EcoModding Lurker
 
Join Date: Feb 2015
Location: uk- new milton
Posts: 18
Thanks: 1
Thanked 9 Times in 8 Posts
Sorry not got pictures up yet.
  Reply With Quote
Old 04-07-2015, 01:16 PM   #17 (permalink)
EcoModding Lurker
 
Join Date: Feb 2015
Location: uk- new milton
Posts: 18
Thanks: 1
Thanked 9 Times in 8 Posts
Trying a side view of the actual car..

Attached Thumbnails
Click image for larger version

Name:	rsz_20150310_121622.jpg
Views:	98
Size:	93.7 KB
ID:	17293  
  Reply With Quote
The Following User Says Thank You to jondoeclsm For This Useful Post:
aerohead (04-08-2015)
Old 04-17-2015, 05:24 PM   #18 (permalink)
EcoModding Lurker
 
Join Date: Feb 2015
Location: uk- new milton
Posts: 18
Thanks: 1
Thanked 9 Times in 8 Posts
Ok, so after several runs on the new small wheels monitoring full accelleration from 4.5k revs to 6k revs with and without the rear wing and the front splitter on, the difference in this area is that:
it does this in 3rd in around 4.5 seconds and with the wing and front splitter it is on average 1/5th second quicker.

So if I have gained some downforce then great, it comes with a marginal difference in drag.
  Reply With Quote
The Following User Says Thank You to jondoeclsm For This Useful Post:
aerohead (04-17-2015)
Old 05-21-2015, 05:43 PM   #19 (permalink)
EcoModding Lurker
 
Join Date: Feb 2015
Location: uk- new milton
Posts: 18
Thanks: 1
Thanked 9 Times in 8 Posts
I was removing the old shocks on the rear today and had to make a small hole in the rear of the wheel arch in the boot space.. this got me thinking, would the rear wheels benefit from venting them inside the boot space and letting that air out of the vertical rear which is the boot?

My thoughts are that it may be beneficial as the very low pressure at the rear could be 'fed' from the wheel arches.

Also a lot of race cars now use vents rear of the front wheels, this would be a vent at the rear of the rear wheels.
  Reply With Quote
Old 05-21-2015, 05:49 PM   #20 (permalink)
EcoModding Lurker
 
Join Date: Feb 2015
Location: uk- new milton
Posts: 18
Thanks: 1
Thanked 9 Times in 8 Posts
Oh yes, and I managed to bridge the gap between the air dam and bumper by using the hard plastic strip used for worktop trim, 40mm high, attached by the non removable 'Tiger Seal' which I managed to use without getting on my fingers for the first time today.

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com