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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-11-2019, 07:50 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Mar 2019
Location: Chicago
Posts: 8
Thanks: 0
Thanked 7 Times in 3 Posts
My 40 MPG Corvette is going well but I need help

Hey everyone, my name is Alex and recently I made a video on my YouTube channel on building a 40 MPG C5 Corvette that sacrifices nothing. Before my YouTube career, I was a long-time member here under Sprayed01. I daily drove a Chevy volt for 4 years, and before that I was ecomodding a Saturn SC2. I also just rebuilt a Tesla so I'm into a little bit of everything.

Anyway, if you watched that video I have another coming out this Saturday on how we tuned the car for lean burn. Check out the video but basically I have it running at about a 16.5 afr when just cruising on the highway at 60mph. We tested it on the dyno at a few different afrs and this was the best as far as it feeling totally normal. Too lean and you could tell it was down on power. We also raised the timing.

Here's my question. I want to give mileage results in most of the videos I make on the car since I'm going to be making changes and then testing. I need to figure out the easiest method of calculating mpg after each mod. Now I fully understand the way to go is filling up, driving until it's almost empty and then filling up at the same pump and calculating with the amount of fuel used. The problem is this car will get over 700 miles to a tank so I can't just take a mini road trip after each mod to see if we've made a difference.

Do you have any tips here and how accurate is the mpg display in the cluster? I know it's probably not perfect but what would be a minimum distance I could drive and be able to give a decently accurate result?

Ultimately I will highway cruise it for hundreds of miles on the highway after a few more mods to give everyone a final result but I need something in between.

Thanks, everyone!
Alex

  Reply With Quote
The Following 2 Users Say Thank You to legitstreetcars For This Useful Post:
Ecky (11-12-2019), Xist (11-11-2019)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 11-11-2019, 07:51 PM   #2 (permalink)
EcoModding Lurker
 
Join Date: Mar 2019
Location: Chicago
Posts: 8
Thanks: 0
Thanked 7 Times in 3 Posts
  Reply With Quote
The Following 2 Users Say Thank You to legitstreetcars For This Useful Post:
mikeyjd (11-17-2019), Xist (11-11-2019)
Old 11-11-2019, 09:15 PM   #3 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 3,423

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,331
Thanked 1,472 Times in 938 Posts
OE cluster MPG displays are about as accurate as a presidential hurricane forecast.



Get a ScanGauge or UltraGauge, spend some time getting it calibrated, and then use the short trip measurement to ABA test your mods.
__________________

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
The Following 5 Users Say Thank You to Fat Charlie For This Useful Post:
darcane (11-12-2019), me and my metro (11-11-2019), mikeyjd (11-17-2019), UFO (11-12-2019), Xist (11-11-2019)
Old 11-12-2019, 09:25 AM   #4 (permalink)
EcoModding Apprentice
 
Join Date: Jul 2015
Location: Louisiana
Posts: 127
Thanks: 26
Thanked 38 Times in 30 Posts
Is that a map of the 57 states?
__________________
  Reply With Quote
Old 11-12-2019, 10:45 AM   #5 (permalink)
Master EcoModder
 
teoman's Avatar
 
Join Date: Jan 2017
Location: Istanbul
Posts: 1,079

A3 - '12 Audi A3
Thanks: 54
Thanked 160 Times in 136 Posts
With torque pro you can log to a mobile phone and mail yoursel frselts
  Reply With Quote
Old 11-12-2019, 11:12 AM   #6 (permalink)
EcoModding Lurker
 
Join Date: Mar 2019
Location: Russellville, KY
Posts: 51

Little Blue Fuel Sipper - '16 Nissan Versa SV Sedan
90 day: 47.42 mpg (US)
Thanks: 2
Thanked 9 Times in 7 Posts
As it's already been stated most MPG displays are very optimistic. The one in my Nissan Versa is consistently off by 5-10%. Probably your best bet is to get a Scan Gauge or Ultra Gauge calibrate it as close as possible over a few tanks then start your mods and testing. Even with the calibrations there may be some error but will probably be minimal.
__________________

  Reply With Quote
Old 11-12-2019, 12:16 PM   #7 (permalink)
EcoModding flying lizard
 
Daschicken's Avatar
 
Join Date: May 2012
Location: Georgia
Posts: 686

Cibbie - '88 Honda CBR 250R
Motorcycle
90 day: 54.64 mpg (US)

Rarity - '06 Honda Accord EX V6
Team Honda
90 day: 38.25 mpg (US)

Baby viff - '86 Honda VFR 400R
Motorcycle
90 day: 52 mpg (US)

Latios - '08 Suzuki SV650SF
Motorcycle
90 day: 74.34 mpg (US)
Thanks: 500
Thanked 228 Times in 155 Posts
Scanguage accuracy is limited, given that it assumes a constant AFR. The gauges and access to engine data is nice, but having something that taps into the actual fuel injector pulses like an Ultragauge would be great.

The testing really depends on what kind of mods you are doing. If it is engine related, then you really need an ultragauge or similar for optimal accuracy. If it's aero and tires related, then a coastdown test could give you the data you are looking for.

EDIT: MPGuino, not ultraguage!

My rental sentra had an MPG gauge that varied from 6.8-12% optimistic from the two fillups I did with it.
__________________
-Kaze o tatakaimasen-

Best trip in V6: 52.0
Best tank in V6: 46.0
Best tank in CBR: 61.3
Best tank in VFR: 62.5
Best tank in SV: 83.9

Quote:
Originally Posted by MetroMPG View Post
You can lead a fashion-conscious horse to unusual-looking water...


Last edited by Daschicken; 11-12-2019 at 04:48 PM..
  Reply With Quote
The Following User Says Thank You to Daschicken For This Useful Post:
Fat Charlie (11-12-2019)
Old 11-12-2019, 01:17 PM   #8 (permalink)
EcoModding Apprentice
 
Join Date: Sep 2012
Location: Motor City
Posts: 243
Thanks: 0
Thanked 167 Times in 109 Posts
Quote:
Originally Posted by Daschicken View Post
Scanguage accuracy is limited, given that it assumes a constant AFR. The gauges and access to engine data is nice, but having something that taps into the actual fuel injector pulses like an Ultragauge would be great.
UltraGauge calculates fuel economy the same way the ScanGauge does.

(No idea why they do it this way. Fuel flow data is in the OBD datastream, use it!)
  Reply With Quote
The Following User Says Thank You to ennored For This Useful Post:
Fat Charlie (11-12-2019)
Old 11-12-2019, 03:24 PM   #9 (permalink)
.........................
 
darcane's Avatar
 
Join Date: Aug 2009
Location: Buckley, WA
Posts: 1,583

Ninja 650R - '06 Kawasaki Ninja 650R
90 day: 52.02 mpg (US)

B*tch - '01 Honda Civic HX
Team Honda
90 day: 38.09 mpg (US)

Ms. Hyde - '06 Cadillac CTS V
Sports Cars
90 day: 16.93 mpg (US)
Thanks: 372
Thanked 480 Times in 311 Posts
Welcome Legit,
As you may have noticed, we already found your video and talked about it.

One thing you were wrong on in the video is that Honda has sold numerous cars that legally operate in Lean-Burn mode. I currently have one, a 2001 Civic HX. On this car, the Ultragauge does not properly compute the fuel economy when it is in lean burn mode. I suspect it would be off on your Corvette as well.

I think focusing on some of the hypermiling techniques might get you to your goal. This does nothing to modify your car away from being a performance car, and can basically be turned "on" whenever you want. I used to have a '94 Corvette that I regularly got 29mpg hwy with before I knew anything about hypermiling. With those techniques, I'm sure I could have gotten in the mid/high 30's.

Good luck with your project!
__________________
2001 Civic HX Mods


Past Cars:
CTS-V

2003 Silverado Mods
  Reply With Quote
Old 11-12-2019, 04:48 PM   #10 (permalink)
EcoModding flying lizard
 
Daschicken's Avatar
 
Join Date: May 2012
Location: Georgia
Posts: 686

Cibbie - '88 Honda CBR 250R
Motorcycle
90 day: 54.64 mpg (US)

Rarity - '06 Honda Accord EX V6
Team Honda
90 day: 38.25 mpg (US)

Baby viff - '86 Honda VFR 400R
Motorcycle
90 day: 52 mpg (US)

Latios - '08 Suzuki SV650SF
Motorcycle
90 day: 74.34 mpg (US)
Thanks: 500
Thanked 228 Times in 155 Posts
Quote:
Originally Posted by ennored View Post
UltraGauge calculates fuel economy the same way the ScanGauge does.

(No idea why they do it this way. Fuel flow data is in the OBD datastream, use it!)
I guess I was thinking of the MPGuino, not the ultragauge...

__________________
-Kaze o tatakaimasen-

Best trip in V6: 52.0
Best tank in V6: 46.0
Best tank in CBR: 61.3
Best tank in VFR: 62.5
Best tank in SV: 83.9

Quote:
Originally Posted by MetroMPG View Post
You can lead a fashion-conscious horse to unusual-looking water...

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com