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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-25-2014, 07:16 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Jul 2013
Location: Spring, TX (Houston area)
Posts: 24

The Blazer - '00 Chevy Blazer LT
90 day: 16.31 mpg (US)
Thanks: 3
Thanked 1 Time in 1 Post
Lowered rear 2" now getting worse gas mileage

Well, I guess I kind of brought this upon myself...

I've got a chevy blazer that sits like a truck. When it's stock, the rear end sits 1" higher than the front. I found 2" lowering blocks and installed them only on the rear and it looks pretty level, but when I'm driving it, now my engine is having to work harder. I was getting 17.6-18.4 mpg per tank and now i'm down to 16.5 and 16.9 on my past two tanks. I dropped it with the intent of having it look more level (it's level when I'm sitting in it).

The thought came into my mind that I need to grab some coroplast and smooth out the bottom of the car, because it feels that air is grabbing the underside of the bumper and dragging. What do you think, ecomodders? Return it to stock height? find 1" blocks? make a belly pan for the rear end (is that a butt pan? :P). Feedback is wonderful!

__________________
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-25-2014, 07:25 PM   #2 (permalink)
EcoModding Apprentice
 
iveyjh's Avatar
 
Join Date: Apr 2011
Location: Canyon Lake, Texas
Posts: 222

none - '98 Honda Civic HX

none - '00 Chevy (Geo) Metro base

none - '00 Saturn SL1 base
Thanks: 126
Thanked 77 Times in 50 Posts
Lower the front as much as you did the rear and install air dam/splitter. That ought to get your gas mileage back plus a few more. If you install belly pan you can leave the air dam off, but the air dam is a lot easier and cheaper and the gain is pretty much the same. Happy modding
  Reply With Quote
Old 03-25-2014, 07:35 PM   #3 (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 659 Times in 474 Posts
there are some discussions about the 'angle' of the front end...ie the direction it points down at the nose.

I improved my mpg on the 2002 Infiniti Q45 by lowering the front just 3/4 of an inch.
the pivot point for what you did is the front axle.
while it may 'look' level, you have changed the overall aerodynamics of the body.
just my 2 cents.
Cleaning up the underbelly might help....see the link on my sig
__________________
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
The Following User Says Thank You to mcrews For This Useful Post:
Cobb (03-25-2014)
Old 03-25-2014, 08:27 PM   #4 (permalink)
Hydrogen > EV
 
Join Date: Apr 2012
Location: NW Ohio, United States
Posts: 2,017

Snow White and the 6.2 Dwarfs - '11 Chevrolet Corvette LT2
Last 3: 26.46 mpg (US)

Silver Flea - '05 Honda Insight
90 day: 58.96 mpg (US)
Thanks: 981
Thanked 383 Times in 279 Posts
I am not a scientist.

In my mental wind tunnel, I see this:
-Lower the rear end puts it more into the wind
--Increasing the frontal area
--Changing the angles air normally interacts [with the underbody]
-Changes the angle of the roofline
--Ruining the already damaged airflow

An air dam is the easy way out, but your best bet is to duplicate the stock stance, but as low as acceptable for your life/conditions, and then do an underbody.
__________________





Best Tanks:
Mustang - 54.83 mpg (US) at the Green Grand Prix
Insight - 82.91966 mpg (US) over 818.5 miles.
  Reply With Quote
The Following User Says Thank You to UltArc For This Useful Post:
mcrews (03-26-2014)
Old 03-25-2014, 10:35 PM   #5 (permalink)
Master EcoModder
 
Join Date: May 2012
Location: USA
Posts: 2,643
Thanks: 1,502
Thanked 276 Times in 226 Posts
I returned to the original springs on my honda, but cut a half turn off the fronts. THe front looks the same lowered height as before on tanabe df springs. The rear is noticability higher. I didnt loose the 5 mpg lowering it gave me and I think it even handles better.

I love the fact I can easily throw 800 lbs of mulch, quikcrek, top soil, etc and it doesnt scrap the tow hook on the ground.
  Reply With Quote
Old 03-26-2014, 08:59 AM   #6 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,882

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,403
Thanked 2,901 Times in 1,819 Posts
By possibly exposing the underside to the air flow as the vehicle moves forward could introduce lift - which is drag. The 'attitude' (aka angle of attack) of any vehicle is an important factor to aero drag.
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
The Following User Says Thank You to NeilBlanchard For This Useful Post:
mcrews (03-26-2014)
Old 03-26-2014, 11:40 AM   #7 (permalink)
EV convert
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 9,307

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 224
Thanked 3,038 Times in 2,370 Posts
With my suburban it sits a little nose down, when empty.
Its got old sagging half ton coilsprings up front and much newer 3/4 springs in back.
With the trailer and a load of tools it sits more level.

You want to keep air from getting under the vehicle.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Old 03-26-2014, 12:15 PM   #8 (permalink)
one of thOOOse people
 
Join Date: Mar 2009
Location: the cloud(s)
Posts: 293

twitchy - '98 honda civic dx + sir + ls
90 day: 30.2 mpg (US)

Norman - '14 Ford E-350 EXT
90 day: 15.07 mpg (US)
Thanks: 0
Thanked 81 Times in 66 Posts
I also wonder about the front end alignment changing with the new nose high attitude. You certainly have changed the caster angle a bit and possibly toe in, and camber too.
  Reply With Quote
The Following User Says Thank You to hamsterpower For This Useful Post:
mcrews (03-26-2014)
Old 03-26-2014, 03:32 PM   #9 (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 659 Times in 474 Posts
Quote:
Originally Posted by hamsterpower View Post
I also wonder about the front end alignment changing with the new nose high attitude. You certainly have changed the caster angle a bit and possibly toe in, and camber too.

this is HUGE!!!!!!

lowering the front end 3/4 inch on the Infiniti Q45 chewed up 2 front times!!!!!

(stupid me...should have done an alignment!!!!)

__________________
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
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