Toyota Yaris Forums - Ultimate Yaris Enthusiast Site
 

 


 
Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Second Generation Toyota Yaris Main Rooms > Fuel Economy Forum
  The Tire Rack

Reply
 
Thread Tools Display Modes
Old 05-26-2009, 01:33 PM   #1
Fluid Motorsports
 
Fluid Motorsports's Avatar
 
Drives: Yaris
Join Date: Nov 2008
Location: Orlando
Posts: 25
Question GI: Underbody Diffuser to help gain MPG

Hello Everyone. First off I want to say that this seems like a very helpful community from what I have browsed so far. Hopefully I can aid in being helpful as well.

I am the owner of Fluid Motorsports.com (.net is someone else) and I mostly cater to the MR2/VW/RX8/Subaru community. I am using my partners SN since its easier this way. I am currently in the process of making front underbody diffuser panels for the MR2 Spyder. However in order for me to buy enough plastic sheets to get the cost at a highly desirable pricepoint, I need to make at least 20 panels. I figured I would try out this forum as well since the Fits are already known for good mpg.

To give you an idea of what I am reffering to please see this this link and pic: http://autospeed.com/cms/A_2456/article.html


The rear diffuser smooths out the air from underneath and provides a smoother exit. As a bonus it also help to add downforce since the air underneath the car is moving at a much more rapid rate than the air on top. A lower car will get better mpg as its having to fight less air.

I myself have a metal skidplate (which doubles as a diffuser as well) in my 250hp AWD Golf R32 and I can now see 30+mpg on the highway on a daily basis. Keep in mind this car is heavy and shaped like a brick. 33mpg was attained in below 32 degree weather! (cold weather is not good for seeing high mpg figures)



So as you can see an underbody diffuser would help greatly. We already have a 2 door Yaris to work on so I can start making measurments. Due to shipping, the panels would come in two halves with a bent joint on each end to make attachment a cake job.

Before possibly becoming a vendor on this forum, I would like to know if there is interest for this. I dont necessarily need 20 people here but on both forums I need a total of 20 people. Price is not set but would be somewhere between 120-140 shipped. All neccesary hardware would be included. I havent decided if 3m tape will do or if screws will be necessary.

If I can get enough interest I will order a batch of sheets and begin making panels to provide pictures. Please let me know what you guys think.
__________________
sales@fluidmotorsports.com
Fluid Motorsports is offline   Reply With Quote
Old 05-26-2009, 03:14 PM   #2
mrbond
 
mrbond's Avatar
 
Drives: 2008 meteorite hatchback
Join Date: Nov 2008
Location: Illinois
Posts: 960
Send a message via AIM to mrbond
Honestly, I'd be interested in this, but only if the end product looks similar in fit/finish to the unit in the link you provided.
__________________
- HOOOEY! That's one tahny little cawr! What the heck kinda toy is that?
- A Toyota Yaris
- A whut Yaris?
mrbond is offline   Reply With Quote
Old 05-26-2009, 04:18 PM   #3
schleppy
I love momentum.
 
schleppy's Avatar
 
Drives: 2009 Yaris LB, Red
Join Date: Feb 2009
Location: Boston, MA
Posts: 587
Send a message via AIM to schleppy
I'd be interested if the plate had an access door for the oil drain plug and filter. I don't want to have to pull the panel everytime I do an oil change.

Thanks!
schleppy is offline   Reply With Quote
Old 05-26-2009, 04:22 PM   #4
kustom play
pink wheels are cool
 
kustom play's Avatar
 
Drives: 07 liftback
Join Date: Oct 2008
Location: Phoenix
Posts: 1,407
how long have you been in business?

ive had an MR2 since 03, and a V-dub for a year and never heard of fluid motorsports

edit:

just checked the site, you dont really have anything listed for the MR2 or VW, looks like you have stuff just for the MR-S
__________________


http://www.4055design.com
kustom play is offline   Reply With Quote
Old 05-26-2009, 05:58 PM   #5
07WYarisRS
HardlyDangerous
 
07WYarisRS's Avatar
 
Drives: 09 Yaris LE, H/B, auto
Join Date: Jul 2006
Location: Ridgeway Ontario
Posts: 573
i understand the smoother air flow but how does more downforce = better mileage?
the way I understood it the more downforce the slower the car. the slower the car the more HP is needed to maintain the same speed.
__________________
The early bird gets the worm, but the second mouse gets the cheese.
07WYarisRS is offline   Reply With Quote
Old 05-27-2009, 07:12 AM   #6
WolfWings
 
WolfWings's Avatar
 
Drives: Silver 2007 3Dr - Gryph
Join Date: Jul 2007
Location: Kansas City, MO, USA
Posts: 310
This actually reduced the front-end downforce to an extent, because there's less for the air to 'catch' on the front-end underside of the car. It just slips past much more smoothly, the improvement is dramatically less turbulence.
__________________
WolfWings is offline   Reply With Quote
Old 05-27-2009, 07:44 AM   #7
scape
 
scape's Avatar
 
Drives: 2007 Yaris Hatchback
Join Date: Jul 2007
Location: Beaufort, South Carolina
Posts: 388
Quote:
Originally Posted by Fluid Motorsports View Post
I figured I would try out this forum as well since the Fits are already known for good mpg.
perhaps i'm being sensitive here, but how ignorant...
scape is offline   Reply With Quote
Old 05-27-2009, 07:45 AM   #8
scape
 
scape's Avatar
 
Drives: 2007 Yaris Hatchback
Join Date: Jul 2007
Location: Beaufort, South Carolina
Posts: 388
with that said, the panels sound like an interesting idea ;D
scape is offline   Reply With Quote
Old 05-27-2009, 10:12 AM   #9
BailOut
Steals terrorist's lunch
 
BailOut's Avatar
 
Drives: 2007 Yaris Liftback
Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
While I appreciate the focus on fuel efficiency this is like just about every other FE mod in that the MPG gains are so small as to be unquantifiable, especially since it only covers a small part of the under body and the Yaris (at least the LB) already has belly pans in the nose.
__________________
- Brian

Share the Road


I often carry 2 carpool passengers and mountain bikes
or snowboards/skis over a 4,500 foot elevation difference.
Click the graphic above to see my detailed mileage logs.
BailOut is offline   Reply With Quote
Old 05-28-2009, 09:29 PM   #10
Fluid Motorsports
 
Fluid Motorsports's Avatar
 
Drives: Yaris
Join Date: Nov 2008
Location: Orlando
Posts: 25
Quote:
Originally Posted by scape View Post
perhaps i'm being sensitive here, but how ignorant...
woops. I had made this post on the Honda Fit forums originally since I plan on making one for them as well. Just change the word Fit to Yaris :P
__________________
sales@fluidmotorsports.com
Fluid Motorsports is offline   Reply With Quote
Old 05-28-2009, 09:52 PM   #11
WolfWings
 
WolfWings's Avatar
 
Drives: Silver 2007 3Dr - Gryph
Join Date: Jul 2007
Location: Kansas City, MO, USA
Posts: 310
Quote:
Originally Posted by BailOut View Post
While I appreciate the focus on fuel efficiency this is like just about every other FE mod in that the MPG gains are so small as to be unquantifiable, especially since it only covers a small part of the under body and the Yaris (at least the LB) already has belly pans in the nose.
Difference is this is one solid, smoothly-curved plastic sheet instead of a half-dozen dozen little blocks that all have gaps between them. And a lot of the Yaris sheets are there more for protecting against road-debris and splashes than trying to keep the airflow as smooth as possible.
__________________
WolfWings is offline   Reply With Quote
Old 05-29-2009, 07:18 AM   #12
voodoo22
 
Drives: Yaris Sedan (auto)
Join Date: Jun 2007
Location: Toronto, Ontario
Posts: 545
It's always interesting to see what people will do to save fuel when all they really have to do is plan their trips, drive speed limit or below and keep their car maintained.

I've driven non stop hwy trips and got 39 mpg on a full tank.

I've driven entire tanks for my mainly hwy commute but with some mixed driving and easily attained over 50 mpg per tank.

Our AT Yaris sedan has zero mods. I use standard oil, filters and regular gas. The only difference between the two types of tanks I described above was the speed I drove at.
voodoo22 is offline   Reply With Quote
Old 05-29-2009, 12:44 PM   #13
tk-421
Super Moderator
 
tk-421's Avatar
 
Drives: 5D-07-LB
Join Date: Jan 2007
Location: Dagobah
Posts: 4,263
I'm interested. How is it different from this underpanel? http://www.yarisworld.com/forums/showthread.php?t=17894
__________________
tk-421 is offline   Reply With Quote
Old 05-29-2009, 01:06 PM   #14
intake
 
intake's Avatar
 
Drives: yaris 2 1.3 mmt
Join Date: Aug 2007
Location: italy
Posts: 62
this increase engine temp, because of hot air flow reduction.

i do not like it.
__________________
Yaris 2007 mmt 1.3 , denso power iridium, pipercross air filter, purplepower 10/40 motor oil + zx1, simoni racing silencer, eibach , henry hausen wheels, modified air box, trd logo,oversized oil filter.
intake is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
My progression into hypermiling BailOut General Yaris / Vitz Discussion 8 10-13-2009 06:31 PM
52.60 mpg Kaotic Lazagna Fuel Economy Forum 42 05-19-2009 01:45 PM
Help me see 55 mpg! Loren Fuel Economy Forum 76 04-02-2009 04:23 PM
Anyone from Missouri? MPG problems inside 4MPG Fuel Economy Forum 31 12-17-2008 05:48 PM
Toyota Yaris MPG Review at www.mpgomatic.com aca72 Fuel Economy Forum 23 10-31-2008 03:59 PM


All times are GMT -4. The time now is 07:19 PM.




YarisWorld
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.