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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-16-2012, 07:29 PM   #11 (permalink)
EcoMod Proof of Concept
 
WD40's Avatar
 
Join Date: Mar 2008
Location: Chilliwack B.C. CANADA
Posts: 243

WD-40's Insight - '00 Honda Insight
Gen-1 Insights
Team Honda
90 day: 56.04 mpg (US)

WD-40's Mirage - '15 Mitsubushi Mirage ES
Mitsubishi
90 day: 46.05 mpg (US)
Thanks: 80
Thanked 84 Times in 44 Posts
With the $ saved on gas, you can laugh all the way to the bank.

__________________
2000 Insight MT 106K Citrus A/C
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-16-2012, 11:54 PM   #12 (permalink)
Master EcoModder
 
Join Date: Oct 2009
Location: Midwest
Posts: 337
Thanks: 4
Thanked 37 Times in 21 Posts
Well i just put on my new muffler, first impressions are that its quiet, might get better mpg in town, but lost power on the highway.

I've noticed I can press the gas pedal down a lot farther now, but on first impression it seems to lose speed faster I gotta drive 40 miles on wednesday, i'll try to compare previous trips to this new one.
  Reply With Quote
Old 04-17-2012, 12:14 AM   #13 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,128

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,316
Thanked 2,054 Times in 1,398 Posts
Quote:
Originally Posted by aerohead View Post
I believe that at the time the VX came to market,that the National 55 MPH speed limit was still in force.The VX would have been calibrated for this speed for the Federal Test Procedures at EPA Mobile Sources in order to optimize the EPA HWY rating.
By operating the car at 65 mph,your asking it to perform in an environment that it was not optimized for.
Speed limits began to go up from 55 in 1987 or 1986, five or six years before the VX engine.

Quote:
Originally Posted by aerohead View Post
You may want to follow basjoo's lead with the aero.You'll get your lean-burn for sure!
Maybe the lean burn engine was designed with the better aero and taller gearing of the HF in mind?
__________________
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



  Reply With Quote
Old 04-17-2012, 01:02 AM   #14 (permalink)
Master EcoModder
 
Join Date: Oct 2009
Location: Midwest
Posts: 337
Thanks: 4
Thanked 37 Times in 21 Posts
Quote:
Originally Posted by California98Civic View Post
Speed limits began to go up from 55 in 1987 or 1986, five or six years before the VX engine.



Maybe the lean burn engine was designed with the better aero and taller gearing of the HF in mind?
Didn't the crxmpg.com guy (forgot his name on here) get really good gas mileage with his HF gearing in his CRX? If I recall he had dx gearing to begin with and then swapped in the HF final drive and said it was awesome.
  Reply With Quote
Old 04-17-2012, 10:27 AM   #15 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,071

Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 55.14 mpg (US)

Camryglide - '20 Toyota Camry hybrid LE
90 day: 60.53 mpg (US)
Thanks: 11
Thanked 627 Times in 287 Posts
Quote:
Originally Posted by steffen707 View Post
Of course aerocivic mods would help a ton, but I'm not sure i'm ready for all the laughs.
I've had people ask if my car was a hybrid, an EV, and an amphibious car, but I haven't heard any laughs so far.

The aero mods have produced well over $5 grand in fuel savings so far over in close to 190,000 miles of driving, saved my car from being totalled and me from injury when I was rear ended by a speeder and prevented major front end damage in two deer collisions. Plus no dead bugs to clean off the front of the car and the car's body remains mostly clean of dirt and salt spray.
__________________
aerocivic.com
  Reply With Quote
The Following User Says Thank You to basjoos For This Useful Post:
aerohead (04-19-2012)
Old 04-17-2012, 10:38 AM   #16 (permalink)
Master EcoModder
 
Join Date: Oct 2009
Location: Midwest
Posts: 337
Thanks: 4
Thanked 37 Times in 21 Posts
Quote:
Originally Posted by basjoos View Post
I've had people ask if my car was a hybrid, an EV, and an amphibious car, but I haven't heard any laughs so far.

The aero mods have produced well over $5 grand in fuel savings so far over in close to 190,000 miles of driving, saved my car from being totalled and me from injury when I was rear ended by a speeder and prevented major front end damage in two deer collisions. Plus no dead bugs to clean off the front of the car and the car's body remains mostly clean of dirt and salt spray.
That's quite a bit of savings. I don't drive a ton though. Maybe 7,000 miles a year, so i'm just trying to figure out my best course.

Thanks for chiming in though, I loved that deer getting hit by the race car video you posted. Pretty amazing.
  Reply With Quote
Old 04-17-2012, 06:40 PM   #17 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,611
Thanks: 20,273
Thanked 6,281 Times in 3,888 Posts
55

Quote:
Originally Posted by California98Civic View Post
Speed limits began to go up from 55 in 1987 or 1986, five or six years before the VX engine.



Maybe the lean burn engine was designed with the better aero and taller gearing of the HF in mind?
Thanks California for the chronology!
I guess my second thought is that the FTP for EPA HWY cycle would still have been run with the max. 60 mph velocity,and average 48.6 mph on the dyno,so regardless of posted speed limits,the EPA HWY MPG would still reflect the lower speed testing.
My friends the Gilkisons had a VX which we tested at 55 mph on a camping trip beyond the Very Large Array,on to Datil Wells State Park,New Mexico and around Silver City,back into the Las Cruces area.I think we broke 60 mpg.
Nowadays,they have dynos which can withstand 0-60 in 7-seconds without slippage and speeds to 80 mph.
  Reply With Quote
Old 04-19-2012, 10:50 AM   #18 (permalink)
Master EcoModder
 
Join Date: Oct 2009
Location: Midwest
Posts: 337
Thanks: 4
Thanked 37 Times in 21 Posts
I've been playing with that aerodynamic calculator and comparing my cars CDA of 7.62 to the vx CDA of 6.16. It shows 14.83hp needed to keep the car at 65mph in a VX and 17.96hp needed in my car.

Do you guys think I will see a large improvement switching chassis to a 92-95cx/vx hatch?

I know guys are talking about putting electric motors on their engines to give a few HP boost, and if this calculator is close to accurate, I have to think I should see a huge improvement in my car wanting to stay in lean burn(making enough power to overcome the drag). I think i calculated that yesterday and it was a 20% reduction in power needed.

I know people have said just aero mod your car to achieve the same results, but it would be easier for me to swap I think.
  Reply With Quote
Old 04-19-2012, 05:55 PM   #19 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,611
Thanks: 20,273
Thanked 6,281 Times in 3,888 Posts
mods

Quote:
Originally Posted by steffen707 View Post
I've been playing with that aerodynamic calculator and comparing my cars CDA of 7.62 to the vx CDA of 6.16. It shows 14.83hp needed to keep the car at 65mph in a VX and 17.96hp needed in my car.

Do you guys think I will see a large improvement switching chassis to a 92-95cx/vx hatch?

I know guys are talking about putting electric motors on their engines to give a few HP boost, and if this calculator is close to accurate, I have to think I should see a huge improvement in my car wanting to stay in lean burn(making enough power to overcome the drag). I think i calculated that yesterday and it was a 20% reduction in power needed.

I know people have said just aero mod your car to achieve the same results, but it would be easier for me to swap I think.
If you do the aero mods you'll be practicing load avoidance which is the most elegant form of engineering.
It would be like adding insulation R-Factor to your home.You're reducing its inverse,the heat transfer 'coefficient,' and with the same indoor/outdoor temps,you can be just as comfortable with less heating or cooling.
If you consider adding S-Factor to the car,then its inverse,the drag 'coefficient' is reduced,and you can operate at the same speed on less.
This efficiency will be built in to the car and it can't ever go out of tune,nor ever require replacement parts.
My CRX is at CdA 0.404 sq meters with the kit.You could easily match it with what you have.
  Reply With Quote
Old 04-20-2012, 10:26 AM   #20 (permalink)
Master EcoModder
 
basjoos's Avatar
 
Join Date: Dec 2007
Location: Upstate SC
Posts: 1,071

Aerocivic - '92 Honda Civic CX
Last 3: 70.54 mpg (US)

AerocivicLB - '92 Honda Civic CX
Team Honda
90 day: 55.14 mpg (US)

Camryglide - '20 Toyota Camry hybrid LE
90 day: 60.53 mpg (US)
Thanks: 11
Thanked 627 Times in 287 Posts
Any aero mod that allows you to go faster on the same horsepower will give you better fuel efficiency at normal speeds.

__________________
aerocivic.com
  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